Xue Sheng, Zhang Lei, Zheng Xiaoliang, Liu Shilong, Gao Chuanyin
State Key Laboratory for Safe Mining of Deep Coal and Environment Protection, Anhui University of Science and Technology, Huainan 232001, China.
Joint National-Local Engineering Research Center for Safety and Precise Coal Mining, Anhui University of Science and Technology, Huainan 232001, China.
ACS Omega. 2025 Jun 25;10(26):28343-28350. doi: 10.1021/acsomega.5c02991. eCollection 2025 Jul 8.
There are numerous constraints in conducting on-site experiments on the characteristics of gas emissions from boreholes in underground coal mines. Hence, it holds great significance to carry out experimental studies on gas emissions from boreholes in the laboratory. However, some of the conditions of the previous experimental systems employed differ from those in the field; especially, the drill bit used in actual coal mining borehole drilling and the diameter of the drilled hole are not unified, and the size of the borehole and drill bit affect the gas emission characteristics. In response to the above circumstances, this paper proposed and developed a physical simulation experimental system for a coal borehole drilling experimental system; the borehole and drill bit size were close to the actual engineering situation. The coal seam gas pressure was chosen, which directly influences the risk index of coal and gas outburst; experiments on the characteristics of gas emission from boreholes under different adsorption pressure conditions were conducted. The results indicated that the gas emission volume from the borehole increased with the increase of adsorption equilibrium pressure. The initial gas emission model conformed to the exponential decay model. The gas emission velocity initially rose and then remained stable. Under conditions of higher adsorption pressure, it took longer for the borehole gas emission velocity to reach stability. The developed experimental system provides technical conditions for the follow-up laboratory study of gas emission in coal cutting borehole drilling. The research results provide technical conditions for follow-up studies on gas emission in coal cutting boreholes and a basis for further development of the characteristics of gas emission in briquette boreholes.
在地下煤矿进行钻孔瓦斯排放特性的现场实验存在诸多限制。因此，在实验室开展钻孔瓦斯排放实验研究具有重要意义。然而，以往所采用的实验系统的一些条件与现场情况不同；特别是，实际煤矿钻孔钻进中使用的钻头和钻孔直径不统一，钻孔和钻头的尺寸会影响瓦斯排放特性。针对上述情况，本文提出并研制了一种用于煤钻孔钻进实验系统的物理模拟实验系统；钻孔和钻头尺寸接近实际工程情况。选取了直接影响煤与瓦斯突出风险指标的煤层瓦斯压力；进行了不同吸附压力条件下钻孔瓦斯排放特性实验。结果表明，钻孔瓦斯排放量随吸附平衡压力的增加而增大。初始瓦斯排放模型符合指数衰减模型。瓦斯排放速度起初上升然后保持稳定。在较高吸附压力条件下，钻孔瓦斯排放速度达到稳定所需时间更长。所研制的实验系统为后续煤巷钻孔瓦斯排放实验室研究提供了技术条件。研究结果为煤巷钻孔瓦斯排放后续研究提供了技术条件，也为进一步开展煤粒钻孔瓦斯排放特性研究奠定了基础。
