Modification of Japanese Pavement Fatigue Life Criteria by Considering Climatic Effects in Cold Regions
Modification of Japanese Pavement Fatigue Life Criteria by Considering Climatic Effects in Cold Regions
复制标题
考虑寒冷地区气候影响的日本路面疲劳寿命标准的修改
DOI：
10.1007/978-3-030-77230-7_3
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Ueno Chigusa
中科院分区：
文献类型：
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作者：
Lin Tianshu;Ishikawa Tatsuya;Tokoro Tetsuya;Maruyama Kimio;Ueno Chigusa
在日本的路面设计方法中，开裂和车辙的疲劳寿命标准来自美国沥青协会模型，该模型将破坏荷载数分别与沥青混合料层下表面的拉应变和路基顶层的压应变相关联。这些应变与各层的模量密切相关。日本的路面设计方法假定基层和路基层的模量全年保持不变。然而，正如许多过去的研究所证明的，这些模量强烈地受含水量和冻融循环的变化的影响。准确地说，由于水的流入或冰透镜体的融化，含水量上升，导致路基和基层材料的刚度暂时降低。此外，冰的形成往往会破坏一些颗粒接触和土壤颗粒的互锁，这也导致基层材料的降解。基本上，目前日本的路面设计方法没有充分考虑气候对基层和路基层材料的影响（含水量和冻融循环的变化）。本研究计算了8个当地柔性路面项目的疲劳寿命，考虑冻融作用和季节性含水量波动的基层模量的变化，以捕捉气候对路面疲劳寿命的影响。长期实测的性能数据被用来校准车辙模型。结果表明，气候相关的粒料基层的退化降低了寒冷地区沥青路面的抗车辙疲劳寿命。
In Japanese pavement design method, fatigue life criteria for cracking and rutting come from the US Asphalt Institute model, which relates failure loading number to the tensile strain on the lower surface of the asphalt mixture layer and the compressive strain on the top layer of the subgrade, respectively. These strains closely relate to the moduli of each layer. Japanese pavement design method assumes the moduli of base and subgrade layers are constant throughout the whole year. However, as proven by numerous past studies, these moduli are strongly affected by variation of water content and freeze-thaw cycle. To be precise, rising water content, as a result of the inflow of water or the thawing of ice lenses, causes a temporary decrease in the stiffness of subgrade and base course material. Besides, ice formation tends to break some of the particle contacts and interlocking of soil particles, which also leads to a degradation of base course material. Basically, climatic effects (variation of water content and freeze-thaw cycle) on base and subgrade layers material are not fully captured in Japanese pavement design method now. This study calculates the fatigue life of eight local flexible pavement projects with variation of base layer moduli considering freeze-thaw action and seasonal fluctuation in water content to capture the effects of climate on the fatigue life of the pavement. Long-term measured performance data are used to calibrate the rutting model. Results proved that climate-related degradation of the granular base decreases the fatigue life against rutting of asphalt pavements in cold regions.