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Journal articles on the topic 'Rock Stress'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Ask, D., O. Stephansson, F. H. Cornet, and M. V. S. Ask. "Rock Stress, Rock Stress Measurements, and the Integrated Stress Determination Method (ISDM)." Rock Mechanics and Rock Engineering 42, no. 4 (2009): 559–84. http://dx.doi.org/10.1007/s00603-009-0058-9.

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2

Zhang, Ke, Zi Nan Wang, Hong Sun, Jian Sun, and Yu Hou Wu. "ANSYS-Based Finite Element Analysis on TBM Disc Cutter." Advanced Materials Research 889-890 (February 2014): 66–73. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.66.

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The purpose of the essay is to know the rock fragmentation mechanism of TBM and improve the efficiency of disc cutter. The method of simulation is applied. The cutter ring and cutter axis surface stress distribution are studied under different rocks and the change of them is analyzed under different penetrations. Under different rocks conditions, the cutter ring surface stress is affected due to the change of rock load; the same rock condition, it is changed along with the change of penetrations. But the cutter axis surface stress changes little. In different rocks conditions, the change of st

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3

Xu, Tao, and Chun An Tang. "Modeling of Stress-Induced Permeability Evolution and Damage of Rock." Advanced Materials Research 33-37 (March 2008): 609–16. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.609.

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Rock permeability is important in civil and geo-hydraulic engineering, the mining and petroleum industries, and in environmental and engineering geology. In this paper, considering the mutual hydro-mechanical response between stress-induced permeability and damage, a coupled mathematical model for solid deformation and gas flow in the coal or rock was established and an attempt is made to investigate the rock permeability evolution, fracture patterns, and flow vectors in rock samples at the scale of usual laboratory samples as well as the relation between permeability and stress induced damage

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4

Liu, Q., W. Chen, J. K. Guo, et al. "Fractional Stress Relaxation Model of Rock Freeze-Thaw Damage." Advances in Materials Science and Engineering 2021 (February 13, 2021): 1–8. http://dx.doi.org/10.1155/2021/3936968.

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Freeze-thaw cycle is a type of fatigue loading, and rock stress relaxation under freeze-thaw cycles takes into account the influence of the freeze-thaw cycle damage and deterioration. Rock stress relaxation under freeze-thaw cycles is one of the paramount issues in tunnel and slope stability research. To accurately describe the mechanical behaviour of stress relaxation of rocks under freeze-thaw, the software element is constructed based on the theory of fractional calculus to replace the ideal viscous element in the traditional element model. The freeze-thaw damage degradation of viscosity co

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5

Asp, Patrik, Margareta Wihlborg, Mattias Karlén, and Ann-Kristin Östlund Farrants. "Expression of BRG1, a human SWI/SNF component, affects the organisation of actin filaments through the RhoA signalling pathway." Journal of Cell Science 115, no. 13 (2002): 2735–46. http://dx.doi.org/10.1242/jcs.115.13.2735.

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The human BRG1 (brahma-related gene 1) protein is a component of the SWI/SNF family of the ATP-dependent chromatin remodelling complexes. We show here that expression of the BRG1 protein, but not of an ATPase-deficient BRG1 protein, in BRG1-deficient SW13 cells alters the organisation of actin filaments. BRG1 expression induces the formation of thick actin filament bundles resembling stress-fibres, structures that are rarely seen in native SW13 cells. BRG1 expression does not influence the activity state of the RhoA-GTPase, which is involved in stress-fibre formation. We find that RhoA is equa

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6

Wang, Guohua, Jun Tan, and Chengxiao Li. "Analysis of rock cracking characteristics during pyrolysis drilling." Thermal Science, no. 00 (2020): 322. http://dx.doi.org/10.2298/tsci200629322w.

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Thermal jet rock breaking technology refers to the use of high temperature medium such as supercritical water for a rapid local heating of rocks to break the rocks. Because of the low thermal conductivity of the rock matrix, thermal stress will only form on the rock surface. When the temperature stress exceeds the strength of the rock, micro-cracks will appear in the rock, and continue to expand, resulting in the thermal cracking on the rock surface, which will cause the rock surface to fall off from the body and break the rock. Based on thermal-solid coupling theory, a pyrolysis drilling mode

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7

Wang, Ru Bin, Wei Ya Xu, and Jiu Chang Zhang. "Modeling Coupled Flow-Stress-Damage during Creep Deformation." Applied Mechanics and Materials 204-208 (October 2012): 3294–98. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.3294.

