北京科技大学学报2013，Vol.35Issue(5)：572-579,8.
钻孔密封材料的微观特性及其对密封性能的影响
Microscopic properties of drilling sealing materials and their influence on the sealing performance of boreholes
摘要
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 networkz 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.关键词
煤矿/瓦斯抽放/密封/聚氨酯/水泥Key words
coal mines/ gas drainage/ sealing/ polyurethane/ cement分类
矿业与冶金引用本文复制引用
倪冠华,林柏泉,翟成,李全贵,李贤忠,郑春山..钻孔密封材料的微观特性及其对密封性能的影响[J].北京科技大学学报,2013,35(5):572-579,8.基金项目
国家自然科学基金重点资助项目(51074161) （51074161）
国家重点基础研究发展计划资助项目(2011CB201205) （2011CB201205）
