煤系地层大跨度隧道围岩结构稳定性研究

›› 2010, Vol. 31 ›› Issue (S1): 266-270.

煤系地层大跨度隧道围岩结构稳定性研究

康勇^{1, 2}，杨春和¹，何正³，姜永东²

1.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071； 2.重庆大学西南资源开发及环境灾害控制工程教育部重点实验室，重庆 400044；3.重庆市安全生产监督管理局执法大队，重庆 400020

收稿日期:2010-04-23 出版日期:2010-08-10 发布日期:2010-09-09
作者简介:康勇，男，1978年生，博士，副教授，主要从事隧道及地下工程方面的研究。
基金资助:
国家自然科学基金（No. 50704039，50921063）。

Stability analysis of surrounding rock structure of large-span tunnel passing through coal seams

KANG Yong ^{1, 2}, YANG Chun-he¹, HE Zheng³, JINAG Yong-dong²

1. State Key Laboratory of Geomechanics and Geotechnical Engineering ,Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Key Laboratory of Ministry of Education for Exploitation of Southwest Resources and Environment Disaster Control Project, Chongqing University, Chongqing 400044, China; 3.Chongqing Administration of Work Safety, Chongqing 400020, China

Received:2010-04-23 Online:2010-08-10 Published:2010-09-09

摘要/Abstract

摘要：

针对目前大跨穿煤隧道的研究热点，以重庆市绕城高速公路环山坪隧道为研究对象，在界定大跨度隧道及分析其围岩稳定性关键影响因素的基础上，结合现场监测和数值模拟对大跨度穿煤隧道围岩结构稳定性进行了分析。结果表明，大跨度隧道各处等效应力集中对扁平率变化敏感程度不同，拱脚最为敏感，拱顶基本不随扁平率的改变而变化。隧道穿越软弱煤层段时，围岩应力重分布受影响明显，拱顶位移随开挖面不断推进急剧增加，且隧道围岩塑形圈不断向拱顶围岩内部发展。尤其当煤层软弱带与隧道顺层相交时，隧道荷载结构偏压效应凸显，偏压荷载随煤层倾角变陡而增大，易造成支护结构失稳破坏，在设计及施工中应特别加以重视。

关键词: 煤系地层, 大跨度隧道, 偏压, 围岩稳定性

Abstract:

Focusing on the research hotspot of large-span tunnel passing through coal seams, and taking Chongqing Huanshanping tunnel for example, some works on defining the large-span tunnel and the mechanism of interaction between surrounding rock and support structure was primary conducted, and then on-site monitoring and numerical simulation of the stability of large-span tunnel passing through coal seams were carried out. The results show that the effect of equivalent stress concentration in different part of the tunnel structure has different sensitivities to the change of flat rate, the most sensitive is arch spring, and the crown is the least. Due to sharp stress redistribution when the tunnel is excavated through coal soft rock mass, tunnel crown settlement increases greatly; and the plastic zone can also quickly expand along the coal seam. Specially when the weak coal layer is intersected by the tunnel, the effect of bias pressure becomes much larger and the bias pressure increases with the coal seam steepens, so as to easily lead to the failure of surrounding rock and support structure. Therefore, it should be dealt with carefully during the design and construction.

Key words: coal seams, large-span tunnel, bias pressure, stability of surrounding rock

中图分类号:

U 459.4

康勇，杨春和，何正，姜永东. 煤系地层大跨度隧道围岩结构稳定性研究[J]. , 2010, 31(S1): 266-270.

KANG Yong, YANG Chun-he, HE Zheng, JINAG Yong-dong. Stability analysis of surrounding rock structure of large-span tunnel passing through coal seams[J]. , 2010, 31(S1): 266-270.

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