榆林地区风积沙路基的冻结深度实测分析
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摘要
为了研究严寒地区风积沙路基在冬季低温时的冻结深度,依托陕西省榆林市境内穿越风积沙地区的国道210陕蒙段和省道204榆靖段的改扩建工程,在路基路面的施工过程中现场埋设了温度传感器,在冬季最寒冷时段实测了道路结构的温度,分析了两个路段的低温温度场,确定了道路结构的冻结深度。研究结果表明:冬季低温时,陕西榆林风积沙地区的道路温度在路面结构内变化较大,在路基范围内变化较小,且冻结深度可达70～82cm;路面结构的最大温度梯度出现在路表下40cm内,需要特别强调低温抗裂设计;总体上,随着道路深度增加,道路温度在油面层和基层范围内快速升高,随后的变化幅度变缓。
In order to study the frozen depth of aeolian sand subgrade during the low temperature period of winter in severe cold area,relying on the reconstruction and extension project of G210 national highway and S204 provincial highway through the aeolian sand area in Yulin City,Shaanxi Province,road structure temperature in the coldest period of winter is measured using the temperature sensors embedded in the road structure of above two highways,the low-temperature field of two highways is analyzed,and the frozen depth of road structure is determined.The results show that,during the low temperature period of winter,the road temperature changes significantly in pavement structure and little in subgrade structure in the aeolian sand region of Yulin City,Shaanxi Province,and the frozen depth can reach 70～82 cm.The maximum temperature gradient of pavement structure occurs within 40 cm depth under the road surface,thus the low-temperature anti-cracking design needs to be specially emphasized.In general,as the road depth increases,the road temperature increases rapidly in the surface course and base course,and the subsequent change range becomes slow.
In order to study the frozen depth of aeolian sand subgrade during the low temperature period of winter in severe cold area,relying on the reconstruction and extension project of G210 national highway and S204 provincial highway through the aeolian sand area in Yulin City,Shaanxi Province,road structure temperature in the coldest period of winter is measured using the temperature sensors embedded in the road structure of above two highways,the low-temperature field of two highways is analyzed,and the frozen depth of road structure is determined.The results show that,during the low temperature period of winter,the road temperature changes significantly in pavement structure and little in subgrade structure in the aeolian sand region of Yulin City,Shaanxi Province,and the frozen depth can reach 70～82 cm.The maximum temperature gradient of pavement structure occurs within 40 cm depth under the road surface,thus the low-temperature anti-cracking design needs to be specially emphasized.In general,as the road depth increases,the road temperature increases rapidly in the surface course and base course,and the subsequent change range becomes slow.
引文
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[3]胡小圆.沥青路面温度场的测试与分析[D].西安:长安大学,2011.
[4]白伟.沥青路面传热性能的试验分析研究[D].西安:长安大学,2012.
[5]延西利,张世平,白伟,等.沥青路面温度场的热量分析研究[J].公路交通科技,2014,31(8):7-12.
[6]延西利,艾涛,游庆龙,等.半刚性基层沥青路面的热传导试验特性[J].长安大学学报:自然科学版,2016,36(5):1-7.
[7]延西利,张世平,李艳,等.沥青路面温度场的全厚式实测分析[J].长安大学学报:自然科学版,2016,36(1):1-7.
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[9]吴建良,孙立军.路面非周期一维温度场的傅里叶级数解[J].中国公路学报,2012,25(1):29-34.
[10]徐慧宁,张锐,谭忆秋,等.季节性冰冻地区冬季路面温度分布规律[J].中国公路学报,2013,26(2):7-14.