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| ESTABLISHMENT OF UNIFIED STRAIN ENERGY STRENGTH CRITERION OF HOMOGENEOUS AND ISOTROPIC HARD ROCKS
AND ITS VALIDATION |
| QIU Shili1，FENG Xiating1，ZHANG Chuanqing1，HUANG Shuling1，2 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China) |
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Abstract The basic characteristics of strength and strength criterion of hard rock are studied based on the analysis of the results of multiaxial loading and unloading tests of hard rock；it is shown that the multiaxial loading and unloading strengths of hard rock have intermediate principal stress effect，minimum principal stress effect，hydrostatic pressure，stress Lode angle effect and difference effect under tension and compression. This paper presents a deviatoric plane shape function，characterized by two parameters transiting between Rankine type strength curve and Drucker-Prager type strength curve. Combined with modified meridian plane shape function of Wiebols-Cook strength criterion based on effective strain energy，an isotropic unified strength criterion of hard rock is constituted. Many loading and unloading test data of hard rocks have validated that the strength criterion can reflect objectively the basic characteristics of the strength of isotropic hard rock and the nonlinear characteristics of hard rock strength. Through parameter adjustment，the unified strain energy strength criterion presented in this paper unified many current strength criteria to one strength theory，which makes the numerical realization of strength theory more convenient. The unified strain energy strength criterion is applicable for various isotropic hard rocks，so as to further enrich the research achievements of unified strength theory.
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Received: 29 October 2012
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2013, Vol. 32 
