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隧道属于地下工程,在施工过程中围岩既是开挖对象,又是支护对象,隧道开挖后,原有的受力平衡被破坏,围岩在自重作用下,应力重新分布,构成新的受力平衡体系。因此准确掌握地质情况,充分了解围岩的性质,紧密结合隧道跨度及埋深等情况,以采取合理有效的开挖方式和支护措施,不仅能有效预防隧道坍方的发生,还能保障工程施工安全、工期和节省工程投入。结合广州东二环高速公路龙头山隧道右线进口段坍方冒顶事故,剖析浅埋大跨隧道坍方冒顶事故原因,为同类工程设计、施工提供借鉴与参考。
The tunnel belongs to the underground project. During the construction process, the surrounding rock is not only the object of excavation but also the supporting object. After the tunnel excavation, the original stress balance is destroyed and the surrounding rock is redistributed under its own weight to form a new Force balance system. Therefore, it is of great importance to understand the geological conditions, fully understand the nature of the surrounding rock, and closely integrate with the span and depth of the tunnel so as to adopt reasonable and effective excavation methods and support measures, which can not only effectively prevent the occurrence of tunnel collapse, but also ensure the construction Safety, schedule and save engineering investment. Combining with the roof collapse accident at the right entrance of Longtoushan Tunnel in Guangzhou East Second Ring Expressway, the paper analyzes the causes of roof collapse accident of shallow buried long span tunnel and provides reference and reference for the similar project design and construction.