峰丛地貌浅埋煤层重复开采地表变形规律试验
Test study on surface deformation law of repeated mining in shallow coal seam of
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摘要: 为了揭示峰丛地貌下浅埋煤层重复开采诱发工作面覆岩破断运移、峰丛移动变形规律，以贵州典型峰丛地貌为工程背景，借助相似模拟、UDEC数值模拟及理论分析等手段，对工作面覆岩运动及地表移动演化规律进行研究。结果表明：随着煤层开采，山峰坡体左右两侧先后出现裂缝，随工作面的推进，裂缝逐渐缩小；重复开采对峰体左右两侧岩体结构破坏较小，而对内部岩体结构破坏较为严重；煤层开采结束后，采用UDEC模型分析峰体垂直应力以及垂直位移发展情况，发现垂直应力主要集中在峰体中央部分，垂直位移数值较大的区域同样为峰体中央部分；同时，在煤层开采结束后，相似模拟模型与UDEC模型均出现了一定程度的下沉情况，下沉量最大区域为峰丛山峰部分。Abstract: In order to reveal the law of repeated mining of shallow coal seams under the peak cluster landform, the overlying strata fracture migration and peak cluster movement deformation laws induced by the mining face, Taking Guizhou typical peak cluster landform as the engineering background, with the help of similar simulation, UDEC numerical simulation and theoretical analysis, the overlying rock movement and surface movement and evolution law of working face are studied. The results showed that with the mining of coal seams, cracks appeared on the left and right sides of the mountain slope. As the working face advances, the cracks gradually shrink. Repeated mining has less damage to the rock mass structure on the left and right sides of the peak, but more serious damage to the internal rock mass structure. After the coal seam is mined, the UDEC model is used to analyze the development of the vertical stress and vertical displacement of the peak body. It is found that the vertical stress is mainly concentrated in the central part of the peak body, and the area with larger vertical displacement value is also the central part of the peak body. At the same time, after the coal seam mining is over, both the similar simulation model and the UDEC model have a certain degree of subsidence, and the area with the largest subsidence is the peak part of the peak cluster.
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