Research on exploiting residual coal around final end-walls by highwall mining system in China
Research on exploiting residual coal around final end-walls by highwall mining system in China
复制标题
DOI：
10.1080/17480930.2012.678768
复制
发表时间：
2013-06-01
影响因子：
2.4
通讯作者：
Matsui, Kikuo
中科院分区：
文献类型：
--
作者：
Chen, Yanlong;Shimada, Hideki;Matsui, Kikuo
为提高露天煤矿的资源回收率和经济效益，提出了一种适合我国国情的端帮残煤高壁开采技术。基于MarkBieniawski公式和支流面积理论，给出了厚覆盖层下高帮开采参数的评价方法。并在此基础上，提出了厚覆盖层条件下高帮开采的煤柱设计图。为了检验所提出的方法的支柱设计的合理性，还进行了数值模拟。结果表明，随着覆盖层厚度的增加，所需煤柱宽度增大，采收率相应降低。为了提高煤炭回收率，应考虑厚盖层下的充填技术。二维数值模拟结果表明，本文提出的厚覆盖层条件下高帮开采矿柱稳定性计算方法是可行的。研究还发现，保持煤柱宽高比大于1是厚覆盖层下保持煤柱稳定和完整的关键措施。同时得出结论：在保护层厚度较大、应力比较高的情况下，开孔顶板的安全系数要求较大。因此，在我国露天煤矿开采端帮残煤时，采用高帮开采是可行的。这样，不仅可以提高煤炭回收率，而且可以延长我国露天煤矿的生产寿命。
To improve the resources' recovery ratio and the economic benefits of surface coal mines, we present a residual coal extraction technology from final end-walls with highwall mining system in China. Based on MarkBieniawski formula and tributary area theory, the evaluation methodology of highwall mining parameters under the thick cover was given. Furthermore, the pillar design chart in the highwall mining system under the thick cover was also concluded. In order to examine the rationality of the pillar design with the presented methodology, numerical simulation was also carried out. The outcome shows that it will require a larger pillar width with the thickening of the cover; hence, the recovery ratio will decrease correspondingly. To improve coal recovery ratio, the backfilling technology should be considered under the thick cover. According to two-dimension numerical simulation results, the calculated methodology for pillar stability of highwall mining system under the thick cover presented in this article is acceptable. It also found that keeping the pillar width-to-height ratio above 1 is a key measure to maintain the pillar stable and integral under the thick cover. Meanwhile, it can be concluded that the bigger safety factor is demanded for roof of openings under much thicker cover and higher stress ratio. In other words, the highwall mining system is feasible to extract the residual coal around end-walls in Chinese surface coal mines. Thus, not only coal recovery ratio can be improved but also can increase the production life of surface coal mines in China.