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Research on collapse mechanism of Mayakou tunnel under flow-stress coupling and its treatment
Author(s): 
Pages: 18-22
Year: Issue:  7
Journal: Geotechnical Investigation & Surveying

Keyword:  软岩 塌方治理 渗流场与应力场耦合 隧道;
Abstract: 马垭口隧道围岩以泥岩为主,裂隙发育,地下水丰富,主要为Ⅴ和Ⅵ级。在建设过程中,隧道内产生大面积坍塌。本文从岩性条件、地下水情况以及隧道设计参数等方面,探讨了该隧道塌方的机理,并采用FLAC2D软件对渗流场和应力场耦合作用下的围岩变形和支护结构受力进行分析。基于对隧道塌方原因的正确认识,制定了未塌方段的加固方案和塌方段的加固与开挖方案。通过监测隧道变形、围岩与支护间接触压力等方面对隧道塌方治理方案进行综合评价。从实施情况可以看出,处理方案取得了较好的效果,确保了隧道施工安全稳定。
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