School of Civil Engineering, Henan Polytechnic University, Jiaozuo, China.
The Project of Henan Key Laboratory of Underground Engineering and Disaster Prevention (Henan Polytechnic University), Jiaozuo, China.
PLoS One. 2023 Apr 12;18(4):e0284140. doi: 10.1371/journal.pone.0284140. eCollection 2023.
Gas drainage materials are one critical aspect of preventing coal mine gas explosions. Here, a novel dual-liquid gas sealing material was developed to improve gas extraction. The mechanical properties and hydration mechanism of the proposed material were determined. The novel dual-liquid gas sealing material's performance was verified experimentally and with field testing, with practical application explored in the YunGaiShan 2 coal mine. The results showed that the main factor responsible for gas drainage leakage was the poor sealing effect of the sealing materials on the cracks around the borehole. The novel dual-liquid gas sealing material reduced damage to the rock surrounding the borehole and significantly improved the gas drainage performance. The initial and final setting times of the novel dual-liquid material were shown to be controllable, and the slurry exhibited good fluidity, with a 28-day uniaxial compressive strength of 11.06 MPa. The analysis of the microscopic hydration mechanism showed that the production of ettringite (AFt) in the dual-liquid material increased significantly, forming a denser network interlace that functioned as a network skeleton, improving the compressive strength of the material and achieving the characteristics of plastic deformation. Field-based analysis was performed to verify the practical applicability of the proposed material, showing that the gas drainage concentration increased by 200.5% compared to the original sealing material. Moreover, the average gas drainage negative pressure increased from 7.8 kPa (using the conventional sealing technique) to 16.6 kPa using the proposed material. Overall, the proposed materials are suitable for sealing materials for effective gas drainage performance and can help control gas disasters.
瓦斯抽采材料是预防煤矿瓦斯爆炸的一个关键因素。在这里，开发了一种新型双液瓦斯封孔材料，以提高瓦斯抽采效果。确定了所提出材料的力学性能和水化机理。通过实验和现场测试验证了新型双液瓦斯封孔材料的性能，并在云盖山 2 号煤矿进行了实际应用探索。结果表明，瓦斯抽采泄漏的主要原因是封孔材料对钻孔周围裂缝的密封效果不佳。新型双液瓦斯封孔材料减少了对钻孔周围岩石的破坏，显著提高了瓦斯抽采性能。新型双液材料的初凝和终凝时间表现出可控性，浆体具有良好的流动性，28 天单轴抗压强度为 11.06MPa。微观水化机理分析表明，双液材料中钙矾石（AFt）的生成显著增加，形成了更密集的网络交织，起到网络骨架的作用，提高了材料的抗压强度，并实现了塑性变形的特点。基于现场的分析验证了所提出材料的实际适用性，表明与原始密封材料相比，瓦斯抽采浓度增加了 200.5%。此外，使用新型材料后，平均瓦斯抽采负压从 7.8kPa（使用传统密封技术）增加到 16.6kPa。总体而言，所提出的材料适用于瓦斯抽采效果良好的密封材料，可以帮助控制瓦斯灾害。
