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Abstract Coarse-grained soil permeability coefficient can be calculated using the easy-measured and conventional parameters，which are related to its permeability. So，it has important theoretical significance to research the similar empirical formula of clay. Considering the influence of adsorbed water layer on clayey permeability characteristics，the invalid and efficient void ratio were defined first. Caculation formulas of the invalid and efficient void ratio were derivated by three methods，e.g.，the liquid limit，initial hydraulic gradient and double electric layer parameters of clay. Then，the empirical formulas of clay permeability coefficient were obtained by modifying the common empirical formulas of sand permeability coefficient. Finally，substituting the relevant physical parameters of the Jingyang loess，the soft clay in the south china sea and coastal saline soil of Kuwait into the empirical formulas of sand and clay permeability coefficient can figure out the value of permeability coefficient. Comparing with the measured value of laboratory test，the results show that the empirical formulas of clay permeability coefficient are reasonable. Kozeny-Carman and Stokes empirical formulas modified using the method of consistency index，are recommended by comparing the advantages and disadvantages of the empirical formulas and the three methods.
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2015, Vol. 34 
