盾构隧道工作井深基坑围护结构设计优化分析  

Optimal Design Analysis on the Retaining Structure of Shield Work Shaft Excavation

作　　者：程池浩 廖少明[1] 潘学政[2] 刘靖[3] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]杭州市公路管理局,杭州310030 [3]天津城建设计院,天津300073

出　　处：《地下空间与工程学报》2016年第5期1300-1307,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51378389);国家重点基础研究发展计划(973计划)(2015CB057806);上海市科技创新行动计划(16DZ1200202)

摘　　要：基坑工程设计需要满足安全、经济、可持续等各方面要求,本文以杭州地区某盾构隧道超深工作井深基坑工程为基础,采用有限元分析软件Plaxis进行数值模拟,分析了地下连续墙的插入比,地下连续墙的厚度,地下连续墙支撑道数和土体加固深度对基坑稳定性、地表沉降、支撑轴力、墙体位移及墙体内力的影响,得到以下结论：（1）最优地下连续墙插入比范围为0.8~1.0;（2）优化后地下连续墙厚度可取0.9~1.1 m之间;（3）支撑道数的优化建议采用6道支撑;（4）坑底加固深度以4 m为宜。The design of deep excavation needs to meet the requests of various aspects,such as safety,economic,sustainability and so on. Based on a shield work shaft excavation engineering in Hangzhou area,a series of parametric studies were performed with the finite element analysis software Plaxis to investigate the effect of some main factors on the stability of excavation,surface settlement,strut axial forces,displacement and internal forces of diaphragm walls. These main factors include reinforcement depth and its insert ratios、the thickness and the number of inner support of diaphragm walls. On the basis of the numerical analysis results,Some major findings were obtained：（ 1） the optimized penetration ratio of diaphragm wall is between 0.8 and 1.0;（ 2） the optimized thickness of diaphragm wall is between 0.9 and 1.1meters;（ 3） the optimal number of inner support is 6;（ 4） the optimal reinforcement depth of soil is 4 meters.

关 键 词：深基坑 优化 数值分析 变形控制 

分 类 号：U451[建筑科学—桥梁与隧道工程]