Abstract

Fragile angular-shaped granular materials, such as calcareous sand, rockfill material, and ballast, show complex stress–strain–volumetric relationships due to the effects of particle breakage. This paper presents a proposed constitutive model to simulate the effects of particle breakage on the mechanical response of calcareous sand and rockfill materials in drained triaxial tests previously conducted by other researchers. Experimental results revealed an increase in roundness and a decrease in the critical stress ratio with increased particle breakage in these materials. A breakage parameter is introduced to describe the breakage behaviour of fragile angular-shaped particles. The proposed model includes the effects of the density, stress level, and particle breakage of granular materials. The simulated results show satisfactory agreement with experimental data. Thus, the newly established constitutive model can be used to predict the influence of material density, stress level, and particle breakage in drained triaxial tests of fragile angular-shaped granular materials.

摘要

由于颗粒破碎的影响，易碎的角状颗粒材料，如钙质砂、堆石材料和道碴，表现出复杂的应力-应变-体积关系。本文提出了一种建议的本构模型，用于模拟颗粒破碎对其他研究人员先前进行的排水三轴试验中钙质砂和堆石材料的机械响应的影响。实验结果表明，随着这些材料中颗粒破碎的增加，圆度增加，临界应力比降低。引入了破碎参数来描述易碎角形颗粒的破碎行为。所提出的模型包括颗粒材料的密度、应力水平和颗粒破碎的影响。模拟结果与实验数据显示出令人满意的一致性。因此，新建立的本构模型可用于预测脆性角状颗粒材料排水三轴试验中材料密度、应力水平和颗粒破裂的影响。