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In order to reflect the tertiary rheological characteristics of hard rocks at the high stress states, a new nonlinear visco-elastic-plastic model is proposed on the basis of linear visco-elastic-plastic model and nonlinear visco-elastic-plasticity. And then the corresponding constitutive model are deduced, which can be used for describing rocks’ long-term strength characteristics and their creep deformational behavior and time-dependent damage under interaction of coupled seepage-stress field in rock engineering. At last, considering the time effect of rock damage in the process of tertiary cr

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8

Geng, Hansheng, Hongfa Xu, Lei Gao, Ling Chen, Bo Wang, and Xiao Zhao. "Elastic Modulus and Strength of Rock-Like Material with Locked-In Stress." Mathematical Problems in Engineering 2018 (October 30, 2018): 1–17. http://dx.doi.org/10.1155/2018/5320906.

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Locked-in stress is a special stress objectively existing in the rock which has an important influence on the mechanical properties. However, there were few studies on the locked-in stress in rocks. The locked-in stress was simplified into spherical inclusions of stress. Based on the Eshelby inclusion theory, the influence equation of the locked-in stress on the elastic modulus of the rock is derived. Through experiment, the expression of elastic modulus of rock-like material with locked-in stress based on M-T method is determined. Based on Mohr-Coulomb criterion and effective stress principle

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9

Rui, Liu, and Zhu Quanjie. "An Analysis of the Impact of Deviatoric Stress and Spherical Stress on the Stability of Surrounding Rocks in Roadway." Geofluids 2021 (August 30, 2021): 1–13. http://dx.doi.org/10.1155/2021/3095690.

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In this study, a detailed analysis was conducted to evaluate the impacts of the deviatoric stress component and spherical stress component on the stability of surrounding rocks in the roadway via the theoretical analysis and calculation and numerical simulation. Based on the analysis, the distribution laws guiding the main stress differences, plastic zone, convergence of surrounding rocks, and third invariant of stress under various conditions (such as equal spherical stress and unequal deviatoric stress and equal deviatoric stress and unequal spherical stress) were developed, providing an opt

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10

Shi, Da Kun, and Yang Song Zhang. "A Study on Stability of Expressway Tunnel Surrounding Rock Containing Weak Intercalated Rock." Advanced Materials Research 168-170 (December 2010): 2543–47. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2543.

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Weak intercalated rock plays an important role in the stability of engineering rock mass. It controls the mechanism of deformation and breakage of rocks. Systematic numerical tests have been carried out to study the stability of surrounding rock mass with different distributions of weak intercalated rock has been analyzed by the FEM software ABAQUS. All of the numerical modelings are plain-strain type with elasto-plastic constitutive law and Drucker-Prager failure criterion. Some quantificational results about the influence of weak intercalated rock are summarized, especially the influence on

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11

Almisned, Omar A., and Naif B. Alqahtani. "Rock analysis to characterize Saudi soft sandstone rock." Journal of Petroleum Exploration and Production Technology 11, no. 6 (2021): 2381–87. http://dx.doi.org/10.1007/s13202-021-01160-y.

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AbstractAs more engineering projects and activities are taking place on and around weak rocks, it is becoming more important to study and characterize them. Since regular practices of rock mechanical testing are not effective for weak rocks, special laboratory tests and measurements were performed to characterize the Alkharj Saudi weak sandstone rock which is a clastic rock dominantly sandy limestone and sandstone. Test results are presented in this paper. Porosity, permeability, and mechanical properties (stress, strain, Poisson's ratio, confined compressive strength and unconfined compressiv

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12

Zhang, Ruofei, Guangming Zhao, Xiangrui Meng, et al. "Analysis on Characteristics of Surrounding Rocks of Roadway and Bearing Structure Based on Stress Regulation." Advances in Civil Engineering 2021 (March 20, 2021): 1–18. http://dx.doi.org/10.1155/2021/6621961.

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To address the prominent status of great deformation and difficult maintenance of the roadway under high stresses, this study investigated the mechanical characteristics of surrounding rocks and bearing structural stability in a roadway under adjustment and redistribution of stresses through theoretical analysis, numerical simulation, and engineering field test. Stability forms of the bearing structure of roadway surrounding rocks were analyzed by using the axis-changing theory from the perspectives of surrounding rock, mechanical properties of roadways, surrounding rock stress distribution, a

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13

Watson, Julian Matthew, Abouzar Vakili, and Mateusz Jakubowski. "Rock Strength Anisotropy in High Stress Conditions: A Case Study for Application to Shaft Stability Assessments." Studia Geotechnica et Mechanica 37, no. 1 (2015): 115–25. http://dx.doi.org/10.1515/sgem-2015-0013.

