The characteristics of the movement of dynamic strata in combined open-pit and underground mining based on similar material simulation experiments were studied in this study. To get more accurate test parameters, a similar material, based on a sheet of brittle material, was developed. We then used the Anjialing coal mine as our case study sample. The characteristics for movement of dynamic strata and development of bed-separated fissure in working faces including 24,207, 24,208, and 29,210 were investigated by experimental simulation and numerical simulation, which was based on a similar simulation test system and Fast Lagrangian Analysis of Continua 3D (FLAC^3D) statistical analysis software. Results from the experimental simulation demonstrated that the movement of dynamic strata during the mining process could be expressed as follows: underground mining → submerged rock → “arch-shaped” rock → “pit-type” subsidence region → perforation of slope fractures. When the working face 29,210 was advanced to the mining stop line, the overlying rock strata generally slid towards the slope with less separation cracking in the vertical direction. With the continuous advancement of working face 29,210 , the slope stress increased significantly and formed a slip surface or potential slip surface in the sloping rock. Moreover, the numerical analysis, similar material simulation experiment, and actual mining results were all similar, indicating that a similar material simulation experiment based on a sheet of brittle material well reflected the characteristics for the movement of dynamic strata in combined open-pit and underground mining.

中文翻译：

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基于相似材料模拟实验的露天与地下采矿联合动态地层运动数值研究

本研究基于相似的材料模拟实验，研究了露天与地下开采相结合的动态地层运动特征。为了获得更准确的测试参数，开发了一种基于脆性材料片的相似材料。然后，我们将安家岭煤矿用作案例研究样本。在类似的模拟测试系统和Continua 3D的快速拉格朗日分析的基础上，通过实验模拟和数值模拟研究了包括24,207、24,208和29,210在内的工作面的动态地层运动特征和床分离裂缝的发展特征。 FLAC ^3D）统计分析软件。实验模拟的结果表明，采矿过程中动态地层的运动可以表示为：地下开采→淹没岩石→“拱形”岩石→“坑式”沉降区域→斜坡裂缝的穿孔。当工作面29,210前进至采矿停止线时，上覆的岩层通常会向斜坡滑动，垂直方向的分离裂缝较少。随着工作面29,210的不断推进，边坡应力显着增加，并在倾斜的岩石中形成了一个滑动面或潜在的滑动面。此外，数值分析，相似的材料模拟实验和实际的开采结果都相似，