不同施工工序对于基坑围护结构及土体变形的影响  

Influence of Different Construction Procedures on Foundation Pit Retaining Structure and Soil Deformation

作　　者：李学东[1,2] 许祺 张益 李益斌 唐强[3] 孙俊芳 LI Xue-dong;XU Qi;ZHANG Yi;LI Yi-bin;TANG Qiang;SUN Jun-fang(Jiangsu Suzhou Geological Engineering Survey Institute,Suzhou Jiangsu215011 China;The Fourth Geological Brigade of Jiangsu Geological and Mineral Bureau,Suzhou Jiangsu215004 China;Soochow University,Suzhou Jiangsu215131 China)

机构地区：[1]江苏苏州地质工程勘察院,江苏苏州215011 [2]江苏省地质矿产局第四地质大队,江苏苏州215004 [3]苏州大学,江苏苏州215131

出　　处：《江苏建筑》2022年第2期102-106,共5页Jiangsu Construction

基　　金：国家自然科学基金项目(52078317);江苏省自然科学基金(优秀青年基金项目)(BK20211597);江苏省自然科学基金项目(BK20210720);江苏省高等学校自然科学研究面上项目(19KJ11580018);江苏省地质矿产勘查局科技项目(2021KY06);苏州市建设系统科研项目(2021-25,2021ZD02,2021ZD30);中交隧道工程局有限公司科技项目(8gs-2021-04);中交一公局有限公司科技项目(KJYF-2021-B-19);中铁四局科研开发计划项目(2021-19)。

摘　　要：对于复杂情况基坑,不同的开挖工序会对土体和围护结构造成不同的影响。文章以苏州市某基坑项目为研究背景,利用有限元软件构建三维模型,分析了在不同施工工序下基坑的变形情况。结果表明,在先开挖主线隧道基坑的情况下,土体的最大变形显著大于同步骤下的其它工序。最大的基坑底鼓为5.92 cm,最大的桩体水平位移为2.69 cm,发生在桩顶面下12 m处,最大地表沉降为8.32 mm;先开挖人非隧道和同时开挖的方案可以减少施工对土体变形和围护结构的影响。For complex excavation,different excavation procedures have different impacts on soil and retaining structure.Taking a foundation pit project in Suzhou as the research background,this paper used finite element software to build a three-dimensional model and analyzes the deformation of the foundation pit under different construction procedures.The results show that the maximum deformation of soil under the condition of excavation of the main tunnel foundation pit is significantly larger than that under the same procedure.The maximum foundation pit heave is 5.92 cm,the maximum horizontal displacement of pile is 2.69 cm,which occurs 12 m below the pile top surface,and the maximum surface settlement is 8.32 mm.The influence of excavation on soil deformation and retaining structure can be reduced by excavating tunnel first and simultaneously.

关 键 词：有限元 深基坑 围护结构 施工工序 土体变形 

分 类 号：TU463[建筑科学—结构工程]