In top coal caving mining, common impact occurs between coal gangue particles and tail beam. Little attention has been paid to the effects of coal gangue particles failure on impact force and tail beam response theoretically, numerically, and experimentally. This paper aims to reveal the influence of coal gangue particles failure on the impact effect of tail beam. First, this paper incorporates the theory of rock failure and energy consumption to assess the impact process of coal gangue particles on the tail beam. A new model to simulate the actual failure conditions of rock particles was developed: the brittle damage-fracture particle model. By comparing damage phenomena and simulation data, the brittle damage-fracture particle model was proved to be correct. Based on this model, a dynamic simulation of brittle coal gangue particles impacting the tail beam was conducted. Then, the dynamic responses of the particles and tail beam were analyzed. The results show that particle failure significantly affects the impact force and dynamic response of the tail beam. The impact effects of coal and gangue particles on the tail beam and their failure energy consumption also differed significantly. This paper stresses the importance of coal gangue particle failure conditions for research on top coal caving mining. Theoretical support is provided for the research of coal gangue identification technology based on the tail beam vibration signal.

中文翻译：

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基于岩石破坏的煤矸石颗粒与尾梁的撞击行为

在放顶煤开采中，煤矸石颗粒与尾梁之间经常发生碰撞。在理论上、数值上和实验上很少关注煤矸石颗粒破坏对冲击力和尾梁响应的影响。本文旨在揭示煤矸石颗粒破坏对尾梁冲击效果的影响。首先，本文结合岩石破坏和能量消耗理论，对煤矸石颗粒对尾梁的冲击过程进行评估。开发了一种模拟岩石颗粒实际破坏条件的新模型：脆性损伤-断裂颗​​粒模型。通过比较损伤现象和仿真数据，证明脆性损伤-断裂粒子模型是正确的。基于这个模型，对脆性煤矸石颗粒撞击尾梁进行了动态模拟。然后，分析了粒子和尾束的动力学响应。结果表明，粒子失效显着影响尾梁的冲击力和动力响应。煤和矸石颗粒对尾梁的冲击效果及其失效能耗也存在显着差异。本文强调了煤矸石颗粒破坏条件对放顶煤开采研究的重要性。为基于尾梁振动信号的煤矸石识别技术研究提供理论支持。结果表明，粒子失效显着影响尾梁的冲击力和动力响应。煤和矸石颗粒对尾梁的冲击效果及其失效能耗也存在显着差异。本文强调了煤矸石颗粒破坏条件对放顶煤开采研究的重要性。为基于尾梁振动信号的煤矸石识别技术研究提供理论支持。结果表明，粒子失效显着影响尾梁的冲击力和动力响应。煤和矸石颗粒对尾梁的冲击效果及其失效能耗也存在显着差异。本文强调了煤矸石颗粒破坏条件对放顶煤开采研究的重要性。为基于尾梁振动信号的煤矸石识别技术研究提供理论支持。