中国铁道科学2025，Vol.46Issue(6)：55-66,12.DOI:10.3969/j.issn.1001-4632.2025.06.06
高等减振地段双孔限位装配板式无砟轨道试验研究
Experimental Study on Double-Hole Positioning Prefabricated Slab Ballastless Track in Advanced Vibration Mitigation Sections
摘要
Abstract
To explore the mechanical properties of the high-performance vibration-damping double-hole positioning-assembled slab ballastless track,a 1∶1 full-scale test model was established,and static load,fatigue,longitudinal and lateral push plate,and axle drop tests were conducted.The load-bearing capacity,fatigue performance,stability,and vibration-damping effect of the track structure were systematically analyzed,and the force and deformation laws were revealed.The research results show that:under a vertical load of 425 kN,the vertical displacements of the rail,track slab,and self-compacting concrete layer decrease sequentially;the vertical static stiffness of the track slab is 380.14 kN·mm-1;the force and deformation of the track structure increase linearly,meeting bearing capacity requirements.After 5 million fatigue tests,vertical displacements of the rail and track slab increase by 4.51%and 5.66%,respectively;the static stiffness decreases by 9.92%,the overall force of the track structure fluctuates moderately,with no surface cracks observed,indicating stable mechanical performance.Under a longitudinal thrust of 240 kN,the maximum longitudinal displacement of the positioning hole is 0.37 mm,the longitudinal stiffness is 876.3 kN·mm-1,the elastic buffer sleeve significantly reduces the force on the boss,ensuring good performance of the positioning boss.Under a 136 kN lateral thrust,the maximum lateral displacement of the track slab is 0.17 mm,the lateral stiffness is 786.9 kN·mm-1,and the peak compressive stress around the positioning hole of the track slab does not exceed 1.02 MPa.The maximum difference in ground frequency-divided vibration level for high-grade vibration-reducing tracks occurs at 100 Hz center frequency,approaching the first-order natural frequency of the system around 25 Hz.The average insertion loss before and after fatigue testing decreases from 11.92 dB to 11.37 dB with a 4.61%reduction,satisfying the requirements for advanced vibration reduction.关键词
市域铁路/轨道结构/装配式无砟轨道/双孔限位/高等减振/试验研究Key words
Regional railway/Railway track structure/Prefabricated ballastless track/Double-hole positioning/Advanced vibration mitigation/Experimental study分类
交通工程引用本文复制引用
任西冲..高等减振地段双孔限位装配板式无砟轨道试验研究[J].中国铁道科学,2025,46(6):55-66,12.基金项目
国家重点研发计划项目(2023YFB2604301-3) （2023YFB2604301-3）
中铁第四勘察设计院集团有限公司科技研发课题(CY2025001S,KY2024002S,KY2024021S) （CY2025001S,KY2024002S,KY2024021S）
