冻融循环对GCL膨润土垫剪切性能影响初探  

A research on the influence of freezing and thawing cycles on GCL's shearing properties

作　　者：刘丽佳 袁安丽 张滨 LIU Lijia YUAN Anli ZHANG Bin(Heilongj iang Provincial Hydraulic Research Institute, Harbin 150080, China)

机构地区：[1]黑龙江省水利科学研究院,黑龙江哈尔滨150080

出　　处：《黑龙江水利》2016年第11期5-8,共4页

基　　金：国家科技支撑计划项目(2012BAD80B05);水利部科技推广计划项目(TG1138)

摘　　要：通过探讨GCL试样经过100次冻融循环后层间的内摩擦角及黏聚力的变化,结合GCL膨润土自身特性,分析冻融循环对GCL内在结构及力学性能的影响因素,为研究GCL在寒区工程中的应用提供设计依据。从试验结果发现,GCL膨润土垫之间含水率、密实程度及冻融循环次数等因素对GCL的剪切特性均会产生影响,随着冻融次数的增加,黏聚力降低,剪切角减小。通过分析试验结果,可对实际工程边坡衬垫系统的设计和施工提出建议。The research attempts to probe into the changing law of frictional angle and cohesive force after freezing and thawing cycles and makes a analysis of the influence of freezing and thawing on GCL＇ s internal structure and mechanical property through a measurement of the internal frictional angle and cohesive force of GCL samples after 100 freeze-thaw cycles in combination with its own characteristics of geo-synthetic clay liner, which lays a foundation for the research on GCL＇s frost resistance property in cold regions project. Test results indicated that frictional behavior was influenced by water ratio, compaction rate of soil underlayer, hydration condition and freezing and thawing cycles of GCL. Beneficial proposals were given to design and construction of slope liner system in practical project according to analyzing test results.

关 键 词：冻融循环 内摩擦角 黏聚力 抗剪强度 

分 类 号：P642.14[天文地球—工程地质学]