浅埋缓斜煤层回采巷道合理煤柱宽度设计

Design of rational width of coal pillars in gateways in gently inclined shallow coal seams

探讨了煤柱的受力情况及煤柱的极限承载能力,通过极限平衡理论塑性区计算模型得出最小煤柱宽度,并用数值模拟分析了尺寸效应对煤柱塑性区宽度、应力分布及巷道变形的影响。

This paper iscusses the pressure from the roof strata onto the coal pillars and the latter＇s extreme load bearing capacity. Minimum width of the coal pillars in question is obtained by using the calculating model for plastic deformation area based on the theory of limiting equilibrium. Also, numerical simulation is used for the analysis of the impact of scale effect on the width of the plastic deformation areas of the coal pillars, stress distribution of the coal pillars and the gateway deformations.