Pub Date : 2020-08-27DOI: 10.20535/2707-2096.2.2020.207377
Олег Григорович Левченко, Анна Олегівна Лук’яненко, Юрій Олексійович Полукаров
Purpose. Determination of possibilities of influence of process of arc welding with controlled impulse supply of powder electrode wire on hygienic characteristics of process of welding and choice of welding modes, providing reduction of secretions of harmful substances. Methodology. Investigate the dependence of the indicators of the levels of emissions of harmful substances of the welding aerosol from the welding mode to select the optimal parameters on the example of welding with controlled pulse feed. The key studied parameter was the intensity of welding aerosol release. The research was carried out by the method of "complete capture", based on the principle of filtering the entire volume of air sucked from the shelter on the FPP filter installed on the road. Findings. The advantages and possibilities of reducing emissions of harmful substances into the air of the working area due to the use of welding with pulsed wire feed and the choice of appropriate parameters of welding modes are shown. It is established that the intensity of welding aerosol formation, the number of main components and their mass fraction in the composition of the welding aerosol are sensitive to voltage changes within ± 1.5-2 V, which occurs under the condition of pulsed electrode wire supply. Originality. Hygienically justified use of welding modes with controlled pulse feed of the electrode wire. Practical implications. Mechanized welding with controlled pulse feed of flux-cored wire makes it possible to improve the hygienic characteristics of this process in comparison with welding with continuous wire feed and to some extent to control them. The obtained research results are recommended to be used to improve the working conditions of welders by selecting appropriate welding modes with controlled pulse supply of flux-cored wire. Such optimization of the welder's working conditions can be achieved by fine-tuning the parameters of the pulse supply of the electrode wire and the correct selection of welding materials.
{"title":"Hygienic characteristics of mechanized arc welding with pulse flux-cored wire feeding","authors":"Олег Григорович Левченко, Анна Олегівна Лук’яненко, Юрій Олексійович Полукаров","doi":"10.20535/2707-2096.2.2020.207377","DOIUrl":"https://doi.org/10.20535/2707-2096.2.2020.207377","url":null,"abstract":"Purpose. Determination of possibilities of influence of process of arc welding with controlled impulse supply of powder electrode wire on hygienic characteristics of process of welding and choice of welding modes, providing reduction of secretions of harmful substances. Methodology. Investigate the dependence of the indicators of the levels of emissions of harmful substances of the welding aerosol from the welding mode to select the optimal parameters on the example of welding with controlled pulse feed. The key studied parameter was the intensity of welding aerosol release. The research was carried out by the method of \"complete capture\", based on the principle of filtering the entire volume of air sucked from the shelter on the FPP filter installed on the road. Findings. The advantages and possibilities of reducing emissions of harmful substances into the air of the working area due to the use of welding with pulsed wire feed and the choice of appropriate parameters of welding modes are shown. It is established that the intensity of welding aerosol formation, the number of main components and their mass fraction in the composition of the welding aerosol are sensitive to voltage changes within ± 1.5-2 V, which occurs under the condition of pulsed electrode wire supply. Originality. Hygienically justified use of welding modes with controlled pulse feed of the electrode wire. Practical implications. Mechanized welding with controlled pulse feed of flux-cored wire makes it possible to improve the hygienic characteristics of this process in comparison with welding with continuous wire feed and to some extent to control them. The obtained research results are recommended to be used to improve the working conditions of welders by selecting appropriate welding modes with controlled pulse supply of flux-cored wire. Such optimization of the welder's working conditions can be achieved by fine-tuning the parameters of the pulse supply of the electrode wire and the correct selection of welding materials.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80826323","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 : 2020-08-27DOI: 10.20535/2707-2096.2.2020.207374
Геннадій Іванович Гайко, Іван Олександрович Матвійчук, Олена Степанівна Тарасюк
Purpose. Investigation of the influence of changes in the combination of porosity and soil moisture on the formation of loads and current forces in shallow underground structures. The mechanism for formation of loads at shallow–laying underground structures is considered; the impact of soil humidity factor on the formation of loads at an underground structure, the value and distribution of effective load and the formation of the bending moments in structures are reasoned. Methodology. A data set for the geological environment of right bank Kyiv was gathered for investigation of the issue, including data from 362 boreholes and 512 geological elements, with the sampling depths of up to 60 m beneath the ground level. The surface plots were obtained for dependencies concerning the specific adhesion and ground deformation module to the combined fluidity indicator and porosity coefficient for loam, sandy loam, and clay. The nature of decrease in soil strength indicators (deformation module and specific fluidity) under increasing humidity is shown. The modeling of displacement distribution for soils with different humidity around a shallow–laying tunnel, as well as the formation of loads on the tunnel casing was performed. The dependencies between the bending moments at the tunnel’s arch peak and the change in fluidity value in different types of soils were built. Originality. It consists in the development of ideas about the mechanism of load formation on underground structures of shallow foundation in a changing geological environment. The recommendations were given for considering the potential increase in effective stress in underground structures, depending on the combination of porosity and humidity of soils. Practical implications. Dependences of specific adhesion and modulus of soil deformation on the combination of flow index and porosity coefficient for sands, loams and clays are obtained. Recommendations are given to take into account the possible increase in the existing forces in underground structures depending on the combination of porosity and soil moisture.
