深孔注浆条件下地铁施工地层位移预测研究  

Study on Stratum Displacement Prediction Method Induced by Metro Construction under Deep Hole Grouting Condition

作　　者：王鑫[1] 罗富荣[2,3] 张飞 韩煊 Wang Xin;Luo Furong;Zhang Fei;Han Xuan(BGI Engineering Consultants Ltd.,Beijing 100038,P.R.China;Beijing MTR Construction Administration Corporation,Beijing 100068,P.R.China;Key Laboratory of Fully Automatic Operation And Safety Monitoring For Urban Rail Transit,Beijing 100068,P.R.China)

机构地区：[1]北京市勘察设计研究院有限公司,北京100038 [2]北京市轨道交通建设管理有限公司,北京100068 [3]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

出　　处：《地下空间与工程学报》2020年第5期1521-1528,共8页Chinese Journal of Underground Space and Engineering

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7号线工程为研究背景,首先,利用现场实测数据对深孔注浆预加固条件下,地铁暗挖施工引起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。其次对注浆加固圈厚度、加固圈等效变形模量、洞室开挖面积、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等参数对深孔注浆条件下地层变形的影响情况进行了因素分析,并在此基础上,提出了深孔注浆预加固条件下Peck理论方法关键参数的预测方法。另外,采用室内试验、数值试验以及理论研究相结合的方法,对深孔注浆复合体的变形和强度特性进行了系统分析,提出了注浆加固复合体等效压缩模量的数学模型,建立了注浆复合体数值计算模型参数的确定方法。以上工作可以为获得可靠的地表变形预测提供方法基础,同时可以为深孔注浆设计优化提供借鉴。The Beijing Metro Line 7 project was researched. First,by using the field measured data,including the ground subsidence characteristics,the stratum loss rate and the width coefficient of the subway underground construction under the condition of pre-reinforcement by deep-hole grouting were inversely analyzed. Second,the influence factor analysis of grouting reinforcement thickness,equivalent deformation modulus of reinforcement ring,excavation area,weighted deformation modulus of excavation surface stratum,overlying soil thickness,weighted deformation modulus of overlying soil on deformation control under deep-hole grouting were carried out. The prediction method for key parameters of Peck theory under deep hole grouting pre-reinforcement condition was proposed. In addition,the deformation and strength characteristics of deep-hole grouting composite were systematically analyzed using laboratory test,numerical test and theoretical research. The model of equivalent compressive modulus of grouting reinforced composite was presented,and the numerical calculation model parameters valuation scheme of grouting composite was established. The reliable basis for predicting surface deformation and the reference for optimization of deep-hole grouting design can be provided.

关 键 词：深孔注浆 地铁施工 地层位移 因素分析 预测方法 

分 类 号：TU43[建筑科学—岩土工程]