严寒地区高速铁路多跨简支梁桥下部结构变位试验研究

发布时间：2018-01-22 08:05

本文关键词： 高速铁路简支梁桥试验研究冻融循环下部结构变位　出处：《铁道建筑》2017年11期 　论文类型：期刊论文

【摘要】：对一座严寒地区高速铁路多跨简支梁桥在一个完整冻融循环周期的变位情况进行了定期测试和实时监测,分析了桥梁下部结构横向、纵向变位随季节性冻融循环的变化规律。分析结果表明:墩顶变位是由桥墩基础两侧含水率差异导致的,墩顶横向、纵向变位在冻融阶段内均表现出单向发展趋势,并于融化回落后期恢复至变位初始值附近,且土体冻结发展期及融化初期是墩顶变位发展及变化的主要时期;在墩高不大于20 m的情况下,墩顶横向、纵向变位幅值一般不会超过10 mm。
[Abstract]:The displacement of a multi-span simply supported beam bridge in a freeze-thaw cycle of a high-speed railway in severe cold area is tested and monitored periodically, and the transverse structure of the bridge is analyzed. The change of longitudinal displacement with seasonal freeze-thaw cycle. The results show that the displacement of pier top is caused by the difference of water content on both sides of pier foundation, and the pier top is transverse. The longitudinal displacement shows a unidirectional development trend in the freeze-thaw stage and recovers near the initial value of the displacement at the later stage of melting fall. The development period of soil freezing and the initial stage of melting are the main periods of the development and change of the pier top displacement. When the height of the pier is not more than 20 m, the transverse and longitudinal displacement amplitude of the pier top is generally less than 10 m.
【作者单位】：哈大铁路客运专线有限责任公司;
【基金】：中国铁路总公司科技研究开发计划(2015G006-M) 铁道科学技术研究发展中心项目(J2015G007)
【分类号】：U446.1;U448.217
【正文快照】： 我国幅员辽阔,有相当大的地区处于严寒地带。严寒地区的气象特点是年温差和昼夜温差均较大,气候条件恶劣。该地区的铁路桥梁除了承受列车动力荷载、流水冲刷、基础不均匀沉降等作用外,还要承受土体冻融循环和不均匀冻胀的影响[1-2]。下部结构作为支撑上部梁体的重要构件,其工

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