Experimental Research on Directional Blasting in Pre-cutting Hard Coal Seam Roof

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Pan, Yangbo^1^2 ; Zuo, Yunfei^1^2 ; Zheng, Mingliang^1^2

School of Energy and Safety, Anhui University of Science and Technology, Huainan, Anhui Province

232001, China^1

Key Laboratory of Safety and High-Efficiency Mining of Ministry of Education, Huainan, Anhui Province

232001, China^2

关键词: Crack development;    Effective pressure;    Energy accumulation;    Experimental research;    Forced roof caving;    Ground pressure disaster;    Simulated experiments;    Stress wave propagation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/2/022087/pdf
DOI  :  10.1088/1755-1315/300/2/022087

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Aiming at the problem of impact ground pressure caused by the hard roof of goaf in coal mining face, the research on pre-cutting of hard coal seam roof by directional blasting was carried out. According to the principle of energy accumulation in directional blasting, a similar simulated experiment was designed on the basis of theoretical analysis of stress wave propagation law, crack development law and forced roof caving distance. The experimental results show that the roof is pre-cut by directional blasting, the integrity of the roof in front of the working face is reduced, effective pressure relief effect is obtained, the large area of overhanging roof in goaf is prevented, and the impact ground pressure disaster of the working face is relieved.