摘要
传统的基坑支护结构内力和变形通常采用断面法进行设计计算,该方法不能考虑结构的整体效应和围岩的共同变形,计算结果偏于保守。本文以长沙某基坑及地连墙支护结构为研究对象,在考虑结构的整体效应及与围岩的共同变形作用基础上,采用有限元计算了不同地连墙厚度下的结构内力及变形特征,在此基础上得到了最优设计方案。计算结果表明,0.8 m厚度地连墙的结构变形(竖向沉降变形和水平位移)均能满足规范安全要求,但地连墙厚度由1.2 m减小至0.8 m,可以使得混凝土和钢筋用量分别减小33.3%和22.5%;对结构进行了安全性与经济性评价表明,本文提出的最优方案不仅能够满足规范要求,而且在现有总工造价费用基础上缩减12.4%。
The section method is usually adopted in the traditional design and calculation of internal force and deformation of foundation pit supporting structure,which does not consider the overall effect of the structure and the common deformation with surrounding rock,and the calculation result is conservative.In this paper,taking the foundation pit and diaphragm wall supporting structure of a project in Changsha as the research object,on the basis of considering the overall effect of the structure and the deformation of the surrounding rock,the finite element method is used to calculate the internal force and deformation characteristics of the structure under different thickness of the diaphragm wall.The calculation results show that the structural deformation(vertical settlement deformation and horizontal displacement)of the 0.8 m thick diaphragm wall still meets the safety requirements of the code,but the thickness of the diaphragm wall is reduced from 1.2 m to 0.8 m,and the amount of concrete and reinforcement is reduced by 33.3%and 22.5%respectively,reducing the total project cost by more than 12.4%compared with the original design.The optimal design scheme based on the research results can greatly save the project investment on the premise of meeting the requirements of the specification.
作者
李鹏飞
LI Pengfei(The 5th Engineering Co.,Ltd.of China Railway 14th Bureau Group,Jining Shandong 272100,China)
出处
《铁道建筑技术》
2022年第7期152-156,共5页
Railway Construction Technology
基金
山东工信厅第一批技术创新项目计划(202150800078)。
关键词
基坑
支护结构
地连墙
变形特征
整体效应
foundation pit
supporting structure
underground diaphragm wall
deformation characteristics
overall effect
