摘要
根据能量平衡原理,建立的能够反映冻土温度场变化特征的控制方程。通过对比实测数据与数值计算数据,验证模型的可靠性。利用该模型分析了边坡坡度对温度场的影响。结果表明:随着坡度的减缓,冻土上限有所提高。继续减缓坡度,冻土上限将下降。路堤边坡及坡脚下浅层地温随坡度的变缓而降低,坡度对较低年平均气温的路基温度场影响较小。越是靠近路堤中心线位置,受到路基边坡的影响越大。
Based on the principle of energy balance, established the governing equations which re- flected the changing characteristics of frozen soil temperature field. The model was verified by measured data. Based on this model, the different slope angles influence on temperature field was analyzed. The results show that the permafrost table rises as the slope angle slackens. But with the slope angle contin- ued to slacken, the permafrost table would descends. Lower ground temperature of the embankment slope, the slope foot would reduces, with the gradient of slope slackens. The slope gradient has little in- fluence on the temperature field of roadbed where the annual mean temperature is very low. The nearer approaches the embankment centerline the more influence of embankment slope would suffer.
出处
《公路工程》
北大核心
2014年第3期1-5,共5页
Highway Engineering
基金
国家重点基础研究发展计划(973项目)资助(2012CB026102)
国家自然科学基金项目(41271080)资助
多年冻土区公路建设与养护技术交通行业重点实验室青海研究观测基地开放基金(2012-12-04)
关键词
冻土退化
路基热稳定性
冻土上限
边坡坡率
degradation permafrost
thermal stability
natural permafrost table
slope angle
