AUTHOR=Shi Guodong , Yao Duoxi , Wu Jiehao , Meng Fangyi 

TITLE=Experimental study on dynamic characteristics and energy dissipation of weakly cemented rock-like materials

JOURNAL=Frontiers in Materials

VOLUME=Volume 12 - 2025

YEAR=2025

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2025.1629892

DOI=10.3389/fmats.2025.1629892

ISSN=2296-8016

ABSTRACT=The structural stability of coal seam roof rock mass under dynamic load in engineering practice is directly influenced by the dynamic characteristics of weakly consolidated coal measures rock. A study was conducted on two types of rocks, mudstone and siltstone, around the roof of coal seam No. 31 in Renlou Coal Mine, northern Anhui Province. Rock-like specimens were created using similar materials for analysis. The mechanical properties, energy dissipation characteristics, and fractal characteristics of these rocks were investigated using a 75 mm Split Hopkinson Pressure Bar (SHPB) test system at five different impact velocities. The findings are as follows: 1) As the impact velocity increases, the strain rate of the rock linearly increases while the dynamic uniaxial compressive strength exponentially increases. 2) With an increase in strain rate, there is a negative correlation between rock fragmentation and a positive correlation with the number of fragments produced; additionally, the fractal dimension shows an increasing quadratic term function relationship. 3) There exists a linear positive correlation between incident energy and impact velocity; moreover, as incident energy increases, so does the amount of energy lost due to rock breakage. These research results provide both theoretical and experimental foundations for mine dynamic disaster protection.