AUTHOR=Liu Xuejun , Zeng Kaifeng , Xiang Fuyu , Wang Chunhai , Hou Xianming , Li Yanjun 

TITLE=Study on the interaction between particle shape and particle breakage of coral sand by discrete element method

JOURNAL=Frontiers in Earth Science

VOLUME=12

YEAR=2024

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1343307

DOI=10.3389/feart.2024.1343307

ISSN=2296-6463

ABSTRACT=<p>A series of biaxial tests with different initial particle shapes, confining pressures, bond strengths and depositional angles were conducted on coral sand by using a 2D discrete element method simulation. The interactions between particle shape and particle breakage were investigated, and their combined effects on the mechanical behavior of coral sand were analyzed. The test results showed that particle breakage considerably weakens the effect of particle shape and inherent anisotropy on shear strength. The difference between the internal friction angles of unbreakable and breakable agglomerates Δ<italic>φ</italic> decreases with increasing aspect ratio <italic>AR</italic>, sphericity <italic>S</italic>, and depositional angle <italic>θ</italic>. There exists a unique relationship between the relative breakage <italic>Br</italic><sub><italic>De</italic></sub> and the input energy <italic>E</italic> for the same agglomerates, which is independent of axial strain and confining pressure. However, this relationship is significantly influenced by the agglomerate shape and depositional angle, and irregular and low depositional angle specimens are more easily broken. In addition, the evolution of the aspect ratio <italic>AR</italic> and sphericity <italic>S</italic> of agglomerates was controlled by particle breakage, regardless of the axial strain, confining pressure, bond strength and depositional angle, and these trends were determined by the initial particle shape.</p>