Study on Optimal Pumping Design for Dewatering of Deep Excavation Site in Multilayred Aquifers

提出了一种基坑降水的优化设计方法。它预测了最佳数量的深威尔斯，他们的位置，并需要保持在稳定和非稳定状态下的地下水位低于规定的海拔抽水率。本文提出的方法是用线性规划法确定稳定状态下的抽水量，用AIC法建议最佳深井位置，并包括二维稳定渗流的有限元分析。采用非线性最小二乘算法结合非稳定渗流有限元分析，计算在规定时间内地下水位低于指定高程所需的抽水量。该方法被应用到几个实例中的一个大型基坑降水的潜水含水层模型。

An optimal design method is presented for dewatering a excavation site. It predicts the optimum number of deep wells, their locations, and the rate of pumping needed to maintain ground water levels below specified elevations at steady and unsteady state. In our proposed method a linear programming method is used to determine the pumping rate at steady state and AIC is used to suggest the optimum deep well locations.This is accomplished by including the finite element analysis of two-dimensional steady seepage flow. Nonlinear least-squares algorithm incorporating finite element analysis of unsteady seepage flow is used to compute the pumping rate required to reach ground water levels below appointed elevation in a prescribed time. The method is applied to several examples of dewatering for a large excavation site in unconfined aquifer models.