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Abstract Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength aniso

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14

Shi, Xuyang, Zhaolin Li, Qingxiang Cai, Wei Zhou, and Wenshuai Li. "Influence of Three-Dimensional Stress Field Variation on Fracture Evolution Characteristics of a Roof." Geofluids 2020 (December 24, 2020): 1–15. http://dx.doi.org/10.1155/2020/8810619.

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Excavation disturbance on the dynamic variation of the three-dimensional stress field is the main cause for the dynamic disasters of the surrounding rock mass of the roof. The stress condition in the surrounding rock mass of the roof during entry excavation and its impact on entry stability are systemically studied in this study. It is found that the surrounding rock mass of the roof is mainly influenced by the combined effect of the stress unloading and stress transference induced by entry excavation. A servo-controlled true triaxial material testing system is used to conduct the true triaxia

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15

Yao, Qiangling, Xuehua Li, Fan Pan, Teng Wang, and Guang Wang. "Deformation and Failure Mechanism of Roadway Sensitive to Stress Disturbance and Its Zonal Support Technology." Shock and Vibration 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/1812768.

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The 6163 haulage roadway in the Qidong coal mine passes through a fault zone, which causes severe deformation in the surrounding rock, requiring repeated roadway repairs. Based on geological features in the fault area, we analyze the factors affecting roadway deformation and failure and propose the concept of roadway sensitive to stress disturbance (RSSD). We investigate the deformation and failure mechanism of the surrounding rocks of RSSD using field monitoring, theoretical analysis, and numerical simulation. The deformation of the surrounding rocks involves dilatation of shallow rocks and s

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16

Zhang, Wenlong, Nianjie Ma, Ji Ma, Chen Li, and Jianju Ren. "Mechanism of Rock Burst Revealed by Numerical Simulation and Energy Calculation." Shock and Vibration 2020 (November 2, 2020): 1–15. http://dx.doi.org/10.1155/2020/8862849.

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We propose a new computational method to calculate the storage elastic energy value of surrounding rocks based on numerical simulation and theoretical calculation. By calculating the difference value in energy under different force states and comparing them with the energy level when rock burst occurs, we get the mechanism of rock burst: when roadway and surrounding rocks are in the condition of large ratio bias force field, certain triggering stress causes mass release of the elastic energy of surrounding rocks around the roadway, and when the energy reaches a certain level, rock burst will o

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17

Tynyna, Serhii, and Ihor Chobotko. "NALYTICAL STUDIES CONCERNING RESISTANCE OF STRESSED ROCKS TO DISINTEGRATION." JOURNAL of Donetsk mining institute, no. 2 (2020): 83–88. http://dx.doi.org/10.31474/1999-981x-2020-2-83-88.

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Purpose. State-of-the art review concerning the effect of stress-strain state of the rock upon its resistance to mechanical breaking is represented. Methods. It is highlighted that while calculating efficient breaking modes of complex stressed rock and parameters of rock-breaking machine organs, it is required to consider the degree of natural stress of the near-face rock under breaking. Results. Necessity to take into account the rock stress degree has been substantiated as the index of breaking strength of stress-free rock samples differs considerably from the one obtained with the considera

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18

Xia, Bin Wei, Ke Hu, Yi Yu Lu, Dan Li, and Zu Yong Zhou. "Model Test Study on Influences of Layered Rock Mass Dip Angle on Stability of Deep-Buried Tunnel." Applied Mechanics and Materials 90-93 (September 2011): 2363–71. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.2363.

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Physical models of layered rock mass with different dip angles are built by physical model test in accordance with the bias failure characteristics of surrounding rocks of layered rock mass in Gonghe Tunnel. Bias failure characteristics of surrounding rocks in thin-layered rock mass and influences of layered rock mass dip angle on stability of tunnel are studied. The research results show that failure characteristics of physical models generally coincide with those of surrounding rocks monitored from the tunnel site. The failure regions of surrounding rock perpendicular to the stratification p

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19

Chigira, Masahiro. "Dissolution and oxidation of mudstone under stress." Canadian Geotechnical Journal 30, no. 1 (1993): 60–70. http://dx.doi.org/10.1139/t93-006.

