临近地铁车站超深基坑非常规支护方法的应用  

Application of an Unconventional Support Method in a Very Deep Excavation Adjacent to a Metro Station

作　　者：陈明 文建鹏 石伟民 CHEN Ming;WEN Jianpeng;SHI Weimin(Shenzhen Geotechnical Investigation&Surveying Institute Group Co.Ltd.,Shenzhen 518028)

机构地区：[1]深圳市勘察测绘院(集团)有限公司,广东深圳518028

出　　处：《土工基础》2022年第5期709-712,共4页Soil Engineering and Foundation

摘　　要：以深圳市某超深基坑工程为例,阐述了临近地铁一侧基坑采用预留土台盆式开挖方式,将基坑工程与地铁车站之间部分覆土挖除,整平至地铁车站负二层结构楼板位置,并以整平后的标高作为基坑坡顶预留土台,预留的土台区域待相邻主体结构施工完后采用逆作开挖土方的设计思路和施工工艺。结合有限元分析软件Midas/GTS NX计算结果和现场反馈的监测数据,可知将基坑与地铁车站之间一定厚度覆土挖除后再逆作开挖土方是可行的。研究成果可为类似临近地铁车站的项目提供指导或参考。This paper presents a case history of a very deep excavation near an active metro station in Shenzhen.The excavation supporting method design combined with the developer’s requirements for the construction schedule and cost of the project.Both design approaches and construction techniques of top-down excavation earthwork are provided in the paper.The soil in front of the excavated area that near the adjacent metro station was excavated to the floor elevation of the minus second story and reserve it until the completion of the nearby main structure.Then the top-down construction was used to complete the remaining soil removal.Combining results from the finite element analysis by using Midas/GTS NX software and the monitoring data during the construction,it is concluded that the excavation of the earthwork after removing a portion of overburden between the excavated area and the subway station is feasible.This project can provide guidance or reference for similar projects near subway stations.

关 键 词：预留土台 盆式开挖 逆作开挖 地铁车站 

分 类 号：TU473[建筑科学—结构工程]