软弱围岩公路隧道初支大变形换拱处理措施分析
Analysis on Arch Replacement Treatment Measures for Large Deformation of Initial Support of Highway Tunnel in Weak Surrounding Rock
摘要
在软弱围岩中由于围岩压力大，挤压效应明显，变形收敛时间长以及支护参数强度不足等原因，隧道施工过程中经常出现初支大变形甚至侵限的情况，尤以在隧道洞口浅埋段更甚。针对贵州盘兴高速公路城关隧道洞口段施工中出现初支侵限的实际工况，通过换拱措施对其进行治理，并取得了良好的效果，认为处理措施得当，可为类似问题提供借鉴经验。
Abstract
In soft surrounding rock，large initial deformation or even invading limit often occurs during tunnel construction due to the highpressure of surrounding rock，obvious extrusion effect，long deformation convergence time and insufficient strength of support parameters.Inview of the actual working conditions of the Chengguan Tunnel of Panxing Expressway in Guizhou Province where the initial branch intrusion limitoccurs，the measures of arch replacement are adopted to control the tunnel，and good results have been achieved.It is considered that the appropriatemeasures can provide experience for similar problems.
关键词
软弱围岩/初支大变形/换拱/公路隧道Key words
weak surrounding rock；large deformation of initial support；arch replacement；highway tunnel引用本文复制引用
出版年
2018
NETL
NSTL
万方数据