基于非均质模型的水稳碎石材料细观开裂行为

doi:10.13229/j.cnki.jdxbgxb.20221156

吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (5): 1258-1266.doi: 10.13229/j.cnki.jdxbgxb.20221156

• 交通运输工程·土木工程 • 上一篇

基于非均质模型的水稳碎石材料细观开裂行为

赵晓康(),胡哲,牛振兴,张久鹏(),裴建中,温永

长安大学公路学院，西安 710064

收稿日期:2022-09-07 出版日期:2024-05-01 发布日期:2024-06-11
通讯作者: 张久鹏 E-mail:zhaoxk@chd.edu.cn;zhjiupeng@chd.edu.cn
作者简介:赵晓康（1987-），男，讲师，博士.研究方向：道路材料微细观表征及数值仿真. E-mail： zhaoxk@chd.edu.cn
基金资助:
陕西省2024年自然科学基础研究计划项目(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基金项目(MSAF-2023-108)

Meso-cracking behavior of cement-stabilized macadam materials based on heterogeneous model

Xiao-kang ZHAO(),Zhe HU,Zhen-xing NIU,Jiu-peng ZHANG(),Jian-zhong PEI,Yong WEN

School of Highway，Chang'an University，Xi'an 710064，China

Received:2022-09-07 Online:2024-05-01 Published:2024-06-11
Contact: Jiu-peng ZHANG E-mail:zhaoxk@chd.edu.cn;zhjiupeng@chd.edu.cn

摘要/Abstract

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。

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

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.

Key words: road engineering, cement-stabilized macadam, mesoscopic heterogeneity, semicircle bending test, discrete element method

中图分类号:

U416.214

赵晓康,胡哲,牛振兴,张久鹏,裴建中,温永. 基于非均质模型的水稳碎石材料细观开裂行为[J]. 吉林大学学报(工学版), 2024, 54(5): 1258-1266.

Xiao-kang ZHAO,Zhe HU,Zhen-xing NIU,Jiu-peng ZHANG,Jian-zhong PEI,Yong WEN. Meso-cracking behavior of cement-stabilized macadam materials based on heterogeneous model[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(5): 1258-1266.

图/表 12

图1

图2

表 1

模型材料力学参数"

细观参数	集料内部	砂浆内部	ITZ	集料之间
有效模量 $E$ /Pa	55.5e9	0.17e8	0.12e8	55.5e9
刚度比 $k$	5.0	1.1	1.1	5.0
抗拉强度 $σ$ /Pa	2.4e7	0.63e6	0.42e6	0
粘结强度 $c$ /Pa	2.4e7	1.26e6	0.84e6	0

表 1

图3

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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

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