摘要
山岭铁路受地形影响及车站设置需要,车站延伸到隧道的实例越来越多,燕尾式的隧道平面布置形式是其中最常见的一种,在小净距隧道施工时由于后行隧道对先行隧道的影响,造成初期支护、二次衬砌开裂及仰拱隆起等问题。文章以兰渝铁路新城子隧道两单线小净距段施工为例,分析探讨了高地应力、软岩大变形、小净距隧道支护形式及左右洞仰拱与二次衬砌的施工顺序,可为类似隧道施工与管理提供借鉴。
Increasingly, stations are being extended to tunnels due to the effects of topography on mountain rail-ways and the requirements of the stations. A forked tail tunnel arrangement is the most popular one, but the concomi-tant effect of the following tunnel on the antecedent tunnel during construction of a tunnel with small spacing causescracking of the primary support and secondary lining as well as heaving of the invert, which continues to trouble en-gineers. Different problems are encountered by different tunnels because of the complexities and variations of geo-logical environments. Using the construction of two single-line sections with small spacing for the Xinchengzi tunnelon the Lanzhou-Chongqing railway as an example, the support form for a soft rock tunnel with small spacing andhigh geostress and deformation, as well as the invert construction sequence of the left and right lines and secondarylining, are analyzed and discussed.
作者
卫鹏华
WEI Penghua(Lanzhou-Chongqing Railway Limited Liability Co., Lanzhou 73000)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第3期167-175,共9页
Modern Tunnelling Technology
关键词
高地应力
软岩
大变形
小净距隧道
支护形式
施工顺序
High geostress
Soft rock
Large deformation
Tunnel with Small spacing
Support form
Constructionsequence