As one of the most catastrophic dynamic hazards in underground coal mines, coal bursts have been a major safety concern around the world for many years. Although the coal bursts can occur in all cases of hard to soft coal if the right stress environment is created, the occurrence of coal bursts is closely related to the intrinsic mechanical properties of coal, such as the bursting proneness. In this study, a total of 27 coal specimens are selected in the open literature studies to obtain a group of fundament data, such as the mechanical parameters, four bursting proneness indices, stress-strain curves, and their geological conditions where the specimens were taken. The relationship between bursting proneness indices and the cohesion of the coal specimens is established by numerically fitting the stress-strain curves and theoretically deduction. By taking into account the coal heterogeneity, eight probability distribution functions are employed to assignment nonuniform cohesion to the numerical model and to study the influence of heterogeneity on bursting proneness. The results reveal that the coal cohesion, which combines the common advantages of the four proneness indices, can be used as bursting proneness index. In the research of heterogeneity, the coal bursting proneness will decrease with the increasing of cohesion scatter degree. The larger the cohesion scatter degree increase is, the lower the bursting proneness will be. The failure of coal specimen is more and more severe with the decrease of cohesion scatter degree. In addition, this paper provides two methods for assigning heterogeneous parameters to the numerical model. The contours of shear strain rate and plastic state between homogeneous and heterogeneous coal specimens are compared to study the failure types of coal specimens and to reveal the mechanism of violent failure in coal bursts.

中文翻译：

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煤体爆破倾向与力学参数关系的数值研究

煤爆作为地下煤矿中最具灾难性的动力危害之一，多年来一直是世界范围内的主要安全问题。尽管如果创造合适的应力环境，硬煤到软煤的所有情况都可能发生煤爆，但煤爆的发生与煤的内在力学特性密切相关，例如爆破倾向。本次研究在公开文献研究中，共选取27个煤样，获得一组基本数据，如力学参数、4个爆裂倾向指数、应力-应变曲线、取材地质条件等。 . 通过对应力-应变曲线进行数值拟合和理论推导，建立了爆破倾向指数与煤样内聚力之间的关系。通过考虑煤的非均质性，采用8个概率分布函数为数值模型分配非均匀内聚力，研究非均质性对爆破倾向的影响。结果表明，煤的黏聚力结合了四种倾向性指标的共同优点，可作为爆裂倾向性指标。在非均质性研究中，随着凝聚力分散度的增加，爆煤倾向会降低。凝聚力分散度增加越大，爆破倾向越低。随着内聚力分散度的降低，煤样的破坏越来越严重。此外，本文提供了两种为数值模型分配异构参数的方法。