多层含水层工作面预注浆技术在漳村煤矿西部扩区回风立井中的应用
다층함수층공작면예주장기술재장촌매광서부확구회풍립정중적응용
Application of Pre-grouting Technology in Multilayer Aquifer Working Face to Air Returning Shaft in the West Expanding Area of Zhangcun Coal Mine