路基保温护道对多年冻土地区公路改建的预拓宽效应分析

发布时间：2018-04-16 14:37

本文选题：道路工程 + 预拓宽效应　；参考：《岩石力学与工程学报》2014年S1期

【摘要】：为了研究保温护道对拓宽路基温度场的先期影响,根据青藏公路保温护道试验路观测数据,对冻土地温和冻土上限变化过程进行分析,通过建立拓宽路基有限元模型,在考虑护道对冻土层产生先期影响的基础上,计算路基拓宽对路肩下多年冻土热稳定性的影响。结果表明:阳坡侧的保温护道加速了下伏冻土层的退化,高温冻土区阳坡侧的护道对冻土层的影响大于低温冻土区,阴坡侧护道对冻土层热稳定性影响较小;阳坡侧护道对冻土层产生预融效果,使得阳坡侧路基拓宽后路肩下冻土上限未出现明显下降,产生一种预拓宽的效应,对拓宽路基稳定性有利;阴坡侧护道对路基拓宽热稳定性影响较小,无论先期有无护道,路基拓宽后路肩下冻土上限变化过程无明显差异。
[Abstract]:In order to study the influence of thermal insulation on widening the temperature field of roadbed, according to the observed data of the experimental road of thermal insulation and protection of Qinghai-Tibet Highway, the change process of the upper limit of frozen land and frozen soil is analyzed, and the finite element model of widening roadbed is established.The influence of roadbed widening on the thermal stability of permafrost under road shoulder is calculated on the basis of considering the influence of roadway protection on frozen soil.The results show that the thermal insulation protection on the sunny slope accelerates the degradation of the underlying frozen soil, and the influence of the protective road on the permafrost in the high temperature permafrost is greater than that in the low temperature frozen soil, and the thermal stability of the permafrost is less affected by the side of the shady slope.The effect of pre-thawing on the permafrost is produced by the side of the sunny slope, which makes the upper limit of the frozen soil under the shoulder of the roadbed do not decrease obviously after the widening of the roadbed on the sunny slope, which has a pre-widening effect, which is beneficial to the stability of the roadbed.The overcast slope side retaining road has little effect on the thermal stability of roadbed widening, no matter whether the roadbed is protected or not, there is no obvious difference in the change process of the upper limit of frozen soil under the roadbed shoulder after the roadbed widening.
【作者单位】：中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;中交第一公路勘察设计研究院有限公司;中国科学院大学;
【分类号】：U416.1

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