富水地层盾构掘进引起地铁隧道地表沉降规律研究  

Research on Metro Tunnel Formation Subsidence Pattern Caused by Shield Tunneling in Water-rich Stratum

作　　者：韩文君 严红霞[2] 欧建军 HAN Wenjun;YAN Hongxia;OU Jianjun(Changzhou Rail Transportation Development Limited Company,213022,Changzhou,China;不详)

机构地区：[1]常州市轨道交通发展有限公司,常州213022 [2]常州工程职业技术学院建筑工程学院,常州213164

出　　处：《城市轨道交通研究》2020年第8期31-34,39,共5页Urban Mass Transit

基　　金：住房和城乡建设部科学技术项目(2018-K4-008);江苏省建设系统科技项目(2018ZD200);江苏省大学生创新创业训练计划项目(201913102025Y)。

摘　　要：以常州地铁1号线工程为依托,对盾构隧道施工过程中的盾构掘进参数和地表沉降监测结果进行分析,得到了常州地区典型土层情况下盾构施工引起的沉降量、地层损失率、沉降槽宽度系数变化规律,并分析了隧道埋深、拱顶覆土、注浆参数等对地表沉降规律的影响。研究结果表明:盾构掘进引起的地表沉降曲线符合Peck曲线,平均沉降值在10 mm以内,平均地层损失率为0.68%;地表最大沉降量随隧道埋深的增大而减小;隧道拱顶覆土为粉质黏土时的地表沉降和地层损失率明显大于拱顶覆土为粉砂;地表最大沉降量、地层损失率均随着同步注浆量、土仓压力增加而减小,但是沉降槽宽度系数随之增大,且拱顶覆土为粉砂时较粉砂夹粉土变化更显著。Based on Changzhou metro Line 1 project,the monitoring results of shield tunneling parameters and ground subsidence during tunnel construction are analyzed,the changing law of settlement,formation loss rate and width coefficient of settlement tank caused by shield tunnel construction in the typical stratum area of Changzhou City are summarized,the influencing factors of tunnel depth,dome soil,grouting parameters on surface settlement are analyzed.The results show that the surface settlement curve caused by shield tunneling accords with the Peck curve,the average settlement value is within 10 mm,and the average formation loss rate is 0.68%;the maximum settlement value of the surface decreases with the increase of the tunnel buried depth;the settlement and formation loss rate of tunnel arch covered with clay is obviously larger than that covered with silt;with the increase of synchronous grouting and soil pressure,the maximum settlement of the ground surface and formation loss rate decreases,but the width coefficient of settlement tank increases.The changes are more significant in tunnel arch covered with clay than those in tunnel arch covered with silt.

关 键 词：盾构隧道 地表沉降 地层损失率 沉降槽宽度 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]