三维地下水数值模拟方法在基坑涌水量预测中的应用--以广州地铁某基坑为例

目前基坑涌水量常采用大井法来进行预测,但是对于水文地质条件复杂且不符合裘布依井流公式适用条件的情况时,就不适用大井法预测涌水量。本文以广州地铁某车站基坑涌水量预测为例,来探讨采用数值模拟软件VisualModflow解决这一问题的方法:在水文地质条件分析的基础上,建立合适的水文地质概念模型并确定数值模型,划分水均衡区,最终通过水均衡的计算来求基坑内涌水量。

Application of 3D Groundwater Numerical Simulation to the Forecast of Flowing Yield in Foundation Pit

The discharge of foundation pit is often forecasted by using the method of the generalized large well, but under the conditions of the complicated hydrogeological conditions where the Dupit well flow formula is not suitable, the said method is not applicable. Based on the forecast of flowing yield of the foundation pit for certain station of Guangzhou Metro, the solution for the above problem is discussed through adopting numerical simulation software Visual Modflow. According to the analysis on the hydrogeological conditions the hydrogeologic concept model and the numerical model are developed. The balance zone of groundwater is planed out and the discharge of foundation pit is obtained by the calculation of the balance area.