深基坑水文地质参数的确定及降水设计

Determination of Hydrogeology Parameters and Dewatering Design of Deep Foundation Pit

深基坑水文地质参数的确定是基坑降水设计成功与否的关键。本文以上海虹口商城深基坑降水工程为例,运用现场抽水试验确定的水文地质参数,建立三维非稳定渗流模型,并借助三维有限差分数值模拟软件求解三维非稳定渗流微分方程,模拟坑内、外渗流场的变化情况,再和现场水位实测数据进行对比,验证了此模型在工程应用中的合理性和准确性,从而为该深基坑降水工程的设计、施工和管理提供了理论依据。基于上述成果,设计出了对应的降水方案,取得良好的实际效果。

Determination of hydrogeology parameters of deep foundation pit is essential for foundation dewatering design.Based on the dewatering project of deep foundation pit for Hongkou Mansion in Shanghai,pumping tests are applied to determine the hydrogeology parameters.And a three-dimensional seep model is established.Using a three dimensional finite-difference numerical simulation software,the finite difference method is adopted to calculate the three-dimensional seep model.Comparison of the measured results with the numerical results shows that the model is quite reasonable and effective and it can be used to provide theory evidence to dewatering design,construction and management of deep foundation pit project.Based on the above achievement,a dewatering design of deep foundation pit is proposed,good practical results are achieved.