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Weathering of soft mudstone in nature, characterized by the presence of an oxidized zone and an underlying dissolved zone, was simulated in the laboratory in 15 °C water with a pH of 3–7 and dissolved oxygen contents of 4–16 mg/L under stresses up to 0.49 MPa for as long as 70 days. When the water is acid, hydrogen ions diffuse from the rock–water interface through the rock and attack acid-labile calcite in mudstone preferentially and easily at a well-defined dissolution front, leaving a dissolved zone behind the front. Density decreases, porosity increases, ultrasonic P-wave velocity decrease

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20

Qian, Junfeng, Yongsheng Yao, Jue Li, Hongbin Xiao, and Shenping Luo. "Resilient Properties of Soil-Rock Mixture Materials: Preliminary Investigation of the Effect of Composition and Structure." Materials 13, no. 7 (2020): 1658. http://dx.doi.org/10.3390/ma13071658.

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The physical composition and stress state of soil-rock mixture (SRM) materials have a crucial influence on their mechanical properties, and play a vital role in improving the performance of subgrade. To reveal the resilient behavior and mesostructure evolution of SRM materials, triaxial tests and discrete element method (DEM) numerical analysis have been carried out. In the triaxial test section, the mechanical response of SRM materials was investigated by preparing samples under different stress states and physical states and conducting triaxial tests on samples. Simultaneously, a new irregul

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21

Liu, Yihong, Hongbao Zhao, Lei Wang, Tao Wang, Dongliang Ji, and Rui Liu. "Analysis of Influence of Stress Lode Angle on Stability of Roadway Surrounding Rock." Shock and Vibration 2021 (February 8, 2021): 1–17. http://dx.doi.org/10.1155/2021/6617609.

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Based on the variation range of the stress lode angle, the in situ rock stress is divided into σ v -type stress field, σ H -type stress field, and σ h -type stress field. Through theoretical analysis, the principal stress difference distribution law and plastic zone distribution pattern around the roadway in different types of stress fields are obtained. Theoretical and numerical simulation calculation results show that under different stress lode angle conditions, the principal stress difference distribution of the surrounding rock of the roadway is greatly different, which has a direct effec

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22

Li, Wei, Tie Yan, Si Qi Li, Ling Zhang, and Xing Hua Xu. "Calculation and Analysis of Rock Stress State near the Bit." Advanced Materials Research 594-597 (November 2012): 65–69. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.65.

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Underbalance drilling has been applied to each oil field at home and abroad, due to the advantage of increasing the penetration rate substantially, protecting the reservoir effectively and reducing the drilling costs. But in respect of rock stress state characteristics near the bottom, relatively speaking, the study was rarely.Take the borehole near the bottom in underbalance drilling as the research object, analyze the influence of terrestrial stress, pore pressure and fluid column pressure on mechanics characteristic of rock in the bottom, to study the rock crushing efficiency, well deviatio

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23

Fang, You Ling. "An Experimental Study on Destructive Nature of Seam Roof Strata with Horizontal Bedding." Applied Mechanics and Materials 448-453 (October 2013): 3869–72. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3869.

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Subjected to external forces, the structure surface between rocks (ie, bedding planes) should be deformed under external force. If the two side walls of the rock bedding plane has perfectly flat smooth surface, after the composite layered rock subjected to force, bedding plane can be closed as surface contact manner. However, the rock bedding plane side walls generally showed local contact state in the nature, the rock layers of bedding planes will produce compressive deformation under stress. Through complete stress - strain triaxial loading experimental study on the effects of the presence o

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Rong, Guan, Guang Liu, Di Hou, and Chuang-bing Zhou. "Effect of Particle Shape on Mechanical Behaviors of Rocks: A Numerical Study Using Clumped Particle Model." Scientific World Journal 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/589215.

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Since rocks are aggregates of mineral particles, the effect of mineral microstructure on macroscopic mechanical behaviors of rocks is inneglectable. Rock samples of four different particle shapes are established in this study based on clumped particle model, and a sphericity index is used to quantify particle shape. Model parameters for simulation in PFC are obtained by triaxial compression test of quartz sandstone, and simulation of triaxial compression test is then conducted on four rock samples with different particle shapes. It is seen from the results that stress thresholds of rock sample

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25

Zhai, S. F., S. H. Cao, M. Gao, and Y. Feng. "The Effects of Confining Stress on Rock Fragmentation by TBM Disc Cutters." Mathematical Problems in Engineering 2019 (January 9, 2019): 1–13. http://dx.doi.org/10.1155/2019/5432470.

