仰拱步距和台阶长度对软岩大断面隧道稳定性影响分析  

Analysis of Influence of Invert Arch Step Distance and Bench Length on Stability of Large Cross-section Soft Rock Tunnels

作　　者：史继尧[1] 王玥[1] SHI Jiyao WANG Yue(Survey, Design and Research Institute of China Railway Tunnel Group Co., Ltd., Guangzhou 511455, Guangdong, China)

机构地区：[1]中铁隧道集团有限公司勘测设计研究院,广东广州511455

出　　处：《隧道建设》2017年第4期428-434,共7页Tunnel Construction

摘　　要：在软岩大断面隧道施工过程中,围岩稳定性控制难度很大。依托宝兰客专古城岭隧道的勘察设计资料、施工工艺和监测数据,建立符合工程实际的基本数值模型,分析软岩大断面隧道的变形特点,揭示仰拱步距和台阶长度对初期支护变形的影响规律。根据模拟试验结果指导古城岭隧道大变形区段施工,将初期支护累计变形减小了70%。The control of stability of surrounding rocks is difficult during construction of large cross-section soft rocktunnel. A numerical model of Guchengling Tunnel on Baoji-Lanzhou Passenger-dedicated Railway is established basedon surveying and design data, construction technology and monitoring data. The deformation characteristics of largecross-section soft rock tunnels are analyzed and the influence of invert arch step distance and bench length on stability oflarge cross-section soft rock tunnels is revealed. The numerical test results are regarded as guidance for construction oflarge deformation section of Guchengling Tunnel, the accumulated deformation of primary support has been reducedby 70%.

关 键 词：软岩大断面隧道 仰拱步距 台阶长度 数值模拟 初期支护变形 结构内力 围岩稳定性 

分 类 号：U45[建筑科学—桥梁与隧道工程]