摘要
采用冻胀自动监测、水准观测和轨道动态检测相结合的路基冻胀综合监测体系,对我国季节性冻土地区第1条高速铁路——哈大高铁的路基冻胀进行长期监测,研究其时空特征以及线路平顺性与冻胀发展过程的关系。结果表明:哈大高铁路基的冻融发展变化过程主要表现为初始波动、快速冻胀、稳定冻胀和融化回落4个阶段,其中的快速冻胀和融化回落阶段对线路平顺性的影响最大,是线路维护的重难阶段;哈大高铁路基的冻胀主要发生在基床浅层,是路基防冻胀设计的重点,监测点中冻胀比达到0.9时冻深不超过110cm的占90%,因此可以将冻深110cm作为划分基床浅层冻胀的界限值;哈大高铁路基的冻胀整体上呈逐年改善的趋势。
Long-term monitoring was carried through on the subgrade frost heaving of the first high speed railway in the seasonal frozen soil region of China,namely,Harbin-Dalian high speed railway,to study its spatial-temporal characteristics and the relation between line regularity and frost heaving development by using a comprehensive monitoring system including the automatic monitoring of frost heaving,leveling observation and track dynamic detection.Results show that the subgrade frost heaving process of HarbinDalian high speed railway can be mainly divided into four stages：initial fluctuation,rapid frost heaving,stable frost heaving and thawing settlement.Among which,rapid frost heaving and thawing settlement stages are the most necessary and difficult stages for line maintenance,since these stages can significantly influence line regularity.The subgrade frost heaving of Harbin-Dalian high speed railway mainly occurs in the shallow layer of subgrade bed,which is the key point in the design of frost heaving prevention for high speed railway subgrade.The frost depth less than 110 cm accounts for 90 percent of all the monitoring points when the frost heaving ratio reaches 0.9.Hence,the frost depth of 110 cm can be used as the threshold value for dividing the frost heaving in the shallow layer of subgrade bed.As a whole,the subgrade frost heaving of Harbin-Dalian high speed railway has a trend of a slowdown year by year.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2016年第3期16-21,共6页
China Railway Science
基金
中国铁路总公司科研试验任务(Z2013-038)
中国铁路总公司科技研究开发计划项目(2014G003-A
2015G002-I
2015G006-H)
中国铁道科学研究院铁道科学技术研究发展中心科研项目(J2014G003)
关键词
冻土路基
季节性冻土
冻胀
冻深
监测
线路平顺性
高速铁路
Permafrost subgrade
Seasonal frozen soil
Frost heaving
Frost depth
Monitoring
Line regularity
High speed railway
