风沙滩地区中深埋厚煤层综采地表移动变形规律实测研究

    Study on surface movement and deformation law of the middle deep buried thick seam in sandy region

    • 摘要: 为研究陕北中深埋厚煤层综采地表移动变形规律,以榆神矿区三期规划区中部的小保当一号井首采工作面(112201工作面)为研究区,通过地表移动观测、GNSS地表移动自动观测和理论分析相结合等方法,研究了地表移动变形特征,获取了相关移动变形参数和采动地表裂缝发育规律。结果表明:112201工作面回采后地表最大下沉量为3 840 mm,最大下沉系数为0.66;地表移动变形持续时间约1.5 年,其中启动阶段历时18 d,活跃阶段历时110 d;活跃阶段前期的43 d是地表的集中变形期,累积地表下沉量达到地表总下沉量的91.4%;112201工作面回采诱发的地表裂缝整体发育程度弱,相对而言,切眼上方地表裂缝发育程度最强,巷道上方地表次之,面内采空区上方地表最弱;工作面内采动地表裂缝滞后回采位置发育,且裂缝宽度随回采表现出先增大后减小的“单峰”动态特征,同时动态变化特征与地表下沉速度具有耦合同步性。

       

      Abstract: In order to study the surface movement and deformation law caused by the middle deep buried thick coal seam mining in northern Shaanxi Province, the first working face (112201 working face) of Xiaobaodang Coal Mine which lies in the middle of the third phase planning area of Yushen Mining Area was taken as the research area. The surface movement and deformation characteristics, the movement deformation parameters and development laws of surface cracks caused by coal mining are obtained through the combination of observation station, GNSS observation station and theoretical analysis. The results show that: the maximum subsidence and the maximum subsidence coefficient were 3 840 mm and 0.66 respectively caused by mining of 112201 coal face. The duration of surface movement and deformation was about one and a half years. The start-up stage last 18 days, and the active stage last 110 days. Among the active stage, the surface movement and deformation are mainly concentrated in 43 days. The surface subsidence in the active stage was 91.4% of total subsidence value. The degree of development of surface crack induced by mining of 112201 coal face was weak. Relatively speaking, the development degree of surface cracks above the cut hole was greater than that above the trough, and the degree of the surface cracks above the goaf was weakest. The surface crack in the 112201 coal face was developed behind the mining position, and the width showed a “single peak” dynamic characteristic. There is coupling synchronization between the dynamic change characteristic and the velocity of surface subsidence.

       

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