{"title":"Impact of varying properties of geological environment on the formation of loads at shallow-laying underground structures","authors":"Геннадій Іванович Гайко, Іван Олександрович Матвійчук, Олена Степанівна Тарасюк","doi":"10.20535/2707-2096.2.2020.207374","DOIUrl":"https://doi.org/10.20535/2707-2096.2.2020.207374","url":null,"abstract":"Purpose. Investigation of the influence of changes in the combination of porosity and soil moisture on the formation of loads and current forces in shallow underground structures. The mechanism for formation of loads at shallow–laying underground structures is considered; the impact of soil humidity factor on the formation of loads at an underground structure, the value and distribution of effective load and the formation of the bending moments in structures are reasoned. Methodology. A data set for the geological environment of right bank Kyiv was gathered for investigation of the issue, including data from 362 boreholes and 512 geological elements, with the sampling depths of up to 60 m beneath the ground level. The surface plots were obtained for dependencies concerning the specific adhesion and ground deformation module to the combined fluidity indicator and porosity coefficient for loam, sandy loam, and clay. The nature of decrease in soil strength indicators (deformation module and specific fluidity) under increasing humidity is shown. The modeling of displacement distribution for soils with different humidity around a shallow–laying tunnel, as well as the formation of loads on the tunnel casing was performed. The dependencies between the bending moments at the tunnel’s arch peak and the change in fluidity value in different types of soils were built. Originality. It consists in the development of ideas about the mechanism of load formation on underground structures of shallow foundation in a changing geological environment. The recommendations were given for considering the potential increase in effective stress in underground structures, depending on the combination of porosity and humidity of soils. Practical implications. Dependences of specific adhesion and modulus of soil deformation on the combination of flow index and porosity coefficient for sands, loams and clays are obtained. Recommendations are given to take into account the possible increase in the existing forces in underground structures depending on the combination of porosity and soil moisture.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78031488","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 : 2020-01-31DOI: 10.20535/2707-2096.1.2020.193950
Анатолій Іванович Крючков, Анатолій Ігорович Бахтин
Purpose. The purpose of this article is to establish the analytical expression of the frequency dispersion dependence of the real part of the dielectric permittivity of cryogenic rocks according to experimental studies. Methodology. Analytical and experimental investigations of the dependence of dielectric permittivity of cryogenic rocks on the field frequency of applied loads at the macro level have been carried out. An empirical analysis of the obtained results was carried out and a comparison of these data with experimental data was performed to prove the adequacy of the proposed mathematical models. Findings. The dielectric permittivity decreases exponentially with increasing frequency at all temperature values. The dependence parameter that corresponds to the frequency at the moment of electrical relaxation (anomalous dispersion zone) shifts toward low frequencies as the temperature decreases. The maximum and minimum values of the dielectric permittivity of cryogenic rocks are constant and independent of temperature change for a particular cryogenic rock and are dependent on humidity, mineralization and morphological structure. Originality. In this article, mathematical expressions are developed to describe the frequency dependence of dielectric permittivity under low frequency and high frequency loading, which is described by a single analytical dependence. Practical implications. The practical significance of the results obtained is the ability to establish seismic-acoustic, elastic-deformation and strength properties of rocks through the study of the characteristics of the electromagnetic properties of cryogenic rocks. Conclusions. The obtained analytical dependence of the dielectric permittivity of mountain cryogenic rocks in the form of a double exponent allows to adequately describe the influence of an external electric field, taking into account the humidity and temperature of the rocks.
