基于GIS的厦门海底隧道涌水预报系统研究

Study of Forecasting System for Water Inflow under High Pressure in Xiamen Submarine Tunnel Construction Based on GIS

应用GIS技术开发海底隧道施工涌水预报系统,实现涌水量动态预测,为施工安全提供技术决策。研究中涌水量的预测采用了解析法和数值模拟方法。技术路线为根据工程施工前的地质勘探资料,进行隧道的涌水量预测,其成果作为背景数据库存放在评价系统中。结合隧道施工过程中的地质信息和地下水信息,对涌水量模型参数进行修正,利用修正后的参数,更新涌水预测评价的基础数据库,以更新后的结果作为施工前方涌水量预测结果。系统实现了海底隧道涌水的动态预测,在厦门海底隧道工程施工应用中表明:系统可为隧道安全开挖中的探水工作提供相对正确而直观的水文地质依据和工程技术保障。

This paper studies the development of a forecasting system for water inflow under high pressure in submarine tunnel construction with the application of GIS technology,which can realize the dynamic forecast of water inflow in order to provide technical solutions for construction safety.The study adopts an analytical method and a numerical simulation method to forecast the volume of water inflow.The technological route is to conduct the forecast of water inflow volume in tunnels on the basis of geological investigation information before engineering construction.The result of the forecast will be kept in the evaluation system as background databases.Combined with the geology and groundwater information during the tunnel construction process,the model parameters of water inflow volume is revised and the foundation database for the forecasting evaluation of water inflow is updated with the parameters revised.Hence,the updated result can be used as the forecasting evaluation result of the volume of water inflow in future construction.The system realizes the dynamic forecasting of water inflow under high pressure in submarine tunnels.The application of this system in Xiamen Submarine Tunnel construction indicates that the system can provide a relatively correct and visual hydrogeology basis and engineering guarantee for water detection in safe tunnel excavation.