青藏铁路新型路基保温材料应用试验研究  

In-situ Test on Engineering Application of New Thermal-Insulation Materials in Qinghai-Tibet Railway Subgrade

作　　者：苏谦[1] 王迅[1] 刘深[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2007年第4期395-399,共5页Journal of Southwest Jiaotong University

基　　金：铁道部科技开发计划项目(2001G001-B-03)

摘　　要：为考察聚苯乙烯泡沫板(EPS)和聚氨酯泡沫板(PU)的工程应用效果,在青藏铁路多年冻土路基试验段进行了现场测试.结果表明,2种新型保温材料均具有较好的保温隔热性能,且PU板优于EPS板,保温性能与板厚之间存在非线性关系.较之对比断面,有保温板的断面基底年平均地温降低,上限抬升,有利于保护多年冻土.动态行车试验表明,保温板路基满足列车以100 km/h的速度运行的安全性与舒适性要求.In order to investigate the engineering effect of expanded polystyrene （EPS） and expanded polyurethane （PU）, an in-situ test was performed for permafrost subgrade on the Qinghai-Tibet railway. The results indicate that both the materials have a good thermal-insulation property, and the PU is better than the EPS. The relationship between thermal-insulation capability and material thickness is nonlinear. Compared with the non-insulation sections, the annual ground temperature of the thermal-insulation embankment is decreased, the permafrost table is raised, and so the permafrost is protected well. A dynamic test shows that the thermal-insulation subgrade can satisfy the needs of running security and comfort of trains at a speed of 100 km/h.

关 键 词：青藏铁路 保温材料 多年冻土 路基 

分 类 号：U213.14[交通运输工程—道路与铁道工程]