南水北调中线北汝河渠道倒虹吸深基坑降水减压数值模拟

Numerical Simulation of Deep Foundation Pit Dewatering for Beiru River Inverted Siphon on the Middle Route to South-to-North Water Diversion Project

降水减压是北汝河渠道倒虹吸工程的难点,通过工程区水文地质的分析和概化,基于Modflow软件,建立了倒虹吸深基坑降水减压条件下的地下水三维渗流数值模拟模型,通过模型识别,确定了研究区水文地质参数,利用识别后的数值模型对5个不同深基坑降水减压方案的地下水流场进行了预测,确定了降水减压最优方案.

Based on the analysis and summary to the geological and hydrogeological conditions of the area, ground- water numerical simulation of the deep foundation pit dewatering for Beiru river inverted siphon is set up by using Modflow. Hydrogeologic parameters of the area is obtained by model identification. The numerical simulation of dewatering is applied to 3-D groundwater flow field simulation of 5 dewatering schemes. According to the groundwater table in the foundation and pumping wells quantity, the optimal dewatering scheme is derived.