模拟降水井的以缝代井列调整流量法

在基坑开挖工程中,井点降水是常用的降水方法。在基坑渗流数值计算中,降水井的模拟显得尤为重要。文中根据降水井实际工作机理,在以缝代井列模拟排水孔幕的基础上,采用以缝代井列调整流量法来模拟降水井,通过校正缝水位和缝周渗透系数来实现流量误差的调整。算例分析表明,改变缝的设置范围、改变渗透系数的选取、改变降水时间,该法均能模拟出相应的降水效果,既符合工程实际,又便于工程应用,是模拟基坑开挖中降水井的实用方法。

Flow Adjustment Method of Fissure to Represent Line of Wells for Simulating Dewatering Well

During foundation pit excavation engineering,well-points dewatering is the common method.Simulation of dewatering well is so important in the numerical calculation of foundation pit seepage.In this paper,according to the work mechanism of dewatering well and based on simulation of drainage holes with the method of fissure to represent line of wells,dewatering well is simulated with flow adjustment method of fissure to represent line of wells to realize adjustment of flow error through regulating water level in the fissure and permeability coefficient around fissure.It is indicated from examples that this method can simulate the corresponding dewatering effect in different ranges of fissure,different permeability coefficients and different dewatering time,not only conforming to engineering practice but also convenient for engineering application,which is a practical method for simulating dewatering well during foundation pit excavation.