Calcareous sand (CS) is a special geomaterial that is susceptible to particle breakage. In order to clarify the effects of coarse-particle content (CC) and impact energy (E_b) on CS particle breakage, multiple impact tests were conducted on CS, and fractal dimension (α) and relative breakage ratio (Br) were introduced to quantitatively assess the CS particle breakage under varying conditions. According to the results, (I) the CS particle breakage during impact testing caused an increase in α. (II) The ultimate fractal dimension for CS under impact loading ranged from 2.16 to 2.73 and was only related to its initial fractal dimension. (III) A mathematical model capable of predicting the α of CS according to its initial median particle size and E_b was built, and the rationality of this model was validated. (IV) The Br of CS increased following a logarithm function with increasing CC and a hyperbolic function with increasing E_b. (V) The relationship between α and Br was established for CS under impact loading. These results can provide a theoretical basis for further research on the influence of particle breakage on strength parameters of CS under impact loading.

钙质砂（CS）是一种特殊的地质材料，容易受到颗粒破碎。为了阐明粗颗粒含量（CC）和冲击能（_Eb）对CS颗粒破碎的影响，对CS、分形维数（ α）和相对破碎率（Br ）进行了多次冲击试验。) 被引入以定量评估不同条件下的 CS 颗粒破损。根据结果​​，(I) 冲击试验中的 CS 颗粒破碎导致 α 增加。(II) CS在冲击载荷作用下的最终分形维数范围为2.16~2.73，仅与其初始分形维数有关。（三）建立了根据初始中值粒径和E _b预测CS的α的数学模型，验证了该模型的合理性。(IV) CS 的Br随着CC的增加呈对数函数增加，随着E _b的增加呈双曲线函数增加。（五）α与Br的关系为冲击载荷下的 CS 建立。这些结果可为进一步研究颗粒破碎对冲击载荷作用下CS强度参数的影响提供理论依据。