Numerical analysis of the influence of a river on tunnelling-induced ground deformation in soft soil

作     者：Jia-xin LIANG Xiao-wu TANG Tian-qi WANG Yu-hang YE Ying-jing LIU Jia-xin LIANG;Xiao-wu TANG;Tian-qi WANG;Yu-hang YE;Ying-jing LIU

作者机构：Research Center of Coastal and Urban Geotechnical EngineeringDepartment of Civil EngineeringZhejiang UniversityHangzhou310058China Engineering Research Center of Urban Underground Space Development of Zhejiang ProvinceHangzhou310058China Zhongtian Construction Group Co.Ltd.Hangzhou310020China 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2022年第23卷第7期

页      面：564-578页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：This work is supported by the Key Water Science and Technology Project of Zhejiang Province(No.RB2027) the Zhejiang Province Public Welfare Technology Application Research Project(No.LGG22E080002),China 

主　　题：Tunnelling Ground deformation Numerical analysis Reinforcement 

摘      要：When tunnels are constructed in coastal cities,they will inevitably undercross a *** the influence of rivers on tunnelling-induced deformation in costal soft soil is of great significance for controlling excessive settlement and protecting surrounding *** paper presents a case study of twin tunnels undercrossing a river in soft soil in Hangzhou,*** soft soil of Hangzhou refers to cohesive soil in a soft plastic or fluid plastic state with high natural water content,high compressibility,low bearing capacity,and low shear *** the influence of the river,the research region was divided into two parts,inside and outside the river-affected area,based on monitoring data of the Zizhi *** development law of surface settlement is divided into three *** the first and second stages,the surface settlement within and outside the river-affected area showed a similar trend:the settlement increased and the growth rate of settlement in the second stage was smaller within the river-affected *** the third stage,the surface settlement continued to increase within the river-affected area,while it converged outside the river-affected *** the river-affected area,there was an asynchronization of the sinking rate and stability of vault settlements and surface settlements.A numerical model was established by simulating different reinforcements of the *** numerical model revealed that the ground movement is influenced by the distribution and amount of the excess pore water *** excess pore pressure was concentrated mostly in the range of 1.0H_(t)-3.0H_(t)(H_(t) is the tunnel height)before the tunnel face,especially within the river-affected *** the river-affected area,the dissipation of excess pore water pressure needs more time,leading to slow stabilization of surface *** undercrossing a river,a cofferdam is necessary to reduce excessive ground deformation by dispersing the distribution o