大型土与结构接触面循环加载剪切仪的研制及应用  

Development and application of Cyclic Shear Apparatus for Soil-structure Interface

作　　者：张嘎[1] 张建民[1] 

机构地区：[1]清华大学岩土工程研究所,北京100084

出　　处：《岩土工程学报》2003年第2期149-153,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金资助项目 (50 2 790 1 5)

摘　　要：研制了TH -2 0t大型土与结构接触面循环加载剪切仪 ,可用于粗粒土与结构的接触面单调和循环加载试验 ,研究接触面的受力变形机理及规律。该设备可直接在接触面法线方向上施加常压力、常位移和常刚度 3种边界条件 ,施加较大的法向应力 ;进一步改进了接触面变形及应力的测量技术 ,可从宏观和细观两个方面对接触面受力变形进行精确测量。试验表明 ,该设备能够较好地再现和研究粗粒土与结构接触面的主要物理力学特性 ,包括接触面的切。A new apparatus called TH-20t Cyclic Shear Apparatus for Soil structure Interface (TH-20t CSASSI) is developed to investigate the monotonic and cyclic mechanical characteristics of interface between coarse grained soil and structure. The apparatus is designed to run under three normal conditions including constant stress, constant displacement and constant stiffness so that the tangential and normal stress strain relationships and their coupling effects can be examined. The deformation and stress of the interface can be measured automatically and accurately on macro and micro scales. The validity of the apparatus is verified by elementary tests. The test results show that the dilatancy of the interface is remarkable and behaves anisotropically, which imposes a significant effect on stress strain relationships of soil structure interface.

关 键 词：剪切仪 接触面 粗粒土 试验仪器 力学特性 

分 类 号：TU435[建筑科学—岩土工程]