机械法联络通道T接施工地层隆沉变化特征研究——以无锡地铁3号线顶管法联络通道T接施工示范工程为例  

Study on influence of ground settlement in T-joint connecting passage with mechanical Pipe Jacking method:With the example of the demonstration project of T-joint construction of connecting passage with pipe jacking method in Wuxi Metro Line 3

作　　者：卫佳莺 马永政[2] 莫振泽 郦亮 靳永福 丁謇 WEI Jiaying;MA Yongzheng;MO Zhenze;LI Liang;JIN Yongfu;DING Jian(Wuxi Metro Group Co.,Ltd.,Wuxi 430071,Jiangsu,China;Ningbo University of Technology,Ningbo 315211,Zhejiang,China;Ningbo Rail Transit Co.,Ltd.,Ningbo 315010,Zhejiang,China)

机构地区：[1]无锡地铁集团有限公司,江苏无锡430071 [2]宁波工程学院,浙江宁波315211 [3]宁波市轨道交通集团有限公司,浙江宁波315010

出　　处：《隧道建设（中英文）》2020年第S02期136-143,共8页Tunnel Construction

基　　金：浙江省基础公益研究计划项目(LGF19E080004)。

摘　　要：为研究地铁联络通道机械顶管法T接施工对周围环境的影响,依托无锡地铁3号线联络通道施工工程开展现场监测,同时结合理论计算探讨施工影响下的地层隆沉变化规律。通过在联络通道周围地面布置圆形监测网点实施监测,结果表明:1)地面横向断面沉降中间大两侧小,且受主隧道倾斜度等影响,联络通道两侧位移变化对称性差;2)纵向断面上沉降中间有凹槽但正中央有相对凸起,可能与地面绿化带有关,施工推进前方略有抬升。基于数值模拟分析,对比验证上述特定工况下地面的隆沉变化规律,并进一步通过数值试验,模拟前期主隧道施工和后续联络通道施工的全过程,探讨不同顶推力因素对地面隆沉的影响效果,表明切削顶推力越大,施工前方隆起越明显。理论上建立了纵横方向上分别叠加Peck曲线的全周期沉降位移模型,该模型所描述的横断面沉降槽特征与上述施工全过程的数值解相似,但纵断面沉降特征有待进一步验证。总体上该工法对地面隆沉影响小,施工安全可控。In order to study the influence of T-joint connecting passage construction with mechanical pipe jacking method on surrounding environment,field monitoring and theoretical calculation analysis are carried out based on the project of Wuxi Metro Line 3,and the variation law of stratum settlement is investigated.Circular monitoring points are set on the ground around the connecting channel,and the monitoring results show that:(1)The ground surface transverse settlement is large above the center position of the passage but small aside,and the transverse displacement variation is asymmetric due to the influence of main tunnel inclination etc.;(2)The ground surface longitudinal settlement forms a groove in the middle and a relative bulge in the center possibly due to the road green belt,and the ground surface rises slightly along construction direction.Based on the numerical simulation analysis,the variation law of ground surface uplift and subsidence under the above specific conditions is verified,furthermore,through numerical experiments,the whole process of the construction of the main tunnel in the early stage and the subsequent connection channel is simulated.The effects of different jacking forces on ground surface uplift and subsidence are discussed,which shows that,the larger the jacking force is,the more obvious the uplift is in front of the construction.In theory,a full period settlement displacement model with peck curve superimposed on the vertical and horizontal directions is established.The characteristics of the transverse settlement trough described by the model are similar to the numerical solution of the whole construction process mentioned above,but the longitudinal settlement characteristics are not similar,which need to be further verified.On the whole,the construction method has slight influence on the ground settlement displacement,and the construction safety is controllable.

关 键 词：地铁联络通道 T接施工 顶管法 地面沉降 监测 数值分析 沉降位移模型 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]