复杂环境下桥隧结合部边坡施工期稳定性分析

Stability analysis of bridge-tunnel junction slope during construction in complex environment

为了确保复杂环境下边坡地质体在施工过程中的安全与稳定,以云南绿汁江大桥玉溪岸隧道仰坡为研究对象,通过对该边坡区域背景和地质条件的调查,运用极限平衡和Midas/GTS NX数值计算两种方法,对正在施工的绿汁江大桥和大栗树隧道结合部的边坡进行不同工况下的稳定性分析,并试图探明两种方法在边坡稳定性计算中的优劣与异同。结果表明:天然工况下,边坡稳定;暴雨或持续降雨工况下,边坡处于欠稳定状态。两种方法的计算结果基本一致,可以认为该边坡稳定性分析合理。

In order to ensure the safety and stability of the slope during construction, this paper took the front slope of Yuxi’an tunnel of Lvzhijiang Bridge in Yunnan Province as the research object.Through the investigation of the regional background and geological conditions of the slope, the stability of the slope at the junction of Lvzhijiang Bridge and Dalishu tunnel under different working conditions was analyzed by using the methods of rigid limit equilibrium and MIDAS/GTS NX numerical calculation.This paper attempted to explore the advantages, disadvantages and similarities of the two methods in the calculation of slope stability.The results showed that the slope was stable under natural conditions;Under the condition of rainstorm or continuous rainfall, the slope was in an unstable state.The calculation results of the two methods were basically consistent, which could be considered that the slope stability analysis was reasonable.