Gas depletion results in shrinkage of the coal bed and hence in distortion of the stress–strain state near the face. The swelling of the coal is plotted against its yield of volatiles (its coalification). By randomization of the data, the shrinkage of the coal is expressed as a function of two variables: its yield of volatiles and its methane capacity. Knowing the gas depletion at the face and the dependence of the bed shrinkage on its methane capacity, we describe the variation in bed thickness as a function of the distance from the face.

中文翻译：

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工作面煤层收缩

瓦斯枯竭导致煤层收缩，从而导致工作面附近的应力-应变状态变形。煤的膨胀与挥发物的产率（煤化）相对应。通过数据的随机化，煤的收缩率表示为两个变量的函数：挥发物的产量和甲烷容量。了解了工作面的气体消耗以及床层收缩对其甲烷容量的依赖性，我们将床层厚度的变化描述为与工作面距离的函数。