Application of Virtual Rotation Center Technology in Fan-shaped Surface Adjustment of Irregular Fully Mechanized Mining Face

Aiming at the difficult problem of low stoping efficiency in irregular fully mechanized mining faces under complex conditions, a systematic analysis is conducted on the practical application of virtual rotation center fan-shaped surface adjustment technology in the 27316 working face of Wanglou Coal Mine. By optimizing the positioning of the rotation center, the collaborative propulsion strategy of the support group, and the dynamic matching mechanism of the roof support strength, the contradiction between mining and support under complex working conditions is solved. The on-site actual measurement data indicates that after surface adjustment, the stoping efficiency of the working face is improved by 15%, the support propulsion rate and support strength are improved by 25% and 20% respectively, and the roof failure rate and support instability rate are significantly decreased; The resource recovery rate is improved by 5.5%, and the unit mining cost is decreased by 8.3%. The research verifies the adaptability and effectiveness of the virtual rotation center surface adjustment technology in irregular fully mechanized mining faces, provides a replicable technical scheme and practical references for efficient and safe mining of coal mines under similar complex conditions.