Quantitative calculation for the dissipated energy of fault rock burst based on gradient-dependent plasticity
Quantitative calculation for the dissipated energy of fault rock burst based on gradient-dependent plasticity
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发表时间：
2004
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通讯作者：
XuebinWang;ShuhongDai;Longhai
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作者：
XuebinWang;ShuhongDai;Longhai
考虑应变软化岩石材料的非均质性导致微结构之间的相互作用和相互作用，根据剪应力-剪切变形曲线定量计算岩爆后断层带吸收能量的能力。直接剪切作用下岩石试件的峰后刚度是严格根据梯度相关塑性推导的，而经典弹塑性理论无法获得这一点。提出了峰后剪应力-剪切变形曲线斜率是否为正时岩爆耗散能量的解析解。解析解表明，岩石材料的剪应力水平、围压、剪切强度、脆性、应变速率和非均质性对耗散能有重要影响。耗散能值越大，意味着剪切带形式的能量耗散能力越强，在外剪力做相同功的情况下，预计发生的岩爆震级越低。软化模量越低或剪切带厚度越大，岩爆的可能性就越小。
The capacity of energy absorption by fault bands after rock burst was calculated quantitatively according to shear stressshear deformation curves considering the interactions and interplaying among microstructures due to the heterogeneity of strain softening rock materials. The post-peak stiffness of rock specimens subjected to direct shear was derived strictly based on gradientdependent 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 dissipation 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.