黏土的高压三轴剪切特性研究  

Research on Tri-Axial Shear Properties of Clay Under High Pressures

作　　者：马金荣[1] 秦勇[2] 周国庆[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室建筑工程学院,江苏徐州221116 [2]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《中国矿业大学学报》2008年第2期176-179,共4页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(50534040)

摘　　要：低应力作用下与高应力作用下土的力学特性存在较大差异.为了了解高应力下黏土的三轴剪切特性,指导深部地下工程建设,本文运用SKA-1型高压K0固结仪,对高应力下重塑黏土的K0固结不排水、各向等压固结不排水剪切特性进行研究,探讨了不同固结方式下诸如K0值、轴向应变、平均主应力、主应力差等变化规律,结果表明:高应力条件下各向等压固结三轴剪切试验破坏主应力差明显大于K0固结所得的相应值;两种应力路径下黏土的应力-应变关系曲线与低应力条件下三轴剪切试验具有相似的数学模型.The mechanical characteristics of soil differ depending on the level of stress. The shear properties of undrained re-molded clay （K0 and isotonic consolidation） were studied to understand the triaxial shear properties of soil under high stress as a guide for deep, underground construction engineering. An SKA-1 high-pressure K0 consolidation apparatus was used. The changes of indices such as K0, axial strain, average principle stress and principle stress difference were obtained under different consolidation modes. The results show that under high stress the principle failure stress difference is significantly larger under isotonic consolidation than it is under K0 consolidation. The stress-strain curves of two stress paths have similar mathematical models compared to those seen under low stress.

关 键 词：黏土 高压 K0固结 等压固结 三轴剪切 

分 类 号：TU432[建筑科学—岩土工程]