页岩力学各向异性及其变形特征的试验研究  

Experimental Study of Mechanics Anisotropy and Deformation Characteristics of Gas Shale

作　　者：徐敬宾[1] 杨春和[1,2] 吴文[1] 郭印同[1] 王磊[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]重庆大学资源与环境科学学院,重庆400444

出　　处：《矿业研究与开发》2013年第4期16-19,91,共5页Mining Research and Development

基　　金：国家重点基础研究发展计划(973)项目(2010CB226701);国家自然科学基金资助项目(51104144)

摘　　要：为深入认识含气页岩力学各向异性及其变形特征,选取典型地表露头页岩,沿与页岩原生层理面呈不同夹角方向取芯,进行纵波波速测试、单轴压缩试验、三轴压缩试验,主要研究含气页岩固有的各向异性及其强度、变形、破裂特征。结果表明:页岩是一种脆性层状岩石,其纵波速度、弹性模量、抗压强度随钻芯角度φ不同存在显著的各向异性;页岩原生层理弱面和围压对其变形、破裂形态有很大影响。纵波速度、弹性模量随钻芯角度φ的增加而降低,抗压强度受弱面影响较大,泊松比变化不明显。单轴压缩时,页岩层理弱面对其破裂形态影响很大,弱面开裂与层间剪切破坏共存;三轴压缩时,围压对其破裂形态影响较大,破裂方式以剪切破裂为主。For deeply understanding the mechanical anisotropy and deformation characteristics of gas shale, the longitudinal wave speed test, uniaxial compression test and triaxial compres- sion test of rock core specimens obtained by drilling typical out- crop gas shale in different angles with shale primary bedding plane were carried out.The inherent anisotropy, strength, deform- ation and fracture characteristics of gas shale were studied.The results showed that as the angle φ of core drilling was different, the longitudinal wave velocity, elastic modulus and compressive strength of shale were obvious anisotropic ; the weak primary bed- ding plane and confining pressure had a great influence on the shale＇s deformation and fracture modes.As increasing of the core drilling angle ~p, the longitudinal wave velocity and elastic modu- lus de6reased, and the compressive strength were influenced by the weak primary bedding plane,while the Poisson^s ratio didn＇t changed significantly.Under uniaxial compression, the weak pri- mary bedding plane had a great influence on fracture mode, in which the weak plane cracking and interlaminar shear fracture coexisted, while under triaxial compression, confining pressure had a greater impact on fracture mode which was mainly shear fracture.

关 键 词：含气页岩 各向异性 压缩试验 破坏形态 

分 类 号：TD315[矿业工程—矿井建设]