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多年冻土地区路基路面稳定性及耐久性与路基底部多年冻土的存在状态密切相关。采用有限元方法,建立多年冻土地区路基与沥青路面结构温度场模型,分析了结构层厚度、结构组合变化对路基顶面温度的影响;利用灰关联方法,以温度稳定性最差的路面结构为参考,分析了不同路面结构间的关联程度。结果表明:增加路面结构层厚度或在路面结构中设置沥青碎石层、级配碎石层,在高温季节可以有效降低路基顶面温度;级配碎石层厚度与路面结构的温度优劣性相关,小于16cm时ACGR、AGR、ACR这3种沥青路面结构较好,大于16cm时ACGR、ACG、AGR这3种结构较好。研究结果可为多年冻土地区半刚性基层开裂处治及沥青路面结构选择提供参考。
The stability and durability of subgrade pavement in permafrost regions are closely related to the existence status of permafrost at the bottom of subgrade. The temperature field model of roadbed and asphalt pavement in permafrost region was established by using finite element method. The influence of structure layer thickness and structure combination on the temperature of roadbed top surface was analyzed. By means of gray relational method, the pavement structure with the worst temperature stability For reference, the correlation between different pavement structures was analyzed. The results show that increasing the thickness of pavement structure or setting asphalt pavement and graded macadam layer in pavement structure can effectively reduce the temperature of subgrade surface during high temperature season. The thickness of pavement grading and the temperature advantage and disadvantage of pavement structure Correlation, ACGR, AGR, ACR less than 16cm when the three kinds of asphalt pavement structure is better, more than 16cm ACGR, ACG, AGR these three structures better. The results can provide reference for the treatment of semi-rigid base cracking in permafrost regions and the selection of asphalt pavement structure.