ERROR ANALYSIS OF STORAGE-VARIABLE TRANSIENT PULSE METHOD FOR PERMEABILITY MEASUREMENT
WANG Ying，LI Xiaochun，WEI Ning
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics， Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Storage-variable transient pulse method is an advanced permeability measurement method for its properties of fast operation(testing time less than 2.5 h)，large range(testing range from 10－7 D to 10－1 D) and high precision(testing error less than 5%). First of all，the theoretical features，design principles and testing processes of this new method have been introduced. And then，the methodological and technological error sources have been discussed，including the device attached，the surroundings influenced and man-made produced. All the error sources have been classified to 6 kinds of error factors which have a great impact on measurement testing. The impactions have been analyzed categorically and systematically by using ANSYS modelling. The last but not the end，matters needing attention during design，manufacture and operation have been discussed，moreover，useful ways and means which can cancel error factors or reduce error effects have been proposed. As a result，the device will be improved，and the testing will be rather rational，and the precision will be furthermore accurate.
