The Rock Pile Quality Control During The Blasting
Research Article Shaped Charge Hydraulic Blasting An Environmental, Safe, and Economical Method of Directional Roof Cutting Quan Zhang ,1 Jiong Wang ,2 Shan Guo,2 Weili Gong,2 Longfei Feng,3 Haosen Wang,2 Can Ming,2 and Zimin Ma4 1School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China 2State Key Laboratory of Geomechanics Deep Underground.Keywords multi drilling mechanism, coal hardness, drilling depth, rotating speed, vibration characteristics, cutting loads. 1. Introduction Auger drilling machine is a new type of thin seam coal mining equipment that can realize unmanned, non supported mining, which will bring a broad application prospects in the future. At.