富水软弱破碎带大断面隧道施工渗流影响及控制效果分析  

Analysis on Seepage Influence and Control Effect of Large Section Tunnel Construction in Water Rich Weak Fracture Zone

作　　者：罗燕平[1] 刘得第 王生 曾斌 邱军领 冯志华 王强 LUO Yan-ping;LIU De-di;WANG Sheng;ZENG Bin;QIU Jun-ling;FENG Zhi-hua;WANG Qiang(Chuanjiao Cross Road&Bridge Co.,Ltd.,Guanghan 618300,China;School of Highway,Chang'an University,Xi'an 710064,China;Hebei Provincial Communications Planning and Design Institute,Shijiazhuang 050011,China)

机构地区：[1]四川川交路桥有限责任公司,广汉618300 [2]长安大学公路学院,西安710064 [3]河北省交通规划设计研究院,石家庄050011

出　　处：《科学技术与工程》2023年第13期5756-5763,共8页Science Technology and Engineering

基　　金：四川公路桥梁建设集团有限公司技术开发(委托)项目(220221210155);陕西省重点研发计划(2020SF-428)。

摘　　要：依托大断面铁路隧道工程为背景,通过数值模拟并结合现场实测方法研究了隧道不同埋深条件下拱顶沉降、水平收敛、整体围岩应力和塑性区分布规律,并在此基础上,对隧道在富水条件下的孔隙水压力进行了探讨。结果表明:拱顶沉降、水平收敛位移与水位高度呈正相关,埋深对水平位移影响较小,但影响范围增大;且随着隧道埋深的增加,拱顶沉降和水平收敛位移将在与破碎带间隔10 m左右开始呈“瀑布式”增长;围岩应力随埋深和水位高度呈线性增长,其最大值集中在拱腰处,最大达到1.34 MPa,增长速率受水位高度影响更大;塑性区主要分布在隧道两侧,但随着埋深增加,拱顶也出现少量塑性区,这对拱顶的稳定是十分有利的;隧道周围孔隙水压力与埋深和地下水位高度呈正相关。该项研究可为提升大断面隧道穿越断层破碎带施工提供有益的借鉴和参考。Based on the background of a large section railway tunnel project,through numerical simulation and field measurement,the settlement of vault,horizontal convergence,overall surrounding rock stress and plastic zone distribution of tunnel under different buried depths were studied.On this basis,the pore water pressure of tunnel under water rich conditions was discussed.The results show that the vault settlement and horizontal convergence displacement are positively correlated with the height of water level,and the buried depth has little effect on the horizontal displacement,but the influence range increases.With the increase of the buried depth of the tunnel,the vault settlement and horizontal convergence displacement will begin to increase in a“waterfall”at an interval of about 10 m from the fracture zone.The stress increases linearly with the height of the arch,and the maximum stress increases at the waist height of the arch and reaches 1.34 MPa.The plastic zone is mainly distributed on both sides of the tunnel,but with the increase of buried depth,a small amount of plastic zone also appears on the vault,which is very beneficial to the stability of the vault.The pore water pressure around the tunnel is positively correlated with the buried depth and the height of groundwater level.This study can provide useful reference and reference for the construction of large section tunnel crossing fault fracture zone.

关 键 词：大断面铁路隧道 富水断层破碎带 数值模拟 现场实测 围岩变形 塑性区 渗流场 

分 类 号：U451[建筑科学—桥梁与隧道工程]