考虑级配效应的粒状材料本构模拟  

Constitutive modeling for granular materials considering grading effect

作　　者：刘映晶[1,2,3] 王建华[1] 尹振宇[1,2] 李罡 夏小和[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院土木工程系,上海200240 [2]南特中央理工大学土木与力学学院,法国南特44300 [3]上海市隧道工程轨道交通设计研究院,上海200235 [4]济南轨道交通集团有限公司,山东济南250101

出　　处：《岩土工程学报》2015年第2期299-305,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41372285;41272317;41172251);高等学校博士学科点专项科研基金项目(20110073120012);中法联合基金项目(RISMOGEO)

摘　　要：粒状材料被广泛应用于岩土工程中,其颗粒级配变化特性会影响材料的力学性能特别是承载力特性。为了更好地描述级配对粒状材料力学性能的影响,基于弹塑性力学和临界状态土力学,将依赖颗粒级配的临界状态线引入到一个简单的本构模型中。应用此模型来模拟不同粒状材料(DEM理想球体、人工材料玻璃球和天然砂土Hostun砂)的三轴排水/不排水实验。结果表明:此模型仅采用一组级配相关的临界状态参数就可以统一描述不同颗粒级配粒状材料的力学响应。The granular materials are widely used in geotechnical engineering, whose grading changing feature will affect their mechanical behavior obviously, especially the bearing capacity. In order to well describe the influence of grain-size distribution on the mechanical behavior of granular materials, a simple constitutive model taking into account the grading-dependent critical state line is developed within the framework of elasto-plasticity and the critical state theory. The model is used to simulate the drained and undrained triaxial compression tests on different types of granular materials(DEM ideal sphere, artificial material glass ball and natural material Hostun sand). It is found that only one group of grading-dependent critical state parameters is needed for describing the mechanical response of granular materials with different gradings.

关 键 词：颗粒级配 粒状材料 本构模型 临界状态 

分 类 号：TU43[建筑科学—岩土工程]