大口径平行顶管施工对地表沉降的影响  

The influence of large diameter parallel pipe jacking on surface subsidence

作　　者：吴健 王其炎 陈建军 WU Jian;WANG Qiyan;CHEN Jianjun(Zhejiang Communications Construction Group Co.,Ltd.,Hangzhou 310051,Zhejiang,China)

机构地区：[1]浙江交工集团股份有限公司,杭州310051

出　　处：《隧道与地下工程灾害防治》2021年第4期68-74,共7页Hazard Control in Tunnelling and Underground Engineering

基　　金：浙江省自然科学基金资助项目(LHY19E090001)。

摘　　要：基于杭州下沙某电力管廊工程,采用三维有限元ABAQUS软件对平行顶管过程进行数值模拟,开展先后顶管错距以及泥水压力对土体沉降影响规律的研究。结果表明:最大沉降位于平行顶管中线正上方偏先行管处,后行管引起的沉降是先行管引起沉降的1.5倍;当泥水压力接近静止土压力时沉降最小;随着先行管与后行管错距的不断增大,土体沉降总体呈减小趋势,同时顶进产生的土体沉降约为分开顶进时的2倍,错距超过4.31倍管节外径后沉降变化不大。Based on a power pipe tunnel project in Xiasha,Hangzhou,3D finite element software ABAQUS was used to conduct numerical simulation of parallel pipe jacking process,the effects of successive pipe jacking staggered distance and mud-water pressure on soil settlement were studied.The maximum settlement was located directly above the center line of parallel pipe jacking and deviates from the leading pipe.The settlement caused by the descending pipe was 1.5 times that of the leading pipe;when the mud pressure was close to the static earth pressure,the settlement was the smallest;with the increasing of the staggered distance between the leading pipe and the descending tube,the soil settlement generally decreased.Meanwhile,the soil settlement generated by jacking was about 2 times as much as that generated by separate jacking.After the cross distance exceeded 4.31 times of the outside diameter of the pipe joint,the settlement had little change.

关 键 词：平行顶管 顶管错距 泥水压力 土体沉降 

分 类 号：U455.47[建筑科学—桥梁与隧道工程]