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Effect of bedding structural diversity of coal on permeability evolution and gas disasters control with coal mining

机译：煤层理结构多样性对煤层渗透率演化及瓦斯灾害防治的影响

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Bedding structure has affected gas flow in coal seam greatly, which also controls gas permeation direction and gas extraction results, and finally it has tremendous influence on prevention and control of gas disaster accidents. Combined with engineering practice of gas disaster prevention and control in China, in this paper, permeability evolution of nature coal in different bedding directions in the condition of loading is studied, and the results showed that in three directions of bedding fractures, permeability of coal which is parallel to bedding planes is the highest; it would be much easier for gas percolation along the bedding planes than other directions. In the unloading process, tension-shear destruction appears in coal sample which is oblique to bedding along the bedding planes, with a sudden increase in permeability. It is difficult for the crack damage from loading process to recover in unloading process, that is, permeability of unloading isn't just a simple reverse process of loading. Combined with the permeability evolution of the three coal samples in the whole process, three permeability evolution models which include elasticity, plasticity and fracture are proposed. Based on the experimental results, gas extraction using boreholes along coal seam and through coal seam is compared during depressurized mining. Due to the bedding structure of coal seam, a large area of fracture network of "boreholes-bedding fractures" is formed among boreholes through coal seam and bedding structure, which makes the good effect of gas extraction using boreholes through coal seam. Research results will be of important guiding significance for choosing the best gas extraction scheme, layout of setting parameters of drilling boreholes and gas disaster prevention in the underground coal mine
机译：层状结构极大地影响了煤层的瓦斯流动，还控制了瓦斯的渗透方向和瓦斯抽采效果，最终对瓦斯灾害的预防和控制产生了巨大的影响。结合我国瓦斯灾害防治的工程实践，研究了在加载条件下天然煤在不同层理方向上的渗透性演化，研究结果表明，在层理裂缝的三个方向上，煤的渗透性主要体现为平行于寝具平面最高;沿着层理平面进行的气体渗透比其他方向容易得多。在卸料过程中，煤样中出现了拉伸剪切破坏现象，它沿层理平面倾斜于层理，渗透率突然增加。加载过程中的裂纹损伤很难在卸载过程中恢复，也就是说，卸载的渗透性不仅仅是简单的加载反向过程。结合三个煤样全过程的渗透率演化，提出了弹性，可塑性和断裂三种渗透率演化模型。根据实验结果，在减压开采过程中，比较了沿煤层和沿煤层钻孔的瓦斯抽采。由于煤层的层理结构，穿过煤层的井眼和层理结构之间形成了大面积的“井眼-层状裂缝”裂缝网络，这使得通过煤层的井眼具有良好的瓦斯抽采效果。研究结果对于选择最佳瓦斯抽采方案，井眼设置参数的布局以及地下煤矿瓦斯灾害的预防具有重要的指导意义。

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