Microscopic properties and sealing performance of new gas drainage drilling sealing material  

作　　者：Zhai Cheng Yu Xu Ni Guanhua Li Min Hao Zhiyong 

机构地区：[1]School of Safety Engineering, China University of Mining & Technology [2]Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》2013年第4期474-479,共6页矿业科学技术学报（英文版）

基　　金：fnancially supported by the National Natural Science Foundation of China(No.51274195);the Natural Science Foundation of Jiangsu Province(No.BK2012571);the Program for New Century Excellent Talents in University(No.NCET-12-0959);the China Postdoctoral Science Foundation(No.20090450930);the National Basic Research Program of China(No.2011CB201205);Qing Lan Project,and the Youth Foundation of China University of Mining and Technology(No.2007A003)

摘　　要：The geological condition of Chinese coal mines are complex and high gassy,which account for ffty percent to seventy percent.Because of the abundant pores and cracks around the drainage drilling hole,the gas concentration attenuates rapidly,and the effective gas drainage period is short.The traditional sealing materials of yellow mud and cement-sand grout will readily shrink after the drilling hole is sealed,the sealing length is short and the sealing quality is not satisfactory.Currently widely used polyurethane material will shrink when it comes into contact with water,and the price is also very high.In this study,taking cement as a base material,a novel composite sealing material mixed by expansion admixture,additive,and fbrin and coupling agent was developed and the sealing performance and expansion property of the material were also studied and analyzed.The FEI Quanta TM 250 environmental scanning electron microscope was used to investigate the microstructure of material.The results revealed that the new composite sealing material had a desirable expansion performance and a defnite fluidity convenient for grouting.The solidifed material,combining closely with the drilling wall,possessed an adequate strength and was not easy to shrink.Compared to the conventional polyurethane,the gas drainage concentration by drilling sealing exceeded 40 percent,and the sealing capacity improves5 times,the sealing effect increases signifcantly.The geological condition of Chinese coal mines are complex and high gassy,which account for ffty percent to seventy percent.Because of the abundant pores and cracks around the drainage drilling hole,the gas concentration attenuates rapidly,and the effective gas drainage period is short.The traditional sealing materials of yellow mud and cement-sand grout will readily shrink after the drilling hole is sealed,the sealing length is short and the sealing quality is not satisfactory.Currently widely used polyurethane material will shrink when it comes into contact with water,and the price is also very high.In this study,taking cement as a base material,a novel composite sealing material mixed by expansion admixture,additive,and fbrin and coupling agent was developed and the sealing performance and expansion property of the material were also studied and analyzed.The FEI Quanta TM 250 environmental scanning electron microscope was used to investigate the microstructure of material.The results revealed that the new composite sealing material had a desirable expansion performance and a defnite fluidity convenient for grouting.The solidifed material,combining closely with the drilling wall,possessed an adequate strength and was not easy to shrink.Compared to the conventional polyurethane,the gas drainage concentration by drilling sealing exceeded 40 percent,and the sealing capacity improves5 times,the sealing effect increases signifcantly.

关 键 词：Drilling sealing material Microcosmic structure Gas drainage Sealing performance 

分 类 号：TB42[一般工业技术]