不良级配粉细砂路基碾压数值模拟  

A Numerical Simulation of Compaction of Poorly Graded Silty Fine Sand Roadbeds

作　　者：祝方才[1] 杨志佳 王杰 刘鹏飞 张华雨 ZHU Fangcai;YANG Zhijia;WANG Jie;LIU Pengfei;ZHANG Huayu(College of Civil Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China;2nd Engineering Co.Ltd.,China Railway Beijing Engineering Group Co.,Ltd.,Changsha 410116,China;Communications Construction Company of CSCEC 7th Division Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007 [2]中铁北京工程局集团第二工程有限公司,湖南长沙410116 [3]中建七局交通建设有限公司,河南郑州450003

出　　处：《湖南工业大学学报》2025年第1期1-8,共8页Journal of Hunan University of Technology

基　　金：湖南省自然科学株洲联合基金资助项目(2022JJ50087)。

摘　　要：我国滨海地区存在大量粉细砂,其级配较差,为减少客土使用,可将其用做路基填料。依托海南某旅游公路粉细砂填筑路基项目,建立不良级配粉细砂路基压实过程的PFC2D模型,研究压实作用力、静动碾压和压实遍数的压实效果,建立压实度K和孔隙率n关系。结果发现,不同压实力作用下粉细砂孔隙率沿深度变化不明显,动碾相对于静碾压实效果更好且作用深度更深,随碾压遍数增加,粉细砂孔隙率减小,路基压实度增大,但碾压超过一定遍数后,对压实效果提升不明显。数值模拟与现场试验结果较为一致。Due to the fact that coastal areas of China are characterized with a significant amount of silty fine sand with poor gradation,it can be used as roadbed filling materials for the reduction of the reliance on foreign soil.Based on a tourist highway progect in Hainan,a PFC2D model has been established for the compaction process of poorly graded fine sand subgrades,followed by a research on the compaction effects of compaction force,static and dynamic rolling,and compaction passes,thus building the relationship between compaction degree K and porosity n.The results show that the porosity of fine sand remains relatively consistent at different depths under varying rolling compaction forces.Compared to static rolling,dynamic rolling is characterized with better compaction effect and deeper action depth.As the number of rolling passes increases,the porosity of fine sand decreases while the compaction degree of the roadbed increases.However,after a certain number of rolling passes,the improvement in compaction effect becomes less significant.The numerical simulation results are consistent with the field test results.

关 键 词：不良级配粉细砂 PFC2D 碾压 压实度 孔隙率 

分 类 号：TU43[建筑科学—岩土工程]