基于水-热-力耦合作用的冻土区CRCP路面应力特性  

Stress characteristics of CRCP pavement in permafrost region based on coupled interaction of moisture-heat-stress fields

作　　者：田荣燕 黄晓明[1] 殷大泉[1] 郑彬双 Tian Rongyan;Huang Xiaoming;Yin Daquan;Zheng Binshuang(School of Transportation,Southeast University,Nanjing 211189,China;College of Engineering,Tibet University,Lhasa 850000,China)

机构地区：[1]东南大学交通学院,南京211189 [2]西藏大学工学院,拉萨850000

出　　处：《东南大学学报（自然科学版）》2020年第2期286-293,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51778139);西藏自治区科技厅重点研发及转化计划资助项目(XZ201901-GB-14);江苏省研究生科研与实践创新计划资助项目(KYCX18_0146).

摘　　要：为了研究多年冻土区地基融沉效应对路面结构应力状态的影响,基于水-热-力耦合作用理论,利用COMSOL有限元软件建立了冻土区连续配筋混凝土路面(CRCP)有限元模型,研究了基层与底基层材料参数、面板厚度与模量、配筋率对CRCP路面结构组合应力的影响,提出了适用于多年冻土区CRCP路面的合理结构形式.结果表明,地基融沉效应对于CRCP路面结构应力影响显著.融沉效应和车辆荷载耦合作用下,板内最大主应力随时间推移逐渐变大.板内最大主应力随面板、基层和底基层的厚度增加而减小,随各层模量的增加而增大,但配筋率的变化对其无影响.考虑融沉效应时,CRCP路面板+水泥稳定碎石+石灰土的路面结构较适宜于多年冻土区,可为多年冻土地区CRCP路面结构设计提供参考.To study the effects of the foundation thaw settlement on the stress state of the pavement structure in the permafrost region, a finite element model of continuous reinforced concrete pavement(CRCP) in the permafrost region was established by the finite element software COMSOL based on the coupled interaction theory of moisture-heat-stress fields. The effects of the material parameters of the base and the subbase, the concrete slab thickness and modulus as well as the reinforcement ratio on the combination stress of CRCP pavement were investigated. The reasonable structural forms of CRCP pavement in the permafrost region were proposed. The results show that the thaw settlement effect of the foundation on the stress characteristics of CRCP pavement structure is significant. With the coupled interaction of thawing settlement and vehicle loads, the maximum principal stress of the pavement slab gradually increases with time. The maximum principal stress of the pavement slab decreases with the increases of the thickness of the slab, the base and the subbase, and increases with the increase of the modulus of each structure layer, while the reinforcement ratio has little effect on the stress. Considering the thaw settlement effects, the pavement structure of CRCP slab+cement stabilized macadam+lime soil is suitable for the permafrost region, providing a reference for the design of the CRCP pavement structure in the permafrost region.

关 键 词：多年冻土区 多物理场耦合 CRCP路面 融沉效应 路面应力特性 

分 类 号：TU528.1[建筑科学—建筑技术科学]