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

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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。

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关键词 ：道路工程, 预拓宽效应, 保温护道, 数值模拟, 多年冻土

Abstract：In order to study the early stage effects of thermal insulation berm on embankment temperature field of widen embankment，the ground temperature near permafrost table and the change process of permafrost table are analyzed according to observation data of the insulation berm test road along the Qinghai—Tibet highway. A numerical simulation model is established for widen embankment and the early stage effects of insulation berm on permafrost，the thermal stability of permafrost under the shoulder after embankment widening are calculated. Results show that the degradation of permafrost under the berm in sunny slope is accelerated by berm itself，this influence in warm permafrost regions is greater than that in cold permafrost regions and the insulation berm in shady slope has less effect on the thermal stability of permafrost. The pre-melted effect is brought by berm in sunny slope，and the permafrost table under the shoulder does not have significant decrease after embankment widening，which shows as pre-widening effect and it is beneficial to stability of widen embankment. The berm in shady slope has less effect on widen embankment，regardless of whether the insulation berm，the permafrost table change process have less difference after embankment widening.

Key words： road engineering pre-widening effect thermal insulation berm numerical simulation permafrost

收稿日期: 2012-11-28

引用本文:

袁堃1，2，3，章金钊1，2，朱东鹏1，2. 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[J]. 岩石力学与工程学报, 2014, 33(sl): 3263-3269.
YUAN Kun1，2，3，ZHANG Jinzhao1，2，ZHU Dongpeng1，2. ANALYSIS OF PRE-WIDENING EFFECT OF THERMAL INSULATION BERM ON HIGHWAY RECONSTRUCTION IN PERMAFROST REGIONS. , 2014, 33(sl): 3263-3269.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3263

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