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In this paper, General Particle Dynamics (GPD3D) is developed to simulate rock fragmentation by TBM disc cutters under different confining stress. The processes of rock fragmentation without confining pressure by one disc cutter and two disc cutters are investigated using GPD3D. The crushed zone, initiation and propagation of cracks, and the chipping of rocks obtained from the proposed method are in good agreement with those obtained from the previous experimental and numerical results. The effects of different confining pressure on rock fragmentation are investigated using GPD3D. It is found

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26

Wang, Hao, Yong-Yan Wang, Zhuo-Qun Yu, and Jian-Guang Li. "Experimental Study on the Effects of Stress-Induced Damage on the Microstructure and Mechanical Properties of Soft Rock." Advances in Civil Engineering 2021 (January 31, 2021): 1–11. http://dx.doi.org/10.1155/2021/6696614.

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After rocks are damaged under stress loading, the changes of their microstructural and mechanical properties are major factors that affect construction safety in geotechnical engineering projects. Studying the microstructures and mechanical behaviors of stress-damaged rocks can help better guide construction and reduce construction risks for geotechnical engineering projects. In this study, a sandstone was first artificially predamaged and then subsequently subjected to scanning electron microscopy (SEM) analysis, computed tomography (CT) scanning, and uniaxial compression testing. Afterwards,

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27

Cha, Min Su, Young Jong Sim, Gye Chun Cho, and Sung Won Lee. "The Effect of Joint Conditions on the Longitudinal and Flexural Wave Velocities of a Rock Mass." Key Engineering Materials 321-323 (October 2006): 306–9. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.306.

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The behavior of a jointed rock is different from that of an intact rock, and the characteristics of elastic wave propagation in a jointed rock are different from those of an intact rock. In this study, a rock resonant column testing device is designed to measure the longitudinal and flexural wave velocities of jointed rocks under different states of stress. A column of more than 12 rock discs is stacked on a steel base, which acts as a free-fixed system. This configuration ensures that waves propagate under an equivalent continuum condition, thereby rendering a constant and unique velocity. Th

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28

Li, Jiazhuo, Penghui Guo, Heng Cui, et al. "Dynamic Response Mechanism of Impact Instability Induced by Dynamic Load Disturbance to Surrounding Rock in High Static Loading Roadway." Minerals 11, no. 9 (2021): 971. http://dx.doi.org/10.3390/min11090971.

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Deep high static loading roadway is extremely prone to rock burst under dynamic load disturbance. The “force-energy criterion” for the failure of surrounding rock in such deep roadways and the “energy criterion” for the rock burst was established by considering the stress and energy evolution characteristics of rock burst under this circumstance. Under the engineering background of the main roadway in No.1 mining area of Gaojiapu Coal Mine in Binchang Mining Area, Shaanxi Province, China, the partial stress field and distortion energy field of surrounding rock in the main roadway and the spati

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29

Hudson, J. A., F. H. Cornet, and R. Christiansson. "ISRM Suggested Methods for rock stress estimation—Part 1: Strategy for rock stress estimation." International Journal of Rock Mechanics and Mining Sciences 40, no. 7-8 (2003): 991–98. http://dx.doi.org/10.1016/j.ijrmms.2003.07.011.

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Shen, Wenlong, Guocang Shi, Meng Wang, et al. "Method of Entry Layout under Synergistic Effects of Abutment Stress and Dynamic Stress." Shock and Vibration 2020 (December 22, 2020): 1–16. http://dx.doi.org/10.1155/2020/6655293.

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In underground mining engineering, rocks around the entry are always subjected to large plastic deformation disasters, such as supporting body failure, roof rock collapse, and even rock burst under abutment stress and dynamic stress. To improve the stability of these rocks, the entry layout under abutment stress and dynamic stress (ELAD) method was put forward to protect the entry from high abutment stress and dynamic stress. Dynamic disturbance intensity (DDI) was determined as the key evaluation index in ELAD, which was divided into “Slightly Disturbed Type,” “Moderately Disturbed Type,” and

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31

Han, Bing, and Qiang Fu. "Study on the Estimation of Rock Rheological Parameters under Multi-level Loading and Unloading Conditions." MATEC Web of Conferences 213 (2018): 02003. http://dx.doi.org/10.1051/matecconf/201821302003.

