绿泥石片岩单轴压缩特征强度各向异性特征研究  

Study on characteristic strength anisotropy of layered chlorite schist under uniaxial compression

作　　者：黄书岭[1] 钟鹏举 丁秀丽[1] HUANG Shuling;ZHONG Pengju;DING Xiuli(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan,Hubei 430010,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《岩石力学与工程学报》2021年第S02期3182-3190,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51779018,51979008);长江科学院创新团队(CKSF2021715/YT)

摘　　要：传统的裂纹应变模型法的理论主要是基于各向同性体建立起来的,采用这种方法获取层状岩体特征强度具有明显的局限性。为研究层状岩体的特征强度,基于横观各向同性理论,提出适应层状岩体求解各特征强度的横观各向同性裂纹应变法;结合绿泥石片岩单轴压缩试验,获得绿泥石片岩变形破坏规律以及闭合强度、起裂强度、损伤强度、峰值强度等各特征强度,分析这些特征强度与峰值强度的关系、以及它们的各向异性特征。结果表明:闭合强度与峰值强度的比值为0.1~0.3,起裂强度与峰值强度的比值为0.3~0.5,损伤强度与峰值强度的比值为0.8~1.0;绿泥石片岩闭合强度、起裂强度、损伤强度与峰值强度随加载方向与层理面的夹角β的增加先减小后增加;损伤强度与峰值强度各向异性度为3~4,具有中等各向异性,闭合强度、起裂强度各向异性度为4~5,具有高各向异性。The theory of traditional crack strain model is mainly based on isotropic body.It has obvious limitations to obtain the characteristic strength of layered rock mass by using this method.In order to study the characteristic strength of layered rock mass,based on the transversely isotropic theory,a transversely isotropic crack strain method is proposed to solve the characteristic strength of layered rock mass.Combined with the uniaxial compression test of chlorite schist,the deformation and failure law of chlorite schist and the characteristic strength characteristics such as closure strength,crack initiation strength,damage strength and peak strength are obtained and the relationship between these characteristic strength and peak strength,as well as their anisotropic characteristics are analyzed.The results show that the ratio of closure strength to peak strength is in the range of 0.1-0.3,that of crack initiation strength to peak strength is in the range of 0.3-0.5,and that of damage strength to peak strength is in the range of 0.8-1.0.The closure strength,crack initiation strength,damage strength and peak strength of chlorite schist first decrease and then increase with the increase of the angle between loading direction and bedding plane.The anisotropy of crack damage strength and peak strength is between 3 and 4 with moderate anisotropy,and the crack closing strength and initiation strength is between 4 and 5,with high anisotropy.

关 键 词：岩石力学 层状岩体 力学特性 特征强度 横观各向同性 裂纹应变模型法 

分 类 号：TU45[建筑科学—岩土工程]