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受层间扰动影响,多煤层开采垂直应力分布复杂。以有限元软件FLAC为基础,利用数值模拟方法,结合理论分析,研究了煤层间距、垮落角和岩层横观各向同性对多煤层开采下覆岩层垂直应力重新分布的影响。结果表明:煤层相距越近,垮落角越小,层间扰动越明显,煤柱下方岩层垂直应力集中现象越严重;横观各向同性增强了岩层传递力的特性,改变了垂直应力曲线形状。
Affected by interlayer disturbances, the vertical stress distribution in multi-seam mining is complex. Based on the finite element software FLAC, numerical simulation and theoretical analysis were conducted to study the effects of coal seam spacing, collapse angle and transverse isotropy of rock strata on vertical stress redistribution in overburden strata under multiple coal seam mining. The results show that the closer the coal seam is to the coal seam, the smaller the caving angle and the more obvious inter-layer perturbation are, the more serious the vertical stress concentration is. The transverse isotropy enhances the characteristics of the rock transfer force and changes the shape of the vertical stress curve .