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《Journal of Liaoning Technical University》 2005-06
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Study on conic for Mohr curve

LI Shun-qun, JIAO Xue-ying, WANG Fang (Department of Civil Engineering, Liaoning Institute of Technology, Jinzhou 121001,China)  
In order to research the non-linear damage of the kinds of the rock-soil material, based on results of direct and triaxial shear tests, a conic is established as Mohr yield curve and at the same time the formulas which illustrate the yield surfaces in primary stresses space are given too. Only two yield Mohr circles are needed for determining the curve just as for Mohr-Coulomb criterion. According to the proposed model, the yield curves on deviatoric plane are un-conformal curve hexagons and will undergo three phases which are smaller, larger and smaller than the yield curves got by Mohr-Coulomb criterion when hydraulic static pressure rises continuously from a negative value to a big positive one . Relationship between average principal stress and deviatoric shear stress can be obtained easily and directly with this model. The model can reflect the difference of soil's strength between pull and press stress states.
【Fund】: 辽宁省教育厅科学研究计划基金资助项目(2004F105)
【CateGory Index】: TU432
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