基于Boussinesq应力解和位移解的复合地基沉降可靠度分析  

RELABILTY ANALYSIS ON COMPOSITE FOUNATION SETTLEMENT BASED ON BOUSSINESQ'S STRESS AND DISPLACEMENT SOLUTION

作　　者：丁继辉[1] 袁满[1] 王岩[2] 

机构地区：[1]河北大学机械与建筑工程学院,保定071002 [2]河北唐山市交通局,唐山063000

出　　处：《工程力学》2011年第A01期35-39,共5页Engineering Mechanics

基　　金：河北省住房和城乡建设厅项目(2008-110);河北省自然科学基金项目(E2011201057)

摘　　要：将复合地基的加固区和下卧层作为一个整体,加固区视为压缩模量为复合模量的天然地基,按天然地基的分层总和法计算复合地基沉降。以竖向荷载作用下Boussinesq应力解和位移解为基础,建立了复合地基沉降量的可靠度分析模型。并结合工程实例对复合地基沉降量的可靠指标的影响因素进行了分析。考虑复合地基变形可靠度分析中,功能函数的高度非线性且包含有积分项,采用验算点法较蒙特卡洛法困难,蒙特卡洛法不用计算功能函数的偏导数,不受功能函数非线性和数值积分的限制。The reinforced area and non-reinforced area of a composite foundation are regarded as a whole,the reinforced area is taken as a natural foundation whose compression modulus equals as a composite modulus;the settlement of the composite foundation is computed by means of the layering summation method of a natural foundation.The models for the reliability analysis on the composite foundation settlement based on the Boussinesq＇s stress and displacement solution under a vertical concentrated load is established.The effect factors on the reliability index of the composite foundation settlement are analyzed through an engineering example.Considered the function＇s non-linear and included integral term,the reliability index computation is difficulty by the checking point method then by Monte-carlo method.Monte-carlo method does not deal with the computation of partial derivatives,and the limit of the function＇s non-linear and numerical integral.

关 键 词：复合地基 Boussinesq应力解 Boussinesq位移解 可靠度指标 验算法 蒙特卡洛法 

分 类 号：TU433[建筑科学—岩土工程]