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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 energyof rock burst were proposed whether the slope of the post-peak shear stress-shear deformation curve is positive or not. The analyticalsolutions show that shear stress level, confining pressure, shear strength, brittleness, strain rate and heterogeneity of rock materialshave 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 und
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 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 analyticalsolutions show that shear stress level, confining pressure, shear strength, brittleness, strain rate and heterogeneity of rock materialshave 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 bur st is expected und