横通道开挖对高地应力软岩隧道结构受力与变形的影响  

Influence of Transverse Passage Construction on Stress and Deformation Condition of Main Tunnel Structures in Soft Rock with High Ground Stress

作　　者：师亚龙[1] 刘志强[1] 吴剑[1] 郑波[1] 曹海静[1] SHI Yalong LIU Zhiqiang Wu Jian Zheng Bo Cao Haijing(China Railway Southwest Research Institute Co., Ltd., Chengdu Sichuan 611731, China)

机构地区：[1]中铁西南科学研究院有限公司,四川成都611731

出　　处：《铁道建筑》2017年第3期45-49,共5页Railway Engineering

基　　金：铁道部科技研究开发计划(2009G009-B-01)

摘　　要：在开挖横通道过程中横通道附近正洞往往发生初支结构严重变形及二衬结构开裂。本文通过现场实测和数值模拟的方法分析了横通道施工时隧道正洞支护结构的变形规律和受力特性。结果表明:衬砌结构发生变形和开裂的主要原因是横通道开挖时造成衬砌附近产生较大应力,应力最大位置集中在横通道同侧的墙脚与拱脚附近。因此开挖横通道的时机应选择在正洞开挖达到横通道设计里程时,并对其附近支护进行加强。According to the phenomena of serious deformation of primary support structure and cracking of secondary lining structure of the main tunnel during transverse passage construction, the deformation regularity and stress characteristics of the main tunnel support were studied by using on-site investigation method and numerical simulation method. The results show that the main reasons of deformation and cracking of lining structure are that transverse passage construction leads to a large stress near the lining structure. And the maximum stress appears around the skewback and arch foot on the same side of transverse passage. Therefore, the transverse passage should be excavated when the excavation of the main tunnel reaches the design mileage of transverse passage and the support near the tunnel should be reinforced.

关 键 词：铁路隧道 受力变形 现场调研 数值模拟 软岩隧道 横通道施工 正洞支护 

分 类 号：U452.27[建筑科学—桥梁与隧道工程]