兴隆水利枢纽深基坑开挖中的降水计算分析

Numerical Calculation of Precipitation During Excavation of Deep Foundation Pit in Xinglong Hydraulic Project

引入基于解析元方法的区域地下水软件GFLOW,应用到兴隆水利枢纽基坑排水工程的具体实例中,通过建立合适的模型,得到基坑开挖前的渗流场,对渗透系数的敏感性做出分析,对防渗墙深度做了论证;在降水方案选择上,通过对比降水效果,确定井间距,井流量以及井口数等参数,得到合适的降水方案;由此归纳出GFLOW处理区域地下水问题的特点:精度合理,建模方便,对各种水文要素模拟方便,输入参数简单方便,可视化程度好的优点。对比其他模型,修改参数方便,适应性强的特点。

Inviting the software GFLOW which solves groundwater problems based on Analytic Element Methoc （AEM）, and used in the project of Precipitation During Excavation of Deep Foundation Pit in Xinglong , according to establish proper model, getting the hydro - isobaric line before excavation; then analyzing the sensitivity of hydraulic conductivity, making validation about the depth of the cut - off wall. In the case choosing during dewater, according to compare the effect , getting the proper pumping parameter. Then getting the advantage of GFLOW in solving the regional groundwater problems： reasonable accuracy, easily model creating, easily simulating hydrology element, easily inputting the parameter, good visual interface. Comparing with other mathematic model it is convenient to modify parameter and had good adaptability.