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乌克兰顿涅茨克工学院测定了层间石灰岩的显微硬度随时间的变化，研究了层间岩石硬度对保护层开采时的保护作用大小的影响。分析测量结果可以划分出石灰岩显微硬度随时间的下述变化特点：垂直于层理的显微硬度超过沿层理的２３％。实验数据的分散性（相关系数）为第二组情况的
The Donetsk Institute of Technology in Ukraine measured the variation of the microhardness of interlayer limestone over time and studied the effect of interlaminar rock hardness on the protective effect of protective layer mining. Analysis of the measurement results can characterize the following changes in limestone microhardness over time: The microhardness perpendicular to the bedding exceeds 23% of the bedding. The dispersion of experimental data (correlation coefficient) is the second case