察尔汗盐湖公路地基温度场与湿度场分布特征

发布时间：2018-03-26 17:47

本文选题：青藏高原察尔汗盐湖区　切入点：公路地基　出处：《地下空间与工程学报》2017年03期

【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。
[Abstract]:In order to find out the distribution characteristics of temperature field and humidity field of highway foundation in Chaerhan Salt Lake area, Qinghai-Tibet Plateau, based on the newly built Great Chaidan-Qarhan Golmud Expressway of G3011 Line, the field monitoring and indoor test were adopted. The variation characteristics of temperature field, humidity field with depth and seasonal change of highway foundation are analyzed. The results show that the upper subgrade changes the thermal exchange environment between the ground and the atmosphere, and the closer the road center is, the less the temperature is affected by the atmospheric environment. The ground of the same monitoring hole shows that the geothermal gradient decreases with the increase of depth with the change of seasons. August is the endothermic stage of the foundation and December is the exothermic stage of the foundation. The inflection point of the variation of the ground temperature with depth is at the depth of 2.5 m below the original surface. The annual variation depth and the annual average ground temperature of the highway ground temperature are proved; the annual average ground temperature is basically independent of the subgrade height and its coverage; the seasonal variation (temperature, temperature, temperature, temperature, temperature, etc.). The effective influence depth on the soil moisture field is 1.5 ~ 2.0 m, and below the effective influence depth, the soil moisture content changes little with the change of season, and is mainly affected by groundwater migration.
【作者单位】：长安大学公路学院;中交第一公路勘察设计研究院有限公司;
【基金】：中国交通建设股份有限公司、中国交建寒区旱区道路工程重点实验室、中交第一公路勘察设计研究院有限公司资助科研项目(2014-ZJKJ-PTJC07)
【分类号】：U416.1

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