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Mechanism of water inhibiting gas outburst and the field experiment of coal seam infusion promoted by blasting

机译：爆破促进煤层注水的抑水机理及现场试验

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摘要

Gas outburst is a serious disaster in deep mining. In this paper, we first study the effect of water content on gas outburst, and found that increasing the water content of coal can significantly reduce the elastic modulus and uniaxial compressive strength, which is beneficial in reducing the peak stress concentration in the roadway and pushing the peak stress deeper. We also found that by increasing the water content of the coal seam, the firmness coefficient increases, while the initial speed of gas diffusion decreases simultaneously. Increasing the water content of the coal seam can also change the Langmuir adsorption constant of coal, reduce the a value of the limit adsorption capacity, increase the b value of the adsorption capacity, and reduce the amount of desorption gas in the coal. These studies indicate that increasing the water content of coal can significantly reduce the risk of gas outbursts.To increase the water injection volume, the technology of promoting coal seam infusion by blasting has been proposed. Blasting promotes equilibrium distribution in the stress field and generate new fractures, which promotes the water injection. In the 8th coal mine in the Pingdingshan coal field, the test results indicate that after loosening blasting, the water injection of a single borehole increased by an average of 54.6 times under the injection pressure of 3-7 MPa. The water content of coal is improved significantly, and the prediction index value of the gas outburst is reduced significantly. This technology is important for gas control in similar coal mines.
机译：瓦斯突出是深部采矿的严重灾难。在本文中，我们首先研究了含水量对瓦斯突出的影响，发现增加煤的含水量会显着降低弹性模量和单轴抗压强度，这有利于降低巷道中的峰值应力集中和推动力。峰值应力更深。我们还发现，通过增加煤层的含水量，固结系数增加，而瓦斯扩散的初始速度同时降低。增加煤层的含水量还可以改变煤的朗缪尔吸附常数，降低极限吸附容量的a值，增加吸附容量的b值，并减少煤中的解吸气体量。这些研究表明，增加煤中的水分含量可以显着降低瓦斯突出的风险。为了增加注水量，提出了通过爆破促进煤层注水的技术。爆破促进了应力场中的平衡分布并产生了新的裂缝，从而促进了注水。在平顶山煤田八号煤矿，试验结果表明，在松动爆破后，在3〜7 MPa的注入压力下，单个钻孔的注水量平均增加了54.6倍。煤的含水量显着提高，瓦斯突出的预测指标值明显降低。这项技术对于类似煤矿的瓦斯控制非常重要。

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