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为了定量研究斜坡渗流对冻土区公路路基温度场的影响,建立了考虑相变和水分对流传热的冻土导热数值模型,对青藏公路斜坡路基温度场进行了数值模拟,研究了不同土质、不同斜坡坡度水分对流对冻土路基温度场的影响。结果表明:活动层水分渗流对冻土路基的影响主要表现为人为上限下降以及深部冻土的升温,水分渗流对路基下坡脚、路基中心的影响最为显著;浅地表导水系数越高、坡度越大,水分流动对温度场影响越大;对于浅层地表渗透性高(Ks>4×10-7 m·s-1)、含水量接近饱和且坡度较大(>10%)的斜坡路段路基,水分渗流对冻土路基稳定性影响不可忽略。
In order to quantitatively study the influence of slope seepage on the temperature field of highway embankment in permafrost region, a numerical model of thermal conductivity of permafrost considering phase transition and convection heat transfer is established. The temperature field of Qinghai-Tibet Highway slope embankment is numerically simulated, INFLUENCE OF DIFFERENT SLOPE RATIO WATER CONVECTION ON TEMPERATURE FIELD OF FROUTY SOIL SUBGRADE. The results show that the influence of the seepage flow of active layer on the permafrost subgrade is mainly caused by the drop of artificial upper limit and the temperature rise of deep frozen soil. The influence of water seepage on subgrade footing and embankment center is most obvious. The higher the shallow groundwater conductivity coefficient, The greater the influence of water flow on the temperature field, the higher the surface permeability is (Ks> 4 × 10-7 m · s-1), the slope section with saturated water content and large slope (> 10% Subgrade, moisture seepage on the stability of frozen soil subgrade can not be ignored.