| 钻孔密封材料的微观特性及其对密封性能的影响 |
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| 作者姓名： | 倪冠华 林柏泉 翟成 李全贵 李贤忠 郑春山 |
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| 作者单位： | 1. 中国矿业大学安全工程学院, 徐州 221116; |
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| 基金项目： | 国家重点基础研究发展计划资助项目(2011CB201205)国家自然科学基金重点资助项目(51074161) |
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| 摘 要： | 研究了钻孔密封材料聚氨酯和膨胀水泥冻复合材料(PD复合材料)的微观特性,并考察了其对钻孔密封性能的影响作用.实验模拟了煤矿井下钻孔封孔过程,利用FEIQuantaTM250环境扫描电子显微镜对聚氨酯、PD复合材料本身,以及两者与煤壁的结合、渗透和发展进行微观对比和分析.PD复合材料的渗透系数约为聚氨酯瓦斯渗透性系数的1/48.聚氨酯为蜂窝网状结构,内部孔隙较大,与孔壁结合处存在空白区域;PD复合材料结构严实,内部孔隙极小,在孔壁处与煤体结合密实.PD复合材料比聚氨酯更容易克服钻孔周围裂隙区内瓦斯压力、水锁效应等各种阻力的作用,在钻孔周围裂隙内逐渐渗透,且其自身可以继续在钻孔周围残余裂隙和孔洞内发展.
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| 关 键 词： | 煤矿 瓦斯抽放 密封 聚氨酯 水泥 |
| 收稿时间： | 2012-10-10 |
Microscopic properties of drilling sealing materials and their influence on the sealing performance of boreholes |
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| Affiliation: | 1. School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;2. State Key Laboratory of Coal Resources and Mine Safety,Xuzhou 221116,China |
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| Abstract: | This article reports the microscopic properties of polyurethane and expansive cement jelly composite material (PD composite material) as well as their impacts on the sealing performance of boreholes. Simulated experiment of the coal mine drilling sealing process was carried out, and FEI QuantaTM 250 environmental scanning electron microscopy was used for analyzing the microstructure of polyurethane and PD composite material, together with the combination, penetration and development of these two materials with the coal wall. It is found that the permeability coefficient of PD composite material is approximately 1/48 of that of polyurethane. Polyurethane has a cellular network structure and larger internal porosity, and there exists a blank area between polyurethane and the hole wall. However, PD composite material has a smaller internal porosity, and the tight structure makes the combination of PD composite material with the hole wall more compact. Compared with polyurethane, PD composite material is easier to overcome gas pressure and water resistance and then gradually infiltrate at the fracture zone around the borehole. Moreover, PD composite material can continue to develop in residual cracks and holes around the borehole. |
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