Experimental study on the spontaneous imbibition characteristics of accumulated coal grains

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 um 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.

Automated summary

By simulating the migration and wetting process of water and coal grains through inverse spontaneous imbibition experiments, the study reveals the impact of grain size and metamorphic grade on imbibition effect. It suggests improvements to traditional mathematical models and provides theoretical guidance for enhancing hydraulic techniques.