摘要
为实现路基压实的提质增效和绿色低碳,开展了粗粒土路基超厚层(80 cm)变频压实、共振压实和常规工艺压实现场原位试验,揭示了压路机在不同激振频率作用下路基填料的共振压实现象,阐明了超厚层粗粒土路基分层压实度发展规律和力学指标演化规律,分析了超厚层路基压实的油耗及经济效益,提出了基于同频共振的超厚层路基高能级低碳压实技术。结果表明:粗粒土路基在20~25 Hz激振频率下发生同频共振现象,振动轮的振幅提高18%~30%;经静压1遍—高能级共振压实5遍—静压1遍后,超厚层路基的上、中、下3层压实度分别达到95.36%、95.41%和94.13%,沿深度分布均匀性良好,并且压实度、弯沉、动态变形模量和地基系数均满足设计及规范要求;相较于常规工艺碾压,超厚层路基高能级共振压实的二氧化碳排放量和施工成本分别降低42%和39%,施工效率提高46%。
To improve the quality efficiency,and promote green and low-carbon practices in subgrade compaction,a series of field tests were conducted on a large thickness of coarse-grained subgrade(80 cm) at variable frequencies,resonance frequencies,and conventional compaction methods.The phenomenon that the subgrade soil was compacted under different vibration frequencies were revealed.The compaction characteristics of the large thickness of coarse-grained subgrade,as well as the evolution of mechanical parameters,were elucidated.Additionally,the fuel consumption and economic benefits of the compaction of the large thickness subgrade were analyzed.A high-energy,low-carbon compaction technique for large thickness subgrade based on resonance frequency was proposed.Results show that the coarse-grained subgrade exhibits resonance at frequencies between 20 and 25 Hz,with an increase in the vibration amplitude of the roller by 18% to 30%.After one static compaction,followed by five high-energy resonance compactions,and then additional static compaction,the degree of compaction of the thick subgrade reaches 95.36%,95.41%,and 94.13% for the upper,middle,and lower layers,respectively,remaining homogenous along the depth.The degree of compaction,deflection,dynamic deformation modulus,and foundation deformation coefficient all meet design and specification requirements.Compared to conventional compaction,the high-energy resonance compaction reduces carbon dioxide emissions and construction costs by 42% and 39%,respectively.The construction efficiency increases by 46% for the large thickness subgrade.
作者
蒋红光
王育杰
嵇永军
李宜欣
吴传山
张晓勇
JIANG Hongguang;WANG Yujie;JI Yongjun;LI Yixin;WU Chuanshan;ZHANG Xiaoyong(School of Qilu Transportation,Shandong University,Jinan 250002,China;Shandong High-Speed Jiqing Middle Line Highway Co.,Ltd.,Gaomi 261599,Shandong,China;School of Engineering,University of Warwick,Coventry CV47AL,UK;Shandong Hi-Speed Engineering Test Co.,Ltd.,Jinan 250002,China)
出处
《北京工业大学学报》
北大核心
2025年第6期695-704,共10页
Journal of Beijing University of Technology
基金
国家重点研发计划“交通基础设施”重点专项揭榜挂帅项目(2022YFB2603301)
国家自然科学基金资助项目(52378353,51608306)。
关键词
公路
超厚层路基
振动压实
压实度
共振
低碳节能
highway
large thickness subgrade
vibration compaction
degree of compaction
resonance
low carbon and energy-saving
作者简介
蒋红光(1985-),男,副教授,主要从事土动力学与基础工程、轨道交通动力灾变机理与防控技术和路基路面结构设计与路基加固方面的研究,E-mail:hongguang_jiang@sdu.edu.cn。
