京张高速铁路明挖隧道基坑降水设计

针对京张高速铁路东花园隧道明挖基坑降水设计,通过勘察报告和现场降水试验得到降水区域水文地质参数,基于相关参数计算基坑涌水量,进而设计降水井数量、种类和深度。介绍了明挖隧道基坑自动化管井降水监测与分析管理系统,其可降低人工成本,实时监控并有效指导施工管理。经工程实践证明,明挖隧道基坑降水设计方案是可行有效的,能为类似明挖隧道基坑降水设计提供借鉴。

Groundwater Lowering Design for Foundation Pit of Open Cut Tunnel on Beijing-Zhangjiakou High Speed Railway

Aiming at groundwater lowering design for foundation pit of Donghuayuan Tunnel on Beijing-Zhangjiakou high speed railway,hydrogeological parameters of precipitation area were obtained through survey report and field precipitation test.According to relevant parameters,the water inflow of foundation pit was calculated,then the number,type and depth of dewatering wells were designed.The automatic monitoring and analysis management system of pipe well dewatering for open cut tunnel foundation pit was introduced.This system can reduce labor costs,real-time monitor the well state,and effectively guide tunnel construction management.The engineering practice proved that the design scheme of foundation pit dewatering in open cut tunnel is feasible and effective,which can provide reference for similar open cut tunnel foundation pit dewatering design.