红黏土与混凝土接触面剪切特性试验研究  

Experimental research on shearing properties of interface between red clay and concrete

作　　者：石熊[1] 张家生[1] 刘蓓 孟飞[1] 邓国栋[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《中南大学学报（自然科学版）》2015年第5期1826-1831,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51378514);高速铁路建造技术国家工程实验室基金资助项目(2008G031-Q)~~

摘　　要：采用大型直剪仪进行红黏土与混凝土接触面的单向直剪试验,研究不同法向应力与混凝土表面、不同粗糙度条件下接触面的力学特性,对红黏土与混凝土接触面的应力、应变及破坏形式进行分析。研究结果表明:随着接触面粗糙度的增大,接触面的抗剪强度以及残余强度增大,黏聚力增大,内摩擦角减小;在剪切初始,法向位移随着切向位移的增大而减小,表现为剪缩,之后随着切向位移的继续增大,法向位移增大,表现为剪胀,剪胀速率基本相同;在剪缩阶段,剪缩速率随着法向应力或粗糙度的增大而增大;在剪胀阶段,剪胀速率也随着粗糙度的增大而增大,随着法向应力的增大,剪胀速率基本不变。The mechanical behaviors of interface between red clay and concrete were investigated by unidirectional direct shear tests under different normal stress conditions and different roughnesses. The stress, strain and failure modes of interface were analyzed according to the test. The results show that with the increase of roughness, shear strength of the structure surface and residual stress become larger, cohesion increases and the friction angle decreases increasingly close to the friction angle of the soil. Normal displacement has certain shear shrinkage in the initial stages, and then becomes shear dilation during the shearing process. The rate of shear contraction becomes larger with the increase of normal stress or roughness of contact surface, the rate of shear dilation also becomes larger as the roughness of contact surface increases, while the dilatancy rate is almost the same when the normal stress increases.

关 键 词：红黏土 接触面 粗糙度 大型直剪试验 

分 类 号：TU44[建筑科学—岩土工程]