Research on New Borehole Sealing Material and Sealing Technique Applied to Mine Gas Drainage

In order to solve the poor borehole sealing quality,low gas drainage negative pressure,poor gas drainage effect and other problems of the gas drainage b orehole in Shanmushu Mine,a new mine borehole sealing material PD and borehole sealing technique was applied.The microencapsulation technology was applied to th e material PD.Thus the grout of the material would be steadily swollen during the slow solidification process and would be permeated into the micro cracks around the b orehole.Therefore the sealing of the cracks around the borehole could be formed.During the application process of the material,Pengbo borehole sealing material as the secondary material was applied as the grouting plug,and there would be a two sealing and one grouting sealing technique formed with a grouting between two sealing e nds.The applied results showed that in comparison with the conventional borehole sealing technique,the average gas volume fraction of the gas drainage borehole was improved from 22.6% to 36.8% , the average gas drainage negative pressure was improved from 2.8 kPa to 9.1 kPa and the average net gas flow value of a gas borehol e was improved from 9.42 L/min to 44. 53 L/min.