Research on the Technology of Retaining Roadway Along Goaf Without Coal Pillars for Blasting and Pressure Relief in Sihe Coal Mine
In view of the engineering difficulties of large mining height,fast advancement speed,and low blasting efficiency in the retaining roadway along goaf of Sihe Coal Mine,the technlolgy of retaining roadway along goaf without coal pillars for rapid blasting pressure relief is studied.A rapid charging process using energy gathering tubes as carriers and a rapid grouting hole sealing process mainly using inorganic blasting hole sealing materials,hole sealing pouches,and hole sealing equipments are designed.A mechanized pumping and filling process for concrete is designed,and on-site experiments and effectiveness inspections are conducted.The results show that the rapid charging process uses the method of producing shaped charges outside the hole and delivering them as a whole,the single hole charging time is 12 minutes,which is 30%of the traditional method,the rapid grouting hole sealing process replaces the cannon mud sealing hole,achieving mechanization of the hole sealing operation.The hole sealing time of single hole is 4-5 minutes,which is 10%of the traditional cannon mud sealing hole mode.The hole punching rate is less than 0.2%,which is much less than 5%of the cannon mud sealing hole mode,and achieving rapid directional energy gathering blasting,the concrete wall is well maintained,with a displacement amount of about 130 mm between the two sides of the retaining roadway,a subsidence amount of about 80 mm on the roof,and a bottom drum volume of about 200 mm.After 250 m behind the working face,it is basically stable.
retaining roadway along goafblasting and pressure reliefwithout coal pillarsrapid
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