冻融循环作用下非饱和黏土的抗剪强度试验  

Shear strength test of the unsaturated frozen clay under freeze-thaw cycles

作　　者：许强[1] 吴礼舟[1] 张莲花[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《成都理工大学学报（自然科学版）》2011年第3期334-338,共5页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技支撑计划项目(2008BAC47B01);教育部创新团队(IRT0812);国家自然科学基金委基金项目(40902087);留学人员择优资助项目

摘　　要：通过对湖南黏土反复冻融循环后的强度试验,分析了非饱和黏土在冻融循环作用下的强度变化特征,探讨了非饱和状态下不同含水量对强度和变形的影响规律,重点研究了冻融循环对抗剪强度的影响规律。试验结果表明,含水量越大,冻土的抗剪强度越大,相应的内摩擦角和黏聚力也越大。相同含水量,冻融循环次数越多,融土的抗剪强度则越大。除了高含水量,低压力情况下冻土剪切过程中的位移-剪切应力曲线多呈现应变硬化型。The strength experiments of the Hunan clay under different freeze-thaw cycles were carried out in the laboratory.The strength characteristics experiencing freeze-thaw cycles were analyzed.Influence of moisture on frozen soil strength and displacement was concerned.More attentions are particularly been paid to the effect of freeze-thaw cycles on the clay strength.The experiment results show that higher water content means larger strength for the frozen or thawed clays.Freeze-thaw cycles have an effect on strength changes.The results indicate that strain hardening mostly occurs for stress-displacement curves of frozen or thawed clays with different moistures.

关 键 词：非饱和冻土 冻融循环 抗剪强度 含水量 

分 类 号：TU411.3[建筑科学—岩土工程]