桩-土接触面剪切性质室内单剪试验研究  

A Study on Laboratory Simple Shearing Test of Pile-Soil Interface

作　　者：杨丽君[1] 王伟[1] 卢廷浩[2] 

机构地区：[1]绍兴文理学院土木工程系,绍兴市312000 [2]河海大学岩土工程研究所,南京市210098

出　　处：《公路》2008年第8期209-212,共4页Highway

基　　金：浙江省教育厅科研项目,项目编号20061161;国家自然科学基金项目,项目编号40672183

摘　　要：土与混凝土桩的接触面力学行为随土的含水量变化。进行了17%、20%、24%共3组含水量的土与混凝土桩接触面室内单剪试验,每组试验考虑5个法向应力。试验结果表明,在含水量一定时,接触面强度破坏仍遵循摩尔-库仑破坏准则;接触面的抗剪强度、摩擦角随含水量的增大非线性单调减小,粘聚力则先增大后减小。随着含水量和法向应力的增大,接触面的破坏位置逐渐由几何接触界面向土体内部过渡。法向应力较小时,含水量对接触面应力应变曲线的初始段影响不大。试验结果可供相关工程数值分析参考。Water content of soil plays an important role in mechanism behavior of pile-soil interface. Experiments by using laboratory simple shear tests are performed on soil-concrete interfaces with 17%, 20%, 24%, three water contents, where five normal stresses are taken into account in each water content. The experimental data show that while water content is fixed, failure of interface still satisfies the Mohr- Coulomb criterion. With higher water content, shearing strength, friction angle of the interface all decrease monotonously and nonlinearly, but cohesion force of the interface first increases and then decreases after reaching a peak value. With water content increasing, failure position of the interface moves from concrete surface to soil inner part. The initial piece of stress-strain curve of interface is not sensitive to water content of soil. This experimental results put the good foundation for relative engineering numerical simulation.

关 键 词：桩-土接触面 单剪试验 抗剪强度 破坏位置 

分 类 号：U414.18[交通运输工程—道路与铁道工程]