三轴压缩条件下裂隙性黄土的破坏特征  

Failure characteristics of fissured loess under triaxial compression condition

作　　者：卢全中[1,2] 葛修润[1] 彭建兵[2] 冯利斌[2] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]长安大学西部矿产资源与地质工程教育部重点实验室,西安710054

出　　处：《岩土力学》2009年第12期3689-3694,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金重点项目(No.40534021);国土资源大调查项目(No.1212010641403);中国博士后科学基金(No.20090451090);长安大学青年基金(No.06Q07)

摘　　要：通过裂隙性黄土样的三轴压缩试验,利用土样裂隙和侧壁标记的网格在试验前后的对比与直观反映,描述了具有不同裂隙空间形态的不同性状土样在不同试验围压下的破坏特征,总结了其变形破坏规律,试验结果显示,裂隙性黄土的破坏分为脆性破坏和塑性破坏两种类型,表现为极强软化型、强软化型、软化型、理想塑性型(或弱软化型、弱硬化型)和硬化型5种型式,其破坏特征与土样原裂隙的空间形态及性质、试验围压等因素密切相关,形成的破裂面位置主要受土样的原裂隙、变形方式和上下底面透水石的边界控制。After triaxial compression tests to fissured loess samples with different features and different angle values of fissure in samples under different confining pressures, the failure characteristics are described; and deformation and failure rules are generalized by means of measuring the distortion of mesh lines and fissure marked in side face of fissured loess samples. Results of tests show that there are 2 types of failure which are brittle failure and plastic failure; and that there are 5 modes of stress-strain curves with very strong softening, strong softening, softening, perfect plastic（or weak softening, weak hardening） and hardening. The different failure modes are related to such factors as spatial location and feature of fissure in samples and confining pressures of tests. And the position of failure plane in fissured loess is influenced by the deformation modes of samples and fissure in samples and the border of top or bottom pervious stone.

关 键 词：三轴压缩 裂隙性黄土 破坏特征 变形破坏规律 

分 类 号：TU411.7[建筑科学—岩土工程]