Dynamic Pressure Control Technology of Presetting Pressure-relief Roadway in Coal Pillar at Fully-mechanized Caving Face of Adjacent Goaf

Based on the problem of surrounding rock deformation of roadway at fully-mechanized mining face of adjacent goaf of extra-thick coal seam at a coal mine, the basic principle of presetting pressure-relief roadway in coal pillar, the 5106 working face and roadway was analyzed by adopting the method of combining the theory analysis, three-dimensional numerical simulation and the test of practice. This paper combined the practice of the intake airflow roadway of the 5106 working-face, then the technology of dynamic pressure control of pressure-relief roadway in coal pillar was introduced, and when the pressure-relief roadway is away from the intake airflow roadway 29 m in coal pillar, and this is equivalent to narrow coal pillar of 5 m to 9 m between unloading lane and goaf, the roadway roof deformation is small, which is benefit to the safe and high-efficient mining of thin coal seam.