层理煤的冲击破坏行为及其倾向性评价

doi:10.13722/j.cnki.jrme.2023.1071

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摘要冲击地压严重制约了深部煤炭资源的安全开采。从材料固有属性的角度，建立合理的冲击倾向性指标对评估冲击地压风险十分重要。鉴于层理结构对煤的力学行为存在显著影响，对不同层理角度煤样开展了单轴压缩实验和离散元数值模拟，分析层理角度对煤力学特性及其冲击破坏行为的影响。实验及数值模拟结果表明：随着层理角度增加，煤的强度、变形以及冲击破坏程度均先降低后升高；细观破裂模式逐渐由剪切主导演变为张拉主导。指出冲击地压是一个动态断裂问题，能量释放速率高于动态断裂的能量需求是动能产生的原因。据此，基于实验结果提出真实能量释放速率RERR这一新指标作为冲击倾向性判据。RERR考虑了峰后能量对冲击地压的贡献以及破坏的时间效应，反映了动态断裂阶段能量释放的剧烈程度。结合实际破坏情况(声响、弹射)和传统指标(单轴抗压强度USC、弹性能量指数WET、冲击能量指数KE和动态破坏时间DT)的评估结果，全面分析了不同层理角度煤的冲击倾向性，发现真实能量释放速率RERR与传统指标呈高度线性关系，验证了真实能量释放速率RERR的合理性和有效性。最后，建立了基于真实能量释放速率RERR的冲击倾向性等级划分标准。

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	李红儒1
	何满潮1
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	乔亚飞1
	程泰1

关键词 ：采矿工程, 冲击倾向性, 层理煤, 离散元, 真实能量释放速率, 动能

Abstract：Coal burst seriously restricts the safe mining of deep coal resources. It is important to establish reasonable coal burst proneness indicators from the perspective of inherent material properties to assess the coal burst risk. Due to the significant influence of the bedding structure on the mechanical behavior of coal，uniaxial compression experiments and discrete element numerical simulations were carried out on coal samples with different bedding angles in this study. The effect of bedding angle on the mechanical properties and burst behavior of coal was then analyzed. The experimental and numerical simulation results show that：with the increasing bedding angle，the strength，deformation，and burst feature of the coals decreased firstly and then increased; the fine-scale fracture mode gradually evolved from shear-dominated to tensile-dominated. Coal burst is a dynamic fracture issue; and the kinetic energy generates when the energy release rate is higher than the energy demand of dynamic fracture. Accordingly，a new indicator，realistic energy release rate(RERR)，was proposed as a criterion for coal burst proneness based on the experimental results. It considers the contribution of post-peak energy to coal burst and the time effect of failure，reflecting the intensity of energy release during the dynamic fracture process. By combining the actual failure situation(sound，ejection) and the comparison with the traditional indicators(including the uniaxial compressive strength USC，elastic stain energy index WET，bursting energy index KE，and duration of dynamic fracture DT)，the burst proneness of coals with different bedding angles was comprehensively assessed. The RERR was found to be highly linearly correlated with traditional indicators，the reasonableness and validity of the RERR were verified. Finally，the standard for classifying the coal burst proneness grade based on the RERR was established.

Key words： mining engineering coal burst proneness bedding coal discrete element method realistic energy release rate kinetic energy

引用本文:

李红儒1，何满潮1，2，乔亚飞1，程泰1. 层理煤的冲击破坏行为及其倾向性评价[J]. 岩石力学与工程学报, 2024, 43(9): 2178-2188.
LI Hongru1，HE Manchao1，2，QIAO Yafei1，CHENG Tai1. Burst behavior and its proneness evaluation of bedding coal#br#. , 2024, 43(9): 2178-2188.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1071 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I9/2178

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