近郊区四洞并行大断面小净距隧道洞口浅埋段施工技术分析

Analysis on the Construction Technology of Shallow Buried Section at the Entrance of Four Parallel Hole Tunnels with Large Section and Small Interval in Suburbans

随着社会经济的发展,当前道路交通工程中原有的两车道公路已无法满足车辆快速通行需求,需将其拓展至四车道,此外还需增加两侧辅道。因此,在当前高速公路中,大跨径隧道及四洞并行小净距隧道应用较广。文章结合实际工程案例,以国道G316线A4标项目隧道出口进洞案例作为研究对象,分析了近郊区四洞并行超大跨径小净距隧道洞口浅埋段的施工工艺流程、施工方法及其注意事项,最后论述了超前地质预报与监控量测方法,以期为后续相关工程的研究提供理论参考。

With the development of social economy, the original two-lane highway in the current road traffic engineering has been unable to meet the rapid traffic demand of vehicles. It needs to be expanded to four lanes, and additional auxiliary roads on both sides are needed. Therefore, in the current expressways, large-span tunnels and tunnels with four parallel holes and small interval are widely used. Based on the actual engineering case, this paper takes the case of tunnel entrance at the exit of the A4 bid project of the National Highway G316 as the research object, and analyzes the construction process, construction methods and precautions of the shallow buried section at the entrance of the large-span tunnel with four parallel holes and small interval in the suburbs. Finally, the advanced geological prediction and monitoring measurement methods are discussed in order to provide theoretical references for the subsequent research of related projects.