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Sliding modes of fault activation under constant normal stiffness conditions

Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1213-1225页

作者： Chuanqing Zhang Jie Xu Shengji Jin Guojian Cui Yuhang Guo Lingyu Li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Shenyang University of Technology Shenyang110870China

fault activation has been the focus of research community for ***,the studies of fault activation remain immature,such as the fault activation mode and its major factors under constant normal stiffness(CNS)conditions associated with large thickness of fault surrounding rock *** this study,the rock friction experiments were conducted to understand the fault activation modes under the CNS *** major parameters,*** initial normal stress and loading rate,were considered and calibrated in the *** reveal the response mechanism of fault activation,the local strains near the fault plane were recorded,and the macroscopic stresses and displacements were *** testing results show that the effect of displacement-controlled loading rate is more pronounced under the CNS conditions than that under constant normal load(CNL)*** the normal and shear stresses drop suddenly when the stick-slip *** decrease and increase of the normal stress are synchronous with the shear stress in the regular stick-slip scenario,but mismatch with the shear stress during the chaotic stick-slip *** results are helpful for understanding the fault sliding mode and the prediction and prevention of fault slip.

关键词： fault activation Rock friction mechanics Sliding modes Constant normal stiffness(CNS) Displacement-controlled loading rates Rockburst

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Study on instability fracture and simulation of surrounding rock induced by fault activation under mining influence

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Rock Mechanics Bulletin 2023年第2期2卷 32-40页

作者： Jie Chen Kaiwen Shi Yuanyuan Pu Derek B.Apel Chuanjiu Zhang Yujun Zuo Jiongkun Chen Le Xu Zhen Gui Longfei Song School of Resources and Safety Engineering Chongqing UniversityChongqing400044China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China School of Mining and Petroleum Engineering University of AlbertaEdmontonAlbertaT6G 2R3Canada Guoneng Shendong Coal Group Co. LtdChina Mining College Guizhou UniversityGuiyang550025China

The fault is potentially vulnerability's geological structure in the working face and its vicinity,and it is also a crucial geological factor affecting coal mine safety *** investigate the unstable failure of surrounding rock induced by fault activation under the influence of adoption,which was studied utilizing field case and numerical analysis for the deformation and failure process of surrounding rock near the fault-affected *** with field cases,this paper analyzes disturbance stress and roof abscission layer monitoring in effecting zones of fault *** the discrete element 3DEC numerical analysis method,the model of surrounding rock unstable fracture induced by fault activation under adoption is *** unstable fracture and stress variation characteristics of surrounding rock induced by fault activation during the excavation of the upper side wall and lower side wall of the faults are simulated and *** analysis shows that as the coal working face continues to advance,the mining stress gradually *** is a zigzag wave on the relationship curve between coal mining and roof displacement near the fault,which reveals that the surrounding rock of the fault activation affected zone is in the superposition state of static load and dynamic ***,the simulation results show that the stress and displacement of surrounding rock near the fault increase with the advance of coal mining *** closer to the fault plane,the displacement gradually returns to zero,and the stress is also in a lower state.

关键词： Surrounding rock mining fault activation Instability fracture Simulation analysis

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Analysis on activation laws caused by coal mining in fault footwall and its criterion

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Journal of Coal Science & Engineering(China) 2012年第2期18卷 123-128页

作者： YU Wei-jian WANG Wei-jun WU Zhong-jian Hunan Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science and TechnologyXiangtan411201China School of Energy and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China Qujiang Coal Developing Co. Ltd.Fengcheng 331136China

The system research aimed at activation laws caused by coal mining in fault footwall based on the rock strata me- chanics theory in this paper. According to the three-belt characteristics of overlying strata above mined-out area, the fault acti- vation effect was divided into the following three periods： the initial activation, the excessive activation and the ultimate activation. Corresponding activation criterion was also deduced by the mechanics theory. Results of engineering example and numerical analysis show that the activation criterion can reflect the activation laws of fault caused by coal mining.

关键词： fault activation footwall strata movement activation criterion

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Influencing factors and prevention measures of casing deformation in deep shale gas wells in Luzhou block,southern Sichuan Basin,SW China

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Petroleum Exploration and Development 2023年第4期50卷 979-988页

作者： HAN Lingling LI Xizhe LIU Zhaoyi DUAN Guifu WAN Yujin GUO Xiaolong GUO Wei CUI Yue University of Chinese Academy of Sciences Beijing 100049China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Northeast Petroleum University Daqing 163318China

Based on structural distribution and fault characteristics of the Luzhou block,southern Sichuan Basin,as well as microseismic,well logging and in-situ stress data,the casing deformation behaviors of deep shale gas wells are summarized,and the casing deformation mechanism and influencing factors are ***,the risk assessment chart of casing deformation is plotted,and the measures for preventing and controlling casing deformation are ***-activated fault slip is a main factor causing the casing deformation in deep shale gas wells in the Luzhou *** the working area,the approximate fracture angle is primarily 10°-50°,accounting for 65.34%,and the critical pore pressure increment for fault-activation is 6.05-9.71 *** casing deformation caused by geological factors can be prevented/controlled by avoiding the faults at risk and deploying wells in areas with low value of stress *** casing deformation caused by engineering factors can be prevented/controlled by:(1)keeping wells avoid faults with risks of activation and slippage,or deploying wells in areas far from the faulting center if such avoidance is impossible;(2)optimizing the wellbore parameters,for example,adjusting the wellbore orientation to reduce the shear force on casing to a certain extent and thus mitigate the casing deformation;(3)optimizing the casing program to ensure that the curvature radius of the curved section of horizontal well is greater than 200 m while the drilling rate of high-quality reservoirs is not impaired;(4)optimizing the fracturing parameters,for example,increasing the evasive distance,lowering the single-operation pressure,and increasing the stage length,which can help effectively reduce the risk of casing deformation.

关键词： Sichuan Basin Luzhou block shale gas well casing deformation mechanism fault activation risk assessment prevention measure

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