Abstract：In order to reveal the influences of structures and types of wide-thick-dark pavement on the temperature field of embankment and pavement system in high-altitude permafrost region, a narrow pavement-embankment test section and a wide pavement-embankment test section were constructed, respectively, in high-temperature permafrost region of Qinghai—Tibet plateau. The temperatures at different depths and horizontal positions for these two types of road structures and the natural ground temperature below the ground surface up to 3.2m were observed continuously and statically analyzed for three years. Results show that: the annual fluctuation amplitude of temperature in asphalt layer of wide road pavement is greater than that of narrow road pavement, and the difference of fluctuation amplitude may decrease with the depth of structural layer of pavement. The new constructed road embankment may experience an initial unstable freeze-thaw period of at least two years. The concurrent increases of solar flux-absorbing area and radiating area may result in more complicated temperature fields at different depths and horizontal positions in the road structure of high embankment and wide pavement. The widening of road pavement from 5m to 24.5m may lead to an increase of 1.5~2m of thawing penetration. Consequently, when designing the height of fill embankment for wide road structure in permafrost region of the middle- or low-latitude but high-altitude areas, the specific cross-sectional characteristics of embankment shall be considered, and during the period from construction stage to stable stage under the extreme weathers, the temperature field in wide pavement-embankment structure shall be calculated to ensure the thawing penetration at the road shoulder at the sunny side may always meet the requirements.
权 磊 田 波 牛开民 李思李. 高海拔多年冻土地区宽幅沥青路面-路基体系#br#
热效应实测分析[J]. 土木工程学报, 2019, 52(3): 111-119.
Quan Lei Tian Bo Niu Kaimin Li Sili. Field observation and analysis on thermal effects of wide asphalt pavement-embankment structure in high-altitude permafrost region. 土木工程学报, 2019, 52(3): 111-119.
