基于常规三轴试验的陇东黄土力学特性与分析  

Mechanical characteristics and analysis of Longdong loess based on the conventional tri-axial test in Gansu province of china

作　　者：张斌伟[1,2,3] 刘万锋[1,3] 杨霄 王越 

机构地区：[1]陇东学院土木工程学院,甘肃庆阳745000 [2]兰州交通大学土木工程学院,甘肃兰州730070 [3]甘肃省高校"黄土工程性质及工程应用"省级重点实验室,甘肃庆阳745000 [4]甘肃省环县住房与城乡建设局,甘肃环县745700

出　　处：《工程建设》2015年第3期7-11,26,共6页Engineering Construction

基　　金：甘肃省科技支撑计划项目(1204FKCM181);甘肃省庆阳市科技支撑项目(MS2012-08)

摘　　要：利用TSZ-6A型应变控制式三轴仪进行了甘肃陇东(庆阳)某黄土滑坡体土样的室内试验、原状土样的无侧限剪切试验、重塑黄土的加载和卸载试验,分别考虑了不同含水量、不同围压以及初始应力场对于黄土强度的影响,比较了黄土在加载状态和卸载状态下的力学性能,绘制了相应的应力-应变曲线。由试验可知,黄土强度具有极大的结构性,黄土结构的破坏对于其强度影响很大;同时,黄土强度与其含水量、应力状态和应力路径具有重要的联系。The indoor test of soil samples of loess landslide in Qingyang of Gan- su, the non-lateral confined shear test of undisturbed soil sample, the loading and un- loading tests of remodeling loess were conducted by using strain-controlled tri-axial test apparatus （model TSZ-6A）. The effects of different moisture content, different surrounding rock pressure and initial stress field on loess strength were considered re- spectively, and the mechanical properties of loess in the state of loading and unloading state were compared and the corresponding stress-strain curves were drawn. Accord- ing to the experiment, structure characteristic of loess is extreme, and the structural damage of loess has a great influence on its strength. Meanwhile, the strength of loesshas important contact with its moisture content, stress state and stress path.

关 键 词：黄土滑坡 常规三轴试验 黄土强度 应力路径 

分 类 号：TU444[建筑科学—岩土工程] U216.419.1[建筑科学—土工工程]