煤柱下近距离煤层回采巷道合理位置研究

Study on Reasonable Location of Mining Roadway in Close Distance Coal Seam under Coal Pillar

针对回坡底矿井11号煤层开采时易受到近距离10号煤层回采影响的开采实践,文章以回坡底矿10号、11号煤层近距离煤层群为工程背景,通过理论分析、数值模拟对上下煤层巷道不同布置形式进行了分析,分析表明:煤柱下底板应力影响范围随深度增加而加大,剧烈程度随深度增加而降低;当11号煤工作面巷道与10号煤巷道重叠布置时,上下煤层煤柱均保持有较大核柱区,且巷道集中应力较小,能够保证下煤层工作面的正常安全回采。研究结果为回坡底矿井近距离煤层群下层煤开采巷道布置提供了理论依据。

Aiming at the mining practice that the 11# coal seam in the Huipodi mine is easily influenced by the mining of the 10# coal seam with close distance, this paper takes the coal seam group of 10# and 11# seam in the Huipodi mine as the engineering background. Through theoretical analysis and numerical simulation, the analysis of the different layout forms of upper and lower coal seam roadway shows that the influence range of stress on the lower floor of coal pillar increases with the depth and the severity decreases. When11# coal face and 10# roadway overlap each other, the upper and lower coal seam pillars have maintained a larger stability zone, and the roadway concentrated stress is small, and it can ensure the normal safe mining in lower seam. The results provide a theoretical basis for the roadway layout of coal mining under the coal seam group in the Huipodi mine.