卸荷状态下软粘土抗剪强度的试验研究  

Test investigation of shear strength of soft clay in unloading state

作　　者：孟凡丽[1] 樊良本[1] 姚君[1] 

机构地区：[1]浙江工业大学建工学院,浙江杭州310032

出　　处：《浙江工业大学学报》2003年第4期432-435,459,共5页Journal of Zhejiang University of Technology

基　　金：浙江省教育厅基金资助项目 ( 2 0 0 10 0 94 )

摘　　要：通过大量的室内模拟试验 ,对卸荷状态下的软粘土的抗剪强度进行研究 ,得到了不同先期固结压力下卸荷土体的τf-σ关系曲线 ,并与加荷状态的土体进行比较 ,得到了卸荷土体抗剪强度变化的一般规律 ;通过建立卸荷比 R和强度残留率 fr的概念来找寻影响卸荷土体抗剪强度变化的临界点 ;同时研究了卸荷土体的抗剪强度与卸荷比的关系、卸荷后滞留时间对卸荷土体抗剪强度的影响程度 ,发现卸荷土体的抗剪强度受卸荷比和卸荷后的滞留时间的影响很大。In this paper, the shear strength of soft clayed\|soil is investigated in the condition of unloading through a great many laboratory scale\|down tests. By test statistics, the \$τ\-f\|σ\$ relationship of unloading soil at various preconsolidation pressures is described. By comparing with the soil in the state of loading, we can get the general rules of shear strength changes of soil in unloading. Furthermore, by using the unloading ratio (\$R\$) and strength residual ratio (\$f\-r\$),we can get the critical point in the shear strength changes of unloading soil. Meanwhile, in this paper, it is also mentioned the unloading ratio and the remaining time after unloading are greatly contributing to the shear strength changes of unloading soil. Therefore, close attention should be paid to these two factors in the unloading engineering.

关 键 词：卸荷状态 软粘土 抗剪强度 模拟试验 卸荷比 强度残留率 

分 类 号：TU411.7[建筑科学—岩土工程] TU442[建筑科学—土工工程]