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《Journal of Wuhan University of Technology》 2010-14
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Research on Mutil-shear Strength Criterion Based on Partical Swarm Optimization

ZHANG Xue-ying1,2,RUAN Huai-ning1,LIANG Pei-xin2,HU Ai-yu2(1.Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,China;2.Department of Architectural Engineering,Nanjing Institute of Technology,Nanjing 211167,China)  
Considering the interaction of three principal shear stress and three normal stress,octahedral shear stress and normal stress and three primary stress acting on the 26-polyhedron model,a new mutil-shears strength criterion is proposed. It is based on analysis of Mohr-coulomb strength criterion,Drucker-Prager strength criterion,liner and nonlinear unified strength theory and three shear strength criterion.Based on the exiting true triaxial experiment result,using the Partical Swarm Optimization,the parameters of shears strength criterion are finded out.Comparing with Mohr-Coulomb strength criterion,three shear strength criterion,triple shear energy yield criterion and twin shear theory,the results show that multi-shear strength criterion agrees with the experiment well,for all kinds of rocks.Also aiming at numerous strength theory,qualitative analysis in meridian plane or π plane only,direct comparison in σ1-σ2 plane is added particularly.The results indicate that multi-shear strength criterion has good applicability and high promotional value.
【Fund】: 国家重点工程项目(2005805715);; 国家自然科学重点基金(50539090)和国家自然科学基金(50674040)
【CateGory Index】: TU452
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