Cooling Effect of Crushed Rock Revetment in Permafrost Regions
Cooling Effect of Crushed Rock Revetment in Permafrost Regions
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发表时间：
2007
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通讯作者：
Liu Dong-qing
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作者：
Liu Dong-qing
2003-2005年，在青藏高原北麓河地区的深厚冻土路基上，采用粗粒（7-12 cm）、级配不良的碎石填筑路堤边坡，这应该被称为碎石护岸路堤（CRRE）设计了高透水CRRE，并与常规路堤进行了对比，通过热敏电阻传感器，对试验段的地温进行了监测，通过对CRRE和常规试验段钻孔地温实测数据的分析，结果表明，碎石路基能有效降低坡面年平均气温和年温差，与常规路基相比，可以看出，碎石护坡在夏季具有隔热效果，但在冬季不利于热量散失，根据人工冻土上限的升高和地面的减小，由于温度范围和变形差异较大，碎石护坡的热稳定性优于普通路基，碎石护坡对内部温度场的调节是一个长期的过程，在青藏铁路应用时应慎重。
During the year of 2003-2005,an experimental embankment was constructed in Beiluhe of the Tibetan Plateau,using the fill material of coarse(7-12 cm) and poorly graded crushed rock on the slopes of embankment on the permafrost foundation with thick ground ice,which should be called the crushed rock revetment embankment(CRRE).The highly permeable CRRE was designed to test the cooling effect of CRRE as compared with conventional embankment.By means of thermistor sensors,ground temperatures in the test sections were monitored.Analyzing the ground temperature data measured in the boreholes within the CRRE and conventional embankments,it is found that crushed rock can effectively reduce annual mean temperature and annual range of temperature on slope surfaces.Comparing with the conventional embankment,one can see that the crushed rock revetment has the effect of heat insulation in summer but is disadvantageous to heat losing in winter.According to the rising of artificial permafrost table and the decreasing of ground temperature range and difference of deformation,the heat stability of CRRE is more than that of the conventional embankment.It will be a long term process for crushed rock revetment to adjust the interior temperature field,so it should be cautious when using the measure in the Qinghai-Tibet Railway.