摘要
针对传统固体材料封孔易漏气、液体封孔材料易漏失的缺点,为了保障煤矿井下瓦斯抽采钻孔封孔效果,提高瓦斯抽采含量和抽采流量,根据钻孔周围煤体裂隙受采动影响动态分布的特点,打破常规瓦斯抽采钻孔封孔思路,提出了动态封孔方法,开发了能适应钻孔变形、主动渗透的柔性膏体封孔材料.该材料以粉煤灰为基料,配以保水剂、膨胀剂、纤维素和偶联剂,材料与水结合搅拌后,将形成一种柔性膏体并始终保持柔性状态.分析了材料的膨胀性能和密封性能,利用扫描电子显微镜分析了材料的微观结构.结果表明:柔性膏体材料膨胀性好,有一定的流动性,注浆方便,材料渗透性强,凝固后与钻孔孔壁结合紧密,成为一体,材料不易收缩,封孔性能优越.
In order to guarantee the gas drainage drilling and sealing effect of coal mines, aiming at the traditional shortcomings of easy air leak for solid sealing materials and easy fluid leak for fluid sealing materials, the conventional idea of sealing gas drainage drilling was broken and a dynamic sealing method was proposed according to dynamic distribution characteristics of the fracture around the borehole. The flexible gel sealing material of gas drainage borehole which adapts to drilling deformation was developed. In this study, taking fly ash as a base material, a novel composite sealing material mixed with water retaining agent, expansion admixture, cellu- lose and coupling agent was developed. Mixed with water, the flexible gel can be formed and maintain a flexible state. The sealing performance and expansion property of the material were also studied. The environmental scanning electron microscope was used to investigate the mi- crostructure of the material. The results show that the flexible gel sealing material has a desir- able expansion performance, definite fluidity and convenience for grouting. The material has strong permeability, combining closely with the drilling wall, which is not easy to shrink. Compared with polyurethane and cement grout, the flexible gel sealing material has superior sealing performance.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2013年第6期982-988,共7页
Journal of China University of Mining & Technology
基金
国家基础研究发展计划(973)项目(2011CB201205)
国家自然科学基金面上项目(51274195)
江苏省自然科学基金项目(BK2012571)
新世纪优秀人才支持计划项目(NCET-12-0959)
青蓝工程项目
关键词
瓦斯抽采
膏体封孔材料
封孔性能
渗透性
gas drainage
gel sealing material
sealing performance
permeability
