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地形偏压隧道开挖变形特征及预加固措施

, PP. 97-103

Keywords: 隧道工程,地形偏压隧道,FLAC,变形特征,预加固

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Abstract:

在全面考虑了偏压隧道影响因素的基础上,采用FLAC对不同横坡坡度、围岩级别和侧覆土厚下的偏压隧道进行了开挖模拟,通过对隧道开挖变形特征及各关键点位移的分析,指出隧道在侧覆土厚大于20m后基本不受偏压的影响,在侧覆土厚小于15m时则需要在开挖前进行预加固措施。基于此,对不同工况下隧道进行的预加固措施的模拟分析,结果表明V级围岩条件下,侧覆土小于7m时主要需要解决的是浅埋侧反压能力不够的问题,而大于7m后需要解决的则是深埋侧压力过大的问题,并在实际工程中得到验证。研究结论可为类似工程的设计和施工提供参考。

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