青藏高速公路路基降温措施有效性模拟分析

发布时间：2018-02-24 07:38

本文关键词： 多年冻土宽幅路基温度场隔热层碎石路基复合路基　出处：《湖南大学学报(自然科学版)》2016年11期 　论文类型：期刊论文

【摘要】：为了评价已有的冻土路基工程技术对青藏高原多年冻土区高等级公路宽幅路基的适用性,运用ABAQUS有限元软件及其二次开发平台,建立了多年冻土地区宽幅路基温度场有限元分析模型,并运用该模型对普通路基、碎石路基、EPS隔热层路基以及隔热层-碎石复合路基温度场进行对比分析,对4种宽幅路基融深变化规律进行研究.结果表明,不同降温措施条件下路基温度随时间均呈周期变化,但每年平均温度总体上升,且相同的时间和路基宽度条件下,隔热层-碎石复合路基温度最低、热稳定性最好;普通路基第十年最大融深随路基宽度的增加呈直线上升趋势,碎石路基融深随宽度的增加呈三阶段增长趋势,EPS隔热层路基融深随宽度的增加呈两阶段增长趋势,复合路基融深随着宽度的增加逐渐增加但变化不大;单一的EPS隔热层措施、碎石路基对于多年冻土区宽幅路基降温效果较差,隔热层-碎石复合路基降温效果最优.
[Abstract]:In order to evaluate the applicability of existing permafrost subgrade engineering technology to the broad embankment of highway in permafrost region of Qinghai-Tibet Plateau, the ABAQUS finite element software and its secondary development platform are used. The finite element analysis model of temperature field of broad embankment in permafrost region is established, and the temperature field of ordinary roadbed, crushed stone roadbed with EPS insulation layer and heat-insulating laminate composite roadbed is compared and analyzed by using this model. The variation of thawing depth of four kinds of broad embankment is studied. The results show that the subgrade temperature varies periodically with time under different cooling measures, but the average annual temperature increases as a whole, and under the same condition of time and width of roadbed, The thermal stability of the composite subgrade is the lowest and the thermal stability is the best, and the maximum melting depth of the ordinary roadbed in the tenth year increases linearly with the increase of the width of the roadbed. The thawing depth of gravel roadbed increases with the increase of width, and the depth of embankment increases in two stages with the increase of width, while the melt depth of composite roadbed increases gradually with the increase of width, but does not change much, and the single measure of EPS insulation layer, The cooling effect of gravel subgrade is poor for the wide embankment in permafrost region, and the cooling effect of thermal insulation and gravel composite subgrade is the best.
【作者单位】：东南大学交通学院;
【基金】：国家科技支撑计划项目(2014BAG05B04) 教育部霍英东基金资助项目(141076) 东南大学优秀青年教师资助计划项目(2242015R30027)
【分类号】：U416.16

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