摘要
针对隧道过风化槽地段施工过程中遇到的问题,分析其主要原因,并结合专家建议和现场情况,修正了原方案,提出了施工应对措施,如加强超前地质预报和初期支护,采用"台阶法+竖向钢支撑"的开挖方法,进而应用数值模拟和现场监测分析其安全性,并基于强度折减法研究隧道整体稳定性。数值方案和监测结果表明,竖向支撑可以很好地减少拱顶沉降;强度折减法表面隧道安全系数为1.8,且应以拱顶沉降作为围岩失稳的主要指标,研究成果可为同类隧道工程过风化槽等地段施工提供参考。
The causes of the problem encountered during tunnel construction in the weathered lyzed. Based on expert advice and geology condition, the original design was modified and some c slot were anawere put forward, such as to intensify the geology forecast and preliminary support, excavation by bench method with vertical temporary steel support. Construction safety was justified using simulation software and in - site monitoring. The tunnel stability was analyzed by strength reduction method. In - site monitoring and numerical simulation results show that the vertical steel support can effectively reduce crown displacement. The tunnel safety factor is 1.8 based on strength reduction method, and the main indicator of rock failure is crown displacement. The research can give a reference for similar tunnel projects.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第A01期1503-1507,1512,共6页
Chinese Journal of Underground Space and Engineering
基金
浙江省交通投资集团有限公司科技项目
湖南省研究生创新基金项目
关键词
隧道工程
风化槽地段
施工安全
强度折减法
安全系数
tunnel engineering
weathered trough slot
construction safety
strength reduction method
safety factor
