Pub Date : 2024-09-01DOI: 10.1134/s1062739124020145
M. V. Ryl’nikova, R. V. Berger, I. V. Yakovlev, V. I. Tatarnikov, P. O. Zubkov
Abstract
To reduce intensity of deformation in rocks prone to buckling and plastic deformation, and sensitive to geo- and gas-dynamic phenomena, the authors propose a consolidated backfill technology using salt waste and processing reuse brine at the consumption limits of water-yielding capacity. A set of laboratory tests is carried out to find backfill mixtures adaptable to deep-level potash mining with estimation of deformation characteristics and strength properties of potash salt rocks. New principles and technologies of deep-level sylvinite extraction and backfill material transport by creating such geotechnical structures in stopes which ensure formation of consolidated backfill mass with the mined-out stope space factor close to one. This approach can enhance mine efficiency owing to increased extraction of sylvinite from rib and safety pillars.
{"title":"Backfill Technologies and Designs for Deep-Level Sylvinite Mining","authors":"M. V. Ryl’nikova, R. V. Berger, I. V. Yakovlev, V. I. Tatarnikov, P. O. Zubkov","doi":"10.1134/s1062739124020145","DOIUrl":"https://doi.org/10.1134/s1062739124020145","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>To reduce intensity of deformation in rocks prone to buckling and plastic deformation, and sensitive to geo- and gas-dynamic phenomena, the authors propose a consolidated backfill technology using salt waste and processing reuse brine at the consumption limits of water-yielding capacity. A set of laboratory tests is carried out to find backfill mixtures adaptable to deep-level potash mining with estimation of deformation characteristics and strength properties of potash salt rocks. New principles and technologies of deep-level sylvinite extraction and backfill material transport by creating such geotechnical structures in stopes which ensure formation of consolidated backfill mass with the mined-out stope space factor close to one. This approach can enhance mine efficiency owing to increased extraction of sylvinite from rib and safety pillars.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020029
Ronghuan Cai, Yishan Pan, Yonghui Xiao, Feiyu Liu
Abstract
In order to clarify the relationship between the mechanical properties of coal-rock composite and the loading rate and rock–coal strength ratio, uniaxial compression tests were carried out on coal-rock combinations with three different rock–coal strength ratios at four different loading rates. The rock–coal strength ratio (lambda) is a ratio of the compression strength of rock to the compression strength of coal. The test results indicate that the relationship between the mechanical properties of coal-rock composite and loading rate is influenced by both the strong and weak components in the composite. The peak stress and elastic modulus mainly depend on the weak component, while the peak strain is determined by both the strong and weak components. For peak stress and elastic modulus, when the weak body is the same, the relationship with loading rate is the same, otherwise it is different. The relationship between the mechanical properties of coal-rock combination and (lambda) is not affected by the loading rate. The weak body in the coal-rock combination is the main body of damage, and the greater the value of (lambda), the more severe the damage. At the same time, the failure mode shows a gradual transition from weak body failure inducing strong body failure to only weak body failure.
{"title":"Study on Loading Rate and Rock–Coal Strength Ratio Effect on Mechanical Properties of Coal–Rock Combination","authors":"Ronghuan Cai, Yishan Pan, Yonghui Xiao, Feiyu Liu","doi":"10.1134/s1062739124020029","DOIUrl":"https://doi.org/10.1134/s1062739124020029","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In order to clarify the relationship between the mechanical properties of coal-rock composite and the loading rate and rock–coal strength ratio, uniaxial compression tests were carried out on coal-rock combinations with three different rock–coal strength ratios at four different loading rates. The rock–coal strength ratio <span>(lambda)</span> is a ratio of the compression strength of rock to the compression strength of coal. The test results indicate that the relationship between the mechanical properties of coal-rock composite and loading rate is influenced by both the strong and weak components in the composite. The peak stress and elastic modulus mainly depend on the weak component, while the peak strain is determined by both the strong and weak components. For peak stress and elastic modulus, when the weak body is the same, the relationship with loading rate is the same, otherwise it is different. The relationship between the mechanical properties of coal-rock combination and <span>(lambda)</span> is not affected by the loading rate. The weak body in the coal-rock combination is the main body of damage, and the greater the value of <span>(lambda)</span>, the more severe the damage. At the same time, the failure mode shows a gradual transition from weak body failure inducing strong body failure to only weak body failure.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020078
Xiao Yonghui, Pan Yishan, Li Yuwei
Abstract
In response to the engineering problem of severe damage to tunnels caused by coalburst, which leads to support failure and personnel casualties, a method of preventing coalburst through the support and energy-absorbing effects of supports has been proposed. An energy-absorbing hydraulic support is designed for circular or arched tunnels: it is called gantry energy-absorbing hydraulic support. The support mainly consists of three parts: an arched top beam, a micro-arc base, and an energy-absorbing hydraulic column. Through experiments, two types of the energy-absorbing components were compressed and tested. The results show that the average yield strength of a single anti-impact component is 1840 kN, and the energy absorption is 180 kJ when compressed by 100 mm. The average yield strength of the double section anti-impact component is 2460 kN, and the energy absorption is 410kJ when compressed by 100 mm. Both of these energy-absorbing components with a total energy absorption capacity of over 700 kJ are used in actual gantry energy-absorbing hydraulic support.
