环剪仪在超固结土残余强度分析中的应用  

Application of Ring Shear Apparatus in Analysis of Residual Strength of Over-consolidated Soil

作　　者：尹占巧[1] 许成顺[1] 刘海强[1] 朱可睿[1] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《防灾减灾工程学报》2013年第5期556-560,572,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51278015);国家973计划项目课题(2011CB013600);北京市教委重点项目(KZ201210005010)资助

摘　　要：环剪仪是研究大剪切位移下土的抗剪强度特性的理想设备。对北京工业大学新引进的DTA-138型环剪仪进行了系统的介绍，并利用该仪器对Ip=12的粉质粘土和Ip=36的粘土进行了试验研究。试验结果表明：该环剪仪测试精度高且具有良好的稳定性，能够保证试验结果的准确性；剪切速率在0．1～10°／min范围内时，对粉质粘土和粘土的峰值强度及残余强度郝没有显著影响；超固结比对粉质粘土的峰值强度和残余强度以及粘土的残余强度几乎没有影响，而粘土的峰值强度随着超固结比的增大有增大的趋势，且相同试验条件下粘土的残余强度显著低于粉质粘土的残余强度。Ring shear apparatus is well suited for researching shear strength properties of large shear displacement conditions. This paper systematically introduces the DTA-138 ring shear apparatus newly imported by Beijing University of Technology, and tests were done to silty clay of Ip = 12 and clay of Ip =36 by this apparatus. Test results indicate that： ring shear apparatus used in this study has good stability and high precision for both silty clay and clay, thus can guarantee the accuraty of the test results; shear speed at 0. 1°/min-10°/min has no significant effect on peak strength and residual strength for both silty clay and clay; over-consolidated ratio has al- most no effect on the peak strength and residual strength of silty clay and residual strength of clay, while the peak strength of clay has the increasing trend as the over-consolidation ratio in creased, the residual strength of clay is significantly lower than the residual strength of silty clay at the same test condition.

关 键 词：环剪仪 环剪试验 剪切速率 超固结比 残余强度 

分 类 号：TU411.7[建筑科学—岩土工程]