Abstract The irregular particle shape is the significant feature of calcareous sands. It is known that calcareous sands generally show a higher liquefaction resistance than that of quartz sands, but the contribution of particle shape to the liquefaction resistance has not been well understood. In this paper, the particle shapes of calcareous sand, quartz sand and steel ball were quantitively assessed. Then, undrained monotonic and cyclic simple shear tests were conducted to investigate the influence of particle shape on the liquefaction resistance. The particle size and shape before and after simple shear were compared to assess the particle breakage. It is found that the degree of particle breakage is quite small, the surface grinding is the main mode, and the particle shape keeps almost unchanged during cyclic simple shear. Irregular sand particles show slow accumulation of excess pore pressure and need more cycles to trigger liquefaction in cyclic tests. It also shows the liquefaction resistance has a good linear correlation with the overall regularity of sand particles. Based on the fitting parameters, the liquefaction resistance of sand samples with different particle shapes can be directly obtained by the provided overall regularity of the sand particles.

中文翻译：

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颗粒形状对钙质砂抗液化性能的影响

摘要 颗粒形状不规则是钙质砂的显着特征。众所周知，钙质砂通常表现出比石英砂更高的液化阻力，但颗粒形状对液化阻力的贡献尚未得到很好的理解。本文对钙质砂、石英砂和钢球的颗粒形状进行了定量评估。然后，进行不排水单调和循环简单剪切试验，研究颗粒形状对液化阻力的影响。比较简单剪切前后的颗粒大小和形状以评估颗粒破损情况。发现颗粒破碎程度很小，表面研磨是主要方式，在循环简单剪切过程中颗粒形状几乎保持不变。不规则的砂粒表现出超孔隙压力的缓慢积累，在循环试验中需要更多的循环才能触发液化。也说明抗液化能力与砂粒的整体规律性具有良好的线性相关性。根据拟合参数，通过提供的砂粒整体规律性，可以直接得到不同颗粒形状砂样的抗液化能力。