基于目标函数法基坑井群降水的井距优化设计

Optimal Design of Well Spacing in Foundation Pit Multi-well Dewatering Based on Objective Function

目的为了发挥井群干扰在基坑井点降水中的效果,取得合理井距,避免均匀布井降水效果不佳,减小降水对周围影响.方法在各个控制点水位降深达到设计降深的条件下,以各个控制点水位降深的最大值最小化为目标函数,运用MATLAB软件优化工具箱最大最小化进行优化求解,将优化结果与均匀布井进行对比分析.结果均匀布井控制点水位降深最大值与最小值之差为2.38 m,优化后为0.88 m,相比降低63.02%.结论该模型对基坑降水井群进行优化布置是可行的;在控制控制点水位降深方面,优化后的布置井距较均匀布井更加合理.

In order to achieve the proper effect of interference in multi-well dewatering,to obtain reasonable well spacing,to avoid the effect during the precipitation,and to reduce the impact on the surroundings,this paper sets up the model based on optimal objective function with the minimum of the maximum valve of the control points drawdown,under the condition of various control points achieving the design drawdown,using the MATLAB software to obtain the optimal solution,and conducts a comparative analysis of drawdown between optimization and evenly-arranged well spacing.The results show that the difference between the maximum and the minimun drawdown is 2.38 m in evenly-arranged well spacing,while the optimal result is 0.88 m which reduces by 63.02% comparatively.The conclusion is that the model used in foundation pit multi-well dewatering optimization is feasible;Compared with evenly-arranged well spacing,the optimal result is more reasonable in terms of controlling the drawdown of control points.