吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (4): 1045-1057.doi: 10.13229/j.cnki.jdxbgxb.20220699
• 交通运输工程·土木工程 • 上一篇
万铜铜1(),汪海年1(
),郑文华1,冯珀楠1,陈玉1,张琛2
Tong-tong WAN1(),Hai-nian WANG1(
),Wen-hua ZHENG1,Po-nan FENG1,Yu CHEN1,Chen ZHANG2
摘要:
为揭示级配碎石基层与沥青混合料面层的温度收缩协调变形规律,本文采用动静态应变采集系统实时获取沥青混合料层的温缩应变,基于PFC6.0 Suite和FLAC3D构建了组合结构连续-离散耦合模型,探究了级配碎石层与沥青混合料层温缩协调变形宏观和细观响应规律。研究结果表明:连续-离散耦合模型与室内试验的吻合度相比连续介质模型高,温缩系数相对误差最大为8.1%;沥青混合料及其组合试件温缩应变-时间关系曲线均呈先快后慢的非线性变化规律,沥青混合料类型及降温温差对级配碎石的约束作用基本无影响;组合试件温缩变形主要发生在前1 h内,沥青混合料层整体由“翘起”状逐渐过渡到“平缓”状;级配碎石层通过颗粒向内挤压运动,使两端松散膨胀及颗粒接触重组来实现与沥青混合料层的协调变形。本文从宏观应变响应与空隙率、配位数及三维组构细观响应揭示温缩协调变形机制,研究结果可为级配碎石基层沥青路面低温抗裂研究提供理论参考。
中图分类号:
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