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利用弹性薄板理论和关键层理论,对采空区上覆岩层的下沉进行定量描述,研究采动影响下覆岩裂隙的分布特征,得到了基于相对下沉量的覆岩规则移动带空隙率的近似公式。研究表明,覆岩裂隙场内,裂隙数量分布以两边为多,中部较少,在关键层下部的岩层往往产生较大的离层空间;随着岩层深度减小,空隙率逐渐变小,覆岩底部,空隙率曲线沿走向呈现马鞍状,在关键层或者硬岩起作用的区域形态发生改变,曲线形态逐渐变成拱状。其结论可应用于岩体渗流研究及瓦斯综合治理。
The elastic sheet theory and key layer theory are used to quantitatively describe the subsidence of the overlying strata in the goaf. The distribution characteristics of the strata in the overlying strata under the influence of mining are studied. The porosity of the strata is obtained based on the relative subsidence The approximate formula. The results show that in the overburden rock fracture zone, the distribution of fractures is more on both sides and less in the middle part, and the strata in the lower part of the key layer tend to have larger delamination space. As the depth of the rock formation decreases, the porosity decreases At the bottom of the rock, the porosity curve presents a saddle shape along the strike, changing the shape of the region where the key layer or hard rock works, and the curve shape gradually becomes an arch shape. The conclusion can be applied to the study of rock flow seepage and gas comprehensive treatment.