Abstract

The samples of anthracite and bituminous coal are studied in cyclic freeze–thaw at different water contents. In the freeze–thaw cycles, the samples were subjected to continuous ultrasonic sounding. It is found that different contents of water have an essential influence on the spectrum of recorded signals. Regarding the water-unsaturated check samples, the spectrum change is reversible, and the freeze–thaw treatment results in no failure. An increase in the water content of the samples fosters the irreversible change in the spectra of the signals against the background of macro-cracking along stratification planes. Anthracite exhibits higher persistence to freeze–thaw damage than bituminous coal.

中文翻译：

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来自超声扫描数据光谱分析的煤在冻融条件下的失效机理

摘要

无烟煤和烟煤样品在不同含水量的循环冻融中进行了研究。在冻融循环中，对样品进行连续超声波探测。发现不同的水含量对记录信号的频谱有重要影响。对于水不饱和检查样品，光谱变化是可逆的，冻融处理没有失败。样品中水含量的增加促进了信号光谱在沿层平面宏观裂纹背景下的不可逆变化。与烟煤相比，无烟煤表现出更高的冻融损伤持久性。