裂隙性黄土力学特性试验研究  

An experimental study on mechanical properties of fractured loess

作　　者：孙萍[1,2] 彭建兵[3] 吴树仁[1,2] 卢全中[3] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]国土资源部新构造运动与地质灾害重点实验室,北京100081 [3]长安大学地测学院,陕西西安710054

出　　处：《中南大学学报（自然科学版）》2015年第6期2188-2195,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41472296);"十二五"国家科技支撑计划项目(2012BAK10B02)~~

摘　　要：裂隙性黄土中存在的节理裂隙结构面改变黄土本身的细微观结构,是黄土地区地裂缝、地面沉陷、滑坡、崩塌和水土流失等地质灾害的构造基础之一。以陕西三原Q2裂隙性黄土为研究对象,分别对0°,30°,45°,60°及90°5种不同角度裂隙试样进行单轴拉伸试验及三轴剪切试验研究,分析不同角度裂隙黄土试样的拉应力-应变关系及不同围压下不同角度裂隙黄土试样的剪应力-应变关系,探讨裂隙性黄土的抗拉破裂特性及抗剪破裂特性,为深入研究地质环境下黄土体中地质灾害的力学机制提供参考。The joint structural plane changes the fine microstructure of loess itself, and it is one of the structure factors of geo-hazards in loess areas, such as ground fissures, ground subsidence, landslide, collapse and loss of soil and water, etc. Taking Shaanxi Sanyuan Q2 fractured loess as a case study, the loess fracture specimens with five different fracture angles of 0°, 30°, 45°, 60° and 90° were tested by uniaxial tensile test and triaxial shear test. Both the tensile and shear stress-strain relationships of fractured loess specimens under different confining pressures were discussed, and the tensile fracture and shear fracture characteristics were studied, which is enlightening for further research on mechanism of geo-hazards in geo-environment of loess area.

关 键 词：裂隙性黄土 拉伸 剪切 应力-应变 破裂特性 

分 类 号：P642.2[天文地球—工程地质学]