摘要
针对无砟轨道路基翻浆整治问题,考虑水混合、水浸泡和高低温循环作用三种工况,对聚氨酯固结体表观性能和力学性能进行了试验研究。结果表明:水与聚氨酯浆体直接混合时,聚氨酯固结体的体积膨胀率随掺水率增加而逐渐增大,但掺水率不大于0.3%时体积膨胀率变化幅度较小;聚氨酯固结体的力学性能指标随掺水率增加而逐渐减小,但掺水率控制在0.1%以内时力学性能指标受影响较小。水浸泡基本不会影响聚氨酯固结体的表观性能和力学性能。随高低温循环次数增加,聚氨酯固结体的抗压强度和抗拉强度逐渐减小,但减幅很小,环境温度在-30~50℃波动时聚氨酯固结体仍可以保持良好的力学性能。因此,在无砟轨道基床注浆整治过程中,为降低水对聚氨酯固结体力学性能的影响,建议采取措施将层间含水率控制在0.1%以内。
This study addresses the challenges associated with renovating ballastless track subgrade using polyurethane solidified materials.We conducted experiments under three key conditions:water mixing,water immersion,and high and low-temperature cycles to examine the apparent and mechanical properties of these materials.Our findings indicate that when polyurethane slurry is mixed with water,as water content increases,the volume expansion rate of polyurethane solidified materials also increases gradually,but the impact is minor when water content remains below 0.3%.Mechanical performance metrics of these materials decrease gradually with higher water content,although the influence is minimal when water content is controlled within 0.1%.Moreover,water immersion has a negligible effect on the apparent and mechanical properties of polyurethane solidified materials.As the number of high and low-temperature cycles increases,compressive strength and tensile strength gradually decline,but to a limited extent.Notably,even with temperature fluctuations ranging at-30~50℃,polyurethane solidified materials maintain robust mechanical performance.Thus,during the process of injecting treatments for ballastless track subgrade,it is advisable to manage interlayer water content to be within 0.1%to mitigate the impact of water on the mechanical properties of polyurethane solidified materials.
作者
叶盛
王迅
靳静
梁小勇
李栋
YE Sheng;WANG Xun;JIN Jing;LIANG Xiaoyong;LI Dong(Science and Technology Research Institute,China Railway Jinan Group Co.Ltd.,Jinan 250031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)
出处
《铁道建筑》
北大核心
2023年第10期37-41,共5页
Railway Engineering
基金
神华包神铁路有限责任公司科技创新项目(CSIEZB180300661)。
关键词
无砟轨道路基
工程材料
试验研究
翻浆整治
聚氨酯
水混合
水浸泡
高低温循环
ballastless track subgrade
engineering materials
experimental study
mud pumping treatment
polyurethane
water mixing
water immersion
high and low-temperature cycles
