基于含水率的某深基坑持力层粉土弹塑性本构模型研究  

The Study of Elastoplastic for Silty in Some Deep Foundation Pit Based on Changes of Moisture Content

作　　者：邢国起[1,2] 肖洪天[1] 

机构地区：[1]山东科技大学山东省岩土与结构工程重点实验室,青岛266590 [2]潍坊学院建筑工程学院,潍坊261061

出　　处：《科学技术与工程》2014年第19期112-116,121,共6页Science Technology and Engineering

基　　金：国家自然科学基金项目(51379118)资助

摘　　要：通过对潍坊中南部平原地区某深基坑持力层粉土进行三轴不排水试验,结合Lade-Duncan弹塑性模型,确定了粉土的弹塑性应力-应变模型及其参数。分析了试验参数随含水率变化的规律性。建立了弹性功we与塑性功wp在不同含水率时的关系。确定了dλ、k2基于含水率的数学拟合表达式。采用建立的粉土弹塑性模型进行了竖向应变ε1的计算,并与试验值进行了比较,取得了较为满意的结果。粉土弹塑性模型的建立可为该地区粉土地基变形计算创造有利条件。The elastic-plastic model for silty in some deep foundation pit at the plain area of south-central Weifang is studied through the triaxial test with combining the Lade-Duncan elastoplastic model.The experiment parameters is analysised with the changing of water content.The relationship between resilience work of deformation and plastic work is detemined with the changing of water content,mathematical expressions of experiment parameters dλ and k2 under the conditions of different water content is established.Satisfied results is achieved through the comparison between calculated results and test results by using the elastoplastic model of silty.The elastoplastic model of silty can calculate the foundation deformation of silty for the region of south-central Weifang.

关 键 词：粉土 Lade-Duncan弹塑性模型 含水率 试验参数 

分 类 号：TU433[建筑科学—岩土工程]