Thesis work carried out in the following areas:1. Study the new slurry grouting pocket reaming soil nail technology.
论文主要开展以下几个方面的工作：1。研究了浆囊袋注浆扩孔土钉新技术。
2
The large-diameter gas drainage well laid out in the Xuandong No. 2 Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.