粗颗粒含量对粗粒土—混凝土结构接触面剪切力学性质的影响  

Influence of coarse particle content on shear mechanical properties of interface between coarse grained soil and concrete structure

作　　者：刘亚琼 Liu Yaqiong(Zhengzhou Metro Group Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]郑州地铁集团有限公司,郑州450000

出　　处：《工程勘察》2022年第2期7-12,共6页Geotechnical Investigation & Surveying

摘　　要：利用大型直剪试验仪对粗粒土—混凝土结构接触面进行直剪试验,研究粗颗粒含量对接触面剪切力学性质的影响。通过试验获得接触面剪切条件下的强度、黏聚力、摩擦系数、刚度和残余强度等力学参数随粗颗粒含量变化的规律。研究结果表明,粗颗粒含量对接触面剪切力学性质有重要影响。随着粗颗粒含量的增大,接触面上的剪切强度、摩擦系数、残余强度和等效剪切刚度系数均近似呈线性增长,而黏聚力逐渐增长但递增速率先增大而后逐渐变慢。随着粗颗粒含量的增大,接触面剪切的摩擦效应将比黏聚效应显著。研究成果可为粗粒土—桩界面剪切破坏问题研究提供参考。A large-scale direct shear tester is used to conduct direct shear tests on the interface between coarse-grained soil and concrete structure to study the influence of coarse-grained content on the shear mechanical properties of the interface. The variations of the shear mechanical parameters such as strength, cohesion, friction coefficient, stiffness and residual strength with the content of coarse particles are obtained by the tests. The test results show that the content of coarse particles has an important influence on the shear mechanical properties of interface. With the increase of coarse particle content, the shear strength, friction coefficient, residual strength and equivalent shear stiffness coefficient on the interface increase approximately linearly, while the cohesion increases gradually, but the increasing rate firstly increases and then slows down. With the increase of coarse particle content, the friction effect will be more significant than the cohesive effect on the shear interface. The study results could provide a reference for the study on the shear failure of coarse grained soil-pile interface.

关 键 词：土力学 粗粒土 直剪试验 剪切强度 剪切刚度 

分 类 号：TU411[建筑科学—岩土工程]