This paper presents the results of numerical simulations carried out to confirm the influence of former mining activities on deformation of the mining terrain. The assessment of deformation changes was carried out with the use of FLAC3D program based on the finite difference method. Numerical calculations were carried out for the example of actual mining operations in seams 703/1-2 and 707/2 of “Marcel” Coal Mine. Taking into account the influence of the model’s plastic features and the so-called activation of a higher occurring seam in conducted simulations enabled obtaining a very good description of the measured subsidence. Based on the results one may state that numerical model can be used to assess the influence of former mining activities and the direction of conducted exploitation on deformations of the mining terrain. These factors are not recognized by geometric-integral theories commonly used for predicting the influence of mining operations on the surface. The results presented in this paper confirm that the applied method of simulating the phenomenon of reactivation of post-mining goafs is correct.

本文介绍了进行数值模拟的结果，以确认以前的采矿活动对采矿地形变形的影响。使用FLAC3D进行变形变化的评估基于有限差分法的程序。以“ Marcel”煤矿的703 / 1-2和707/2煤层中的实际采矿作业为例，进行了数值计算。考虑到模型塑性特征的影响以及在进行的仿真中所谓的激活较高的接缝的激活，可以对被测沉陷获得非常好的描述。根据结果​​，可以指出，可以使用数值模型来评估以前的采矿活动和进行开采的方向对采矿地形变形的影响。这些因素未被通常用于预测采矿作业对地表影响的几何积分理论所认识。