重载铁路道砟清洁度对聚氨酯固化道床力学性能的影响  

Impact of Ballast Cleanliness on Mechanical Properties of Polyurethane Solidified Ballasted Track Bed in Heavy Haul Railway

作　　者：郄录朝 余文颖 徐旸 李毅 许良善 韩宏洋 QIE Luchao;YU Wenying;XU Yang;LI Yi;XU Liangshan;HAN Hongyang(State Key Laboratory for Track System of High-speed Railway,CARS,Beijing 100081,China;Railway Engineering Research Institute,CARS,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司高速铁路轨道系统全国重点实验室,北京100081 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道建筑》2023年第9期1-4,共4页Railway Engineering

基　　金：国家能源投资集团有限责任公司技术开发课题(GJNY-19-91)。

摘　　要：道砟颗粒表面清洁度分别取0.17%、0.50%、0.70%、1.00%,通过室内实尺模型疲劳试验,分析500万次疲劳荷载作用下聚氨酯固化道床沉降、道床静态模量的变化规律以及轨枕与道床的黏结性能。结果表明,当道砟清洁度超过0.50%后,聚氨酯固化道床沉降明显增大,道床静态模量无明显变化,轨枕与道床黏结性能变差。建议聚氨酯固化道床施工时,在道砟装载、运输过程中采取措施防止道砟二次污染,上砟整道时采取少捣多稳工艺,确保固化道床浇注前道砟清洁度在0.50%以内。This study examines the cleanliness of ballast at various levels(0.17%,0.50%,0.70%,and 1.00%)and their impact on the performance of polyurethane solidified track bed through indoor full-scale fatigue tests conducted over 5 million cycles.The research analyzes the settlement of the polyurethane solidified ballasted track bed,changes in the track bed’s static modulus,and the bonding performance between sleepers and the track bed under these conditions.The findings reveal that once the track ballast cleanliness surpasses 0.50%,there is a significant increase in settlement of the polyurethane solidified track bed.However,the static modulus of the track bed remains relatively stable,while the bond between sleepers and the track bed weakens.Based on these results,it is recommended that preventive measures be taken during ballast loading and transportation to avoid secondary contamination.Furthermore,employing construction techniques that minimize tamping and ensure stability during ballast laying is advised to maintain ballast cleanliness below 0.50%before pouring the polyurethane.

关 键 词：重载铁路 道砟清洁度 聚氨酯固化道床 力学性能 沉降变形 道床静态模量 黏结性能 

分 类 号：U216.6[交通运输工程—道路与铁道工程]