达陕高速某隧道塌方机制与数值模拟

摘要

Though the collapse occurred in the tunnel LK42 +384 ～388 is small scale, its produce mechanism is typical. According to the geological analysis and numerical simulation method, this paper makes a detailed analysis of the produce mechanism. It gets the conclusion that the cause of the collapse is the relationship between the attitude of stratum and the tunnel axis, the alternating beds of soft rocks and hard rocks, and so on. The paper also sums up a geological model of the tunnel collapse. It expounds the mechanism,characteristics, omen etc. of “Collapse by the gradual failure of a natural arch”.%通过地质分析、数值模拟计算的方法,对某隧道LK42+384～388处塌方的产生机制进行了详细的分析,认为是由于地层产状与隧道轴线的关系,以及软硬岩互层等原因造成了此次塌方,并总结出一种隧道塌方的地质模型,详细阐述了"天然拱渐进失效型塌方"的机制、特征、预兆等.