Abstract: 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.

Key words: design method of integrated precipitation and recharge, equivalent large well method, coupling influence factor, fully penetrating well