西安地铁永南区间隧道地表降水法设计与施工

Design and Implementation of Surface Dewatering in the Yongnan Running Tunnel of the Xi'an Metro

文章针对西安地铁二号线永宁门—南稍门区间隧道的工程概况、工程地质及水文地质条件,重点介绍了隧道基坑降水的设计方案和设计参数,以及根据区间地理位置、周边环境、水文地质变化情况进行的降水井配置和施工方案,并对其采取的动态管理进行了分析。得出的结论是:调整拱底标高、调节降水井深度可有效控制地下水;采用合适的机械、降水井结构及排水设施可减小对环境、地面交通的影响;进行动态管理,可有效控制降、排水效率。

In light of the project profile as well as the geological and hydrological conditions of the Yongdingmen- Nanshaomen running tunnel on the Xi＇an metro, this paper introduces the selected design option and parameters for dewatering in the tunnel foundation pit, presents the dewatering well allocation and construction considering the geo- graphical location and environmental and hydrological conditions, and analyzes the dynamic management measures undertaken in this project. It comes to the conclusion that the ground water can be effectively controlled by adjusting the level of the tunnel bottom and depth of the dewatering well; the impact on the environment and ground traffic will be mitigated by using proper machines, dewatering well structures, and devices： and the efficiency of drainage and dewatering will be improved through dynamic management.