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Effect of the layer orientation on mechanics and energy evolution characteristics of shales under uniaxial loading

International Journal of Mining Science and Technology 2016年第5期26卷 857-862页

作者： Hou Peng Gao Feng Yang Yugui Zhang Xiangxiang Zhang Zhizhen State Key Laboratory for Geomechanics ＆ Deep Underground Engineering China University of Mining ＆ Technology Xuzhou 221116 China School of Mechanics ＆ Civil Engineering China University of Mining ＆ Technology Xuzhou 221116 China

The uniaxial compression tests were conducted on the cylindrical shale specimens with bedding plane inclined at 0° and 90° to the axial loading direction, respectively. Effect of the bedding orientation on the mechanical property and energy evolution characteristics of shales was revealed. The failure mechanisms of the specimens with layers in 0° orientation showed splitting failure along weak bedding, while the specimens with layers in 90° orientation were failed by shearing sliding. The values of compressive strength, elastic modulus and shear modulus of samples at 0° were higher than those of samples at 90°and there was little difference of Poisson's ratio between samples at 0° and 90°. The analysis of the stress–strain energy and acoustic emission(ae) energy indicated that the growth rate of absorbed energy density and elastic energy density at 0° was significantly faster than that at 90°, hence their final values at 0°were relatively larger than the latter. Moreover, higher energy release was observed for specimens at 0°.The energy release and rapid growth of energy dissipation also appeared more early at 0°. The stress ratio63% was a critical point of energy distribution at which differences started to arise between samples at 0°and 90°. These results indicated that the failure of shale at 0° was more violent and devastative than the failure of shale at 90°.

关键词： Shale Layer orientation energy evolutio Failure mechanism Uniaxial compression ae energy

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Temperature effect on shear behavior of ore-backfill coupling specimens at various shear directions

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Journal of Central South University 2021年第10期28卷 3173-3189页

作者： JIANG Fei-fei ZHOU Hui SHENG Jia LI Xiang-dong KOU Yong-yuan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China National Engineering Research Center for Metal Mining Changsha Institute of Mining Research Co.Ltd.Changsha 410012China School of Resource&Environment and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China Jinchuan Group Co. Ltd.Jinchang 737104China

Understanding the temperature effect on shear behavior of the ore-backfill coupling structure is critical for the safety and stability of backfill stope under the condition of high horizontal stress in deep *** shear tests were carried out on the cemented rod-mill sand backfill(CRB)and ore-CRB(OCRB)coupling specimens at various temperatures(20,40 and 60°C).The shear behavior and ae characteristic parameters of OCRB at different shear directions were compared and *** results show that the temperature effect on the shear performance of CRB mainly depends on the characteristics of microstructures and main mineral phases;the performance of CRB at 40°C is relatively good;the shear deformation of OCRB has one more“peak fluctuation stage”than CRB and has a good correlation with ae characteristic *** temperature can positively or negatively impact the shear strength of OCRB,depending on the temperature and shear direction;the shear performance of OCRB along the axis direction(D1)is significantly better than that perpendicular to the axis direction(D2).The co-bearing capacity of the ore-backfill coupling structure(i.e.,stopes)is closely related to the ambient temperature and principal stress orientation.

关键词： cemented backfill ore-backfill temperature shear direction shear strength ae energy

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