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首页> 外文期刊>International Journal of Coal Geology >Earthquake-induced unusual gas emission in coalmines — A km-scale in-situ experimental investigation at Laohutai mine
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Earthquake-induced unusual gas emission in coalmines — A km-scale in-situ experimental investigation at Laohutai mine

机译：地震引起的煤矿瓦斯异常排放—老虎台煤矿的千米规模现场试验研究

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In the present study, a km-scale in-situ experiment was carried out at Laohutai coalmine in Fushun city, China, to investigate the possibility of earthquake-induced unusual methane gas emission in coalmines. The motivation of this study was attributed to the observation of a series of coalmine gas explosion accidents in China and the incidental strong earthquakes that seemed to be related to these accidents. Laohutai coalmine was chosen as the experiment base because of its high methane content in the coal body and its past and current active rockburst activities. The mechanisms of rockbursts and earthquakes are the same, i.e., both are violent failure of rock masses and geological structures due to stressing or straining. Detailed microseismic event and gas content monitoring programs were carried out at the mine site and combined with field inspection by experienced engineers, a large amount of data were collected and analyzed. It is revealed that there is a good correlation between rockburst and high methane gas emission events at the mine site. High gas emissions have been observed before, during, and after rockburst events. Therefore, an analogy can be made from the findings of this study, i.e., unusual gas emission can happen in coalmines before, during, and after an earthquake. When gas content is high and all boundary conditions are met, both rockbursts and earthquakes can trigger unusual gas emission, and sometimes the gas gushes are violent enough to fit into the category of gas outbursts. On the other hand, gas gushes can also trigger rockbursts in coalmines. This type of rockburst, which is called gas outburst rockburst, is triggered by the coupling between the unloading of the porous material and the gas storage structures and the expansion due to desorption of methane gases. A fractal relationship between seismic energy and influence radius is derived. It is suggested that methane gas emission warnings could be provided to coalmines located within the influence radius when releasing earthquake risk warnings.
机译：在本研究中，在中国抚顺市老虎台煤矿进行了千米规模的原位试验，以调查地震引起的煤矿瓦斯异常排放的可能性。本研究的动机归因于在中国观察到的一系列煤矿瓦斯爆炸事故以及与这些事故有关的偶然强地震。选择老虎台煤矿作为实验基地，是因为它在煤体中的甲烷含量很高，并且过去和现在的活跃岩爆活动均如此。岩爆和地震的机理是相同的，即都是由于应力或应变引起的岩体和地质结构的剧烈破坏。在矿区进行了详细的微震事件和瓦斯含量监测程序，并与经验丰富的工程师进行了现场检查相结合，收集并分析了大量数据。结果表明，矿山岩爆与高甲烷气体排放事件之间具有良好的相关性。在岩爆事件发生之前，之中和之后都观察到了高气体排放。因此，可以根据这项研究的结果进行类比，即在地震发生之前，之中和之后，煤矿中都会发生异常的气体排放。当瓦斯含量高且满足所有边界条件时，岩爆和地震都可能触发异常的瓦斯涌出，有时瓦斯涌出的暴力程度足以适应瓦斯突出的类别。另一方面，瓦斯涌出也会在煤矿中引发岩爆。这种类型的岩爆，称为瓦斯突出岩爆，是由多孔材料的卸载和储气结构与甲烷气体解吸引起的膨胀之间的耦合触发的。推导了地震能量与影响半径之间的分形关系。建议在释放地震危险警告时，可以向影响半径内的煤矿提供甲烷排放警告。

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