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Upper bound analysis of ultimate pullout capacity of shallow 3-D circular plate anchors based on nonlinear mohr-coulomb failure criterion

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Journal of Central South University 2018年第9期25卷 2272-2288页

作者： ZHAO Lian-heng TAN Yi-gao HU Shi-hong DENG Dong-ping YANG Xin-ping School of Civil Engineering Central South University Key Laboratory of Heavy-haul Railway Engineering Structure of Ministry of Education Central South University

Based on the nonlinear mohr-coulomb failure criterion and the associated flow rules,the three-dimensional(3-D)axisymmetric failure mechanism of shallow horizontal circular plate anchors that are subjected to the ultimate pullout capacity(UPC)is determined.A derivative function of the projection function for projecting the 3-D axisymmetric failure surface on plane is deduced using the variation *** using difference principle,the primitive function of failure surface satisfying boundary condition and numerical solution to its corresponding ultimate pullout capacity function are *** influences of nonlinear mohr-coulomb parameters on UPC and failure mechanism are *** result shows that UPC decreases with dimensionless parameter m and uniaxial tensile strength increases but increases when depth and radius of plate anchor,surface overload,initial cohesion,geomaterial density and friction angle *** failure surface is similar to a symmetrical spatial funnel,and its shape is mainly determined by dimensionless parameter m;the surface damage range expands with the increase of radius and depth of the plate anchor as well as initial cohesion but decreases with the increase of dimensionless parameter m and uniaxial tensile strength as well as geomaterial *** the dimensionless parameter m=2.0,the numerical solution of UPC based on the difference principle is proved to be feasible and effective through the comparison with the exact *** addition,the comparison between solutions of UPC computed by variation method and those computed by upper bound method indicate that variation method outperforms upper bound method.

关键词： shallow circular plate anchors ultimate pullout capacity variation analysis nonlinear mohr-coulomb failure criterion upper bound limit analysis

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