Study on the active structure of caved roof and support resistance in shallow buried and ultra-close coal seams mining

被引：0
|
作者：
Huang Q. [1 ]
He Y. [1 ]
Luo L. [1 ]
Cao J. [1 ]
机构：
[1] School of Energy,Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
来源：
| 2018年 / China University of Mining and Technology卷 / 35期
关键词：
Activated roof structure; Caved roof; Sectional coal pillar; Ultra-close coal seams;
D O I：
10.13545/j.cnki.jmse.2018.03.016
中图分类号：
学科分类号：
摘要：
Taking the ultra-close coal seams mining under the goof with 5.0~7.0 m interval distance in Huoluowan coal mine as the research object and by using the physical simulation experiments, it reveals that the first weighting step of the lower coal seam is 20 m, the periodic weighting step is 5.0~7.5 m, the weighting step is obviously reduced than in upper coal seam. In the goaf roof compaction stage, the caved roof of upper seam is activated and shows the step subsidence with "step beam" structure with strong dynamic load. The roof pressure appears periodic "high pressure zone" and "low pressure zone". The average length of high pressure zone is 16 m and the high pressure zone periodic step is 25 m. The main reason of the high pressure zone is the activation of the roof structure of the upper coal seam. The load of support under sectional coal pillar is 1.07 times of high pressure zone and is 1.48 times of the low pressure zone. Based on the theory of "step voussoir beam", the support working resistance should be more than 8 731 kN. © 2018, Editorial Board of Journal of Mining and Safety Engineering. All right reserved.
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页码：561 / 566
页数：5
相关论文
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