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<p>To clarify the mechanism of coal damage under disturbance influencing on the level of outburst risk, the stress evolution paths during the outburst inoculation were deduced. The physical experiments containing gas were first conducted to clarify the influence of gas pressure on coal damage under different stress paths. Then, the micro-macro influence mechanism of stress paths on coal damage was further clarified using numerical simulations without gas. By comparing of results of the 2 methods, the similarities and differences in the influence on coal damage were clarified between the gas pressure and stress path. Finally, the influence mechanism of coal damage on the level of outburst risk was revealed. The results showed that the gas pressure did not affect the failure types of coals, which are crucially determined by the stress path. For the stress loading/unloading mode where the coals were more easily damaged, the complexity of the coals after failure was relatively weak. Besides, the stress mode had a relatively larger proportion of energy used for structure damage within the coals. The increase of gas pressure in coals induced the damage more easily, and accelerated the failure suddenness with increasing failure degree of coals. Therefore, the level of outburst risk increased. However, for in situ stress, the increased disturbance intensity would make coals more easily damaged and increase the damage speed, but it does not necessarily mean that the level of outburst risk is relatively higher. There was a non-absolute positive correlation between the magnitude of in situ stress and the level of outburst risk. Besides, the outburst intensity of coals were largely decided by the stress loading/unloading mode. Therefore, differentiated gas control level should be implemented for different mining modes, such as strengthening the gas drainage effect of coals under sudden stress unloading. In addition, the stress load and direction distribution of the coals can be controlled by adjusting the driving speed and sequence, which can correspondingly reduce the degree of coal damage and decrease the level of outburst risk.</p>

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Dynamic Damage Law of Coals Under Stress Paths for Disaster Inoculation and Its Influence Mechanism on Outburst Risk Level

  • 期刊论文

  • 发表日期：

    2025年12月14日

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  • Chaojie Wang,
  • Chaofan Ge,
  • Buzhuang Zhou,
  • Xiaowei Li,
  • Hanpeng Wang,
  • Yanwei Zhang,
  • Bingwei Nan,
  • Changhang Xu

摘要

To clarify the mechanism of coal damage under disturbance influencing on the level of outburst risk, the stress evolution paths during the outburst inoculation were deduced. The physical experiments containing gas were first conducted to clarify the influence of gas pressure on coal damage under different stress paths. Then, the micro-macro influence mechanism of stress paths on coal damage was further clarified using numerical simulations without gas. By comparing of results of the 2 methods, the similarities and differences in the influence on coal damage were clarified between the gas pressure and stress path. Finally, the influence mechanism of coal damage on the level of outburst risk was revealed. The results showed that the gas pressure did not affect the failure types of coals, which are crucially determined by the stress path. For the stress loading/unloading mode where the coals were more easily damaged, the complexity of the coals after failure was relatively weak. Besides, the stress mode had a relatively larger proportion of energy used for structure damage within the coals. The increase of gas pressure in coals induced the damage more easily, and accelerated the failure suddenness with increasing failure degree of coals. Therefore, the level of outburst risk increased. However, for in situ stress, the increased disturbance intensity would make coals more easily damaged and increase the damage speed, but it does not necessarily mean that the level of outburst risk is relatively higher. There was a non-absolute positive correlation between the magnitude of in situ stress and the level of outburst risk. Besides, the outburst intensity of coals were largely decided by the stress loading/unloading mode. Therefore, differentiated gas control level should be implemented for different mining modes, such as strengthening the gas drainage effect of coals under sudden stress unloading. In addition, the stress load and direction distribution of the coals can be controlled by adjusting the driving speed and sequence, which can correspondingly reduce the degree of coal damage and decrease the level of outburst risk.