上覆及侧向采空条件下近距离煤层沿空巷道布置研究

沿空巷道的位置布置一直是国内外研究的热点和难点,对于巷道掘进及煤炭回采期间的巷道稳定性至关重要。本文通过地质调查、数值模拟和经验分析等方法,依据南屯煤矿相邻工作面不同回采顺序,分别对侧向工作面、上覆工作面的开挖对底板及沿空巷道围岩应力分布的影响进行模拟,分析了多工作面开采动态应力的叠加演化分布规律。上覆工作面回采后,应力传播向底板及沿空巷道工作面方向发展,加剧了其应力集中程度;此外,在分析多工作面开采后应力叠加特征基础上,确定了沿空巷道的留设煤柱尺寸为6~10m,在实践中的得到了很好的验证,为类似条件下沿空巷道的布置提供了参考。

Study on Gob-side Entry Layout of Close Distance Coal Seams under Overlaying and Lateral Gob Conditions

The layout of the gob-side roadway has been a hot topic around the world for a long time, which is crucial to the roadway stability during roadway excavation and coal mining. The law of superposition of the dynamic stress distribution among the multiple working faces has been studied seriously by the simulation analysis of influence of the overlaying and lateral workface on the floor and the gob-side roadway according to mining sequence with the method of geological survey, numerical calculation empirical analysis and so on. The conclusion that the stress distribution spread to the floor and the gob-side roadway workface has been gained, which has aggravated the stress concentration. Besides, the reasonable dimension of coal pillar between 6m and 10m has been obtained on the basis of analyzing the stress superposition principle among multiple working faces, which has been proved good in practice. It is a method that provides a reference to the similar conditions.