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老采空区残留空洞空隙是老采空区地基稳定性评价、重复开采地表移动预测等的关键因素,对此进行研究具有重要的理论和实用价值。在对前苏联岩体内部实测资料分析基础上,研究了覆岩移动变形与工作面位置的关系,通过不同高度、工作面不同位置覆岩下沉差异,得到采空区空洞空隙的变化规律,结果表明:在竖直方向上,距工作面顶板越远,残留空洞空隙量越小,空洞空隙主要出现在顶板上方0.4倍开采深度的范围内;在水平方向上,距离工作面开采边界越远,残留空洞空隙量越小,空洞空隙量与采厚比和离工作面边界距离呈对数或线性分布。在假定空洞空隙随距工作面距离线性分布的基础上,给出了空洞空隙估算模型,为老采空区残余移动变形计算和重复采动分析老采空区对地表移动变形的影响提供了技术方法。
The residual void in the old goaf is the key factor to evaluate the stability of the foundation in the old goaf, and to predict the surface movement after repeated mining. It is of great theoretical and practical value to study this issue. Based on the analysis of the measured data in the former Soviet Union, the relationship between the displacement of the overburden rock and the position of the working face was studied. The variation of the void in the goaf was obtained by the difference of the subsidence of the strata at different heights and working face. It shows that in the vertical direction, the farther away from the roof of the working face, the smaller the residual void volume, the void voids mainly appear in the range of 0.4 times the mining depth above the roof; in the horizontal direction, the farther away from the working face mining boundary, The smaller the residual void volume, the void volume and thickness ratio and the distance from the face of the boundary were logarithm or linear distribution. Based on the assumption that the void space is linearly distributed with the distance from the working face, the void space estimation model is given, which provides the technical basis for calculating the residual moving deformation in the old goaf and analyzing the influence of the old goaf on the surface movement and deformation method.