基坑围护结构的内力和变形的预测方法研究  

Innovated forecasting method for internal force and displacement of supporting structures

作　　者：王强[1] 程群[2] 庞建勇[1] 刘芳玲[2] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]中建四局第六建筑工程有限公司,合肥230011

出　　处：《安全与环境学报》2015年第2期116-119,共4页Journal of Safety and Environment

基　　金：安徽省高校优秀青年基金项目(2011SQRL045);中建四局项目(CSCEC-2013-Z-10);安徽理工大学第三批中青年骨干教师中国博士后基金项目(2014M561806)

摘　　要：为了利用土体水平抗力系数的比例系数m来有效预测基坑围护结构的内力和变形,依据弹性地基梁原理,利用大型数学软件MATLAB编制了计算程序,对基坑围护结构的内力和变形进行预测,并依托某深基坑工程围护结构的实测内力和变形数据对预测的内力和位移进行了验证。结果表明,根据弹性地基梁原理预测的基坑围护结构内力和变形随基坑开挖的变化与实测结果吻合较好。This paper is aimed to propose an innovated method for forecasting the internal force and displacement of the supporting struc- tures in civil engineering projects. For our research purpose, we have adopted the elastic foundation beam method, known as m-method, which has a lot of merits such as easy calculation pattern and definite model. Though the calculation process of the elastic foundation beam deflection equation is more complicated, the said m-method can easi- ly be made suitable for forecasting the internal force and the displace- ment of the construction structure by means of the proportional coeffi- cient of the level of soil resistance coefficient values （ m）. In order to solve the problem it has to face, first of all, we have established the complicated model based on the elastic foundation beam, by introduc- ing the construction process of excavation and supporting technology into the common constructive process. Secondly, we have solved the fourth order ordinary differential equation in our complicated calcula- tion model. Thirdly, while the boundary conditions are given for the fourth order of the said differential equation, the computing program can be easily programmed via a MATLAB mathematical software, as is shown by the method of elastic foundation beam and the boundary conditions. And, fourthly, in order to verify the feasibility of the method, we have managed to ＂apply the program to the forecasting of the internal force and the displacement of the deep foundation pit. With the said method, we have made a comparison between the law of displacement and the bending moment by forecasting and examining the measured data of the supporting structure during the time of exca- vation. The results of our comparison show that the internal force and the displacement of the supporting structure in the foundation pit can be forecasted by using the elastic foundation beam method. In addi- tion, the results we have measured turn to be well in accord with those of the actual excavation. Thus, the metho

关 键 词：安全工程 弹性地基梁 MATLAB解法 内力和变形 

分 类 号：X947[环境科学与工程—安全科学] TU375.4[建筑科学—结构工程]