{"title":"Prevention and Control of Coalburst in Tunnels Using Gantry Energy-Absorbing Hydraulic Support","authors":"Xiao Yonghui, Pan Yishan, Li Yuwei","doi":"10.1134/s1062739124020078","DOIUrl":"https://doi.org/10.1134/s1062739124020078","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In response to the engineering problem of severe damage to tunnels caused by coalburst, which leads to support failure and personnel casualties, a method of preventing coalburst through the support and energy-absorbing effects of supports has been proposed. An energy-absorbing hydraulic support is designed for circular or arched tunnels: it is called gantry energy-absorbing hydraulic support. The support mainly consists of three parts: an arched top beam, a micro-arc base, and an energy-absorbing hydraulic column. Through experiments, two types of the energy-absorbing components were compressed and tested. The results show that the average yield strength of a single anti-impact component is 1840 kN, and the energy absorption is 180 kJ when compressed by 100 mm. The average yield strength of the double section anti-impact component is 2460 kN, and the energy absorption is 410kJ when compressed by 100 mm. Both of these energy-absorbing components with a total energy absorption capacity of over 700 kJ are used in actual gantry energy-absorbing hydraulic support.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020017
V. N. Oparin
Abstract
The article focuses on formulation and substantiation of a problem of safe subsoil management in view of the more and more difficult geological and climatic conditions, as well as growing depth and scale of mineral mining. It is shown that the current basic and applied research has created prerequisites for a successful solution of this problem. In Russia these prerequisites are connected with finding energy-based mechanisms of origination and growth of high-stress concentration and destruction zones in rock masses and geomaterials which feature a hierarchical block structure and many phases, and show properties of open self-organizing geosystems in the tectonic stress and strain field. Using advances in nonlinear geomechanics and geophysics, and cloud technologies of Big Data, a new methodology, technologies and software systems are developed for shaping a multilayer geoinformation and monitoring system for diagnostics, control and prediction of the industrial and ecological safety of mining regions in Russia.
{"title":"Topicality of the Framework and General Theory for Safe Deep-Level Mining of Hydrocarbon-Bearing Formations","authors":"V. N. Oparin","doi":"10.1134/s1062739124020017","DOIUrl":"https://doi.org/10.1134/s1062739124020017","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article focuses on formulation and substantiation of a problem of safe subsoil management in view of the more and more difficult geological and climatic conditions, as well as growing depth and scale of mineral mining. It is shown that the current basic and applied research has created prerequisites for a successful solution of this problem. In Russia these prerequisites are connected with finding energy-based mechanisms of origination and growth of high-stress concentration and destruction zones in rock masses and geomaterials which feature a hierarchical block structure and many phases, and show properties of open self-organizing geosystems in the tectonic stress and strain field. Using advances in nonlinear geomechanics and geophysics, and cloud technologies of Big Data, a new methodology, technologies and software systems are developed for shaping a multilayer geoinformation and monitoring system for diagnostics, control and prediction of the industrial and ecological safety of mining regions in Russia.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020030
Wang Kaixing, Wu Bin, Pan Yishan, A. P. Khmelinin, A. I. Chanyshev
Abstract
This article experimentally investigates the characteristics of (P)-wave propagation in block rock mass when blocks fracture transversely and longitudinally. The velocity of (P)-wave, rock block acceleration, kinetic energy, displacement response, and the time–frequency response of rock block were analyzed. The results show that when the rock block fractures, the (P)-wave velocity decreases, the acceleration response duration time increases, and the maximum acceleration and kinetic energy decrease. However, transverse fractures show a more evident decrease in the acceleration and kinetic energy near the fracture area, and longitudinal fractures show a more evident decrease in the displacement amplitude far from the fracture area. On transverse fractures, the dominant frequency of acceleration and kinetic energy leads to a low value near the fracture area, but the dominant frequency of displacement—to a high value. Longitudinal fracture leads to a dominant frequency of block response occurrence time delayed far from the fracture area.
