潜水层一体化降水回灌设计方法研究

A design method of integrated dewatering and recharge in phreatic zone

将降水工程抽取的地下水进行资源性回灌是高渗透性富水地层地下水控制中保护地下水资源的一种有效选择。当回灌场地受限离降水影响区域不够远时,降水与回灌可能存在耦合作用。基于潜水完整降水-回灌井群的浸润线方程,建立了一体化降水回灌井点群系统等流量近似理论解和等效大井近似理论解公式,并进行了误差分析。以北京某基坑工程为例,一体化降水回灌工程的近似理论解、数模分析、流量实测三者结果能互相符合,验证了公式的可靠性。给出了应用公式进行场地受限条件下一体化降水回灌设计问题的求解思路、求解步骤,建立了潜水完整井的一体化降水回灌设计方法。

Resource recharge of groundwater extracted from dewatering project is an effective choice to protect groundwater resources in groundwater control of high permeability water-rich strata. When the recharge site is not far enough away from the dewatering affected area, there may be coupling effect between dewatering and recharge. Based on the phreatic line equation of fully penetrating well dewatering-recharge well group, the approximate theoretical solutions of equal flow rate and equivalent large well for integrated dewatering-recharge well point group system are derived, and the errors are analyzed. A foundation pit project in Beijing are analyzed as an example, and it is found that the results of the approximate theoretical solution, numerical modeling analysis and flow measurement of the integrated dewatering and recharge project are consistent with each other, which verifies the reliability of the formula. The solution idea and solution steps of the integrated dewatering and recharge design problem under site limited conditions by using the formula are given to establish the integrated dewatering and recharge design method of the complete phreatic well.