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采动引发地表下沉盆地边缘隆起效应研究

Study on local uplifts near border of surface subsidence basin caused by mining excavation

  • 摘要: 为了探究地表沉陷盆地边缘隆起现象及其影响因素,采用现场实测和数值模拟等方法,对不同基岩厚度、不同岩性地层进行模拟分析,研究不同采动情况及不同地质条件下地层变形特征。以煤层开采后的覆岩运移结构为基础,建立弹性基础梁力学模型,分析了地表隆起机理及其判据条件。研究结果表明,采动影响和地质条件是影响地表边缘隆起的重要因素。地表整体下沉量和下沉速度随沙基比增大而增大,随顶板岩性普氏系数增强而减小。当基岩厚度过大或覆岩岩性较软时,难以出现地表隆起现象,只有当基岩厚度和岩层普氏系数达到特定条件时,地表下沉盆地边缘方可出现隆起现象,且隆起量与基岩厚度成反比,与岩层普氏系数成正比。

     

    Abstract: To study the uplift phenomenon near the border of surface subsidence Basin and its influencing factors, field measurement and numerical simulation wer e conducted to study the uplift phenomenon near the border of surface subsidence basin under different bedrock thickness and lithology conditions.On the basis of over burden migration structures after mining excavation, a mechanical model based on the elastic foundation beam had been established to study the deformation character istics of strata in different mining and geological conditions, the mechanism of uplifts of surface and its judgment basis were also analyzed.The results showed that the most important factors affecting local uplifts near the border of surface subsidence basin were mining influence and geological condition. The amount and rate of integr al subsidence increased as the thickness of bed rock or hardness of the roof decreased.It was hard to see the uplift phenomenon as the thickness of the bedrock was to 0 large or the hardness of the roof was too high. Only when the thickness and Protodyakonov coefficient of bed rock were in a certain range, the local uplift phenomeno n could appear at the border of basin. In addition, the amount of uplift was inversely proportional to thickness of bed rock and proportional to Protodyakonov coefficient of roof strata.

     

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