泥岩隧洞围岩渐进性变形与破坏机制探索

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摘要为解决泥岩隧洞某洞段在施工完成后围岩突然发生持续大变形的问题，综合隧洞开挖揭露的地质条件和实测变形规律，并进行相应数值分析试验，研究发现原因是隧洞围岩中存在隔水层，后续的开挖导致围岩隔水层破坏，使原先处于干燥状态的围岩遭受地下水浸泡而软化，导致本已趋于稳定的隧洞重新发生收敛变形和支护结构破坏。经过对处理措施的数值试验研究和现场实际效果综合对比分析，发现采取以排导为主的方案是较为合理、经济、有效的处理措施。

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关键词 ：隧道工程, 泥岩隧洞, 围岩变形机制, 处理措施, 监测, 数值试验

Abstract：In order to solve the problem of sustained large deformation of mudstone tunnel surrounding rock after construction，the geological conditions revealed by tunnel excavation and measured deformation law are combined，as well as the corresponding numerical experiments. Result shows that some impermeable layers exist in the tunnel surrounding rocks and subsequent excavation led to destruction of surrounding rock impermeable layer. Then the groundwater flows to dry zone and softens the surrounding rocks of original dry zone gradually，which result in re-deformation of stabilized surrounding rock and damage of supporting structures. Through the comprehensively comparative analysis of treatment measures in numerical experiments and field tests，the measure of platoon and guide is more reasonable，economical and effective.

Key words： tunnelling engineering mudstone tunnel deformation mechanism of surrounding rocks treatment measure monitoring numerical experiments

收稿日期: 2013-09-18

引用本文:

李宁，刘波，吕高. 泥岩隧洞围岩渐进性变形与破坏机制探索[J]. 岩石力学与工程学报, 2014, 33(sl): 3087-3092.
LI Ning，LIU Bo，LU Gao. RESEARCH ON ASYMPTOTIC DEFORMATION AND DESTRUCTION MECHANISM OF MUDSTONE TUNNEL SURROUNDING ROCKS. , 2014, 33(sl): 3087-3092.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3087

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