季节性冻土地区高速铁路路桥过渡段路基变形特征分析  

Roadbed Deformation Characteristics of Roadbed-Bridge Transition Section for High Speed Railway in Seasonal Frozen Soil Region

作　　者：张玉芝[1,2] 杜彦良 孙宝臣[1] 

机构地区：[1]石家庄铁道大学河北省大型结构健康诊断与控制重点实验室,河北石家庄050043 [2]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《中国铁道科学》2016年第1期39-45,共7页China Railway Science

基　　金：国家科技支撑计划项目(2012BAG05B01);国家重点基础研究发展计划项目(2012CB723301);铁道部科技研究开发计划项目(Z2012-062)

摘　　要：依据在哈大(哈尔滨—大连)高速铁路德惠路桥过渡段2个冻融循环期间实测的地温和路基变形数据,研究季节性冻土地区高速铁路路桥过渡段的路基变形特征。结果表明:路基的冻胀变形主要发生在冻深0~1.2m范围内,且随冻深的增加呈现阶段性增长的特征;基床表层级配碎石的冻胀量约占路基总冻胀量的40%;路基的融沉压缩变形约在1个月内完成;在整个冻融过程中,过渡段差异沉降引起的弯折角基本满足"等于小于1.0×10^(-3) rad"的规范要求;融化稳定后,路基能够基本恢复到冻融之前的状态,冻融引起的过渡段差异沉降也基本消失;采用的路基工程措施及形成的地温场分布等均会不同程度地引起路基内水分的迁移和重分布。The ground temperature and roadbed deformation of Dehui roadbed-bridge transition section of Harbin-Dalian high speed railway during two freeze-thaw cycles were measured. Based on the measured data, the roadbed deformation characteristics of roadbed-bridge transition section for high speed railway in seasonal frozen soil region were studied. The results indicate that the frost heaving deformation of roadbed mainly occurs within the range from 0 to 1.2 m of the frozen depth and increases periodically with the increase of frozen depth. The frost heaving proportion of the graded broken stone of roadbed surface layer is about 40% of total frost heaving. The thawing subsidence and compression of roadbed take about one month. During the whole process of roadbed freezing and thawing, the bending angle induced by differential deformation basically meets the code requirement of ＂less than or equal to 1.0 × 10-3 rad＂. After the stabilization of thawing, the roadbed can basically recover to what it is before freezing and thawing. The differential deformation of transition section derived from freezing and thawing almost disappears. The measures for roadbed engineering and the distribution of ground temperature field can influence water migration and redistribution in roadbed to different extent.

关 键 词：季节性冻土 冻土路基 路基变形 路桥过渡段 高速铁路 

分 类 号：U213.14[交通运输工程—道路与铁道工程]