Abstract
Constant flow pumping test is finished in the 7th shaft tunnel of Humaling,based on the measured data,permeability coefficient of tertiary system sandstone is calculated by using Boulton formula wiring method,lining method and water level recovery method.The value is 0.14～0.23 m/d,Providing a reliable basis for further engineering application.Compared this data with that permeability coefficient calculated by J.Dupuit method when pumping stability.The conclusion is that there have a critical value,the latter numerical value greater than the former when the distance of observation well and pumping well less than critical value,and gradually become smaller than the former with the distance of observation well and pumping well increase and greater than critical value.
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