动态监测及其在四车道公路隧道施工中的应用

Staged Monitoring and Its Application in Construction of Four-Lane Highway Tunnel

目前四车道公路隧道的设计和施工经验相对不足,因而监控量测工作显得尤为重要。动态监测作为一个重要概念在文中得到阐述,认为监测工作是一个循环过程,需要在实践中不断修正;给出了完善的动态监测工作流程图,为工程类比和分析提供依据。同三、京珠国道主干线绕广州公路东环段龙头山隧道属单洞四车道特大断面公路隧道,进出口Ⅱ类围岩段地质条件恶劣,采用双侧壁导坑法施工。结合该工程,比较分析了设计的监测方案和结合工程实际所采取的监测方案,将动态监测应用于实践,论述了贯彻动态监测的重要意义。

The design and construction experiences of four-lane highway tunnel are relatively insufficient at present, therefore its monitoring seems particularly important. Staged monitoring has been introduced as an important concept. In practice, it is a circulating process, and should be modified according to the construction stage. A whole flow chart about staged monitoring has been given and can be used for engineering analogy and analysis. Longtoushan Mountain tunnel, which belongs to the Guangzhou east-ring segment of TONGSAN, JINGZHU national highway, is a four-lane large section highway tunnel. The geological condition of the rock at the entrance and exit of the tunnel is that of grade Ⅱ. In this section, the double-side-wall heading construction method has been adopted. Based on this project, the designed monitoring schemes and the practical monitoring schemes have been introduced and compared; the staged monitoring has been adopted and put into practice. The important significance of the staged monitoring has also been discussed.