采矿与安全工程学报2016，Vol.33Issue(4)：578-584,7.DOI:10.13545/j.cnki.jmse.2016.04.002
煤层厚度与层间岩性对上保护层开采效果的影响研究
Research on the upper protective coal seam mining effect induced by coal thickness and interburden rock properties
摘要
Abstract
Based on numerical simulation, a new model has been established on the effectiveness of protective mining due to the influence of the mining thickness of the upper protective coal seam, the thickness of the protected coal seam, and interburden rock strata properties. The results have shown that if the mining thickness of the upper protective coal seam increases but still is less than the occurrence thickness of the lower protected coal seam, or if the occurrence thickness of the protected coal seam in-creases but the mining thickness of the upper protective coal seam remains the same, the protective ef-fects will increase gradually. But once the mining thickness of the upper protective coal seam is larger than the occurrence thickness of the protected coal seam, the protective effect will not change basically. Furthermore, the harder the interburden rock stratum between coal seams is, the less the plastic defor-mation and stress reduction of the lower protected coal units will be, and therefore the worse the protec-tive effect will become. Finally, the stress reduction would be larger if the differences of the neighboring rock stratum are large in coal and rock mass, and both the longitudinal squeezing caused by imbalanced vertical stress and the transverse shearing caused by imbalanced horizontal stress are the important pre-cipitating factors that lead to the eccentric instability of coal and rock units under the gob and then result in the plastic deformation and failure.关键词
煤层厚度/层间岩性/上保护煤层开采/应力变化与塑性影响/数值分析Key words
coal thickness/interburden rock properties/upper protective mining/changes of geostress and effects of plasticity/numerical analysis分类
矿业与冶金引用本文复制引用
陈彦龙,吴豪帅,张明伟,吴宇,张后全,张桂民..煤层厚度与层间岩性对上保护层开采效果的影响研究[J].采矿与安全工程学报,2016,33(4):578-584,7.基金项目
国家自然科学基金项目(51404262，51504237，51504243)；江苏省自然科学基金项目（BK20140213，BK20150191）；中央高校基本科研业务费专项资金项目(2015QNA60) （51404262，51504237，51504243）
