Experimental study on freeze-thaw damage characteristics of coal samples of different moisture contents in liquid nitrogen.

ABSTRACT: In this study, the surface crack-propagation law and pore damage characteristics of coal samples of different water contents after they undergo leaching in liquid nitrogen are investigated using a 4 K scientific-research camera, HC-U7 non-metal ultrasonic detector, nuclear magnetic resonance testing technology, and self-made multi-functional three axial fluid-solid coupling test system. Experimental investigations are conducted on coal samples of different water contents before and after they undergo liquid-nitrogen freezing and thawing in order to determine the propagation law of surface fissures, the development law of internal micro-fissures, the development process of internal pores, the change law of the pore-size distribution, and the law of coal-sample deformation and gas seepage du

SUBMITTER: Wang X 

PROVIDER: S-EPMC9633826 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature