Pub Date : 2023-12-04DOI: 10.1080/17486025.2023.2288926
Javad Sadoghi Yazdi, R. Moss
{"title":"Numerical investigation on design of soil nailed slopes by limit equilibrium method","authors":"Javad Sadoghi Yazdi, R. Moss","doi":"10.1080/17486025.2023.2288926","DOIUrl":"https://doi.org/10.1080/17486025.2023.2288926","url":null,"abstract":"","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138603065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.1080/17486025.2023.2288655
D. Subramaniam, Mohan Sajeevan, Jeyananthan Pratheeba, Sathushka Heshan Bandara Wijekoon, N. Sathiparan
{"title":"Characterization of the shape of aggregates using image analysis and machine learning classification tools","authors":"D. Subramaniam, Mohan Sajeevan, Jeyananthan Pratheeba, Sathushka Heshan Bandara Wijekoon, N. Sathiparan","doi":"10.1080/17486025.2023.2288655","DOIUrl":"https://doi.org/10.1080/17486025.2023.2288655","url":null,"abstract":"","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"23 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.1080/17486025.2023.2288158
Tohid Shiri, Roohollah Farzalizadeh, Hadi Bahadori
{"title":"Physical modelling of the seismic response of well casings in liquefiable soil","authors":"Tohid Shiri, Roohollah Farzalizadeh, Hadi Bahadori","doi":"10.1080/17486025.2023.2288158","DOIUrl":"https://doi.org/10.1080/17486025.2023.2288158","url":null,"abstract":"","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"12 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138603626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-11DOI: 10.1080/17486025.2023.2261415
Watthana Makararotrit, Sompote Youwai
ABSTRACTThis paper presents an appropriate physical parameter for cement admixed clay, termed as the state parameter that combines the influence of void ratio, stress level, and cement content reference to an ultimate (steady) state. Data from a triaxial testing program on Pasak Clay with different stress paths was presented and demonstrated to be dependent on the state parameter. The strength and pore water pressure at the failure of cement mixed clay were directly associated with mean stress and decreasing state parameters. The 3-D surface for deviatoric stress, mean stress, and state parameter at certain distortional strains was proposed based on a stress path triaxial test. The stiffness of cement-treated clay increased with a decreasing state parameter and increase in mean stress. The concept of state parameter is a basic physical concept and has broad application as an empirical normalising parameter and constitutive modelling of soil behaviour.KEYWORDS: Cement admixed clayState parameterTriaxial testStiffness Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the Department of Civil Engineering, King Mongkut's University of Technology Thonburi (CE-KMUTT-6608).
{"title":"A state parameter of cement admixed clay with different stress paths","authors":"Watthana Makararotrit, Sompote Youwai","doi":"10.1080/17486025.2023.2261415","DOIUrl":"https://doi.org/10.1080/17486025.2023.2261415","url":null,"abstract":"ABSTRACTThis paper presents an appropriate physical parameter for cement admixed clay, termed as the state parameter that combines the influence of void ratio, stress level, and cement content reference to an ultimate (steady) state. Data from a triaxial testing program on Pasak Clay with different stress paths was presented and demonstrated to be dependent on the state parameter. The strength and pore water pressure at the failure of cement mixed clay were directly associated with mean stress and decreasing state parameters. The 3-D surface for deviatoric stress, mean stress, and state parameter at certain distortional strains was proposed based on a stress path triaxial test. The stiffness of cement-treated clay increased with a decreasing state parameter and increase in mean stress. The concept of state parameter is a basic physical concept and has broad application as an empirical normalising parameter and constitutive modelling of soil behaviour.KEYWORDS: Cement admixed clayState parameterTriaxial testStiffness Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the Department of Civil Engineering, King Mongkut's University of Technology Thonburi (CE-KMUTT-6608).","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136211341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-04DOI: 10.1080/17486025.2023.2258833
Hanie Abbaslou, Francisco Jose Martin Peinado, Ali Reza Ghanizadeh, Meysam Shahrashoub
ABSTRACTSepiolite is a fibrous clay mineral, which is mostly associated with a semi-arid to arid climate, with characteristics intermediate between kaolinite and montmorillonite minerals. An experimental study was conducted, with the goal of creating a substantial database of physical, microstructural, and geotechnical characteristics of sepiolite to develop its applications as a natural resource that is explored as the main deposit of Iran. It has been found that sepiolite soils were lightweight, porous, and cohesive with negligible settlement and swelling properties and almost high UCS values. Various analysis were performed to characterise the macroscopic behaviour (Atterberg limit, physical, and compressibility tests), microstructural, chemical, and mineralogical characterisations by chemical analysis, X-Ray diffraction, and Scanning Electron Microscopy. At first glance, sepiolite soils showed high liquid limits with medium to high plastic indices which can result in problems including creation of up and down movements in foundations. After mixing with silt and fine sand to decrease high liquid limit and optimum moisture amounts, sepiolite is suitable candidate for engineering applications (including clay liners, clay cores, etc.) due to its compressibility and strength characteristics. In conclusion, sepiolite soils are strongly recommended for geo-environmental structures due to their adsorption capacity, low permeability coefficient, and suitable strengths.KEYWORDS: clay soilsepioliteIranian sepiolitemechanical propertiesengineering applications AcknowledgmentsThis research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
{"title":"Properties of sepiolite clay soil as a natural material (Iran’s sources clay)","authors":"Hanie Abbaslou, Francisco Jose Martin Peinado, Ali Reza Ghanizadeh, Meysam Shahrashoub","doi":"10.1080/17486025.2023.2258833","DOIUrl":"https://doi.org/10.1080/17486025.2023.2258833","url":null,"abstract":"ABSTRACTSepiolite is a fibrous clay mineral, which is mostly associated with a semi-arid to arid climate, with characteristics intermediate between kaolinite and montmorillonite minerals. An experimental study was conducted, with the goal of creating a substantial database of physical, microstructural, and geotechnical characteristics of sepiolite to develop its applications as a natural resource that is explored as the main deposit of Iran. It has been found that sepiolite soils were lightweight, porous, and cohesive with negligible settlement and swelling properties and almost high UCS values. Various analysis were performed to characterise the macroscopic behaviour (Atterberg limit, physical, and compressibility tests), microstructural, chemical, and mineralogical characterisations by chemical analysis, X-Ray diffraction, and Scanning Electron Microscopy. At first glance, sepiolite soils showed high liquid limits with medium to high plastic indices which can result in problems including creation of up and down movements in foundations. After mixing with silt and fine sand to decrease high liquid limit and optimum moisture amounts, sepiolite is suitable candidate for engineering applications (including clay liners, clay cores, etc.) due to its compressibility and strength characteristics. In conclusion, sepiolite soils are strongly recommended for geo-environmental structures due to their adsorption capacity, low permeability coefficient, and suitable strengths.KEYWORDS: clay soilsepioliteIranian sepiolitemechanical propertiesengineering applications AcknowledgmentsThis research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135591320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-14DOI: 10.1080/17486025.2023.2257630
Abdorrahman Kaboudani, Mohsen Ajdari, Shahrzad Maleki, Zahra Esfandiari, Ali Shafiee
ABSTRACTThis study is mainly aimed at exploring effects of the aging-induced chemical decomposition of Municipal Solid Waste (MSW) on the shear response and physical properties of locally available MSW of Fars province, Iran, at its in-situ condition. To this end, a large direct shear device (1×1×1.1 m3) is designed, fabricated and employed to evaluate the parameters of the failure envelop at plane strain condition representing slopes of engineered landfills. Bulk disturbed samples of fresh MSW are exhumed from an operational disposal site to be implemented into the study and subsequently remolded in the large-scale shear box. Four drained shear tests are performed under a variety of vertical stresses. Next, intact components of MSW are landfilled over a period of 3, 6, and 9 months. Similar shear experiments are conducted at the end of each mentioned time interval. Mechanical behavior of MSW is completely frictional and internal friction angle of the studied MSW non-linearly increases with time from 44.2º to 55.7º. The stress-strain response is almost bilinear over a wide range of displacement. The decomposition process is further clarified in light of results of pH tests conducted on the leachate of the MSW at the end of various landfilling time intervals.KEYWORD: Municipal solid wastelarge direct shear deviceageingshear strength Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementAll data, models, and code generated or used during the study appear in the submitted article.
{"title":"Roles of ageing on the physical, chemical and mechanical parameters of a prototype municipal solid waste","authors":"Abdorrahman Kaboudani, Mohsen Ajdari, Shahrzad Maleki, Zahra Esfandiari, Ali Shafiee","doi":"10.1080/17486025.2023.2257630","DOIUrl":"https://doi.org/10.1080/17486025.2023.2257630","url":null,"abstract":"ABSTRACTThis study is mainly aimed at exploring effects of the aging-induced chemical decomposition of Municipal Solid Waste (MSW) on the shear response and physical properties of locally available MSW of Fars province, Iran, at its in-situ condition. To this end, a large direct shear device (1×1×1.1 m3) is designed, fabricated and employed to evaluate the parameters of the failure envelop at plane strain condition representing slopes of engineered landfills. Bulk disturbed samples of fresh MSW are exhumed from an operational disposal site to be implemented into the study and subsequently remolded in the large-scale shear box. Four drained shear tests are performed under a variety of vertical stresses. Next, intact components of MSW are landfilled over a period of 3, 6, and 9 months. Similar shear experiments are conducted at the end of each mentioned time interval. Mechanical behavior of MSW is completely frictional and internal friction angle of the studied MSW non-linearly increases with time from 44.2º to 55.7º. The stress-strain response is almost bilinear over a wide range of displacement. The decomposition process is further clarified in light of results of pH tests conducted on the leachate of the MSW at the end of various landfilling time intervals.KEYWORD: Municipal solid wastelarge direct shear deviceageingshear strength Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementAll data, models, and code generated or used during the study appear in the submitted article.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134910957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-09DOI: 10.1080/17486025.2023.2256301
Adel Ahmadihosseini, Ali Pak, Mohammad Reza Bannae Sharifian, Ferri Hassani
During the last two decades, energy production has been directed towards renewable resources, one of the most important of which is geothermal energy. Despite the reliability of geothermal energy as a resource, its effects on the surrounding environment have not been investigated in detail. This study focuses on reservoir deformation as one of the environmental concerns of geothermal energy extraction. A coupled thermo-hydro-mechanical (THM) model is employed for simulating the reservoir deformations. The validity of the model results is examined by comparing the numerical results with the analytical solution of a benchmark THM problem. The model is then utilised to study the behaviour of a Hot Dry Rock reservoir consisting of two wells. The obtained results show that in some cases the reservoir deformation is significant, making it an important factor in design considerations. Also, it is found that the deformation caused by thermal volume change is up to 6 times more significant compared to that of poroelastic effects. The conducted parametric study demonstrated that the coefficient of thermal expansion of rock and the production rate severely influence the reservoir deformation, while rock elasticity modulus, porosity and Biot-Willis coefficient only affect the behaviour of the geothermal reservoir to some extent.
{"title":"Numerical study on the effects of thermoelastic and poroelastic parameters on the geomechanical behaviour of Hot Dry Rock geothermal reservoirs","authors":"Adel Ahmadihosseini, Ali Pak, Mohammad Reza Bannae Sharifian, Ferri Hassani","doi":"10.1080/17486025.2023.2256301","DOIUrl":"https://doi.org/10.1080/17486025.2023.2256301","url":null,"abstract":"During the last two decades, energy production has been directed towards renewable resources, one of the most important of which is geothermal energy. Despite the reliability of geothermal energy as a resource, its effects on the surrounding environment have not been investigated in detail. This study focuses on reservoir deformation as one of the environmental concerns of geothermal energy extraction. A coupled thermo-hydro-mechanical (THM) model is employed for simulating the reservoir deformations. The validity of the model results is examined by comparing the numerical results with the analytical solution of a benchmark THM problem. The model is then utilised to study the behaviour of a Hot Dry Rock reservoir consisting of two wells. The obtained results show that in some cases the reservoir deformation is significant, making it an important factor in design considerations. Also, it is found that the deformation caused by thermal volume change is up to 6 times more significant compared to that of poroelastic effects. The conducted parametric study demonstrated that the coefficient of thermal expansion of rock and the production rate severely influence the reservoir deformation, while rock elasticity modulus, porosity and Biot-Willis coefficient only affect the behaviour of the geothermal reservoir to some extent.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136192693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-05DOI: 10.20535/2707-2096.7.2022.267599
O. Trofymova, S. Felonenko, Viktoriia Hubkina
Purpose and task is making research on the dynamics of a vibrating installation to process tubular materials and the kinematics of their movement (circulation) in hemispherical chambers. Methodology. To achieve the target goal, an expert assessment of existing approaches to methods of processing bulk and rod materials in air and liquid environments has been carried out. Research methods. Using vibrations for heat treatment of bulk and tubular materials makes it possible to intensify the heat exchange process, significantly reduce processing time, save fuel and electricity consumption, improve product quality, reduce costs on maintenance and environmental protection. The materials of theoretical studies on vibrating machine dynamics under different types of working body oscillations and the number of vibration drives are presented. Analytical dependences of vibration parameters have been obtained. The main results. Using vibrations to develop highly reliable and efficient technological units incorporating the performance of low technological operations in one device. Conclusions and practical significance. Based on the analysis of vibrating machines with a liquid environment, the results of research aimed at improving technologies and appropriate technical means to process bulk, lump and rod materials in air and liquid environments are provided. The solution of linear differential equations resulted in obtaining amplitude parameters of steady oscillations of an installation working body with relevance to the movement of working camera points and the installation angular oscillations as well. It has been proved that the amplitude of the vertical oscillations of the point is equal to the amplitude of the circular oscillations of the installation gravity center. Obtained rational trajectories of installation point oscillations to determine rational parameters are based on the requirements of material processing technology. The developed calculation methods can be used while studying machine dynamics of other types of a similar class containing liquid in the working space. Installation design makes it possible to adjust the oscillation amplitude and the nature of the trajectory of the installation working body points within wide limits. Keywords: rod or bulk material, motion kinematics, processing, vibrating machines, vibration trajectories, liquid, or air environment.
{"title":"PROCESSING OF BULK AND ROD MATERIALS IN COMBINED VESSELS","authors":"O. Trofymova, S. Felonenko, Viktoriia Hubkina","doi":"10.20535/2707-2096.7.2022.267599","DOIUrl":"https://doi.org/10.20535/2707-2096.7.2022.267599","url":null,"abstract":"Purpose and task is making research on the dynamics of a vibrating installation to process tubular materials and the kinematics of their movement (circulation) in hemispherical chambers. \u0000Methodology. To achieve the target goal, an expert assessment of existing approaches to methods of processing bulk and rod materials in air and liquid environments has been carried out. \u0000Research methods. Using vibrations for heat treatment of bulk and tubular materials makes it possible to intensify the heat exchange process, significantly reduce processing time, save fuel and electricity consumption, improve product quality, reduce costs on maintenance and environmental protection. The materials of theoretical studies on vibrating machine dynamics under different types of working body oscillations and the number of vibration drives are presented. Analytical dependences of vibration parameters have been obtained. \u0000The main results. Using vibrations to develop highly reliable and efficient technological units incorporating the performance of low technological operations in one device. \u0000Conclusions and practical significance. Based on the analysis of vibrating machines with a liquid environment, the results of research aimed at improving technologies and appropriate technical means to process bulk, lump and rod materials in air and liquid environments are provided. The solution of linear differential equations resulted in obtaining amplitude parameters of steady oscillations of an installation working body with relevance to the movement of working camera points and the installation angular oscillations as well. It has been proved that the amplitude of the vertical oscillations of the point is equal to the amplitude of the circular oscillations of the installation gravity center. Obtained rational trajectories of installation point oscillations to determine rational parameters are based on the requirements of material processing technology. The developed calculation methods can be used while studying machine dynamics of other types of a similar class containing liquid in the working space. Installation design makes it possible to adjust the oscillation amplitude and the nature of the trajectory of the installation working body points within wide limits. \u0000Keywords: rod or bulk material, motion kinematics, processing, vibrating machines, vibration trajectories, liquid, or air environment.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89077989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-05DOI: 10.20535/2707-2096.7.2022.252758
O. Frolov, I. Lytvynchuk
Purpose and task. The aim of the research is to substantiate the expediency and efficiency of using a bulldozer-excavator-automobile complex with the use of ripper bulldozers to remove the overburden layer of fluvioglacial deposits in the conditions of the Sosnivsky granite deposit. To achieve this goal, it is necessary to: establish the patterns of distribution and features of fluvioglacial deposits; to analyze possible technological schemes of development of gravel and sand deposits; justify the need and effectiveness of the technological complex of equipment for the removal of fluvioglacial deposits in the quarry; to establish the dependence of the variable productivity of the excavator on the average size of the piece of rock. Research methods. An integrated approach was used to solve the set tasks: analysis and generalization of previous research on the peculiarities of fluvioglacial deposits and the possibility of using equipment complexes for the development of gravel and sand mountains; technological substantiation of the offered engineering and scientific decisions; analytical calculation of variable productivity of the excavator depending on the average size of a piece of rock. Scientific novelty. The possibility of using a bulldozer-excavator-automobile complex of equipment for removing the overburden layer of fluvioglacial deposits in rock quarries has been substantiated. The analytical dependence of the change in excavator productivity on the average piece size of fluvioglacial deposits is obtained. Conclusions and practical significance. It is established that when the average size of gravel-sand material changes from 20 to 200 mm, the productivity of the excavator decreases by 1,59 times. It is proved that the productivity of the excavator type "straight shovel" is 17% higher than the productivity of the backhoe excavator. For the conditions of the Sosnivsky granite deposit quarry, where the weighted average size of a piece of fluvioglacial sediment is 171 mm, the variable productivity of the excavator is: according to the first technological scheme (hydraulic backhoe excavator placed on the roof of the sediment) – 474,1 m3/shift; according to the second technological scheme (excavator "straight shovel" is located on the lower production horizon) – 553,1 m3/shift. Keywords: fluvioglacial deposits, quarry, technological schemes, equipment complex, excavator productivity, gravel-sand rocks.
