三维加载条件下粗粒土与结构接触面力学特性的试验研究  

Progressive test investigation on 3D behavior of gravel-structure interface

作　　者：冯大阔[1,2] 张建民[1,2] 侯文峻[3] 

机构地区：[1]清华大学岩土工程研究所,北京100084 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [3]住房和城乡建设部建筑节能与科技司,北京100835

出　　处：《地震工程与工程振动》2010年第6期154-161,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点基础研究发展计划(973)项目(2007CB714108);国家自然科学基金资助项目(50979046)

摘　　要：运用最新研制的80吨三维多功能土工试验机对工程中常用的粗粒土与结构接触面三维力学特性进行了研究,探讨了主要影响因素。结果表明:(1)接触面产生了明显的剪切体变;在往返型路径下可以分为可逆和不可逆两部分;(2)切向应力应变关系呈现显著的非线性特征,接触面在循环剪切时不断剪切硬化;(3)抗剪强度与法向应力呈良好的线性关系,可用摩尔-库伦准则描述;(4)法向应力、法向边界条件、切向控制方式、加载幅值、剪切路径等对接触面力学特性均有不同程度的影响。Using a new professional apparatus （3DMAS）, the 3D behavior of the interface between structure and gravelly soil widely used in practical engineering was studied, and the major influence factors were also discussed. The results indicate that： （1） the volumetric change of the interface is obviously observed due to shear application, and can be divided into reversible and irreversible components in two-way cyclic shear paths; （2） the relationship between shear stress and tangential displacement has nonlinear characteristics, and becomes hardenable due to cyclic shear; （3） the shear strength behaves well with normal stress acting on the interface in linear manner, which is in good accordance with the Mohr-Coulomb failure criteria; （4） the behavior is affected by stress and boundary condition in normal direction and control mode, shear amplitude, and shear path in tangential direction.

关 键 词：接触面 粗粒土 三维力学特性 影响因素 试验 

分 类 号：P315.98[天文地球—地震学] TU411[天文地球—固体地球物理学]