{"title":"Experimental Investigation of Block Fracture Influence on P-Wave Propagation in Block Rock Mass","authors":"Wang Kaixing, Wu Bin, Pan Yishan, A. P. Khmelinin, A. I. Chanyshev","doi":"10.1134/s1062739124020030","DOIUrl":"https://doi.org/10.1134/s1062739124020030","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This article experimentally investigates the characteristics of <span>(P)</span>-wave propagation in block rock mass when blocks fracture transversely and longitudinally. The velocity of <span>(P)</span>-wave, rock block acceleration, kinetic energy, displacement response, and the time–frequency response of rock block were analyzed. The results show that when the rock block fractures, the <span>(P)</span>-wave velocity decreases, the acceleration response duration time increases, and the maximum acceleration and kinetic energy decrease. However, transverse fractures show a more evident decrease in the acceleration and kinetic energy near the fracture area, and longitudinal fractures show a more evident decrease in the displacement amplitude far from the fracture area. On transverse fractures, the dominant frequency of acceleration and kinetic energy leads to a low value near the fracture area, but the dominant frequency of displacement—to a high value. Longitudinal fracture leads to a dominant frequency of block response occurrence time delayed far from the fracture area.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020091
A. A. Panzhin, N. A. Panzhina
Abstract
Movements and deformations of ground surface at the Almaz-Zhemchuzhina deposit are studied using surveying techniques. The source data in estimation of parameters and patterns of the stress–strain behavior were observations over the recent geodynamic movements using survey markers and GPS / GLONASS technologies. The proposed scientific approach and guidelines on the use of the studies of trend and cycling geodynamic movements made it possible to determine the natural stress–strain parameters and to accomplish zoning of the test area by the intensities of the movements.
{"title":"Ground Surface Movements and Deformations at Almaz-Zhemchuzhina Deposit from Surveying Techniques","authors":"A. A. Panzhin, N. A. Panzhina","doi":"10.1134/s1062739124020091","DOIUrl":"https://doi.org/10.1134/s1062739124020091","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Movements and deformations of ground surface at the Almaz-Zhemchuzhina deposit are studied using surveying techniques. The source data in estimation of parameters and patterns of the stress–strain behavior were observations over the recent geodynamic movements using survey markers and GPS / GLONASS technologies. The proposed scientific approach and guidelines on the use of the studies of trend and cycling geodynamic movements made it possible to determine the natural stress–strain parameters and to accomplish zoning of the test area by the intensities of the movements.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s106273912402008x
E. V. Denisova, K. O. Sokolov, A. P. Khmelinin, A. I. Konurin, D. V. Orlov
Abstract
Ground-penetrating radar is used to study defects in the form of internal layers in concrete structures. It is found that modulus of deflection coefficient of GPR signals changes as function of the layer thickness and electromagnetic properties of the material filling the layer (sand, wet sand or air). The experimental and numerical research used the method of peak-to-peak amplitude ratio, which enabled determining the Fresnel coefficients for the upper and lower boundaries of a layer. The minimal layer thickness recorded by GPR was 2 mm.
{"title":"Estimating Thickness of Defects at Rock-Concrete Lining Interface by Ground-Penetrating Radar","authors":"E. V. Denisova, K. O. Sokolov, A. P. Khmelinin, A. I. Konurin, D. V. Orlov","doi":"10.1134/s106273912402008x","DOIUrl":"https://doi.org/10.1134/s106273912402008x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Ground-penetrating radar is used to study defects in the form of internal layers in concrete structures. It is found that modulus of deflection coefficient of GPR signals changes as function of the layer thickness and electromagnetic properties of the material filling the layer (sand, wet sand or air). The experimental and numerical research used the method of peak-to-peak amplitude ratio, which enabled determining the Fresnel coefficients for the upper and lower boundaries of a layer. The minimal layer thickness recorded by GPR was 2 mm.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The spontaneous high-temperature conditions in deep mining cause significant changes in one of the factors that determine the risk of rock burst in coal mine roadways. Therefore, based on the test method of the bursting proneness of coal, uniaxial loading tests were conducted on coal specimens under different thermal loads to explore the variations in the bursting proneness and energy release of heated coal, analyze the variations and mechanism controlling the coal skeleton, physicochemical properties, quality, fracture mode evolution, and macrocrack quantity with different loading rates, and calculate and discuss the changes in the critical conditions of a coal–rock system during heating. In summary, the study of the change in bursting energy release caused by the heating of coal can lay the foundation for the engineering-based prevention and control of composite dynamic disasters in deep coal mines.
