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<p>In this study, single-particle crushing tests were conducted on coral sand particles with three sieve size fractions, and their particle morphology characteristics were obtained using X-ray micro-computed tomography (μCT). The distribution characteristics of particle size, shape, and intra-particle pore parameters of coral sand, as well as their correlations, were investigated. The influence trends and magnitudes of each particle characteristic on single-particle strength were then quantitatively analyzed through Spearman’s rank correlation coefficients. The results showed that there were significant positive correlations in coral sand between flatness <i>FL</i> and sphericity <i>S</i>, and between sphericity <i>S</i> and convexity <i>C</i>. Significant negative correlation was observed between total intra-particle porosity <i>n</i> and roundness <i>R</i><sub><i>3</i></sub>, indicating that coral sand particles with smoother surfaces had fewer intra-particle pores. Furthermore, coral sand particles with larger particle sizes and higher shape irregularity exhibited lower single-particle strength. For intra-particle pore parameters, lower intra-particle porosity and higher anisotropy and non-uniformity of intra-particle pores in coral sand were associated with higher single-particle strength. Furthermore, an evolutionary polynomial regression (EPR) model was proposed to predict the single-particle crushing strength of coral sand relating to seven particle characteristics, which could approximately predict the single-particle strength of coral sand, with a coefficient of determination (<i>R</i><sup>2</sup>) of 0.825.</p>

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Particle morphology characteristics of coral sand from the South China Sea and their effects on single-particle strength

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月25日

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  • Kaifeng Zeng,
  • Huabei Liu,
  • Zhen-Yu Yin,
  • Gengfu He

摘要

In this study, single-particle crushing tests were conducted on coral sand particles with three sieve size fractions, and their particle morphology characteristics were obtained using X-ray micro-computed tomography (μCT). The distribution characteristics of particle size, shape, and intra-particle pore parameters of coral sand, as well as their correlations, were investigated. The influence trends and magnitudes of each particle characteristic on single-particle strength were then quantitatively analyzed through Spearman’s rank correlation coefficients. The results showed that there were significant positive correlations in coral sand between flatness FL and sphericity S, and between sphericity S and convexity C. Significant negative correlation was observed between total intra-particle porosity n and roundness R3, indicating that coral sand particles with smoother surfaces had fewer intra-particle pores. Furthermore, coral sand particles with larger particle sizes and higher shape irregularity exhibited lower single-particle strength. For intra-particle pore parameters, lower intra-particle porosity and higher anisotropy and non-uniformity of intra-particle pores in coral sand were associated with higher single-particle strength. Furthermore, an evolutionary polynomial regression (EPR) model was proposed to predict the single-particle crushing strength of coral sand relating to seven particle characteristics, which could approximately predict the single-particle strength of coral sand, with a coefficient of determination (R2) of 0.825.