Research on Advanced Hydraulic Fracturing with Long Horizontal Hole for Governing Roadway Roof Technology
Aiming at the problems of strong mine pressure behavior,a large range of advanced influence on the roadway,severe mine pressure,and difficulty in maintenance during the stoping process of the extra thick coal seam working face,taking the 2311 roadway of the 8311 working face of Tongxin Coal Mine as the engineering research background,the principle of long hole hydraulic fracturing is adopted,and a long hole hydraulic fracturing scheme is formulated by optimizing the hydraulic fracturing parameters.The results show that after adopting the long horizontal hole hydraulic fracturing measure,the strength and range of advanced mining pressure are significantly reduced,the resistance of the support at the working face of the 0-20#support is reduced,and the suspended roof can collapse in a timely manner.The stress environment of the roadway surrounding rock is improved,the level of stress transmission from the roof rock strata of the goaf on both sides to the end of the working face roadway is effectively reduced,and the deformation of the roadway surrounding rock is reduced by more than 60%,the roadway stress structures at the end of the working face and in front of the stoping are improved,the strength of incoming pressure is obviously weakened,and the purpose of regulating the stress level of the roadway is achieved,thereby achieving safe and efficient stoping of the working face.
long horizontal holehydraulic fracturepressure reliefsurrounding rock stresssuspended platesmall coal pillar
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