Roof stability analysis in No.3 coal seam of Panxie peripheral
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摘要: 针对现有顶板稳定性评价方法存在准确性较差、可操作性不强等问题，提出将可拓学理论应用于煤层顶板稳定性分析中。针对潘谢外围3煤层顶板稳定性问题，以断裂分维值、硬岩比例系数、直接顶强度系数、统计厚度内岩层层数为评价指标，综合四分法和数理统计分析确定各评价指标的分级标准，结合灰色关联度法和可拓学物元模型对顶板稳定性做出了评价。评价结果表明，潘谢外围稳定区占较大面积，中等稳定区零星分布，不稳定区和极不稳定区分布于外围中部、F66断层和岩浆岩侵入区附近；南部顶板总体稳定性较好，北部和南部局部地区顶板稳定性较差，主要与岩浆侵蚀有关；自西北向东南，F66断层对附近煤层顶板稳定性影响逐渐减小。Abstract: In view of problems of poor accuracy and weak maneuverability existed in roof stability evaluation methods, the extension theory was applied to stability analysis of coal seam roof. For problem of roof stability of No.3 coal seam of Panxie peripheral, fault fractal value, hard-rock ratio, strength coefficient of immediate roof and number of layers in the statistical thickness were used as evaluation factors. And classification standard of each factor was determined by quartering and mathematical statistics analysis. Finally, the grey relation method and the extension matter-element model were used to evaluate roof stability. The evaluation results show that stable region has a large area in Panxie peripheral, mid-stable zone is scattered, unstable and extreme unstable areas are located in the central of peripheral and the vicinity of F66 fault and magmatic intrusive area; the overall roof stability in the south is better, while roof stability in the northern and southern parts is poor, which mainly related to magmatic erosion; from northwest to southeast, the influence of F66 fault on roof stability of nearby coal seam decreases gradually.
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