Study on Difference of Permeability Coefficient Obtained by Hydrogeological Test in Ground Fissure Zone

In order to study the reason of different permeability coefficient obtained by pumping test and water injection test, based on the field test of ground fissures in Xi’an City, this paper analyzed the reasons that affect the results of the two tests by means of chart analysis and curve fitting. At the same time, the reasons for the different permeability coefficients of the upper and lower walls of ground fissures are analyzed. The results show that the permeability coefficient has a linear relationship with flow rate and drawdown. The permeability coefficient increases with the increase of discharge and decreases with the increase of drawdown. This phenomenon is related to the changes of capillary water and bound water. The difference of permeability coefficient between the upper and lower walls of ground fissures is also related to the content difference of bound water and capillary water.