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为探明青藏高原察尔汗盐湖区公路地基温度场与湿度场的分布特征,以新建的G3011线大柴旦—察尔汗—格尔木高速公路为依托工程,通过现场监测和室内试验等手段,分析了公路地基温度场、湿度场随深度、季节更替的变化特征。结果表明:上部路基改变了地基与大气之间的热力交换环境,离路中心越近,温度受大气环境的影响越小;同一监测孔地基随季节更替呈现出地温梯度随深度的增加而减小;5~8月份为地基吸热阶段,8~12月份为地基放热阶段;地温随深度变化的拐点位于原地表下2.5 m深度处。探明了公路地温的年变化深度和年平均地温;年平均地温基本上不受路基高度及其覆盖作用的影响;季节的变化(气温、降水等)对地基湿度场的有效影响深度为1.5~2.0 m;有效影响深度以下,地基土含水率随季节更替变化不大,主要受地下水迁变的影响。
In order to find out the distribution characteristics of temperature and humidity fields in the highway foundation of Chaer Khan Salt Lake in the Qinghai-Tibet Plateau, based on the newly constructed Dachaidan-Chaerhan-Golmud expressway of G3011, through on-site monitoring and laboratory tests, The road base temperature and humidity fields with depth, seasonal changes in the changing characteristics. The results show that the upper subgrade changes the heat exchange environment between the ground and the atmosphere, and the closer to the center of the road, the smaller the influence of temperature on the atmospheric environment. The geothermal gradient of the same monitoring hole changes with the decreasing of the depth as the seasons change From May to August, it is the endothermic period of the foundation and from August to December is the exothermic stage of the foundation. The inflection point of the ground temperature with depth is located at a depth of 2.5 m below the original surface. The annual variation of annual ground temperature and annual mean ground temperature were ascertained. The average annual ground temperature was basically not affected by the subgrade height and its coverage. The seasonal variation (temperature, precipitation, etc.) had an effective influence on the soil moisture field of 1.5 ~ 2.0 m; below the effective depth, the change of soil moisture content with seasons did not change much, mainly due to the change of groundwater.