{"title":"SUBSTANTIATION OF BULLDOZER-EXCAVATOR-AUTOMOBILE COMPLEX FOR REMOVAL OF OVERBURDEN LAYER OF FLUVIOGLACIAL DEPOSITS IN THE CONDITIONS OF SOSNIVSKY GRANITE DEPOSIT","authors":"O. Frolov, I. Lytvynchuk","doi":"10.20535/2707-2096.7.2022.252758","DOIUrl":"https://doi.org/10.20535/2707-2096.7.2022.252758","url":null,"abstract":"Purpose and task. The aim of the research is to substantiate the expediency and efficiency of using a bulldozer-excavator-automobile complex with the use of ripper bulldozers to remove the overburden layer of fluvioglacial deposits in the conditions of the Sosnivsky granite deposit. To achieve this goal, it is necessary to: establish the patterns of distribution and features of fluvioglacial deposits; to analyze possible technological schemes of development of gravel and sand deposits; justify the need and effectiveness of the technological complex of equipment for the removal of fluvioglacial deposits in the quarry; to establish the dependence of the variable productivity of the excavator on the average size of the piece of rock.\u0000Research methods. An integrated approach was used to solve the set tasks: analysis and generalization of previous research on the peculiarities of fluvioglacial deposits and the possibility of using equipment complexes for the development of gravel and sand mountains; technological substantiation of the offered engineering and scientific decisions; analytical calculation of variable productivity of the excavator depending on the average size of a piece of rock.\u0000Scientific novelty. The possibility of using a bulldozer-excavator-automobile complex of equipment for removing the overburden layer of fluvioglacial deposits in rock quarries has been substantiated. The analytical dependence of the change in excavator productivity on the average piece size of fluvioglacial deposits is obtained.\u0000Conclusions and practical significance. It is established that when the average size of gravel-sand material changes from 20 to 200 mm, the productivity of the excavator decreases by 1,59 times. It is proved that the productivity of the excavator type \"straight shovel\" is 17% higher than the productivity of the backhoe excavator. For the conditions of the Sosnivsky granite deposit quarry, where the weighted average size of a piece of fluvioglacial sediment is 171 mm, the variable productivity of the excavator is: according to the first technological scheme (hydraulic backhoe excavator placed on the roof of the sediment) – 474,1 m3/shift; according to the second technological scheme (excavator \"straight shovel\" is located on the lower production horizon) – 553,1 m3/shift.\u0000Keywords: fluvioglacial deposits, quarry, technological schemes, equipment complex, excavator productivity, gravel-sand rocks.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78215289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-05DOI: 10.20535/2707-2096.7.2022.267610
S. Zaichenko, O. Seminskyi, N. Zhukova, D. Derevianko, V. Shalenko
The purpose. Study of the physical and mechanical processes that accompany the operational cycle of conveyor rollers with the aim of establishing the main factors that affect the resource and justifying the design of the seal to ensure the maximum period of operation and production costs. Methodology. To achieve the goal, the regularities of the main processes accompanying the operational cycle of the conveyor roller, thermal expansion and cooling of the roller space - "breathing", heating of the roller from atmospheric effects, friction of the roller on the conveyor belt and in the bearings, have been established; a model of thermodynamic equilibrium of roller elements was created, which combines the main processes accompanying the operational cycle; uniform recommendations have been created that will allow to ensure the maximum period of operation and production costs of conveyor rollers. Findings. According to the results of analytical studies of the main processes accompanying the operational cycle of the conveyor roller, thermal expansion and cooling of the roller space, significant heating of the roller space to 40ºС was established. The heating of the roller leads to a number of negative phenomena, among which it is possible to separate heating of the lubricant with loss of rheological properties, heating of seals with loss of tightness, heating of bearings to temperatures close to critical (90ºС). A change in the average temperature of the roller can lead to a significant change in pressure (14600 Pa) under conditions of complete tightness. None of the known seals that are used for conveyor rollers can withstand this sign-changing pressure drop. For labyrinth seals, when heated, the pressure is completely equalized to