A new method for calculating the aperture and roughness of fissure, and the effective radius of groundwater by using the response curve of a multistage pumping test is presented.

• 利用从层流到紊流的多阶段稳定压水试验的压力-流量曲线反算裂隙张开度、粗糙度及地下水影响半径等裂隙参数。