Fluid-solid coupling numerical simulation of micro-disturbance grouting treatment for excessive deformation of shield tunnel  

作　　者：Yanjie Zhang Zheng Cao Chun Liu Hongwei Huang 

机构地区：[1]College of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou 450001,China [2]School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China [3]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China [4]Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China

出　　处：《Underground Space》2024年第6期87-100,共14页地下空间（英文）

基　　金：supported by the Natural Science Foundation of Henan,China(Grant No.242300421646);the Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,China(Grant No.KLE-TJGE-B2205).

摘　　要：Micro-disturbance grouting is a recovery technique to reduce the excessive deformation of operational shield tunnels in urban areas.The grout mass behaves as a fluid in the ground before hardening to form a grout–soil mixture,which highlights the necessity of using fluid–solid coupling method in the simulation of grouting process.Within a discrete element modeling environment,this paper proposes a novel fluid-solid coupling method based on the pore density flow calculation.To demonstrate the effectiveness of this method,it is applied to numerical simulation of micro-disturbance grouting process for treatment of large transverse deformation of a shield tunnel in Shanghai Metro,China.The simulation results reveal the mechanism of recovering tunnel convergence by micro-disturbance grouting in terms of compaction and fracture of soil,energy analysis during grouting,and mechanical response of soil-tunnel interaction system.Furthermore,the influence of the three main grouting parameters(i.e.,grouting pressure,grouting distance,and grouting height)on tunnel deformation recovery efficiency is evaluated through parametric analysis.In order to efficiently recover large transverse deformation of shield tunnel in Shanghai Metro,it is suggested that the grouting pressure should be about 0.55 MPa,the grouting height should be in the range of 6.2–7.0 m,and the grouting distance should be in the range of 3.0–3.6 m.The results provide a valuable reference for grouting treatment projects of over-deformed shield tunnel in soft soil areas.

关 键 词：Fluid-solid coupling Discrete element method Pore density flow Micro-disturbance grouting Soil-tunnel interaction 

分 类 号：O35[理学—流体力学]