黑色页岩三轴加载过程中层理效应对力学特征和能量耗散的影响  

INFLUENCE OF BEDDING EFFECT ON MECHANICAL CHARACTERISTICS AND ENERGY DISSIPATION IN TRIAXIAL LOADING PROCESS OF BLACK SHALE

作　　者：罗波 朱宝龙[1] 刘俊新[1] 陈强 LUO Bo;ZHU Baolong;LIU Junxin;CHEN Qiang(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;School of Earth Science and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南科技大学土木工程与建筑学院,绵阳621010 [2]西南交通大学地球科学与环境工程学院,成都610031

出　　处：《工程地质学报》2023年第3期1027-1037,共11页Journal of Engineering Geology

基　　金：国家自然科学基金(资助号:41672342)。

摘　　要：为探讨黑色页岩层理对其力学特征与能量耗散过程的影响,以龙马溪组黑色页岩为研究对象,采用室内常规三轴压缩试验,得到了不同围压、不同层理倾角的特征应力、体积应变、裂纹应变,再根据能量平衡原理分析了裂纹应变与能量演化机制。研究结果表明:在相同围压值下,特征应力以及特征应力比随着层理面倾角的增加呈现出先减小后增大的“V”型趋势;随着围压的增加,耗散能突变点能量密度会逐渐增大;耗散比随轴向裂纹应变的增加呈现出先减小后增大的“V”型趋势;试样破坏前后,弹性应变能与耗散能受层理面倾角影响具有一定的转换关系。本研究成果对于进一步探明黑色页岩层理效应对其力学特征与能量演化机制的影响提供了参考。In order to explore the influence of black shale bedding on its mechanical characteristics and energy dissipation process,this paper uses the black shale of Longmaxi Formation as the research object,obtains the characteristic stresses,volume strain and crack strain under different confining pressures and bedding dip angles with indoor conventional triaxial compression tests and analyses the crack strain and energy evolution mechanism according to the principle of energy balance.The research shows that the characteristic stress and characteristic stress ratio show a“V”-shaped trend with the increase of the bedding surface inclination under the same confining pressure value.As the confining pressure increases,the energy density of the dissipated energy mutation point gradually increases.The dissipation ratio presents a“V”-shaped trend with the increase of axial crack strain.Before and after the failure of the rock samples,there is a certain conversion relationship between elastic strain energy and dissipation energy with the bedding.The research results provide a reference for further exploring the influence of black shale bedding effects on its mechanical characteristics and energy evolution mechanism.

关 键 词：黑色页岩 层理 特征应力 能量耗散 

分 类 号：TU452[建筑科学—岩土工程]