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Determining reasonable rheological constitutive models based on laboratory rock creep test data and estimating rheological parameters are important means of studying rheological mechanical property of rocks. Previous rock uniaxial or triaxial compression creep tests mostly adopted the method of multi-level loading. In order to study the influence of unloading stress on the estimation of rock rheological parameters, rock triaxial creep tester RLW-2000 was used in this paper to carry out triaxial compression creep tests for granites in a given area with two different stress paths of multi-level

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Li, Zhi Wei, Lai Wang Jing, Ren Shu Yang, and Peng Wei Hao. "The Principle and Method of the Backplane Anchor in Controlling the Overall Stability of the Surrounding Rock." Advanced Materials Research 1065-1069 (December 2014): 835–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.835.

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The purpose of the article is to introduce a kind of control theory and technology of roadway floor heave and the surrounding rock of the upper part deformation in a high stress field. On the basis of the stress state theory in the modern mechanics, this paper which uses Yang Zhuang III1 mining area coal mine hoist room as the research and experimental object proposes a backplane anchor control principle and technology of the overall stability surrounding rock from the perspective of improving the stress state of surrounding rock particles. After the site industrial test,the technology has a v

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Yang, Renshu, Weiyu Li, and Zhongwen Yue. "Comparative Study on Dynamic Mechanical Properties and Energy Dissipation of Rocks under Impact Loads." Shock and Vibration 2020 (October 10, 2020): 1–15. http://dx.doi.org/10.1155/2020/8865099.

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Geological conditions are often complex during rock engineering construction (such as blasting and drilling) and usually involve rocks of several or multiple lithologies. However, comparative studies on the dynamic mechanical response of rocks of different lithologies are relatively few. To study differences in dynamic mechanical properties and energy dissipation of rocks of different lithologies, three kinds of rock that are common in rock engineering and have large differences in wave impedance were selected: red sandstone, gray sandstone, and granite. Samples of these three rocks were subje

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Xu, Wensong, Guangming Zhao, Chongyan Liu, et al. "Evolution Mechanism of Deformation and Failure of Surrounding Rock during Excavation and Unloading of the High-Stress Rock Mass." Advances in Civil Engineering 2020 (November 25, 2020): 1–14. http://dx.doi.org/10.1155/2020/8863540.

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To deeply analyze the failure evolution of surrounding rock during excavation-induced unloading of the high-stress rock mass, a multistage failure model was established based on revealed failure patterns. The critical conditions for wing cracks were determined. The slab crack buckling analysis was carried out. The true-triaxial rockburst testing system was used for the miniature model test to study the fracturing evolution of surrounding rocks during excavation-induced unloading of the high-stress rock mass. The research results indicated that harder rock samples had higher compressive strengt

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Xiaojiao, Zhao, Qu Zhan, Xu Xiaofeng, Yu Xiaocong, Fan Heng, and Song Xijin. "Calculation Model of Rock Fracture Pressure with Multifields in the Process of Fracturing." Mathematical Problems in Engineering 2018 (October 17, 2018): 1–9. http://dx.doi.org/10.1155/2018/2098723.

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In this paper, a comprehensive model to calculate the rock fracture pressure by the theory of double effective stress of porous medium is established, which considers such effective factors as the crustal stress field, hydration stress field, temperature field, tectonic stress field, the porosity of rock, and additional stress field generated by seepage of drilling fluid. This new model is applicable to predict the fracture pressure of different types of rocks. Using the experimental parameters of field fracturing and the experimental results of three-axis compression of rock cores with differ

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Meng, Qingbin, Yanlong Chen, Mingwei Zhang, Lijun Han, Hai Pu, and Jiangfeng Liu. "On the Kaiser Effect of Rock under Cyclic Loading and Unloading Conditions: Insights from Acoustic Emission Monitoring." Energies 12, no. 17 (2019): 3255. http://dx.doi.org/10.3390/en12173255.

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The Kaiser effect reflects the memory of the loaded rock to the irreversible damage and deformation. The stress level, loading rate and lithology are the main factors affecting the Kaiser effect of the rock. To identify the accurate stress point of the Kaiser effect, the MTS 816 rock mechanics testing system and the DS5-A acoustic emission testing and analysis system were adopted. The uniaxial cyclic loading–unloading and acoustic emission characteristic test of 90 rock specimens from three types of rocks under different stress level and loading rate was carried out. The evolution of acoustic

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Ma, Junbiao, Ning Jiang, Xujun Wang, Xiaodong Jia, and Dehao Yao. "Numerical Study of the Strength and Characteristics of Sandstone Samples with Combined Double Hole and Double Fissure Defects." Sustainability 13, no. 13 (2021): 7090. http://dx.doi.org/10.3390/su13137090.

