基于冗余度的基坑支护体系数值模拟和优化设计  

NUMERICAL SIMULATION AND OPTIMIZATION DESIGN OF FOUNDATION PIT SUPPORT SYSTEM BASED ON REDUNDANCY

作　　者：刘畅[1,2] 李文杰[1] 郭德强[1] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《建筑技术》2016年第9期781-784,共4页Architecture Technology

基　　金：国家自然科学基金项目(51108312)

摘　　要：目前基于构件设计的基坑设计理论造成很多支护体系缺乏必要的冗余度,导致发生倒塌事故。基于基坑水平支撑系统的冗余度,利用PLAXIS三维有限元软件对基坑工程支护体系进行数值模拟,研究基坑水平支撑系统发生局部损伤对整个基坑的空间影响,分析土体的竖向位移、地下连续墙的变形及其刚度敏感度,据此提出考虑冗余度的竖向支挡结构优化设计。The conventional design method of foundation pit support system is based on the element design. Consequently, a lot of retaining structures are lack of essential redundancy, which led to many catastrophic collapse accidents of foundation pit. On the basis of redundancy of support system, PLAXIS 3D finite element software is used to simulate the foundation pit support system. The spatial effect of support system local damage on the whole foundation pit is studied. The vertical displacement of soil, deformation and stiffness sensitivity of underground diaphragm wall are analyzed. Optimization design of vertical retaining structure considering redundancy is proposed accordingly.

关 键 词：基坑 冗余度 数值模拟 优化设计 

分 类 号：TU753[建筑科学—建筑技术科学] TU201.4