Abstract：The triaxial unloading tests of hard limestone are carried out. The mechanical properties changing with unloading stress path are studied. Five strength criteria are studied based on experimental results. Mohr-Coulomb criterion and Hoek-Brown criterion don?t describe the strength property of rock unloading failure. Drucker-Prager criterion and Mogi-Coulomb criterion fit experimental results very well. Mogi-Coulomb criterion fits experimental results better than Drucker-Prager criterion by comparison. The parabolic criterion is the best choice if the failure confining pressure is high. A rock unloading failure constitutive model is modified for describing the characteristic of volumetric strain. The theoretical model agrees well with experimental results.
张黎明，王在泉，石 磊. 硬质岩石卸荷破坏特性试验研究[J]. 岩石力学与工程学报, 2011, 30(10): 2012-2018.
ZHANG Liming，WANG Zaiquan，SHI Lei. EXPERIMENTAL STUDY OF HARD ROCK FAILURE CHARACTERISTIC UNDER UNLOADING CONDITION. , 2011, 30(10): 2012-2018.
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2011, Vol. 30 
