李利峰. 近距离煤层开采覆岩运移规律诱发地表沉降分析[J]. 中国矿业, 2023, 32(5): 110-117. DOI: 10.12075/j.issn.1004-4051.2023.05.002
    引用本文: 李利峰. 近距离煤层开采覆岩运移规律诱发地表沉降分析[J]. 中国矿业, 2023, 32(5): 110-117. DOI: 10.12075/j.issn.1004-4051.2023.05.002
    LI Lifeng. Analysis of overburden migration law and induced surface subsidence in close coal seam mining[J]. CHINA MINING MAGAZINE, 2023, 32(5): 110-117. DOI: 10.12075/j.issn.1004-4051.2023.05.002
    Citation: LI Lifeng. Analysis of overburden migration law and induced surface subsidence in close coal seam mining[J]. CHINA MINING MAGAZINE, 2023, 32(5): 110-117. DOI: 10.12075/j.issn.1004-4051.2023.05.002

    近距离煤层开采覆岩运移规律诱发地表沉降分析

    Analysis of overburden migration law and induced surface subsidence in close coal seam mining

    • 摘要:

      为对近距离煤层开采顶板覆岩运移规律及覆岩破坏诱发地表沉降进行分析,采用物理及数值模拟实验,以某煤矿近距离煤层开采为例进行论证。研究结果表明:开采过程中煤层上方原岩应力发生扰动,使能量得到释放,从而诱发覆岩发生持续变形现象,变形破坏的覆岩区域呈下沉抛物线状;近距离煤层开采过程中,因上方垮落覆岩作用,导致上下煤层之间的岩层发生断裂,从而引发上下采空区发生贯通现象,能量释放区形成泄压叠加区,此时对地表沉降的诱发效应最为明显和直观;上煤层开采覆岩变形破坏形态比下煤层更为直观,下煤层因上下煤层双重复合效应覆岩沉降现象比上煤层开采更为剧烈且对地表沉降诱发效应更大,数值模拟地表沉降值为3.7 m,相似模拟地表沉降值为5.6 m,理论计算地表沉降值为5.279 m,整体差值较小,可以相互验证。

       

      Abstract:

      In order to analyze the movement law of roof overburden and surface subsidence induced by overburden failure in short-distance coal mining,physical and numerical simulation experiments are adopted to demonstrate the short-distance coal mining in a coal mine.The results show that in the process of mining,the stress of the original rock above the coal seam is disturbed and the energy is released,which induces the continuous deformation of the overburden.In the process of short-distance coal mining,the strata between upper and lower coal seams are fractured due to the overlying rock action of the upper and lower coal seams,which leads to the connection phenomenon of upper and lower goaf,and the pressure relief superposition area is formed in the energy release area.At this time,the induced effect on surface subsidence is most obvious and intuitive.Coal bed mining strata on the deformation failure pattern more intuitive than lower coal,coal seam under the dual compound effect of coal strata subsidence phenomenon more intense than on coal seam mining and the surface subsidence induced effect is bigger,the numerical simulation of the surface subsidence value of 3.7 m,similar to simulate the surface subsidence value of 5.6 m,and the theoretical calaculation is 5.279 m.The overall difference is small,and can verify each other.

       

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