河北地质大学学报2023，Vol.46Issue(6)：59-67,9.DOI:10.13937/j.cnki.hbdzdxxb.2023.06.008
断层破碎带区域贯通施工的富水隧道力学特性分析
Analysis of Mechanical Characteristics of Through Construction Water-rich Tunnel in Fault Fracture Zone
摘要
Abstract
Based on the basic theory of seepage field-stress field coupling,a three-dimensional finite element numerical model was established by numerical simulation method to study mechanical characteristics of through construction water-rich tunnel in fault fracture zone,with the background of Wenbishan 1#tunnel project on Puyan Expressway in Fujian Province.Through parameter analysis,the influence of key factors such as stress,plastic zone penetration range,vault settlement,pore pressure and extrusion deformation of palm surface under water-rich environment conditions with different water head heights is quantified.The results show that the stress of surrounding rock is concentrated at the arch waist during tunnel excavation.The maximum principal stress at the surrounding rock of the arch,arch roof settlement and arch bottom uplift decrease and increase respectively with the increase of water head height.With the increase of water head height in the plastic zone,the penetration distance increases,the extrusion deformation of the palm surface increases,and the excavation footage decreases,the stability of the palm surface is higher.During the excavation of the tunnel,the pore pressure concentrates around the tunnel,and the pore water pressure tends to be stable after the tunnel excavation surface is closed in time with the initial support;groundwater will not only increase the sudden water inflow in the penetration area,but also significantly increase the extrusion deformation in the tunnel penetration area and increase the risk of instability.The tunnel should try to avoid penetration in the water-rich area.关键词
隧道/围岩稳定性/数值模拟/断层破碎带/掌子面/塑性区Key words
tunnel/surrounding rock stability/numerical simulation/fault fracture zone/palm surface/plastic zone分类
交通工程引用本文复制引用
吴波,刘兆春,刘聪..断层破碎带区域贯通施工的富水隧道力学特性分析[J].河北地质大学学报,2023,46(6):59-67,9.基金项目
国家自然科学基金项目(52168055) （52168055）
江西省自然科学基金项目(20212ACB204001). （20212ACB204001）
