Abstract: Extensive direct shear tests on the reinforced soil mixed with shredded tire chips samples and regression analysis on the results are conducted to evaluate the shear strength of the reinforced soils and for the numerical analysis. This paper presents the elastoplastic approach for the shear strength of the reinforced soils. Based on the multivariable regression analyses on the test results, the regression model was established and calibrated with the monitored data. The results indicate that the adding of shredded tire chips can improve the performance of the reinforced soil with higher strain at the failure, higher tensile strength and less lateral deformation. The calculated results of the regression model are in good agreement with the measured values. Which can be used as the basis for the numerical analysis and calculation of shear strength of reinforced soil interface.

Key words: geotechnical engineering, reinforced soils, direct shear test, regression analysis