季节性冻土区铁路路基含水率变化特征研究

季节性冻土区路基冻害一直是困扰铁路工程建设和运营的核心问题.针对兰新铁路西段路基冻害严重的问题,探讨不同工程措施对路基冻融循环过程中含水率变化的影响,以及含水率对路基冻结深度及冻胀变形的影响规律.研究结果表明,季节性冻结对兰新铁路西段路基含水率影响的范围在0.4～0.8m,影响深度有限;"隔一挖一"、"隔三挖一"等工程...

Study on the Variation Characteristics of Moisture Content of Railway Subgrade in Seasonally Frozen Soil Area

The frost damage of railway subgrade is consistently the core problem that puzzles road engineering construction and operation in seasonally frozen soil area.In view of the serious problem of subgrade frost damage of Lanzhou Xinjiang Railway,this study mainly focused on the influences of different engineering measures on the variation of water content in the process of freeze-thaw cycle of subgrade.The influence law of moisture content on subgrade freezing depth and frost heave deformation were discussed.The results show that the influence of seasonal freezing on the water content of roadbed in the west section of Lanzhou-Xinjiang Railway is limited,and the maximum depth is about 0.8m and the maximum range is 0.4~0.6 m.Measures including“one excavation after another”and“one excavation after three”can effectively reduce the moisture content and frost heave of subgrade.As the water content decreases by 2%~5%,the frost heave and deformation are reduced by 50%~70%.