Three-dimensional hydro-mechanical coupling numerical simulation of shield-driven cross-river twin tunnels:A case study  

作　　者：Chengwen Wang Xiaoli Liu Danqing Song Enzhi Wang Guohui Yan Ran Zhou 

机构地区：[1]Department of Hydraulic Engineering,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China [2]YSD Rail Transit Construction Company Limited,Guangzhou 510630,China

出　　处：《Underground Space》2024年第3期106-125,共20页地下空间（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52090081 and 52079068);the State Key Laboratory of Hydroscience and Hydraulic Engineering(Grant No.2021-KY-04).

摘　　要：With the rapid development of urban underground space,the construction of shield-driven cross-river twin tunnels is increasing,and the complex hydro-mechanical coupling effects and twin-tunnel interactions bring huge construction risks to such projects,which have attracted more and more attention.This study aims to understand the excavation effects induced by shield driving of cross-river twin tunnels through numerical simulation.A refined three-dimensional numerical model based on the fully coupled hydro-mechanical theory is established.The model considers the main components of the slurry pressure balance shield(SPBS)machine,including support force,jacking thrust,grouting pressure,shield-rock interaction and lining-grouting interaction,as well as the detailed construction process.The purpose is to examine the excavation effects during construction,including rock deformation around tunnels,the change in pore pressure,and the response of the lining.The results show the influence range of twin-tunnel excavation on rock deformation and pore pressure,as well as the modes of lining response.In addition,this study also systematically investigates the effects of water level fluctuation and burial depth on twin-tunnel excavation.The results indicate that the increase of water level or burial depth will enhance the excavation effects and strengthen the twin-tunnel interactions.These results provide useful insights for estimating the construction impact range and degree of twin tunnels,and serve as basic references for the design of cross-river twin tunnels.

关 键 词：Numerical modeling Twin tunnels Crossing river Hydro-mechanical coupling Lining response 

分 类 号：U45[建筑科学—桥梁与隧道工程]