In this paper, considering for the first time the case of multi-seam mining, which means a working face with old goafs in the upper layer, a parameters computation method of subcritical underground ...

The spatial location information of tunnels, goafs, cavities, subsidence areas, and pipe corridors in the space. In this paper, through experimental detection and analysis of the theoretically ...

Mineralogy is the study of minerals, the building blocks of rocks, which are naturally-occurring, crystalline solids with a set chemical make-up. This includes the study of the chemical ...

School of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo ...

§ ‡ Department of Chemistry, Tri-Chandra Multiple Campus, and § Department of Engineering Science and Humanities, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Kathmandu, Nepal ∥ ...

China Coal Science and Technology Ecological Environment Technology Co. Ltd., China coal technology and engineering group, Beijing, China Herein, this paper reviews the development of digital drilling ...