Kozeny-Carman(KC)equation is a well-known relation between hydraulic conductivity and pore properties in porous material.The applications of KC equation to predicting saturated hydraulic con-ductivities of sands and non-expansive soils are well documented.However,KC equation is incapable of predicting saturated hydraulic conductivity of expansive soil(e.g.bentonite)well.Based on a new dual-pore system,this study modified KC equation for improving the prediction of saturated hydraulic con-ductivities of bentonites.In this study,an assumption that inter-layer space(micropore)has limited effect on fluid flow performance of compacted bentonite was adopted.The critical parameters including total porosity and total tortuosity in conventional KC equation were replaced by macroporosity and tortuosity of macropore,respectively.Macroporosity and microporosity were calculated by basal spacing of compacted bentonite,which was estimated by assuming that specific surface area is changeable during saturation process.A comprehensive comparison of bentonite's saturated hydraulic conductivity predictions,including modified KC equation proposed in this study,conventional KC equation,and prediction method based on diffuse double layer(DDL)theory,was carried out.It was found that the predicted saturated hydraulic conductivity of bentonites calculated using modified KC equation fitted the experimental data better than others to a certain extent.

Kunlin Ruan;Xian-Lei Fu

Department of Civil and Environmental Engineering,Waseda University,Tokyo,169-8555,Japan;Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety,Institute of Geotechnical Engineering,Southeast University,Nanjing,210096,China

岩石力学与岩土工程学报（英文版）

[1]Kunlin Ruan;Xian-Lei Fu-.A modified Kozeny-Carman equation for predicting saturated hydraulic conductivity of compacted bentonite in confined condition)[J].岩石力学与岩土工程学报（英文版）,2022(03):984-993

ductivities,macroporosity,Macroporosity

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