隧道垂直交叠条件下盾构施工对上部既有隧道的影响  

The Effect of Shielding Construction on the Upper Existing Tunnel for Perpendicularly Crossing Tunnels

作　　者：郭小东[1] 曹宇春[1] 金炜枫[1] 杨建辉[1] Guo Xiaodong;Cao Yuchun;Jin Weifeng;Yang Jianhui(School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou 310023,China)

机构地区：[1]浙江科技学院土木与建筑工程学院,杭州310023

出　　处：《科技通报》2017年第2期209-213,共5页Bulletin of Science and Technology

基　　金：国家自然科学基金(40406019;51408547);浙江省公益技术应用研究项目(2014C33037);浙江省自然科学基金项目(LQ14E080009);浙江省新苗人才计划项目(2016R415038)

摘　　要：为分析下穿盾构隧道对既有上部隧道的影响,通过建立三维数值模型,用FLAC3D模拟了不同情况下隧道的轴力、剪力弯矩及上部隧道的位移,并进行了对比。通过研究发现:盾构隧道施工以交叠处对上部既有隧道影响最大;当新建隧道掌子面推进到离交叠处附近4倍左右洞径时,盾构施工对上部既有隧道的影响愈加明显;对隧道重叠区域土体进行加固可以有效地降低下穿盾构隧道对既有上部隧道的影响。本文的数值模拟结果可以为盾构下穿已建隧道的顺利实施提供参考。Three- dimensional numerical model using FLAC3D is established to analyze the effect of shielding construction on the upper existing tunnel for perpendicularly crossing tunnels. Axial forces,bending moments and displacements of the upper tunnel are correspondingly calculated. It is found that the effect of shielding tunnel construction on the upper existing tunnel is most pronounced in the crossing position of the two tunnels, and the effect increases gradually when the tunnel face is advanced near a distance of 4D (D is diameter of the shielding tunnel) from the crossing position; the effect can be diminished by improving the soil mass in the neighborhood of the crossing position. The numerical simulation results in the present paper could be a workable reference for the successful implementation of similar projects.

关 键 词：交叠隧道 盾构隧道 三维有限差分 旋喷桩加固 沉降 

分 类 号：TU921[建筑科学—建筑设计及理论]