直径9m级盾构施工引起的地层位移预测方法研究  

Prediction of Ground Deformation Method Induced by Shielded Tunneling with a 9.0-Meter TBM

作　　者：罗富荣[1,2] 王鑫 李元凯[1,2] 韩煊 LUO Furong;WANG Xin;LI Yuankai;HAN Xuan(Beijing Metro Construction Administration Co.Ltd.,Beijing 100068;Key Laboratory of Fully Automatic Operation and Safety Monitoring for Urban Rail Transit,Beijing 100068;BGI Engineering Consultants Ltd.,Beijing 100038)

机构地区：[1]北京市轨道交通建设管理有限公司,北京100068 [2]城市轨道交通全自动运行系统与安全监控北京市重点实验室,北京100068 [3]北京市勘察设计研究院有限公司,北京100038

出　　处：《土工基础》2020年第5期541-545,共5页Soil Engineering and Foundation

基　　金：科技北京百名领军人才培养工程(Z171100001117146);北京市百千万人才工程资助项目(2017A31)。

摘　　要：以北京地铁大兴机场线工程为背景,利用现场实测数据,对直径9 m级中型盾构暗挖施工引起的地表沉降特性及其地层损失率、沉降槽宽度系数进行了反演分析,并对地层条件(开挖面地层加权变形模量、上覆土厚度、上覆土加权变形模量)以及盾构施工参数(土仓压力、贯入度、注浆压力及注浆量等)对直径9 m级盾构施工引起的沉降及其特征参数的影响情况进行了因素分析,在此基础上,提出了直径9 m级盾构施工条件下Peck理论方法关键参数的快速预测方法。研究成果可为直径9 m级地铁盾构施工引起地表变形预测提供方法基础,同时可为直径9 m级地铁盾构的设计与施工优化提供借鉴。This paper presents a case history of deformation prediction methods for the ground deformations induced by the shielded tunneling with a 9.0-meter diameter Tunnel Boring Machine(TBM)in a metro line construction of the Beijing Daxing International Airport.The ground subsidence characteristics,strata loss ratio,and the coefficient of ground subsidence trough width were back analyzed using 30 sets of monitored data.In addition,influence factors,such as,geological conditions that including weighted deformation modulus of the excavation surface stratum,overlying soil thickness and equivalent deformation modulus of overlying stratum and the shield construction parameters such as,soil pressures,distance of excavation,grouting pressures and grouting volumes on stratum deformation,as well as their characteristic parameters caused by the shielded tunneling with a 9 mdiameter TBM are performed.A prediction method using key parameters of Peck Theory for the 9 m-diameter TBM is proposed.The data back analysis provides the basis for a reliable method for predicting the surface deformation.

关 键 词：盾构 地铁施工 地层位移 因素分析 预测方法 

分 类 号：U456[建筑科学—桥梁与隧道工程]