【摘要】 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。更多还原

【Abstract】 In order to determine the distribution characteristics of road foundation temperature field and humidity field in the Qinghai-Tibet plateau Qarham Salt Lake area,based on the new national road G3011 of Da-Chaidam to Golmud expressway,through filed monitoring and indoor experiments,the paper analyzed the distribution characteristics of temperature field and humidity field of road foundation with the variation of depth and seasons.The results show that the upper embankment changes the heat exchange between the foundation and atmosphere environment,the influence of atmosphere environment is getting smaller near road center.Temperature gradient is getting smaller with the increase of foundation depth with season changing.The results also manifest that the foundation absorbs heat during May to August,but releases heat from August to December.The inflection point of foundation temperature is at 2.5m depth under the earth’s surface.The paper determines the annual mean ground temperature and its depth under different positions of the road,which are basically not influenced by the height of subgrade and its coverage.The humidity variation depth is 1.5~2.0 m under the change of seasons(air temperature,precipitation,etc.).Below this depth,the moisture content of foundation soil is basically affected by groundwater,while affected little by seasons changing.更多还原