中国矿山工程

The gob-side entry retaining technology is adopted for the 125220 belt conveyor entry of a coal mine in Shanxi Province, in order to study the engineering application of the technology, the entry surrounding rock is sampled to carry out a measuring test of mechanical parameters, followed by a FLAC3D based numerical simulation study by different cutting depths and angles. Finally, it is determined that the optimal cutting depth is 10m, the cutting angle is 10°, the spacing of cutting holes is 0.6m, the hole depth is 10m, the charging depth is 5m, the hole sealing is 3m, and a group of 10 holes is blasted at the same time. During the advance of stopping, the maximum displacement of the entry roof in the deep part is 176mm and in the shallow part is 78mm. The single hydraulic support used in the entry retaining section produces stress fluctuation, with the maximum value of 42MPa. The support measures are safe and reliable.