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首页> 外文期刊>Theoretical and Applied Fracture Mechanics >Dynamic damage localization in crack-weakened rock mass: Strain energy density factor approach
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Dynamic damage localization in crack-weakened rock mass: Strain energy density factor approach

机译：裂纹弱化岩体的动态损伤定位：应变能密度因子方法

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摘要

The key failure mechanism of rock mass subjected to compressive loads is due to the damage localization. Conventional methods can not be applied to study the dynamic damage localization physical behavior of crack-weakened rock mass. The strain energy method has the capability to investigate the dynamic damage localization feature in crack-weakened rock mass. Therefore, in order to analyze the dynamic damage localization behavior, strain energy density factor approach is adopted in this paper. A two-dimensional model with periodic rectangular noncollinear array of cracks is established. Then, the onset condition of periodic distribution cracks in rock mass is obtained using strain energy density factor approach. By analyzing the bifurcation of crack growth pattern, the critical length and stress of damage localization of crack-weakened rock mass is determined as well as the location of damage localization. In addition, parameters sensitivity analysis is carried out, the effects of the length of crack, friction coefficient, fracture toughness, confining stress, velocity of crack growth, inclination and spacing between lines and rows on the onset condition for damage localization and bifurcation pattern of rocks are discussed. It can be concluded that onset condition of damage localization is mainly affected by its distribution of initial cracks. (C) 2017 Elsevier Ltd. All rights reserved.
机译：对压缩载荷进行压缩载荷的岩体的关键故障机制是由于损坏定位。常规方法不能应用于研究裂纹弱化岩体的动态损伤定位物理行为。应变能量方法具有研究裂纹弱化岩体中的动态损伤定位特征的能力。因此，为了分析动态损伤定位行为，本文采用应变能密度因子方法。建立了具有周期性矩形非可折叠脉冲阵列的二维模型。然后，使用应变能密度因子方法获得岩体中周期分布裂缝的起始条件。通过分析裂缝生长模式的分叉，确定裂纹弱化岩体损伤定位的临界长度和应力，以及损伤定位的位置。此外，进行参数灵敏度分析，裂缝长度，摩擦系数，断裂韧性，限制应力，裂缝生长的速度，线条和行之间的倾斜和间隔的效果，对损伤定位的起始条件和分支模式讨论了岩石。可以得出结论，损害定位的发病条件主要受其初始裂缝分布的影响。 （c）2017 Elsevier Ltd.保留所有权利。

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