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Abstract The bedded rocks have anisotropic and elastoplastic coupling mechanical properties. The elastic parameters of anisotropic rocks are the functions of plastic strain and loading angle. On this basis，triaxial cyclic loading and unloading tests of argillite with obviously bedded structures are designed and completed. The study results show that with the increase in plastic strain, the apparent elastic modulus decays exponentially，whereas the Poisson?s ratio increases. According to this phenomenon，two empirical functions are proposed to describe the relationships of apparent elastic modulus and apparent Poisson?s ratio vs. axial plastic strain and loading angle of rock specimens；and the values of related parameters are also obtained. The curved surface of apparent elastic modulus in the three-dimensional space changing with loading angle and plastic strain is drawn. The anisotropic degree of elastic modulus decreases with the development of plastic strain.
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Received: 16 August 2010
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2011, Vol. 30 
