Presplitting Roof Cutting Pressure Relief and Retaining Roadway Along Goaf Technology in Fully Mechanized Mining Face
In order to improve resource recovery rate and reduce the failure rate of roadways,the technology of retaining roadway along goaf is carried out on the 3301 working face.The support scheme of"roof cutting pressure relief+reinforcement anchor cable support"is adopted,and theoretical calculations are carried out on the cutting depth,cutting angle,blasting hole charging method,failure radius and so on of presplitting boreholes.According to the different stress states in different areas of the working face during the stoping period,three stress zones are divided and targeted reinforcement support schemes are adopted.After observation and analysis,the maximum displacement amount of the roof of the retaining roadway along goaf is 144 mm,the heaving floor amount is 317 mm,and the maximum displacement amount of the two sides is 405 mm.The qualification rate of the anchor rod drawing force test reaches 81.2%.The cost of the retaining roadway along goaf after presplitting blasting is reduced by 645 yuan/m,and the effect is significant.
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