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| ANALYSIS OF MARBLE FAILURE ENERGY EVOLUTION UNDER LOADING AND UNLOADING CONDITIONS |
| ZHANG Liming1，2，GAO Su1，WANG Zaiquan1，CONG Yu1 |
| (1. College of Science，Qingdao Technological University，Qingdao，Shandong 266033，China；2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China) |
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Abstract According to the results of marble loading and unloading tests，marble failure characteristics and energy evolution under different stress paths are studied. Results show that the absorbed total energy of conventional triaxial compression is higher than that of uniaxial compression. The release velocity of elastic strain energy under conventional triaxial compression is slower than that of uniaxial compression after peak strength. The energy storage limit of conventional triaxial compression is higher than that of uniaxial compression. The peak strength and peak strain increase with the initial confining pressure increasing. Marble failure mode transfers from tension-shear failure to shear failure. The absorbed total energy and elastic energy increase. But the dissipated energy has no significant change. Confining pressure has no significant effect on the rate of and . The peak strength and peak strain decrease with the unloading velocity increasing. Marble failure mode transfers from shear failure to tension-shear failure. The absorbed total energy and elastic energy decrease. But the dissipated energy has no significant change. Unloading velocity has no significant effect on the rate of and . The absorbed total energy and peak strength are in a linear relationship. The energy storage limit and peak strength are also in a linear relationship.
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Received: 11 December 2012
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2013, Vol. 32 
