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| EXPERIMENTAL STUDY OF ELASTOPLASTIC COUPLING DEFORMATION FOR TRANSVERSELY ISOTROPIC ROCKS |
| (1. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；2. School of Civil Engineering and Architecture，Central South University，Changsha，Hunan 410075，China；3. Hunan Provincial Communications Planning，Survey and Design Institute，Changsha，Hunan 410008，China；4. Guizhou Provincial Department of Transportation，Guiyang，Guizhou 550003，China) |
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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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| [1] AMADEI B. Importance of anisotropy when estimating and measuring in situ stresses in rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1996，33(3)：293–325.
[2] HAKALA M，KUULA H，HUDSON J A. Estimating the transversely isotropic elastic intact rock properties for in situ stress measurement data reduction：a case study of the Olkiluoto mica gneiss，Finland[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(1)：14–46.
[3] DUVEAU D，SHAO J F，HENRY J P. Assessment of some failure criteria for strongly anisotropic geomaterials[J]. Mechanics of Cohesive-frictional Materials，1998，3(1)：1–26.
[4] CAZACU O，CRISTESCU N D. A paraboloid failure surface for transversely isotropic materials[J]. Mechanics of Materials，1999，31(6)：381–393.
[5] TIEN Y M，KUO M C. A failure criterion for transversely isotropic rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(3)：399–412.
[6] PIETRUSZCZAK S，MROZ Z. Formulation of anisotropic failure criteria incorporating a microstructure tensor[J]. Computers and Geotechnics，2000，26(2)：105–112.
[7] PIETRUSZCZAK S. On inelastic behaviour of anisotropic frictional materials[J]. Mechanics of Cohesive-frictional Materials，1999，4(3)：281–293.
[8] PIETRUSZCZAKA S，LYDZBA D，SHAO J F. Modelling of inherent anisotropy in sedimentary rocks[J]. International Journal of Solids and Structures，2002，39(3)：637–648.
[9] LADE P V. Modeling failure in cross-anisotropic frictional materials[J]. International Journal of Solids and Structures，2007，44(16)：5 146– 5 162.
[10] DAFALIAS Y F. Il?iushin?s postulate and resulting thermodynamic condition on elastoplastic coupling[J]. International Journal of Solids and Structures，1977，13(3)：239–251.
[11] DAFALIAS Y F. Elastoplastic coupling within a thermodynamic strain space formulation of plasticity[J]. International Journal of Non-linear Mechanics，1977，12(5)：327–337.
[12] NIANDOU H，SHAO J F，HENRY J P，et al. Laboratory investigation of the mechanical behaviour of Tournemire shale[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(1)：3–16.
[13] 张 凯，周 辉，冯夏庭，等. 大理岩弹塑性耦合特性试验研究[J]. 岩土力学，2010，31(8)：2 425–2 434.(ZHANG Kai，ZHOU Hui，FENG Xiating，et al. Experimental research on elastoplastic coupling character of marble[J]. Rock and Soil Mechanics，2010，31(8)：2 425– 2 434.(in Chinese) ) |
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2011, Vol. 30 
