摘要
隧道施工过程中存在多场耦合效应问题,需研究耦合效应的影响。以蓝家岩隧道为工程背景,建立三维数值模型,基于流固耦合和不耦合工况,对比分析隧道施工过程中变形特征、初期支护受力特性及地层孔隙水压力变化规律。研究结果表明,考虑耦合效应下,隧道拱部沉降、洞周水平位移、底部隆起均较大;不考虑和考虑流固耦合效应下围岩与初期支护接触应力均为压应力,且分布特征相似,考虑流固耦合效应下围岩压力大于不考虑流固耦合效应下的围岩压力,高地应力软岩隧道施工时考虑流固耦合效应可更真实地反映支护结构受力状态;隧道开挖过程中围岩孔隙水压力增大,地下水易在隧道拱腰至拱脚位置涌出,需合理设计排水措施,并在拱底处进行降水。
The problem of multi-field coupling effect exists in the tunnel construction process and it should be studied.Using the Lanjiayan Tunnel as the engineering background,a 3D numerical model is established to compare and analyze the deformation characteristics,initial support force characteristics and pore water pressure changes during the tunnel construction process based on fluid-solid coupled and uncoupled conditions.The research results show that the settlement of the tunnel arch,horizontal displacement around the cavern and bottom uplift are larger when the fluid-solid coupling effect is considered.The contact stress between the surrounding rock and the initial support is compressive stress with or without considering the fluid-solid coupling effect,and the distribution characteristics are similar.The surrounding rock pressure with the fluid-solid coupling effect is greater than that without considering the fluid-solid coupling effect.Considering the fluid-solid coupling effect during the construction of high ground stress soft rock tunnel can reflect the force state of the support structure more realistically.During the tunnel excavation process,the pore water pressure in the surrounding rock will increase,and groundwater will easily gush out from the arch waist and the arch foot,which requires reasonable design of drainage measures at the inverted arch.
作者
罗春雨
钱志豪
刘富华
康海波
杜明
谭小军
杨文波
LUO Chunyu;QIAN Zhihao;LIU Fuhua;KANG Haibo;DU Ming;TAN Xiaojun;YANG Wenbo(Branch of Road Tunnel,Sichuan Road and Bridge Construction Co.,Ltd.,Chengdu,Sichuan 610200,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《施工技术（中英文）》
CAS
2023年第9期88-94,共7页
Construction Technology
基金
国家自然科学基金(51678499)。
关键词
隧道
围岩
地应力
流固耦合
监测
数值模拟
tunnel
surrounding rock
ground stress
fluid-solid coupling
monitoring
numerical simulation
