CAJ | 학술논문

通过对青藏高原北麓河地区大气降水以及沥青路面和砂砾路面下部浅层土体水热变化的连续监测，分析路面结构中降水、地温以及水分变化之间的关系．结果表明，在降雨时段，5 cm 深度土体水分增加，沥青路面下部土体的水分增量约为砂砾路面的2倍．砂砾路面20 cm 及以下深度范围水分增加，而沥青路面下部水分变化量小于0．3％．砂砾路面下部土体间存在良好的水力联系，沥青路面结构中的隔水层阻隔了层中水热交换．面层中水分的波动与降水密切相关，基层水分变化受地温控制．路面结构的隔水层增加了面层的蒸发量，同时造成层下水分的大量聚集和路基储热量的增加，表现为基层地温明显高于面层．水热交换的差异是造成沥青路面热效应的重要原因之一．
통과대청장고원북록하지구대기강수이급력청로면화사력로면하부천층토체수열변화적련속감측，분석로면결구중강수、지온이급수분변화지간적관계．결과표명，재강우시단，5 cm 심도토체수분증가，력청로면하부토체적수분증량약위사력로면적2배．사력로면20 cm 급이하심도범위수분증가，이력청로면하부수분변화량소우0．3％．사력로면하부토체간존재량호적수력련계，력청로면결구중적격수층조격료층중수열교환．면층중수분적파동여강수밀절상관，기층수분변화수지온공제．로면결구적격수층증가료면층적증발량，동시조성층하수분적대량취집화로기저열량적증가，표현위기층지온명현고우면층．수열교환적차이시조성력청로면열효응적중요원인지일．
By continuously monitoring the precipitation and soil hydro-thermal changes in a shallow part under the asphalt and sand pavement in Beiluhe area on the Qinghai-Tibetan Plateau,the rela-tionships between precipitation,temperature and moisture change in pavement structure are ana-lyzed.The results show that during the rainfall period,the moisture of the soil of 5 cm depth under pavement increases,and the moisture increment in the soil under asphalt pavement is twice over that under sand pavement.In the deeper part of more than 20 cm depth,the moisture of the soil under sand pavement increases,while that under asphalt pavement varies only by less than 0.3%.Under sand pavement,there is a good hydraulic connection between the soil bodies in roadbed.However, in the asphalt pavement structure,the impermeable layer inhibits hydrothermal exchange obviously. Moisture changes are closely related to precipitation in the surface layer and controlled by the ground temperature in the base course.The impermeable layer of the asphalt pavement structure increases the evaporation capacity in the surface layer and causes abundant moisture accumulation under the impermeable layer and the increase of heat storage in roadbed.As a result,the temperature in the base course is significantly higher than that in the surface layer.Therefore,the difference between hydrothermal exchanges is one of the important reasons for asphalt pavement thermal effects.