山东建筑大学学报2026，Vol.41Issue(3)：12-21,10.DOI:10.12077/sdjz.2026.03.002
基于PFC离散元混凝土路基填料破碎与压实特性分析
Analysis of crushing and compaction characteristics of concrete subgrade filler based on PFC discrete element method
摘要
Abstract
To investigate the crushing behavior of waste concrete blocks as subgrade fill material during compaction and the impact of different construction techniques on compaction degree,a discrete element software PFC was used to establish a concrete subgrade fill model and conduct compaction simulations.The factors influencing the crushing rate of the fill material(compaction load,number of passes,and spreading thickness)were systematically analyzed,and the effects of varying compaction passes on the compaction degree were examined from a microscopic perspective based on contact force chains and velocity fields.The results indicate that for concrete fill models with spreading thicknesses of 30,40,and 50 cm,the minimum compaction loads required to achieve relatively stable internal crushing rates and porosity were 20,25,and 30 MPa,respectively,with the minimum number of passes being 7,11,and 16.The mechanical strength(uniaxial compressive strength)and structural stability indicators(porosity)of the particle aggregates formed by waste concrete after compaction meet the requirements of subgrade specification fill materials.In practical engineering,the selection of compaction load and compaction passes should comprehensively consider the effects of different spreading thicknesses on crushing rate,porosity,and settlement to improve construction efficiency and reduce costs.关键词
路基填料/破碎率与压实度/离散元/废弃混凝土碎块Key words
subgrade filling/crushing rate and compactness/discrete element/waste concrete fragment分类
交通工程引用本文复制引用
张智,范家辉,王培森,宋辰宁..基于PFC离散元混凝土路基填料破碎与压实特性分析[J].山东建筑大学学报,2026,41(3):12-21,10.基金项目
山东省工业和信息化厅2022年山东省企业技术创新项目(202260101480) （202260101480）
山东省自然科学基金面上项目(ZR2024ME056) （ZR2024ME056）
