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保护层开采及被保护层卸压瓦斯抽采技术是防治煤与瓦斯突出最有效、最经济的区域性措施之一.通过分析保护层开采的机理和保护效果的影响因素,在反映保护层厚度与层间垂距的相对层间距基础上,综合考虑煤层赋存条件、回采参数以及层间硬岩的影响,构建了以当量相对层间距为指标的保护层分类判定法,将下保护层分为近距离、远距离和超远距离3类,上保护层分为近距离和远距离2类.通过以天府磨心坡矿急倾斜上保护层开采和阳泉新景矿近水平下保护层开采的应用,并与现场试验结果的对比表明,提出的保护层判定方法是正确和可行的,能准确地对保护层的类型做出判定.
Protection layer mining and protected layer relief gas drainage technology is one of the most effective and economical regional measures to prevent and control coal and gas outburst.By analyzing the mechanism of protective layer mining and the influencing factors of the protective effect, Based on the relative layer spacing between layers and the relative interlacing distance between layers, considering the occurrence conditions of coal seam, the parameters of mining and the influence of interlayer hard rock, the classification method of protective layer based on equivalent relative layer spacing is established. For the three kinds of short distance, long distance and long distance, the upper protective layer is divided into two types of short distance and long distance.Through the Tianfu Moxibao mine steep slope protective layer mining and Yangquan Xinjing mine under the level of protective layer mining The comparison with the field test results shows that the proposed method for determining the protective layer is correct and feasible and can accurately determine the type of the protective layer.