中国铁道科学2017，Vol.38Issue(3)：1-9,9.DOI:10.3969/j.issn.1001-4632.2017.03.01
寒区高速铁路路基冻胀数值模型及防冻胀措施
Numerical Model of Frost Heaving and Anti-Frost Heave Measures of High Speed Railway Subgrade in Cold Region
摘要
Abstract
The Frost heaving and thawing settlement of high speed railway subgrade in cold region directly affect the high-speed,safe and stable operation of the train.Based on the theories of unsaturated soil seepage and heat transfer,the moisture and temperature fields of frozen soil are coupled to establish the moisture-temperature coupling differential equation for frozen soil.Based on the similarity between isotropic volume expansion of soil and the thermal expansion of material,subgrade frost heaving model is established.The ice content is calculated by water-heat coupling model and the frost heaving deformation of subgrade is calculated by hydrodynamic frost heaving model.Numerical calculation and measured results show that the subgrade frost heaving deformation law is basically the same.The frost heaving peak values all occur when subgrade reaches the maximum freezing depth and freezing layer begins to melt bidirectionally,and the validity of the numerical model is verified.The frost heaving deformation of three different kinds of subgrade at the moment of the strongest frost heaving effect has been calculated according to the established numerical model respectively,namely,subgrade only with insulation board,subgrade with both insulation board and asphalt concrete pavement as well as subgrade with insulation board,asphalt concrete pavement and gravel.Results show that the frost heaving deformation of subgrade with insulation board,asphalt concrete pavement and gravel is the minimum (the maximum value is 1.3 mm) while the subgrade with insulation board is the maximum (the maximum value is 3.2 mm).The sub grade with insulation board,asphalt concrete pavement and gravel is recommended to be applied for high speed railway in cold region to minimize the frost heaving deformation of subgrade.关键词
路基/寒区/冻胀/数值模型/冻结深度/防冻胀措施/高速铁路Key words
Subgrade/Cold region/Frost heaving/Numerical model/Freezing depth/Anti-frost heave measure/High-speed railway分类
交通工程引用本文复制引用
邰博文,刘建坤,李旭,岳祖润,沈宇鹏..寒区高速铁路路基冻胀数值模型及防冻胀措施[J].中国铁道科学,2017,38(3):1-9,9.基金项目
国家自然科学基金资助项目(51178281,41171064) （51178281,41171064）
国家“九七三”计划项目(2012CB026104) （2012CB026104）
中国铁路总公司科技研究开发计划项目(2014G003-A) （2014G003-A）
中央高校基本科研业务费专项资金资助项目(2015JBM064) （2015JBM064）