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To explore the failure mechanism of rock with holes and fissures, uniaxial compression tests of sandstone samples with combined double hole and double fissure defects were carried out using Particle Flow Code 2D (PFC2D) numerical simulation software. The failure behaviour and mechanical properties of the sandstone samples with combined double hole and double fissure defects at different angles were analysed, and the evolution results of the stress field and crack propagation were studied. The results show that with a decrease in fissure angle, the crack initiation stress, damage stress, elasti

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Xu, Chongbang, Xiaojing Gao, Kaishun Zhang, Zhiguo Liu, and Fan Zhao. "Constitutive Model of Swelling Gypsum Rock." Advances in Civil Engineering 2020 (October 8, 2020): 1–9. http://dx.doi.org/10.1155/2020/8878005.

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Swelling of soft rock, such as gypsum rock, is one of the major threats in tunnel engineering, causing structure damages such as floor heave and inward movement of sidewalls during construction and operation. It is of practical significance to study the swelling mechanical behavior of such rocks by tests. Swelling strain tests and swelling stress tests were performed by swelling test apparatus to study the variation of swelling strain with time and the swelling stress-strain relationship for gypsum rock samples, respectively. Three stages of the swelling strain on the time-strain curve of gyps

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Azit, Romziah, Mohd Ashraf Mohamad Ismail, Sharifah Farah Fariza Syed Zainal, and Norzani Mahmood. "Rock Overstressing in Deep Tunnel Excavation of Pahang-Selangor Raw Water Transfer Project." Applied Mechanics and Materials 802 (October 2015): 16–21. http://dx.doi.org/10.4028/www.scientific.net/amm.802.16.

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Tunneling under high overburden and in-situ stress may cause tunnel instability because of rock overstressing. Evaluating overstressing in deep hard rocks is crucial to minimize excavation risks. The excavation of the Pahang-Selangor Raw Water Transfer Tunnel is evaluated in this study. A potential overstressing problem is expected at a tunnel depth more than 500 m. Therefore, the possibility of rock overstressing is assessed based on the evaluations of in-situ stress measurement, rock strength, and actual observations during the tunnel excavation. An analytical method is used to analyze the b

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Sun, Zhi Jie. "Stress Predicting on the Surrounding Rocks of Tunnel Based on BP Neural Network." Applied Mechanics and Materials 170-173 (May 2012): 1638–42. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.1638.

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Surrounding rock stress is a one of significant feedback information after tunnel excavation. It is also an important factor influencing the stability of the tunnel, and the premise to determine accurately the tunnel stability. For tunnel surrounding rocks stress determined by many uncertain factors, it is difficult to accurately predict. The BP neural network model for predicting on the stress of the tunnel surrounding rock stress is created. Comparative analyze the results of the surrounding rocks stress prediction on expressway tunnel by momentum gradient algorithm, L-M algorithm and bayesi

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Makówka, Janusz. "Method of Determining the Triaxial Stress State in the Rock Mass with Directed Hydrofracturing / Metoda Określania Trójosiowego Stanu Naprężenia W Górotworze Z Użyciem Ukierunkowanego Hydroszczelinowania." Archives of Mining Sciences 60, no. 3 (2015): 729–41. http://dx.doi.org/10.1515/amsc-2015-0048.

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Abstract Stress state in the rock mass determines design of mine workings, their proper maintenance, and safety of the personnel working there. That is why numerous methods of determining stress state in the rock mass have been devised. One of the categories of such methods are hydraulic ones. The most commonly known methods of hydrofracturing and the HTPF have certain limitations resulting from their assumptions. The presented method based on directed hydrofracturing of rocks enables determining values and directions of principal stresses in the rock mass, independently on the complexity of l

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Malanchuk, Yevhenii, Valerii Korniienko, Larisa Malanchuk, and Vitalii Zaiets. "Research into the moisture influence on the physical-chemical tuff-stone characteristics in basalt quarries of the Rivne-Volyn region." E3S Web of Conferences 201 (2020): 01036. http://dx.doi.org/10.1051/e3sconf/202020101036.

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This paper studies the rock mass stress state of deposits under highland conditions, depending on the geological structure of a particular rock mass area, the tectonic field of stresses and the region relief. This study is aimed to develop an experimental method for assessing and monitoring the properties and state of the rock mass adjacent to mine workings. Experimental studies are performed through stresses measurements in-situ. Based on research results, it has been revealed that the geological structures, tectonic fields of stresses and the earth’s surface relief of the deposit normally re

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Mamot, Philipp, Samuel Weber, Maximilian Lanz, and Michael Krautblatter. "Brief communication: The influence of mica-rich rocks on the shear strength of ice-filled discontinuities." Cryosphere 14, no. 6 (2020): 1849–55. http://dx.doi.org/10.5194/tc-14-1849-2020.

