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首页> 外文期刊>Tunnelling and underground space technology >Rockburst characteristics in syncline regions and microseismic precursors based on energy density clouds
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Rockburst characteristics in syncline regions and microseismic precursors based on energy density clouds

机译：基于能量密度云的向斜区和微震前兆的岩爆特征

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摘要

Cases of rockbursts were investigated to analyze the influence of syncline structures on rockbursts. In a syncline structure in Xing'an Coal Mine, the relationship between the activity of mining-induced tremors and a violent rockburst was studied from temporal and spatial distribution graphs of tremors and pictures of energy density clouds. The results indicated that the temporal and spatial distributions of tremors before the rockburst intuitively illustrate areas in which tremors were concentrated; however, the tremors showed more complex spatial distribution characteristics, and it was difficult to identify the evolutionary trends in tremors over time. Energy density clouds exhibited obvious nucleation characteristics, and presented an obvious extension around the nucleus until a rockburst or strong tremor happened around the edges thereof. High-stress regions formed due to the syncline structure can be identified by applying seismic velocity tomography. According to the distribution of wave velocity, large-diameter hole drilling and deep-hole blasting were implemented in targeted areas. The activity of tremors induced by the follow-up mining confirmed the effectiveness of these stress relief measures.
机译：研究了岩爆案例，分析了向斜构造对岩爆的影响。在兴安煤矿的向斜构造中，从地震的时空分布图和能量密度云图研究了采矿引起的地震活动与猛烈岩爆之间的关系。结果表明，在岩爆之前震颤的时空分布直观地说明了震颤集中的区域。然而，震颤表现出更复杂的空间分布特征，并且难以确定震颤随时间的演变趋势。能量密度云表现出明显的成核特性，并且在核周围呈现出明显的延伸，直到在其边缘周围发生岩爆或强烈震颤为止。可以通过应用地震速度层析成像来识别由于向斜构造而形成的高应力区域。根据波速分布，在目标区域进行了大口径钻孔和深孔爆破。后续采矿引起的震颤活动证实了这些缓解压力措施的有效性。

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