内墙插入比对坑中坑基坑变形影响的敏感性分析  

SENSITIVITY ANALYSIS OF INFLUENCE OF INTERNAL WALL INSERTION RATIO ON DEFORMATION OF PIT IN PIT

作　　者：侯新宇[1] 薛必芳[1] 刘娟[1] 火映霞[1] 

机构地区：[1]江苏开放大学建筑工程学院,南京210036

出　　处：《建筑技术》2017年第3期282-284,共3页Architecture Technology

基　　金：江苏省高校自然科学研究面上项目(14KJB560004);江苏省"六大人才高峰"项目(2014JZ010);江苏省"青蓝工程"项目

摘　　要：以苏州某地铁换乘站坑中坑为基本模型,采用土体卸载条件下的HS有限元模型,系统研究了内墙插入比对坑中坑基坑支护结构和基坑土体变形的影响。结果表明:外墙侧移受内墙插入比影响甚微,除内墙插入比0.25时出现踢脚破坏外,内墙墙身、墙顶侧移随内墙插入比增大而增大,而内墙墙脚趋势相反。内坑底在距内墙10m附近出现显著隆起区,最大隆起量在96~99mm范围内并不受插入比影响,但隆起范围随插入比增大而增加;在显著隆起区外,内坑隆起量稳定在90mm,且不受插入比影响。外坑坑底隆起和外坑坑背沉降受内墙插入比影响较小。Adopting Hardening-Soil finite element model based on Unloading, the influence of the internal wall insertion ratio on the retaining structure and the deformation of the excavation was studied based on the basic model of the pit of a metro transfer station in Suzhou.The results show that the lateral deformation of external wall has been affected slightly by internal wall insertion ratio, except for the baseboard failure with insertion 0.25, that of internal wall and bottom increase with insertion ratio growing with the opposite trend of internal wall bottom. Significant uplift area appear about 10m near the internal wall with the maximum uplift 96-99mm, which has not been affected by insertion ratio, but the uplift area increase with insertion ratio growing. The uplift maintain 90mm at outside of significant uplift area without influence of insertion ratio. The bottom uplift and ground settlement of external excavation have been less affected by the insertion ratio.

关 键 词：内墙插入比 变形影响 敏感性分析 HS模型 

分 类 号：TU753[建筑科学—建筑技术科学]