“中心岛法”斜支撑基坑开挖坡比对周边环境的影响  

INFLUENCE ON SURROUNDING ENVIRONMENT OF DEEP EXCAVATION OF DIFFERENT GRADIENT SLOPE APPLYING THE CONSTRUCTION OF CENTRAL ISLAND WITH INCLINED BRACE

作　　者：徐德馨[1] 唐传政[2] 彭汉发[1] 张杰青[1] 施木俊[1] 

机构地区：[1]武汉市勘测设计研究院,武汉430022 [2]武汉市建设工程设计审查办公室,武汉430015

出　　处：《工业建筑》2009年第S1期701-704,共4页Industrial Construction

基　　金：武汉市建委科研课题(200722)

摘　　要：采用三维有限元分析方法,对武汉某基坑"中心岛法"开挖施工过程进行模拟,分析开挖过程中支护结构水平位移和基坑周边地表沉降的变化过程,为基坑初步设计和优化设计提供参考。在同一地层和支护布设情况下,采用不同坡比开挖对基坑支护结构水平位移及周边地表沉降的影响进行研究。研究结果表明:随着斜坡开挖坡度的增加,斜坡开挖前后支护结构水平位移和基坑周边沉降不断增加,且增大的幅度越来越大;针对不同的基坑场地和周边环境情况,选取合理的斜坡比,对控制基坑开挖对周边环境的影响以及缩短基坑工期等有很好的作用,从基坑工期和安全性综合考虑得出武汉一级阶地一般情况较合适的开挖坡比为1∶1。Through 3D finite element analysis method,the construction course of some foundation excavation applying construction of central island in Wuhan is simulated,it is analyzed that the changing course of horizontal displacement of supporting system and settlement curves of surrounding surface by excavation,in order to provide reference for preparatory and optimized design of foundation excavation. In the same circumstances of soil stratum and supporting system arrangement,influence on horizontal displacement of supporting system and settlement curves of surrounding surface of different gradient slope is analyzed,study results show that: with the gradient of slope increases,horizontal displacement of supporting system and settlement of surrounding surface before and after slope excavation increase,also the rate of increase increases;according to different conditions of foundation excavation and surrounding environment,selecting a reasonable slope gradient has a very good effect on controlling the impact on surrounding environment and reducing the excavation period.Comprehensive consideration of time limit and safety of excavation,commonly the appropriate slope is 1∶1 in the first terrace in Wuhan.

关 键 词：基坑开挖 “中心岛法” 斜支撑 三维有限元分析 修正剑桥模型 

分 类 号：TU473[建筑科学—结构工程]