{"title":"FREQUENCY DISPERSION DEPENDENCE OF DIELECTRIC PERMITTIVITY OF CRYOGENIC ROCKS AT THE MACRO LEVEL","authors":"Анатолій Іванович Крючков, Анатолій Ігорович Бахтин","doi":"10.20535/2707-2096.1.2020.193950","DOIUrl":"https://doi.org/10.20535/2707-2096.1.2020.193950","url":null,"abstract":"Purpose. The purpose of this article is to establish the analytical expression of the frequency dispersion dependence of the real part of the dielectric permittivity of cryogenic rocks according to experimental studies. Methodology. Analytical and experimental investigations of the dependence of dielectric permittivity of cryogenic rocks on the field frequency of applied loads at the macro level have been carried out. An empirical analysis of the obtained results was carried out and a comparison of these data with experimental data was performed to prove the adequacy of the proposed mathematical models. Findings. The dielectric permittivity decreases exponentially with increasing frequency at all temperature values. The dependence parameter that corresponds to the frequency at the moment of electrical relaxation (anomalous dispersion zone) shifts toward low frequencies as the temperature decreases. The maximum and minimum values of the dielectric permittivity of cryogenic rocks are constant and independent of temperature change for a particular cryogenic rock and are dependent on humidity, mineralization and morphological structure. Originality. In this article, mathematical expressions are developed to describe the frequency dependence of dielectric permittivity under low frequency and high frequency loading, which is described by a single analytical dependence. Practical implications. The practical significance of the results obtained is the ability to establish seismic-acoustic, elastic-deformation and strength properties of rocks through the study of the characteristics of the electromagnetic properties of cryogenic rocks. Conclusions. The obtained analytical dependence of the dielectric permittivity of mountain cryogenic rocks in the form of a double exponent allows to adequately describe the influence of an external electric field, taking into account the humidity and temperature of the rocks.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78860108","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 : 2020-01-31DOI: 10.20535/2707-2096.1.2020.193939
Віктор Георгійович Кравець
An analysis over of character of the isodenses of conical charge explosive products, got by mathematical design, is brought. The features of distribution of the power field are certain depending on direction of initiation of the truncated conical charge. The complex character of intermediate initiator using in a downhole charge as the truncated cone at his location in the ground part of hole is discussed. It is established that the shape of the field of isolines of the density of PD is due primarily to the form of the charge, regardless of the place of its initiation; the prevailing field development occurs relative to the Z axis, that is, along the X axis of the conical charge by the action of its narrow part. This is due to the spread of the products of detonation normal to the sloping surface of the cone. If you associate the total area of the PD density field with the total explosive energy, it is possible to redistribute the flow of energy due primarily to the orientation of the bases and sides of the truncated cone charge, and then to its initiation location. Control of the dynamics and direction of development of the force field is possible by choosing the location of application of the initiating pulse, the vertical direction and traditional movement with the coincidence of areas of the array in the horizontal direction. The advantages of using a mixed circuit switching scheme have been proven by industrial testing of the method.
{"title":"MODELING AND PRACTICAL APPLIKCATION OF A POWER FIELD AT CONIC CHARGE EXPLOSION","authors":"Віктор Георгійович Кравець","doi":"10.20535/2707-2096.1.2020.193939","DOIUrl":"https://doi.org/10.20535/2707-2096.1.2020.193939","url":null,"abstract":"An analysis over of character of the isodenses of conical charge explosive products, got by mathematical design, is brought. The features of distribution of the power field are certain depending on direction of initiation of the truncated conical charge. The complex character of intermediate initiator using in a downhole charge as the truncated cone at his location in the ground part of hole is discussed. It is established that the shape of the field of isolines of the density of PD is due primarily to the form of the charge, regardless of the place of its initiation; the prevailing field development occurs relative to the Z axis, that is, along the X axis of the conical charge by the action of its narrow part. This is due to the spread of the products of detonation normal to the sloping surface of the cone. If you associate the total area of the PD density field with the total explosive energy, it is possible to redistribute the flow of energy due primarily to the orientation of the bases and sides of the truncated cone charge, and then to its initiation location. Control of the dynamics and direction of development of the force field is possible by choosing the location of application of the initiating pulse, the vertical direction and traditional movement with the coincidence of areas of the array in the horizontal direction. The advantages of using a mixed circuit switching scheme have been proven by industrial testing of the method.","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86076653","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 : 2020-01-31DOI: 10.20535/2707-2096.1.2020.193980
Геннадій Іванович Гайко
{"title":"DEVELOPMENT OF STRUCTURES OF THE FLEXIBLE CONNECTION ASSEMBLY OF THE STEEL FRAME SUPPORT FOR RELIABILITY BY GAS FACTOR","authors":"Геннадій Іванович Гайко","doi":"10.20535/2707-2096.1.2020.193980","DOIUrl":"https://doi.org/10.20535/2707-2096.1.2020.193980","url":null,"abstract":"","PeriodicalId":12474,"journal":{"name":"Geomechanics and Geoengineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74905974","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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