Determination of Permeability Coefficient of Concealed Karst Fractures Using Slug Test in Daxing of Beijing
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Abstract:
Slug test is an important method to determine the permeability of rock and soil masses. In this paper, the permeability of the concealed Ordovician karst-fractured limestone aquifer in Daxing of Beijing was estimated. The production wells were selected according to the in-situ conditions, and the slug test design included the pump-off water level recovery method recorded by auto-monitoring system, HSZK oscillation method, and injection method. The results showed that the permeability obtained from the slug test is less than that determined by the conventional pumping test. The discrepancy was mainly due to the difference of influence radius in different test methods, and slug test can reflect the permeability at the local scale more accurately. Additionally, it is necessary to reduce or avoid the well skin effect while performing the slug test in the fracture and karst medium. The realization of instantaneous water level change needs to be conducted when designing the slug test and the plug-sealing sectional test can be used in the main fractures.
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