摘要
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 road structure in permafrost areas are closely related with the state of permafrost under subgrade. The temperature field model of subgrade and as- phalt pavement structure in permafrost areas were established based on the finite element meth- od. The influence of structure thickness and forms on subgrade top temperature were analyzed. Taking the worst pavement structure as reference, the associate degree of different pavement structures was analyzed with the gray relational analysis method. The results show that setting the asphalt macadam layer, graded crushed stone layer or increasing the thickness of pavement structure can reduce the subgrade top temperature effectively in high temperature season. The graded crushed stone layer has significant influence on the relative merits of different asphalt pavement structures. When it is less than 16 cm, the ACGR, AGR and ACR asphalt pavement structures have good roadbed temperature stability, while when it is more than 16 cm, the ACGR, ACG and AGR have good roadbed temperature stability. The study results can provide reference for asphalt pavement structure and reduce the semi-rigid base cracking in permafrost areas. 3 tabs, 8 figs, 13 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第6期16-22,32,共8页
Journal of Chang’an University(Natural Science Edition)
基金
交通运输部西部交通建设科技项目(2009 318 000 027)
关键词
道路工程
温度场
数值模拟
灰关联分析
多年冻土
青藏公路
road engineering
temperature field
numerical simulation
gray relational analysis
permafrost
Qinghai-Tibet highway
