粗粒土与结构接触面受载过程中的损伤  

LOAD-INDUCED DAMAGE OF THE INTERFACE BETWEEN STRUCTURE AND COARSE GRAINED SOIL

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

出　　处：《力学学报》2004年第3期322-327,共6页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(50279015);北京市自然科学基金重点资助项目(8011002).~~

摘　　要：进行了粗粒上与结构接触面单调和循环加载试验,基于宏细观测量结果,扩展了损伤概念以描述该类接触面在受载过程中的物态演化,及由于物态演化导致的力学特性从初始状态到最终稳定状态的连续变化过程.揭示了接触面损伤的细观物理基础主要是接触面内土的颗牲破碎和剪切压密这两种物态演化;指出接触面的剪胀体应变可以划分为可逆性和不可逆性剪胀体应变两部分,其中不可逆性剪胀体应变可作为接触面损伤发展的宏观量度,因此其归一化形式可作为一种损伤因子的定义;提出了建立粗粒土与结构接触面一种损伤本构关系的基本思路.The monotonic and cyclic behavior of the interface between structure and coarse grained soil was investigated through test study in both macroscopic and microscopic way. The internal relationship between micro-physical state change and macro-mechanical response is discovered through analyzing the observation results of the interface. The concept of damage is therefore extended to characterize the evolution of the physical states as well as resulting evolution of the behavior of the interface between structure and coarse grained soil, which develops continuously from the initial state to the ultimate state. The evolution of the physical states mainly consists of the crushing and compression of soil particles near the structure. The volumetric strain due to dilatancy of the interface could be divided into reversible and irreversible dilatancy component, in which the irreversible dilatancy component could essentially indicate the evolution of the physical states as well as the behavior of the interface. The irreversible volumetric strain due to dilatancy is then demonstrated as a measurement of the damage extent of the interface, which could be normalized as damage variable. Finally, a new scheme is presented to constitute a damage model of the interface between structure and coarse grained soil.

关 键 词：粗粒土 接触面 不可逆性剪胀体应变 细观测量 本构模型 损伤 土动力学 

分 类 号：TU432[建筑科学—岩土工程]