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Abstract In the process of releasing goaf water in Gaohe Mine, due to the existence of unfavorable factors such as high mine pressure, development of coal seam joints and fissures, and low hardness of soft coal body, the phenomenon of little or no water coming out when drilling through the goaf often occurs. In order to ensure the safe and rapid excavation of the roadway, according to the change of roadway undulation, the water release drilling was reasonably arranged to precisely reduce the water level in the adjacent mining goaf area, and the secondary anti-collapse hole casing technology was actively used during the drilling construction to improve the water release efficiency.
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