摘要
文章以深圳大跨扁平马峦山隧道为工程背景,采用模型试验法研究了Ⅳ级、Ⅴ级围岩条件下隧道结构在附加荷载作用下的破坏过程,分析了围岩压力、衬砌变形和结构内力的变化规律。研究结果表明:(1)拱顶围岩压力先增大后减小,当附加荷载达到至某一值时,拱顶围岩压力最大,且衬砌变形较小;(2)随着附加荷载的增加,衬砌变形均经历弹性阶段、塑性阶段、破坏阶段三个阶段,且Ⅴ级围岩衬砌变形较大;(3)随着附加荷载的增加,衬砌结构内力增大,衬砌弯矩分布形状近似呈"蝴蝶型",轴力分布形状近似呈"菱形",且分布不均匀性增大。
Based on the large-span flat Maluanshan tunnel in Shenzhen,the failure process of tunnel structure un⁃der the action of additional load in the surrounding rocks of gradeⅣandⅤis studied by model test and the change rules of surrounding rock pressure,lining deformation and internal force of tunnel lining are analysed.The research results show that:(1)the surrounding rock pressure at crown increases at first and decreases later,and reaches the maximum with small lining deformation when additional load reaches certain critical value;(2)with an increase of additional load,deformation of lining experiences elastic stage,plastic stage and failure stage,and the lining defor⁃mation is large in the surrounding rock of gradeV;(3)with an increase of additional load,internal force of tunnel lining increases and the distributions of bending moment and axial force present the forms of"butterfly"and"rhombus",with more nonuniformity of distribution.
作者
蔡鑫
刘辉喜
陈福斌
吴连波
牛冰艳
刘学增
桑运龙
CAI Xin;LIU Huixi;CHEN Fubin;WU Lianbo;NIU Bingyan;LIU Xuezeng;SANG Yunlong(Shenzhen Transportation Public Facilities Construction Center,Shenzhen 518000;Civil Engineering Center of Ministry of Education Information Technology,Tongji University,Shanghai 200092;Shanghai Engineering Research Center of Underground Infrastructure Detection and Maintenance Equipment,Shanghai 200092)
出处
《现代隧道技术》
EI
CSCD
北大核心
2020年第4期150-157,170,共9页
Modern Tunnelling Technology
基金
深圳市交通公用设施建设中心交通建设工程课题“坪盐通道工程(城市道路特长大断面隧道数字化建管养关键技术研究)”(20160318002B)。
关键词
大跨扁平隧道
模型试验
附加荷载
围岩压力
衬砌变形
结构内力
Large-span flat tunnel
Model test
Additional load
Surrounding rock pressure
Lining deformation
In⁃ternal force of lining structure
