深埋薄基岩厚煤层充填开采的地表沉陷控制研究

Study on the Influence Law of Filling Mining on Surface Subsidence at Deep−buried and Thin Bedrock Thick Coal Seam

  • 摘要: 深埋薄基岩厚煤层开采加剧地表沉陷,威胁建筑物安全、破坏耕地,在煤粮共产基地还会引发煤炭开采与粮食安全的矛盾。为厘清该地质条件下地表沉陷特征,提出科学的控制方法,为类似矿区沉陷防控提供理论与实践参考,助力煤炭绿色科学开采,以焦作矿区赵固二矿为工程背景,调研了地表环境受损特征,提出源头控制思路。采用UDEC数值模拟软件,设置0.6~0.9四种充填率,结合岩层运动4个阶段,探究充填率对各阶段地表沉陷的影响,分析覆岩位移、下沉系数等关键参数。研究结果表明:充填开采可有效控制地表沉陷,效果随充填率提升而增强,各阶段差异显著:充填率0.9时,薄基岩、冲积层冒落拱、冲积层压实、覆岩整体下沉阶段下沉系数分别降低39.1%、68.6%、88.2%、86.6%,其中冲积层压实阶段控制效果最佳。下沉系数与充填率的相关性随阶段变化,充填率≥0.8时控制效果显著提升。源头控制思路可增强岩层对地表变形的控制能力;充填开采是有效控制方法,充填率与沉陷量、沉陷范围呈负相关,冲积层压实阶段为控制关键。研究成果可为沉陷预测及充填方案设计提供支撑。

     

    Abstract: Surface subsidence can seriously affect the deformation of surface buildings and surface cultivated land. Mining under conditions of thick alluvial layers and thin bedrock will intensify the degree of surface deformation. To effectively control surface deformation, conducting research on the principles and methods of surface subsidence control was crucial for ensuring the safety of surface structures. This paper took the Zhaogu No.2 coal mine in Jiaozuo mining area as the engineering background, investigated the characteristics of surface environmental damage, and proposed a surface subsidence control idea based on the source. By controlling the overburden rock layer from breaking or not completely breaking, the control ability of the rock layer over surface deformation can be effectively enhanced. The surface subsidence influence characteristics of the movement of four rock strata under the mining of thick coal seams with deeply buried thin bedrock under different filling rates were explored. The results show that filling mining can effectively control the amount and range of surface subsidence. During the compaction stage of alluvial layers, the filling rate has the best control effect on surface subsidence. The research results can provide a reference for the control of surface subsidence under similar geological conditions.

     

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