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《北京科技大学学报(英文版)》 2004-03
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Quantitative calculation for the dissipated energy of fault rock burst based on gradient-dependent plasticity

Xuebin Wang;Shuhong Dai;Long Hai Department of Mechanics and Engineering Sciences, Liaoning Technical University, Fuxin 123000, China  
The capacity of energy absorption by fault bands after rock burst was calculated quantitatively according to shear stress- shear deformation curves considering the interactions and interplaying among microstructures due to the heterogeneity of strain sof- tening rock materials. The post-peak stiffness of rock specimens subjected to direct shear was derived strictly based on gradient- dependent plasticity, which can not be obtained from the classical elastoplastic theory. Analytical solutions for the dissipated energy of rock burst were proposed whether the slope of the post-peak shear stress-shear deformation curve is positive or not. The analytical solutions show that shear stress level, confining pressure, shear strength, brittleness, strain rate and heterogeneity of rock materials have important influence on the dissipated energy The larger value of the dissipated energy means that the capacity of energy dissi- pation in the form of shear bands is superior and a lower magnitude of rock burst is expected under the condition of the same work done by external shear force. The possibility of rock burst is reduced for a lower softening modulus or a larger thickness of shear bands.
【Fund】: This work was financially supported by the National Natural Science Foundation of China (No.50309004).
【CateGory Index】: P584
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