高速公路隧道洞口浅埋段塌方冒顶分析与治理

Analysis and Treatment of Collapse and Roof Fall in Shallow Buried Highway Tunnel Entrance

某高速公路隧道左线洞口位于隧道浅埋段,由于受地质状况和施工不当的影响,在施工过程中发生隧道塌方冒顶事故。针对隧道浅埋地段如何有效预防和处理塌方冒顶的问题,本文以该高速公路隧道塌方冒顶段为依托工点,采用大型有限元数值模拟软件建立塌方区实际地质模型,对隧道塌方冒顶发生过程进行数值模拟;并结合数值计算结果对本次隧道塌方冒顶过程进行机理分析与整治方案设计,为依托工点合理整治提供依据。后期监测结果表明整治方案合理有效,研究结果可为公路隧道浅埋段塌方冒顶的预防与处理提供有益参考。

A synergistic effect of geological condition and improper construction method gave rise to an accident of collapse and roof fall that occurred in the left entrance of a shallow buried highway tun- nel. To effectively prevent and handle the accidents of collapse and roof fall, this paper takes the acci- dent inthis expressway tunnel for example and establishes the geological model of landslide area based on finite element numerical simulation software. The process of collapse and roof fall is simulatedand the mechanism is analyzed based on the numerical results, and an overall treatment scheme is therefore pro- posed. The remediation measures are proved reasonable and effective by later monitoring results and the findings can provide useful references for the prevention and treatment of collapse and roof fall in shallow buried highway tunnel.