the atmospheric level, which creates a "breathing" effect. In the process of "breathing" a certain amount of water condenses from moist air, which can completely destroy any structure of the conveyor roller through electrochemical corrosion. The impossibility of sealing the space of the conveyor roller with known structures of labyrinth seals has been proven, which requires the development of new technical solutions for modernization. Originality. A model of the thermodynamic equilibrium of roller elements has been created, which will combine the main processes accompanying the operational cycle. Which shows the linear dependence of the heating temperature change on the load, the rolling resistance of the bearing and the roller bearing. Practical implications. The solution that will minimize the process of “breathing” of the roller is to isolate the space of seals and bearings from the inner space of the roller. To implement this solution, it is necessary to add an additional row of seals to each bearing on the opposite side from the outer one. Also, to reduce the effect of "breathing" of the roller due to sealing, it is appropriate to depressurize the space of the roller. Keywords: conveyor, labyrinth seals, heating, r
{"title":"SPECIFICS OF DIAGNOSTICS OF TECHNICAL CONDITION OF TRANSPORT AND TECHNOLOGICAL SYSTEM “MINING GAS PIPELINE – MINE WORKING”","authors":"S. Zaichenko, O. Seminskyi, N. Zhukova, D. Derevianko, V. Shalenko","doi":"10.20535/2707-2096.7.2022.267610","DOIUrl":"https://doi.org/10.20535/2707-2096.7.2022.267610","url":null,"abstract":"The purpose. Study of the physical and mechanical processes that accompany the operational cycle of conveyor rollers with the aim of establishing the main factors that affect the resource and justifying the design of the seal to ensure the maximum period of operation and production costs. \u0000Methodology. To achieve the goal, the regularities of the main processes accompanying the operational cycle of the conveyor roller, thermal expansion and cooling of the roller space - \"breathing\", heating of the roller from atmospheric effects, friction of the roller on the conveyor belt and in the bearings, have been established; a model of thermodynamic equilibrium of roller elements was created, which combines the main processes accompanying the operational cycle; uniform recommendations have been created that will allow to ensure the maximum period of operation and production costs of conveyor rollers. \u0000Findings. According to the results of analytical studies of the main processes accompanying the operational cycle of the conveyor roller, thermal expansion and cooling of the roller space, significant heating of the roller space to 40ºС was established. The heating of the roller leads to a number of negative phenomena, among which it is possible to separate heating of the lubricant with loss of rheological properties, heating of seals with loss of tightness, heating of bearings to temperatures close to critical (90ºС). A change in the average temperature of the roller can lead to a significant change in pressure (14600 Pa) under conditions of complete tightness. None of the known seals that are used for conveyor rollers can withstand this sign-changing pressure drop. For labyrinth seals, when heated, the pressure is completely equalized to the atmospheric level, which creates a \"breathing\" effect. In the process of \"breathing\" a certain amount of water condenses from moist air, which can completely destroy any structure of the conveyor roller through electrochemical corrosion. The impossibility of sealing the space of the conveyor roller with known structures of labyrinth seals has been proven, which requires the development of new technical solutions for modernization. \u0000Originality. A model of the thermodynamic equilibrium of roller elements has been created, which will combine the main processes accompanying the operational cycle. Which shows the linear dependence of the heating temperature change on the load, the rolling resistance of the bearing and the roller bearing. \u0000Practical implications. The solution that will minimize the process of “breathing” of the roller is to isolate the space of seals and bearings from the inner space of the roller. To implement this solution, it is necessary to add an additional row of seals to each bearing on the opposite side from the outer one. Also, to reduce the effect of \"breathing\" of the roller due to sealing, it is appropriate to depressurize the space of the roller. \u0000Keywords: conveyor, labyrinth seals, heating, r","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86157093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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