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为深入研究深部近距离煤层上行开采过程中岩层应力分布、断裂破坏及下沉变形特征,根据深部煤层开采的具体工程地质条件,建立了深部近距离煤层上行开采相似材料试验模型,对上行开采中围岩应力变化、覆岩运动及裂隙演化过程进行了模拟分析。获得了下煤层和上煤层开采过程中,围岩应力分布变化特点及分区特征、岩层裂隙富集区主要分布区域及其演化规律,煤层开采过程中切眼和煤壁附近岩层断裂角的变化特征,并得到了两煤层工作面相对位置不同情况下,岩层裂隙富集区演化特点、断裂角变化及下沉变形规律。研究成果为类似条件下煤层上行开采、瓦斯抽采提供参考。
In order to further study the stress distribution, fracture failure and deformation characteristics of rock strata during deep mining, the paper sets up a test model of similar material for deep mining near coal seam according to the specific engineering geological conditions of deep coal seam mining. Rock stress changes, overlying strata movement and fissure evolution process were simulated. The characteristics of the stress distribution and the characteristics of zonal distribution of the surrounding rock are obtained during the mining process of the lower coal seam and the upper coal seam. The main distribution areas and evolutions of the rock fracture enrichment zone are obtained. The change characteristics of the fracture angle of the rock cut near the coal wall during cutting and mining , And the evolution characteristics, fracture angle variation and subsidence deformation law of the rock fissure enrichment zone under the different relative positions of the two coal faces are obtained. The research results provide a reference for the coalbed mining and gas drainage under similar conditions.