不同倾角层状砂岩单轴压缩及数值模拟试验研究  

Uniaxial Compression and Numerical Simulation of Layered Sandstone with Different Dip Angles

作　　者：韩松波 郑晶[1,2] 解经宇 孟令彬[1] 李勇[1] HAN Songbo;ZHENG Jing;XIE Jingyu;MENG Lingbin;LI Yong(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining&Technology(Beijing),Beijing 100083,China;School of Geosciences&Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Center for Hydrogeology and Environmental Geology,China Geological Survey,Tianjin 300309,China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [3]中国地质调查局水文地质环境地质调查中心,天津300309

出　　处：《水利与建筑工程学报》2022年第2期34-40,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家重点研究计划“CO_(2)注入及封存状态地质与地球物理监测技术与装备”(2018YFB0605503);中央高校基本科研业务费项目。

摘　　要：地下层状岩体存在节理、断层等结构面,层状岩体是许多基础设施和地下工程的载体,层状岩体具有明显的各向异性。为探明具有不同结构面倾角岩石的力学性质和破裂模式对水利裂缝扩展的影响,人工制作不同角度结构面的岩石模型,并开展单轴压缩试验和FLAC^(3D)数值模拟对岩样进行破裂模式和力学参数各向异性分析。结果表明当结构面倾角为0°时,试样发生劈裂破坏,宏观破裂面沿着结构面,结构面主导岩石的破坏模式;倾角为15°、30°和45°时,试样由劈裂张拉破坏逐渐转换为剪切破坏,宏观破坏面主要沿节理面发生,节理主导岩石破坏的作用开始逐渐削弱。倾角60°、75°和90°时,裂缝会穿过结构面,宏观破裂面不沿着节理层面。相同角度的饱水模型的单轴抗压强度明显降低,随着节理面倾角的减小,岩石单轴抗压强度出现先减小再增大的现象,图像趋势为“勺”形。研究结果可为矿区水力裂缝扩展趋势、岩层失稳破坏风险评估提供参考。There are structural planes such as joints and faults in the underground layered rock mass,which is the carrier of many infrastructure and underground projects and has obvious anisotropy.In order to analyze the effects of different structural plane Angle on rock mechanics properties and failure mode of hydraulic fracture,uniaxial compression test and Flac3d numerical simulation were carried out.The results show that when the structural plane angle of 0°,sample frac-turing,macro fracture surface along the structural plane.Structural plane dominates the failure mode of rock.When the inclination angles are 15°,30°and 45°,the fracture failure changes gradually from split tension failure to shear failure.The macroscopic failure surface mainly occurs along the joint plane,and the joint's dominant role in rock failure gradually weakens.When the dip angles are 60°,75°and 90°,the cracks will pass through the structural plane,and the macro-scopic fracture plane does not follow the joint plane.The uniaxial compressive strength of the saturated model with the same angle decreases obviously.With the decrease of the joint plane angle,the uniaxial compressive strength of rock de-creases first and then increases,and the image trend is"spoon"shape.The research results can provide reference for the trend of hydraulic fracture propagation and risk assessment of rock strata instability in mining area.

关 键 词：层状砂岩 数值模拟 结构面倾角 单轴压缩 

分 类 号：TU458.4[建筑科学—岩土工程]