明挖与盖挖结合法对地铁车站基坑支护结构变形影响研究  

Research on Structure Deformation of Deep Foundation Excavation Supports of Subway Station Combining Open-cut and Cover-dig Method

作　　者：郭洋洋 有智慧[1] 王正振[2] 陶津 GUO Yangyang;YOU Zhihui;WANG Zhengzhen;TAO Jin(Guangzhou Metro Co., Ltd., Guangzhou, Guangdong 510000, China;Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University,Nanjing, Jiangsu 210096, China)

机构地区：[1]广州地铁设计研究院有限公司,广东广州510000 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《施工技术》2019年第13期94-99,共6页Construction Technology

基　　金：国家重点研发计划资助(2017YFC0805500)

摘　　要：以成都地铁5号线青羊宫站基坑工程为研究对象,利用有限元软件对该明挖与盖挖结合车站基坑开挖过程进行数值模拟,研究了支护结构变形和地表沉降情况,分析盖挖对基坑的影响,并利用现场实测数据对模拟结果进行验证。结果表明:本次模拟结果与现场实测结果较为接近;当盖板连接基坑两侧支护结构时,盖板起到支撑作用,由于盖板刚度较大,故支撑效果更好,其对支护结构变形和地表沉降均起到抑制作用,但由于盖板自重及上部荷载均传递给基坑支护结构,而支护结构本身是水平被动桩,故在设计过程中应考虑其竖向承载力。Based on the foundation excavation of Qingyanggong subway station of Chengdu Metro line 5,which is a combination of open-cut and cover-dig method,PLAXIS3D was used to simulate excavation process,deformations of supporting structure and surroundings around deep excavation,which were verified by the field measured data and studied and the influence of the cover digging on the foundation excavation were analyzed. The results showed that,simulation results are close to the field test results,cover plate that has a larger stiffness could be treated as a layer of inner support when the cover plate connected both sides of foundation excavation and can decrease deformations of supporting structure and surroundings effectively. However,since the self-weight and the upper load of the cover plate were transmitted to the foundation excavation supporting structure,the supporting structure was not only under horizontal earth pressure,but also under vertical load,which should attracts attentions of designer.

关 键 词：地铁车站 基坑 支护 数值模拟 变形 监测 

分 类 号：TU47[建筑科学—结构工程]