Analysis of stress and deformation site-monitoring in fault zone of Wushaoling tunnel under complex geological conditions

LEI Jun; ZHANG Jin-zhu; LIN Chuan-nian

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Analysis of stress and deformation site-monitoring in fault zone of Wushaoling tunnel under complex geological conditions

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- Analysis of stress and deformation site-monitoring in fault zone of Wushaoling tunnel under complex geological conditions
- Vol. 29, Issue 5, (2008)
- 作者机构：
  
  1. 北京交通大学土木建筑工程学院,北京,100044
  2. 铁道部工程管理中心乌鞘岭隧道建设指挥部,兰州,730000
  3. 兰州大学土木工程与力学学院,兰州,730000
- 作者简介：
- 基金信息：
- DOI：
  CLC： U459
- Online First：24 July 2013，
  
  Published：2008
- 稿件说明：
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LEI Jun, ZHANG Jin-zhu, LIN Chuan-nian. Analysis of stress and deformation site-monitoring in fault zone of Wushaoling tunnel under complex geological conditions[J]. 2008, 29(5).
DOI：

LEI Jun, ZHANG Jin-zhu, LIN Chuan-nian. Analysis of stress and deformation site-monitoring in fault zone of Wushaoling tunnel under complex geological conditions[J]. 2008, 29(5). DOI：

摘要

乌鞘岭隧道是我国迄今为止已建成最长的单线铁路隧道，隧道总长约为20.05 km，而F7断层是乌鞘岭隧道中最长、地质条件最为复杂的活动断层，对隧道施工十分不利。根据F7断层特点及施工中遇到的问题，在乌鞘岭隧道岭脊地段F7断层区段，对洞室开挖后的围岩及支护衬砌结构进行各项应力监测和收敛变形监测，分析了围岩、衬砌系统受力及变形变化趋势，从而探究围岩挤压大变形的机制，掌握围岩应力释放与围岩压力的作用规律；并根据现场监测结果，提出对隧道穿越F7断层区段的断面采用动态优化设计方案及改进的施工措施，避免隧道出现大变形，从而保证隧道穿越F7断层区段安全、快速的进行。

Abstract

Wushaoling tunnel is the longest single line railway tunnel in China up to now with the length of 20.50 km

and the F7 fault is the largest active fault

in which the geological conditions is highly complicated; it effects the tunnel construction badly. According to the characteristics of F7 fault and the problems met in tunnel construction

the stress and displacement of rock wall and lining structures were long term monitored after excavating in F7 fault section of Wushaoling tunnel. The trend of stress and displacement changing are analyzed based on the site monitoring results; and the mechanism of the extrusion large-deformation are explored so as to understand the regulation of stress releasing of rock wall and rock pressure. Furthermore

based on the site monitoring results

the optimized dynamic design and improved construction measure are proposed and adopted for the section at which the tunnel crosses the F7 fault. It not only avoided the large deformation occurrence

but also guaranteed tunnel drilling through the F7 fault section safely and quickly.

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