Study on the surrounding quality control technology in the blasting excavation of coal mine rock roadway

The phenomenon of over-under-excavation is a common problem in the rapid excavation process of rock roadway.For the surrounding over-excavation phenomenon in the north return wind lane of the Nanyi district of Sijiazhuang mine, LS-DYNA is used to simulate the mechanism of the slitting drug pack, and the on-site slitting drug package comparison test is carried out.The cutting seam cartridges are filled with the left eyes and the right eyes are filled with a common medicine pack.The experiment results show that the left side blasting effect is obviously better than the right side, the smooth surface is well formed, smooth and flat, the over-digging is excavated within 50 mm, the half-eye mark is obvious, the contour of the roadway after the right side explosion is uneven, the over-under-excavation appears, with an average of 200 mm, and less residual half eye marks.The research results indicate that the slitting package can guarantee the quality of roadway forming, reduce the cycle cost and bring considerable economic benefits to the enterprise.It is suitable for wide use in rock tunneling.