韩咀煤矿32101工作面采动地裂缝走向与黄土地貌关系探讨
Discussion on the relationship between mining⁃induced ground fractures strike and loess landform at 32101 face of Hanzui coal mine
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摘要: 黄土覆盖浅埋采煤山区生态保护与可持续发展的前提,是寻找采动地表破坏规律,进而有 的放矢,提出针对性的区划、保护和防治措施。 以韩咀煤矿 32101 工作面采动地表裂缝走向分布为 研究对象,通过无人机拍摄、地表裂缝填图、分区统计,得到不同地貌部位地表裂缝的走向规律,进 而探寻采动地裂缝与黄土地貌的关系,获得如下认识:1 采动地裂缝分为 3 种类型,即采动+构造 节理引起的地裂缝、采动+地貌因素引起的地裂缝、采动+地形因素引起的地裂缝;采动+构造节理 引起的地裂缝主要分布在黄土墚顶,裂缝走向与黄土墚走向及区域水系末梢沟谷走向一致;采动+ 地貌因素引起的地裂缝主要分布在黄土斜坡上,裂缝走向沿着斜坡等高线方向;采动+地形因素引 起的地裂缝亦主要分布在黄土斜坡上,裂缝走向垂直坡体等高线方向。 地裂缝主要分布在坡度 0°~20°内,在沟谷底部不发育;2 沟谷侧畔斜坡是遭受侵蚀和破坏的优势部位,也是采动地裂缝发 育的优势部位;3 在煤层埋深、采厚、采煤方法等因素一致的情况下,采动影响带范围由黄土下伏 基岩古地貌面高程决定,与新黄土的覆盖厚度无关。 井工开采导致的地表裂缝,是黄土覆盖山区滑 坡、崩塌、串珠状落水洞形成的重要诱因,加速了地貌演化的进程。Abstract: It is the premise of ecological protection and sustainable development in shallow coal mining area covered by loess that finding the law of ground damage caused by mining,and then putting forward some targeted zoning,protec⁃ tion and prevention measures. Taking the constant of mining⁃induced fracture strike as the focus,the surface fracture information is obtained through taking photos from drone and mapping ground fractures. The trend of surface fractures at different landform positions is obtained through zonal statistics. Thus, the relationship between mining⁃induced ground fractures and loess landform at the 32101 working face of Hanzui coal mine is explored. The conclusions are as follow 1 mining⁃induced ground fractures are divided into three types including mining and structural fractures,mining and landform fractures,and mining and terrain fractures. Mining and structural fractures are main⁃ ly distributed in the loess ridge,and the strike of the fractures is consistent with that of the loess ridge and the end of the regional drainage system. Mining and landscape fractures can be seen on the loess slope and the strike of frac⁃ tures along the direction of the slope contour. The main distribution of mining and terrain fractures is also on the loess slope,and the strike of fractures is perpendicular with the direction of slope contour. Mining⁃induced ground fractures are mainly distributed in the slope ranging from 0°-20° and do not develop at the bottom of the gully.2 The slope be⁃ side the gully is the dominant position to suffer erosion and destruction,and it is also the dominant position of mining⁃ induced ground fractures.3 The range of mining influence zone is not related to the thickness of covered loess and the surface landform and it is influenced by the underlying bedrock paleogeomorphic surface,the depth of coal seam,min⁃ ing thickness,and mining method,etc. The mining⁃induced ground fractures triggers the formation of the landslide,col⁃ lapse and beaded waterfall holes in the loess covered area,which accelerate the process of geomorphic evolution.