土-结构接触面剪切试验与应力-位移模型  

Tested and modeled shear stress-displacement behavior of soil-structure interface

作　　者：王伟[1] 张芳[1] 孙斌祥[1] 

机构地区：[1]绍兴文理学院土木工程系,浙江绍兴312000

出　　处：《煤炭学报》2011年第9期1469-1473,共5页Journal of China Coal Society

基　　金：浙江省自然科学基金资助项目(Y1080839);教育部科学技术研究重点资助项目(211068)

摘　　要：为研究土-结构接触面的力学特性,进行了4个不同含水率的土-结构接触面改进直剪试验,并结合数学特征对接触面的应力-位移模型进行研究。试验结果表明:①土-岩石接触面、土体内部的抗剪强度均随含水率的增大而减小,而土-砖接触面的抗剪强度随含水率增大基本上先增大后减小;②土-岩石接触面的抗剪强度总小于土体内部抗剪强度;③土-砖接触面的抗剪强度与土体内部抗剪强度的大小关系随含水率增大而变化。提出了一个新的接触面应力-位移复合指数模型,新模型对硬化型和软化型曲线都适用,克服了传统模型的缺陷。对比分析表明,新模型拟合结果与实测数据吻合良好。In order to properly understand mechanical behavior of soil-structure interface,laboratory tests on the interface were carried out by using improved direct shear apparatus in consideration four water contents,and analysis on its stress-displacement model was conducted based on mathematical property points.Investigated test data show that：① shear strength of soil-rock interface and soil itself decreases with higher water content,but that of soil-brick interface increases first and then decreases after reaching one peak value;② shear strength of soil-rock interface is completely smaller than that of soil itself;③ magnitude relationship of shear strength between soil-brick interface and soil itself is uncertain,and it varies with increasing soil water content.On the other hand,a new composite-exponent model to describe interface stress-displacement curve was established,which overcame the weakness of conventional model and was available for both hardening and softening type of stress-displacement curves.Finally,comparison between tests data and new model simulations is performed,and good agreements are found.

关 键 词：土-结构接触面 剪切试验 应力-位移模型 抗剪强度 

分 类 号：TU411.7[建筑科学—岩土工程]