钻孔新型密封材料的微观特性  

Microscopic Characteristics of a New Type of Sealing Material for Boreholes

作　　者：张超[1,2] 李树刚[1,2] 林柏泉[3] 张天军[1,2] 林海飞[1,2] 李贤忠[3] 倪冠华[3] 

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [3]煤炭资源与安全开采国家重点实验室,江苏徐州221008

出　　处：《煤矿安全》2015年第11期17-20,共4页Safety in Coal Mines

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB201205);国家自然科学基金科学仪器基础研究专款资助项目(51327007);国家自然科学基金资助项目(51504189;51174158);西安科技大学培育基金资助项目(2014058);西安科技大学博士(后)启动金资助项目(2015QDJ035)

摘　　要：研究了聚氨酯、普通水泥、新型钻孔密封材料的微观特性。实验模拟了煤矿井下钻孔封孔过程,利用FEI QuantaTM250环境扫描电子显微镜对聚氨酯、新型密封材料在钻孔周围的微观渗透进行对比分析;利用低场核磁共振设备对普通水泥浆体和新型密封材料浆体的T2分布进行对比分析。结果表明:新型密封材料相比聚氨酯材料有着较好的渗透力,可以有效的消除钻孔封孔段周围微观裂隙和孔洞,提高封孔段的稳定性;在2 h内新型密封材料浆液的流动性较普通水泥浆液更好;普通水泥中存在溶洞孔隙,而新型密封材料中只存在微裂缝。The microscopic characteristics of a new type of sealing material,Portland cement and polyurethane for borehole are studied. Based on sealing process in the underground coal mine simulated by experiment,the permeability around boreholes of the new type of sealing material and the polyurethane material are compared through environmental scanning electron microscope FEI Quanta TM250,and T2 distribution of the new type of sealing material paste and common cement paste are analyzed by means of low field NMR equipment. The results show that the new type of sealing material has a better permeability than polyurethane material,which can effectively eliminate fractures around boreholes and improve the stability of sealing segment. Within 2 hours,due to a better liquidity feature,only micro fissures come out when the new type of sealing material is utilized while cavern porosities come out for common cement.

关 键 词：微观特性 密封性能 聚氨酯 普通水泥 新型密封材料 

分 类 号：TB302.1[一般工业技术—材料科学与工程]