论文部分内容阅读
弱透水层的水文地质参数,对于基坑降水和地下结构的设计都是不可缺少的重要指标。但由于渗透性较差,在抽水试验中的抽水井持续很短时间就疏干,因此对于渗透性较弱的透水层水文地质参数的正确求取存在很大的困难。本文以长春市宏亿数码广场基坑降水求参过程为例,在进行了多次短时间的抽水试验后,利用所得数据采用了传统的地下水动力学求参公式和全程曲线拟合法对目的含水层进行参数的求取。然后利用Visual Modflow软件,建立了合理的渗流计算模型,通过观测水位数据对所求参数进行修正,不断调整模型中的水文地质参数,使模拟流场与实际流场拟合,从而得到更接近于实际情况的水文地质参数,取得了良好的效果。
The hydrogeological parameters of the aquitard are indispensable for the design of foundation pit dewatering and underground structures. However, due to the poor permeability, the pumping wells in the pumping test continued to drain for a short time. Therefore, it is very difficult to get the right parameters of the hydrogeological parameters of the permeable layer with weak permeability. Taking Changhong Hongyi Digital Plaza pit as an example, after taking several short-time pumping experiments, this paper uses the traditional groundwater hydrodynamics formula and the whole curve fitting method to calculate the target water content Layers to determine the parameters. Then, using Visual Modflow software, a reasonable seepage calculation model is established, and the required parameters are corrected by observing the water level data, and the hydrogeological parameters in the model are adjusted continuously so that the simulated flow field and the actual flow field are fitted so as to be closer to The actual situation of hydrogeological parameters, and achieved good results.