Unconventional staggered distance simultaneous mining theory in eztremely close and thin coal seams and its application
The exploitation of extremely close thin coal seams is featured of great interaction and it is hard to realize the simultaneous mining of upper and lower coal seams. This paper defines the extremely close coal seam and studies the unconventional staggered distance simultaneous mining in pressure-relief region formed by locating the lower coal mining face in the upper face. The mechanical model of unconventional staggered distance simultaneous mining is established and its theoretical formula is given. The numerical simulation analyzes the influence of staggered distance on the front abutment pressure distribution: when staggered distance increases, the degree of upper coal mining face front abutment stress concentration decreases and the degree of lower coal mining face front abutment stress concentration decreases first and increases later; when the staggered distance is larger than a certain value, the front abutment pressure in lower coal mining face is in double peak distribution. With theoretical analysis, the staggered distance of the left six simultaneous mining face in Zhengyang Mine is conformed to be 6 m. This research conclusion has been verified in the field and significant socio-economic benefits have been achieved, which can provide a reference for safe and efficient exploitation of extremely close coal seams.
eztremely close thin coal seams unconventional staggered distance simultaneous mining distribution of double peak values
Yuan Yong Tu Shi-hao Lu Lian-ning Ma Xiao-tao Gao Jie
Department of Mining Engineering, China University of Mining & Technology, Xuzhou 221116, China Stat Department of Mining Engineering, China University of Mining & Technology, Xuzhou 221116, China Stat
国际会议
The 6th International Conference on Mining Science & Technology ICMST 2009(第六届国际矿业科学技术大会)
徐州
英文
1-6
2009-10-18（万方平台首次上网日期，不代表论文的发表时间）