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Energy Variation Law and Rockburst Characteristics of Coal under Cyclic Loading

机译:循环载荷下煤的能量变化法和岩爆特征

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摘要

Coal mining involves numerous challenges and safety risks owing to the complex engineering properties of coal bodies, which include discontinuities, heterogeneity, and anisotropy. In this paper, the strain energy during the coal deformation process is redivided in combination with cyclic loading and unloading tests to determine the energy evolution law and discuss the rockburst tendency characteristics. The results show that the elastic strain energy, and particularly the base-material strain energy, consistently dominates during the energy adjustment process, which is an important indicator of rockburst tendency. The elastic energy index and rebound deformation index also show that moderate plastic deformation (e.g., crack expansion and local penetration) can reduce the rockburst tendency level and prevent rockburst accidents. On the basis of the obtained results, precracking and pressure relief measures of blasting are adopted on site in advance of the working face, and good safety and economic benefits are achieved. These findings, thus, provide an important engineering reference for mines under similar conditions.
机译:煤矿涉及由于煤体的复杂工程性质,包括不连续,异质性和各向异性的若干挑战和安全风险。在本文中,煤变形过程中的应变能量与循环加载和卸载试验结合重新定义,以确定能量演化法并讨论岩骨趋势特征。结果表明,在能量调整过程中,弹性应变能,特别是基材应变能量,始终如一地占主导地位,这是岩爆倾向的重要指标。弹性能量指数和反弹变形指数还表明,适度的塑性变形(例如,裂缝膨胀和局部渗透)可以降低岩爆趋势水平并防止岩石事故。在获得的结果的基础上,在工作面前现场采用预裂和减压措施,实现了良好的安全和经济效益。因此,这些发现为类似条件下的地雷提供了重要的工程参考。

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