山体滑坡对公路山岭隧道影响的数值分析

Numerical Analysis of the Influence of Landslide on Highway Mountain Tunnel

依托川藏公路102隧道工程,在收集整理102隧道勘察设计资料、总结国内外已有隧道—滑坡体系相互作用机理的基础上,根据2#滑坡与隧道的相对位置关系,采用了FLAC3D三维数值模拟分析方法,对于运营期间滑坡体发生滑动对隧道结构的影响进行了模拟分析。通过对比分析在隧道拱顶距滑动面不同最小距离(1D-4D)条件下,由于降雨导致滑坡发生滑动时,隧道的二次衬砌受力特征及其安全性,为今后类似条件下隧道工程建设提供借鉴经验和工程依据。

Relying on the 102 tunnel project of Sichuan Tibet highway,on the basis of collecting and arranging the data of the survey and design of the 102 tunnel and summarizing the interaction mechanism of the tunnel landslide system at home and abroad according to the relative position relationship between the 2# landslide and the tunnel,we simulate and analyze the influence of sliding on the tunnel structure during operation by FLAC3 D threedimensional numerical simulation analysis method is adopted to slide the landslide body during the operation. The two lining stress characteristics and safety of the tunnel under the condition of different minimum distance（ 1 D-4 D）of the tunnel vault distance to the minimum distance of the sliding surface of the tunnel are provided for reference and engineering basis for the construction of tunnel engineering under similar conditions in the future.