Abstract：In order to study how the surface feature of reinforced geomembrane affects the reinforced geomembrane and geotextile interface shear strength，the fractal dimension D was calculated by cubic covering method and fractal geometry theory. Basing on the direct shear test，the correlation between the fractal dimension D and the shear strength of different reinforced geomembrane was gotten. It shows that the interface shear strength increases with the increase of fractal dimension D strengthen，so that fractal dimension could measure reinforced geomembrane and geotextile interface shear strength. And then，after revising the JRC-JCS model combined with inosculation ratio-JMC and experience factor ，the connection between the joint roughness coefficient(JRC) and the fractal dimension D was worked out with the shearing text，on the basis of which the experiential estimative equation of reinforced geomembrane and geotextile interface was derived. Finally，the calculation results were carried out with the experiential estimative equation，the comparison between the calculation results and the shear test results was conducted. Form the comparison，it shows that calculation results fit in with the test results，and the calculation accuracy and the achieved reliability of the equation can meet the requirements of engineering estimate.
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2015, Vol. 34 