{"title":"Rockburst Hazard and Energy Release in Coal in Case of Thermal-Mechanical Coupling","authors":"Dewei Fan, Aiwen Wang, Yishan Pan, Linghai Kong, Shankun Zhao, Kun Lv","doi":"10.1134/s1062739124020108","DOIUrl":"https://doi.org/10.1134/s1062739124020108","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The spontaneous high-temperature conditions in deep mining cause significant changes in one of the factors that determine the risk of rock burst in coal mine roadways. Therefore, based on the test method of the bursting proneness of coal, uniaxial loading tests were conducted on coal specimens under different thermal loads to explore the variations in the bursting proneness and energy release of heated coal, analyze the variations and mechanism controlling the coal skeleton, physicochemical properties, quality, fracture mode evolution, and macrocrack quantity with different loading rates, and calculate and discuss the changes in the critical conditions of a coal–rock system during heating. In summary, the study of the change in bursting energy release caused by the heating of coal can lay the foundation for the engineering-based prevention and control of composite dynamic disasters in deep coal mines.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020121
S. D. Viktorov, V. M. Zakalinskii, I. E. Shipovskii, R. Ya. Mingazov
Abstract
The authors put forward a look-ahead concept of science-based problem solving in deep-level mining. The issues of the problem realization and tooling are also addressed. A borehole charge is designed as a cluster of close-spaced borehole charges to produce the directed blast effect by varying the cluster charge layout in a wide range. Using alternative technical capabilities of drilling, it is possible to variously redisperse the same equivalent energy in the single large-diameter borehole charge and in the cluster of smaller diameter borehole charges. The blast mechanism of the cluster charge pushes the limits of its application range and offers new approaches to problem solving in deep-level mining. Some technological aspects of geotechnologies are presented through the results of modeling the new approach to blast-induced impact using smooth particle hydrodynamics. Some tentative research findings inspire continuing with the study.
{"title":"Effect of Directed Blasting on Geotechnology and Geomechanical Behavior of Rock Mass in Deep-Level Mining","authors":"S. D. Viktorov, V. M. Zakalinskii, I. E. Shipovskii, R. Ya. Mingazov","doi":"10.1134/s1062739124020121","DOIUrl":"https://doi.org/10.1134/s1062739124020121","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The authors put forward a look-ahead concept of science-based problem solving in deep-level mining. The issues of the problem realization and tooling are also addressed. A borehole charge is designed as a cluster of close-spaced borehole charges to produce the directed blast effect by varying the cluster charge layout in a wide range. Using alternative technical capabilities of drilling, it is possible to variously redisperse the same equivalent energy in the single large-diameter borehole charge and in the cluster of smaller diameter borehole charges. The blast mechanism of the cluster charge pushes the limits of its application range and offers new approaches to problem solving in deep-level mining. Some technological aspects of geotechnologies are presented through the results of modeling the new approach to blast-induced impact using smooth particle hydrodynamics. Some tentative research findings inspire continuing with the study.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020133
V. N. Odintsev, V. V. Makarov
Abstract
This study proposes a mathematical fracture model including processes of fracture of structural bonds on micro scale (tens microns) and meso scale (millimeters and centimeters), as well as interaction of structural fragments on macro scale (fractures longer then tens centimeters). The model uses two geometrical criteria of fracture growth, connected with the structure of rocks and governing transition between structural scale. The problem on the stress–strain behavior of an elastic medium near a fracture at the change in the fracture length and in the scale of its influence is solved. The limit equilibrium of a fracture is analyzed. For a meso-scale fracture, such condition is unstable, and the fracture, therefore, develops dynamically and up to a macro scale. Sufficiently long macro fractures can grow in the mode of quasi statics due to independent advance of fracture tips.
{"title":"Multilevel Model of Cleavage Fracture in Brittle Rocks in Compression","authors":"V. N. Odintsev, V. V. Makarov","doi":"10.1134/s1062739124020133","DOIUrl":"https://doi.org/10.1134/s1062739124020133","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This study proposes a mathematical fracture model including processes of fracture of structural bonds on micro scale (tens microns) and meso scale (millimeters and centimeters), as well as interaction of structural fragments on macro scale (fractures longer then tens centimeters). The model uses two geometrical criteria of fracture growth, connected with the structure of rocks and governing transition between structural scale. The problem on the stress–strain behavior of an elastic medium near a fracture at the change in the fracture length and in the scale of its influence is solved. The limit equilibrium of a fracture is analyzed. For a meso-scale fracture, such condition is unstable, and the fracture, therefore, develops dynamically and up to a macro scale. Sufficiently long macro fractures can grow in the mode of quasi statics due to independent advance of fracture tips.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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