基于面心立方晶胞细观模型的半刚性路面材料强度与破坏模式数值研究
Numerical Study on Strength and Failure Modes of Semi-Rigid Pavement Materials Based on Meso?Scale Face?Centered Cubic Cell Model
摘要
为分析半刚性路面材料在单轴压缩、单轴拉伸、劈裂及板式压缩四种典型受力模式下的强度与破坏特征，基于面心立方晶胞堆叠假设，将混合料视为刚性骨料与弹性胶结料组成的二相体系，开发了三维离散元有限元程序。程序采用增量加载与接触体渐进破坏迭代算法，输出宏观强度及拉伸、剪切破坏的接触体数量。针对固定尺寸试件（轴向、劈裂试验：直径150?mm、高150?mm；板式压缩：板厚60?mm、边长240?mm），计算了不同胶结料内聚力、弹性模量、泊松比及骨料尺寸下的响应。结果表明：所有受力模式下宏观强度均与内聚力呈线性正比，胶结料内聚力是控制强度的主要因素；随骨料尺寸减小，试件强度趋于稳定；胶结料弹性模量对强度影响极小；泊松比减小时强度升高。轴向拉伸为脆性破坏，弹性极限即强度极限，胶结料仅发生拉伸破坏，其强度约为轴向压缩强度的 7%；轴向压缩、劈裂、板式压缩因应力重分布，极限强度大于弹性极限，胶结料拉伸和剪切破坏并存。本文程序开源，可为半刚性路面材料设计提供细观力学依据。
Abstract
To analyze the strength and failure characteristics of semi rigid pavement materials under four typical loading modes (uniaxial compression, uniaxial tension, splitting, and plate compression), a three dimensional discrete element finite element program was developed based on the face centered cubic cell stacking assumption, in which the mixture is treated as a two phase system composed of rigid aggregates and elastic binder. The program adopts incremental loading and iterative contact element progressive failure algorithms, outputting macroscopic strength and the numbers of tensile and shear failed contacts. For specimens of fixed sizes (axial and splitting tests: diameter 150?mm, height 150?mm; plate compression: slab thickness 60?mm, side length 240?mm), responses were calculated for different binder cohesions, elastic moduli, Poisson\'s ratios, and aggregate sizes. The results show that under all loading modes the macroscopic strength is linearly proportional to the cohesion; the binder cohesion is the dominant factor controlling strength. As the aggregate size decreases, the strength tends to stabilize. The binder elastic modulus has negligible effect on strength. A decrease in Poisson\'s ratio increases the strength. Uniaxial tension exhibits brittle failure with the elastic limit equal to the ultimate strength, only tensile failure occurs in the binder, and its strength is about 7% of the uniaxial compressive strength. In contrast, uniaxial compression, splitting, and plate compression show ultimate strengths greater than their elastic limits due to stress redistribution, with both tensile and shear failures coexisting in the binder. The program is open sourced, providing a meso mechanical basis for the design of semi rigid pavement materials.关键词
道路工程/半刚性路面/细观结构/面心立方晶胞/渐进破坏/板式压缩Key words
road engineering/semi?rigid pavement/meso?structure/face?centered cubic cell/progressive failure/plate compression引用本文复制引用
成晟.基于面心立方晶胞细观模型的半刚性路面材料强度与破坏模式数值研究[EB/OL].(2026-06-12)[2026-06-15].http://www.paper.edu.cn/releasepaper/content/202606-39.学科分类
公路运输工程
