Abstract Disaster prevention effect of hydraulic techniques in mines depends on the migration range of water and the wetting degree of coal body. Therefore, it is of great significance to study the interaction among accumulated coal grains and water during migration and flow. First, this paper simulates the migration and wetting process of water and coal grains with an inverse spontaneous imbibition experiment. Then, theoretical and experimental results are compared to determine the optimal determination method of grain diameter as a key parameter in model. The research shows that the lower the metamorphic grade is, the more obvious the imbibition, and the grain diameter of approximately 100–297 μm produces the greatest imbibition effect. At the same time, after realizing that large grains have a dominant influence on formation of imbibition channels, the traditional mathematical model of imbibition height is improved and thus provides a theoretical guiding significance for improving hydraulic techniques.

中文翻译：

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堆积煤粒自吸特性试验研究

摘要 矿井水力技术的防灾效果取决于水的运移范围和煤体的润湿程度。因此，研究运移和流动过程中堆积的煤粒与水的相互作用具有重要意义。首先，本文通过逆自吸实验模拟了水和煤颗粒的运移和润湿过程。然后，将理论和实验结果进行比较，以确定作为模型中关键参数的晶粒直径的最佳确定方法。研究表明，变质等级越低，渗吸作用越明显，100~297 μm左右的晶粒产生的渗吸作用最大。同时，