Hebei University of Water Resources and Electric E

Hebei University of Water Resources and Electric E ›› 2026, Vol. 36 ›› Issue (2): 44-52.DOI: 10.16046/j.cnki.issn2096-5680.2026.02.008

• Road and Bridge Engineering • Previous Articles     Next Articles

Numerical Simulation Study on Direct Shear Test of Construction Waste Roadbed Fillers Based on PFC2D

LI Yanhong1, YANG Fengyi2,3, YU Nan4, LI Zixuan2, SONG Yang2,3, SUN Weichen5   

  1. 1. Cangzhou Municipal Engineering Co., Ltd., 061007, Cangzhou, Hebei, China;
    2. Department of Transportation Engineering, Hebei University of Water Resources and Electric Engineering, 061001, Cangzhou, Hebei, China;
    3. Hebei Key Laboratory of Geotechnical Engineering Safety and Deformation Control, 061001, Cangzhou, Hebei, China;
    4. Hebei University of Engineering, 056038, Handan, Hebei, China;
    5. School of Urban Geology and Engineering, Hebei GEO University, 050030, Shijiazhuang, Hebei, China
  • Received:2025-12-08 Revised:2026-01-13 Online:2026-06-30 Published:2026-06-22

基于PFC2D的建筑固废路基填料混凝土直剪试验数值模拟研究

李艳红1, 杨凤仪2,3, 于楠4, 李子煊2, 宋杨2,3, 孙伟宸5   

  1. 1.沧州市市政工程股份有限公司,河北省沧州市黄河东路21号 061007;
    2.河北水利电力学院交通工程系,河北省沧州市黄河西路49号 061001;
    3.河北省岩土工程安全与变形控制重点实验室,河北省沧州市黄河西路49号 061001;
    4.河北工程大学,河北省邯郸经济技术开发区太极路19号 056038;
    5.河北地质大学城市地质与工程学院,河北省石家庄市河北大道601号 050030
  • 通讯作者: 宋 杨(1982-),男,河北沧州人,教授,博士,硕士生导师,主要从事交通岩土方面科研与教学工作。E-mail:songyang@hbwe.edu.cn
  • 作者简介:李艳红(1976-),女,河北沧州人,高级工程师,主要研究方向:市政工程及建筑垃圾循环再利用等。E-mail:cangzhouguoxue@163.com
  • 基金资助:
    国家自然科学基金资助项目(51978237);河北水利电力学院基本科研业务费重点培育项目(SYKY2302)

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Abstract: To uncover the mechanism underlying the influence of coarse particle content on the shear behavior of construction waste roadbed fillers, facilitate the high-efficiency utilization of construction waste, and advance green and sustainable development in the transportation sector, this study investigates the effects of varying coarse particle contents (40%, 60%, and 80%) on the mechanical behavior of construction waste roadbed fillers during concrete direct shear tests via Particle Flow Code (PFC2D) numerical simulation rooted in the discrete element method (DEM). The reliability of the numerical model is validated through comparison with experimental data obtained from indoor large-scale direct shear tests.Results demonstrate that both the peak strength and residual strength of the soil exhibit an increasing trend with the rise in coarse particle content, attaining their maximum values at a coarse particle content of 80%. Mesoscopic analysis reveals that changes in coarse particle content significantly influence the distribution of inter-particle contact force chains. This research indicates that coarse particle content ultimately governs the macroscopic mechanical response of the soil by regulating the transmission paths of the mesoscopic force chain network, thereby elucidating the mechanism by which coarse particle content affects the mechanical properties of the soil. The findings provide a reference for theoretical research and engineering practice concerning the engineering characteristics of coarse-grained soils.

Key words: roadbed, construction waste, PFC2D, direct shear test

摘要： 为揭示粗颗粒含量对建筑固废路基填料剪切行为的影响机制,高效利用建筑固废,推动交通领域绿色可持续发展,本文基于离散元法的PFC2D数值模拟,研究不同粗粒含量(40%,60%,80%)对建筑固废路基填料混凝土直剪试验力学行为的影响,并通过对比室内大型直剪试验数据验证模型的可靠性。结果显示,随着粗粒含量的增加,土体的峰值强度和残余强度均呈现增大趋势,且在粗粒含量为80%时达到最大值。同时,从细观角度分析得到粗粒含量的变化显著影响了颗粒间接触力链的分布。研究表明,粗粒含量通过调控细观力链网络传递路径,最终决定了土体的宏观力学响应,揭示了粗粒含量对土体力学特性的影响机制,为粗粒土工程特性的理论研究和工程实践提供了参考依据。

关键词: 路基, 建筑固废, PFC2D, 直剪试验

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