泥页岩浸水力学特性试验研究  

Experimental Study on Mechanical Properties of Soaked Shale

作　　者：金成 王芳[1,2] 石崇[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098

出　　处：《长江科学院院报》2017年第9期122-126,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB057903);国家自然科学基金青年项目(51309089);江苏省基础研究计划(自然科学基金)项目(BK20130846)

摘　　要：为研究泥页岩遇水软化后力学特性变化,进行了泥页岩不同浸水时间下的常规三轴压缩试验,分析了浸水后岩石的应力-应变关系,研究了泥页岩水劣化力学参数变化规律研究。结果表明:随着浸水时间的延长,试样的强度和弹性模量降低幅度较大,浸水对泥页岩的摩擦角影响较小,对黏聚力影响显著;试样破坏形式逐渐由脆性张拉劈裂破坏转变为拉剪破坏的混合破坏形式,软化作用越来越明显。岩石浸水时间对其强度、变形及破坏形式有较为明显的影响。研究结果可为该类岩体的岩土力学参数取值或力学分析提供参考。The mechanical properties of shale vary after being soaked and softened in water. In view of this, triaxial compression tests were conducted on shale soaked in water for different durations. The relationship between stress and strain of soaked shale was revealed, and the variation regularity of mechanics parameters of shale was obtained under the action of water deterioration. Results indicate that the strength and elastic modulus of soaked shale speci- mens reduced greatly with the increase of soaking duration. Water soaking had small influence on frictional angle of soaked shale, but significant impact on cohesion. In addition, as the softening cant, the failure mode of shale specimens gradually changed from brittle tensile form of tension and shear. The strength reduced and ductility effect became increasingly splitting failure to a mixed signifi- failure increased when softening action became increasingly significant. Soaking duration has significant impact on strength, deformation and failure mode. The results offer ref- erence for determining geotechnical parameters or mechanical analysis of shale.

关 键 词：泥页岩 软化作用 浸水时间 三轴压缩试验 力学特性 应力-应变曲线 

分 类 号：TU45[建筑科学—岩土工程]