To solve the problem of unstable sealing in the sealing section of a gassy, soft coal seam, a seal reinforcement material for gas extraction boreholes was developed, which was mainly made of ordinary Portland cement and blended with additives such as aluminium powder, quicklime, and gypsum. Firstly, in order to obtain the necessary expansion and compressive strength of reinforcement material, key factors affecting the material properties were determined. Key factors affecting the expansion properties and compressive strength of reinforcing materials were investigated by a single-factor test. Moreover, according to the central combination (Box–Behnken) experimental principle and response surface analysis (RSA), the interactions of various factors on the expansion and compressive strength were determined, and the optimal experimental conditions were acquired. The experimental results indicated that the optimum ratio of the material was 2% for gypsum and 0.52% for aluminium powder and quicklime at the experimental temperature of 20°C, and the ratio of water to material was 0.6. Finally, in the N1103 working face of No. 3 coal seam of Yuwu coal mine, Luan Group, China, the sealing property of the reinforcement material was validated, and the problem of hole collapse at the borehole orifice was solved (resulting in a gas concentration 2.48 times that measured before borehole reinforcement), and the gas drainage effect was enhanced.

中文翻译：

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增强密封材料的试验研究及其在煤矿中的应用

为解决瓦斯软煤层密封段密封不稳的问题，开发了一种抽气孔用密封增强材料，主要由普通硅酸盐水泥制成，并与铝粉，生石灰，石膏 首先，为了获得必要的增强材料的膨胀和抗压强度，确定了影响材料性能的关键因素。通过单因素试验研究了影响增强材料膨胀性能和抗压强度的关键因素。此外，根据中心组合（Box–Behnken）实验原理和响应面分析（RSA），确定了各种因素对膨胀和抗压强度的相互作用，并获得了最佳实验条件。实验结果表明，在20℃的实验温度下，该材料的最佳比例为石膏的2％，铝粉和生石灰的0.52％，水与材料的比例为0.6。最后，在栾城县玉雾煤矿3号煤层N1103工作面，验证了补强材料的密封性能，并解决了井口孔眼塌陷的问题（导致瓦斯浓度是井眼加固前的2.48倍），瓦斯抽采效果得到增强。水与物质之比为0.6。最后，在栾城县玉雾煤矿3号煤层N1103工作面，验证了补强材料的密封性能，并解决了井口孔眼塌陷的问题（导致瓦斯浓度是钻孔加固前的2.48倍），瓦斯抽采效果得到增强。水与物质之比为0.6。最后，在栾城县玉雾煤矿3号煤层N1103工作面，验证了补强材料的密封性能，并解决了井口孔眼塌陷的问题（导致瓦斯浓度是井眼加固前的2.48倍），瓦斯抽采效果得到增强。