岩土力学2025，Vol.46Issue(11)：3346-3354,9.DOI:10.16285/j.rsm.2025.0093
考虑不同级配影响的填石路基压实质量评价研究
Research on evaluation of compaction quality of rock-filled subgrade considering the influence of different gradations
摘要
Abstract
Evaluating the compaction quality of rock-filled subgrades rapidly and accurately poses a pressing challenge in highway engineering.To address this,this study establishes a discrete element-finite difference coupling model to simulate the response of rock-filled subgrades under impact loading.The primary parameters of the model are calibrated using indoor large-scale triaxial tests,and the model's accuracy is verified through comparisons between calculated and field data.Furthermore,this study conducts an in-depth analysis of the dynamic response results of five commonly used gradations of rock-filled subgrades under varying degrees of compaction,discussing the influence of gradation fractal dimension and porosity on subgrade deformation response.The findings are as follows:(1)A good exponential relationship between subgrade porosity and resilient modulus is identified,and the concept of settlement ratio is introduced,with a linear relationship between settlement ratio and subgrade porosity being verified.It is suggested that both resilient modulus and settlement ratio should be used as control indicators when evaluating subgrade compaction quality.(2)A prediction function for subgrade resilient modulus considering fill gradation and porosity is obtained,revealing that particle gradation has a significant impact on resilient modulus.Specifically,as the gradation fractal dimension approaches 2.31,the resilient modulus increases more rapidly with decreasing porosity.(3)A settlement ratio of zero corresponds to the ideal compaction state of the subgrade.This study establishes a prediction model for the critical resilient modulus of the subgrade in its ideal state,considering fill gradation,and finds that the critical modulus first increases and then decreases with increasing fractal dimension D,reaching a maximum when D=2.34.These findings aim to provide new methods and theories for evaluating the compaction quality of rock-filled subgrades in engineering.关键词
填石路基/冲击荷载/离散元-有限差分耦合/压实质量/颗粒级配Key words
rock-filled subgrade/impact load/discrete element-finite difference coupling/compaction quality/particle gradation分类
建筑与水利引用本文复制引用
卢正,李梦威,唐楚轩,胡智,赵阳,则志辉,姚海林..考虑不同级配影响的填石路基压实质量评价研究[J].岩土力学,2025,46(11):3346-3354,9.基金项目
国家自然科学基金项目(No.42477205) （No.42477205）
湖北省自然科学基金创新群体项目(No.2023AFA019) （No.2023AFA019）
浙江省交通运输科技计划项目(No.2024019) （No.2024019）
中国博士后科学基金(No.2025M773267) （No.2025M773267）
国家资助博士后研究人员计划(No.GZC20252148).This work was supported by the National Natural Science Foundation of China(42477205),the Innovation Group Project of Natural Science Foundation of Hubei Province(2023AFA019),Zhejiang Provincial Transportation Science and Technology Project(2024019),China Postdoctoral Science Foundation(2025M773267)and China Postdoctoral Fellowship Program of CPSF(GZC20252148). （No.GZC20252148）