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Abstract. A temperature- and stress-dependent failure criterion for ice-filled rock (limestone) joints was proposed in 2018 as an essential tool to assess and model the stability of degrading permafrost rock slopes. To test the applicability to other rock types, we conducted laboratory tests with mica schist and gneiss, which provide the maximum expected deviation of lithological effects on the shear strength due to strong negative surface charges affecting the rock–ice interface. Retesting 120 samples at temperatures from −10 to −0.5 ∘C and normal stress of 100 to 400 kPa, we show that even f

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Krasnovsky, Andrey. "INVESTIGATION OF STRESS-STRAIN BEHAVIOR OF СOMPOUND ROCK BLOCKS WITH CRACK". Interexpo GEO-Siberia 2, № 4 (2019): 107–13. http://dx.doi.org/10.33764/2618-981x-2019-2-4-107-113.

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In the work stress-strain behavior of compound rock block with crack is considered. Correlations determining components of displacements and stresses at whole border of the rock block, sides of the crack and on the line of crack development and at boundary of rocks are outlined based on system of singular integral equations. Algorithm of numerical realization of these equations is built. The analysis of obtained results is carried out.

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Wei, Jiangbo, Shuangming Wang, Zhou Zhao, Delu Li, and Lipeng Guo. "Numerical Study of Damage to Rock Surrounding an Underground Coal Roadway Excavation." Advances in Civil Engineering 2020 (September 10, 2020): 1–16. http://dx.doi.org/10.1155/2020/8863289.

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In coal mines, underground roadways are required to transport coal and personnel. Such tunnels can become unstable and hazardous. This study simulates deformation and damage in the rock surrounding a shallow coal seam roadway using particle flow code. A numerical model of particle flow in the surrounding rock was constructed based on field survey and drilling data. Microcharacteristic indices, including stress, displacement, and microcrack fields, were used to study deformation and damage characteristics and mechanisms in the surrounding rocks. The results show that the stress within the rock

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Yuan, Chao, Lei Fan, Jian-feng Cui, and Wei-jun Wang. "Numerical Simulation of the Supporting Effect of Anchor Rods on Layered and Nonlayered Roof Rocks." Advances in Civil Engineering 2020 (January 30, 2020): 1–14. http://dx.doi.org/10.1155/2020/4841658.

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In order to clarify the influence of anchor bolts on the supporting effect of the layered weak roof and surrounding rock of nonlayered roof with good integrity, the mechanical model of the roadway with nonlayered homogeneous roof and layered weak roof was established using FLAC3D. The distribution characteristics of the stress field and the displacement field of the bolt support are analyzed, and the supporting effect of the bolt on the roof of two types of roadways is studied. The research results show that when the original rock stress is not considered, the bolt support shows obvious tensil

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Li, Charlie Chunlin. "Field Observations of Rock Bolts in High Stress Rock Masses." Rock Mechanics and Rock Engineering 43, no. 4 (2009): 491–96. http://dx.doi.org/10.1007/s00603-009-0067-8.

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Resende, R., L. N. Lamas, J. V. Lemos, and R. Calçada. "Micromechanical Modelling of Stress Waves in Rock and Rock Fractures." Rock Mechanics and Rock Engineering 43, no. 6 (2010): 741–61. http://dx.doi.org/10.1007/s00603-010-0098-1.

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Mai, W., M. Janiszewski, L. Uotinen, R. Mishra, and M. Rinne. "Monitoring of rock stress change using instrumented rebar rock bolts." IOP Conference Series: Earth and Environmental Science 833, no. 1 (2021): 012141. http://dx.doi.org/10.1088/1755-1315/833/1/012141.

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Palamarchuk, Tetiana. "Theoretical aspects of monitoring synergistic processes in the rock massif." E3S Web of Conferences 109 (2019): 00067. http://dx.doi.org/10.1051/e3sconf/201910900067.

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In this article, the grounds for considering of rocks massif as a nonlinear medium with dissipative properties have been shown that as a result of the combined influence of normal and tangential stresses around the workings, synergistic effects are observed with the formation of similar structures, which leads to the appearance of a quasi-stationary damped stress wave, and this , in turn, makes it possible to predict the nature of changes in the stress-strain state of the rock massif in space-time continuum. Taking into account the influence of the mining operations speed, a theoretical justif

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