基于非均质模型的水稳碎石材料细观开裂行为
Meso-cracking behavior of cement-stabilized macadam materials based on heterogeneous model
赵晓康 1胡哲 1牛振兴 1张久鹏 1裴建中 1温永1
作者信息
- 1. 长安大学 公路学院,西安 710064
- 折叠
摘要
本文采用离散元法(DEM)研究非均质水稳碎石(CSM)材料的细观开裂行为,基于Weibull材料随机场,建立了不同均质度水平的CSM细观断裂模型,通过虚拟半圆弯曲(SCB)试验模拟细观开裂过程,分析砂浆基体均质度的影响.结果表明:CSM裂纹沿着砂浆薄弱点和界面共同扩展,砂浆基体的断裂占主导地位.峰值强度和破坏形变随均质度的提高而增大,砂浆中少量的性能薄弱点有益于改善结构形变特性而提升其整体强度,适当均质度水平有助于CSM材料抗裂性能的发挥.
Abstract
The purpose is to investigate the mesoscopic cracking behavior of heterogeneous cement-stabilized macadam(CSM)materials using the discrete element method(DEM).According to Weibull distribution material random field,the heterogeneous fracture models with different homogenization levels were established.The virtual semicircular bending(SCB)tests were carried out to simulate the mesoscopic cracking process.The influence of mortar heterogeneity on mesoscopic cracking behavior of CSM was further studied.The results show that the CSM cracks tend to propagate along the weak mortar and the interfacial transition zone,and the fracture of mortar matrix was dominant.The peak strength and failure deformation of CSM material increase with the increase of mortar homogeneity.A small amount of weak mortar matrix is beneficial to improve the structure deformation characteristics and enhance its overall strength.The optimum crack resistance of CSM materials can be obtained by maintaining reasonable homogenization levels of mortar matrix.
关键词
道路工程/水泥稳定碎石/细观非均质/半圆弯曲试验/离散元法Key words
road engineering/cement-stabilized macadam/mesoscopic heterogeneity/semicircle bending test/discrete element method引用本文复制引用
基金项目
陕西省自然科学基础研究计划(2024)(2024JC-YBMS-373)
重大工程材料服役安全研究评价设施国家重大科技基础设施开放课题(MSAF-2023-108)
出版年
2024
NETL
NSTL
万方数据