水平井基坑降水的数学模型及应用

对于水平井的降水计算，提出了水平井等效渗透系数的新概念及其计算公式，可将水平井实际很复杂的边界条件移置到井口处，使计算简化；对抽水竖井的三维数值模拟提出了一种特殊井单元的处理方法；对潜水自由面提出了相适应的流量边界条件及其确定方法；建立了水平井降水和水平井与抽水竖井联合降水的数学模型；论证了水平井井内水流非等水头分布、也非等强度分布的观点。

Mathematical Model and Its Application of Horizontal Well Dewatering in Foundation-Pit

Concerning the dewatering calculation of the horizontal well, this paper presents a new concept of equivalent coefficient of permeability as well as the related calculation formula, which can simplify the calculation by displacing the actually complex boundary condition to the mouth of well. Also, it suggests a special disposal method for the tri-dimensional numerical pumping simulation of vertical well as well as the related boundary conditions of flux and its ascertaining method of free water level. The numerical model of dewatering with the horizontal well and the conjunction of horizontal well with vertical well is built. At the same time, this paper evaluates the viewpoint of the non-equivalent water head distribution and the non-equivalent intensity distribution of water flow in the horizontal well.