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Abstract Based on the analysis of energy transformation between testing machine and rock specimen，the energy dissipation law in process of unloading confining pressure failure and the relationships between energy and rock specimen deformation and confining pressure are analyzed comprehensively. The study results show that the energy dissipation is greatly related to the failure characteristic of rock specimen and confining pressure. The energy dissipation of ductile failure is greater than that of brittle failure. For the same failure mode，the energy dissipation obviously increases with the increasing confining pressure. Two unloading confining pressure tests show that the energy dissipation of rock specimen presents nonlinear relationship with time，while the energy dissipation of rock specimen presents linear relationship with lateral deformation. Under the same lateral deformation level，the greater the confining pressure is，the greater the energy dissipation is，and the rock specimen presents more brittle characteristic.
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Received: 14 April 2010
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2011, Vol. 30 
