K_0固结粗粒土剪胀特性大型三轴试验研究  

Study of shear dilatancy behaviors of coarse-grained soil in large-scale triaxial tests under K_0-consolidation condition

作　　者：褚福永[1,2] 朱俊高[3] 殷建华[4] 

机构地区：[1]丽水学院土木工程学系,浙江丽水323000 [2]重庆交通大学水利水运工程教育部重点实验室,重庆400074 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [4]香港理工大学土木及环境工程学系

出　　处：《岩土力学》2013年第12期3431-3436,共6页Rock and Soil Mechanics

基　　金：重庆交通大学水利水运工程教育部重点实验室暨国家内河航道整治工程技术研究中心开放基金资助(No.SLK2012B03);住房和城乡建设部2013年科技计划项目(No.2013-K3-27);高等学校学科创新引智计划(No.B13024);高等学校博士学科点专项科研基金(No.20110094110002)

摘　　要：采用大型三轴剪切仪对不同相对密度的双江口心墙坝覆盖层料,进行了0K固结及各向等压固结条件下的排水剪切试验,探讨了0K固结及各向等压固结条件下粗粒土剪胀性的差异,并检验了修正Rowe剪胀方程对0K固结粗粒土的适用性。结果表明:粗粒土在0K固结条件下,较各向等压固结条件下的剪胀性明显,且这种差异性在密度较小的粗粒料中体现较为突出,而随着密度的增加,差异性逐渐减弱;对试验数据进行非线性拟合,总结出剪胀因子P D与相对密度r D、围压3?之间的关系式,据此可分析不同紧密程度粗粒料剪胀性的强弱;对0K固结粗粒土,修正Rowe剪胀方程能较好地描述其剪胀性。Using large-scale shearing device, Ko consolidation-drained triaxial test and isotropic consolidation-drained triaxial test under different confining pressures are performed for three relative densities （0.9, 0.8, 0.7） overburden material of ShuangJiangKou earth dam. The difference between dilatancy behaviours of coarse-grained soil under Ko -consolidation and isotropic consolidation is investigated. Meanwhile, applicability of the modified Rowe dilatancy equation for coarse-grained soils under K0 -consolidation is tested. The test results show that the dilatancy under K0 -consolidation is more remarkable than that under isotropic consolidation; and this difference is more obvious for coarse-grained soils with lower density. By means of the nonlinear fitting of the results of triaxial tests, a relationship formula for coarse-grained soils under K0 -consolidation and isotropic consolidation among dilatancy factor and relative density and confining pressure is obtained, according to which, the dilatancy＇ strength of coarse-grained soil under different consolidations can be judged. For the coarse-grained materials under K0 -consolidation, of which dilatancy characteristics can be reflected well by the modified Rowe dilatancy equation.

关 键 词：K0固结 大三轴 剪胀 粗粒土 

分 类 号：TU411.5[建筑科学—岩土工程]