仰拱在隧道塌方险情处置中的作用效果分析

针对仰拱支护在隧道塌方险情处置中的应用问题,结合松建高速公路杜布隧道工程实际,首先详细分析了杜布隧道洞口浅埋段施工期间塌方险情的形成机理,通过对施工监控量测结果的分析,阐明了抢险期间仰拱快速施做起到的有效作用;基于有限差分理论,从隧道实际地质模型入手,通过对有、无仰拱支护情况下,隧道周边围岩的位移场及初期支护结构的受力状况进行对比分析,进一步阐明了仰拱支护在预防塌方发生中的有效作用,为今后指导类似工程的设计与施工提供了借鉴与参考.

A Study on the Effect of an Inverted Arch in the Disposal of Tunnel Landslide Dangers

For the application of the inverted arch support in the disposal of tunnel landslide dangers,this paper analyses in detail the formation mechanism of landslide dangers during the construction of the Dubu Tunnel portal combined with the Dubu Tunnel engineering practice of the Songjian Highway.Through analyzing the construction monitoring results,it expounds the effect of the rapid construction of the inverted arch during the rescue.Based on the finite difference theory and the geology model of the Dubu Tunnel,through the compara-tive analysis of the displacement of surrounding rocks and the stress of the initial support in the situation with or without the inverted arch,it further explains the effect of the inverted arch in preventing the landslides,which provides guidance to and reference for the future de-sign and construction of similar projects.