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Improved slope safety analysis by new Druker-Prager type criterion

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Abstract

Based on Mohr-Coulomb (M-C) criterion, the parameters of Druker-Prager (D-P) criterion for geomaterial were determined under non-associated flow rule, and thus a new D-P type criterion was presented. Two assumptions were employed during the derivation: 1) principal strains by M-C model and D-P model are equal, and 2) the material is under plane strain condition. Based on the analysis of the surface on π plane, it is found that the proposed D-P type criterion is better than the D-P criterion with M-C circumscribed circle or M-C inscribed circle, and is applicable for stress Lode angle less than zero. By comparing the predicted results with the test data of sand under plane strain condition and other D-P criteria, the proposed criterion is verified and agrees well with the test data, which is further proved to be better than other D-P type criteria in certain range of Lode angle. The criterion was compiled into a finite difference package FLAC3D by user-subroutine, and was used to analyze the stability of a slope by strength reduction method. The predicted slope safety factor from the proposed criterion agrees well with that by Spencer method, and it is more accurate than that from classic D-P criteria.

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Foundation item: Project(2010B14814) supported by the Fundamental Research Funds for the Central Universities of China; Project(200801133) supported by the Ministry of Water Resources of China for Public Welfare Profession; Project(50809023) supported by the National Natural Science Foundation of China

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Zhu, Jg., Peng, K., Shao, J.F. et al. Improved slope safety analysis by new Druker-Prager type criterion. J. Cent. South Univ. Technol. 19, 1132–1137 (2012). https://doi.org/10.1007/s11771-012-1119-x

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  • DOI: https://doi.org/10.1007/s11771-012-1119-x

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