考虑正交异性的粒料压实特性及其结构力学行为研究
Compaction Characteristics of Granular Material and its Structural Mechanical Behavior Considering Orthotropy
黄优 1张允宝 2刘朝晖 3潘宇 3刘泽斌 3方荣海3
作者信息
- 1. 长沙理工大学 道路灾变防治及交通安全教育部工程研究中心,湖南 长沙 410114;长沙理工大学 交通运输工程学院,湖南 长沙 410114
- 2. 湖南省交通运输厅 交通建设造价管理站,湖南 长沙 410011
- 3. 长沙理工大学 交通运输工程学院,湖南 长沙 410114
- 折叠
摘要
粒料的正交异性与其压实过程密切相关,对路面的结构力学行为具有显著影响.为研究压实过程对粒料正交异性的影响,采用不同的压实方式及压实功对路用粒料进行击实成型,开展改进的动态回弹力学试验研究,得到典型粒料的正交异性系数α2;采用有限元方法,开展考虑粒料正交异性的沥青路面结构力学分析.结果表明:对于旋转压实成型的试件,其干密度略大于冲击压实成型;增大压实功,在增加粒料干密度的同时也会增加其正交异性;在低压实功下,旋转压实成型的粒料正交异性更显著,但在高压实功下,冲击压实成型的正交异性更加显著;粒料的正交异性对沥青路面结构关键响应具有显著影响,忽略粒料的正交异性,存在低估路面结构损坏的风险;考虑粒料的正交异性,能够改善路面结构计算中粒料层的底部受拉,且更符合实际情况.
Abstract
The orthotropy of granular materials is closely related to the compaction process and has a significant impact on the mechanical behavior of pavement structures.In this study,in order to study the effect of the compaction process on the orthotropy of granular materials,different compaction methods and compaction energies were employed to compact granular materials for pavement into specimens,and improved dynamic resilient mechanical tests were conducted.Orthotropic coefficients(α2)of typical granular materials were obtained,and the finite element method was used to conduct mechanical analysis of asphalt pavement structures considering the orthotropy of granular materials.The results show that the dry density of specimens by gyratory compaction is slightly higher than that of specimens by impact compaction.Increasing compaction energy will increase the dry density and orthotropy of granular materials.Under low compaction energy,the orthotropy of granular materials by gyratory compaction is more significant,while under high compaction energy,the orthotropy of granular materials by impact compaction is more significant.The orthotropy of granular materials has a significant impact on the critical responses of asphalt pavement structures.Ignoring the orthotropy of granular materials will underestimate the risk of pavement structure damage.Moreover,considering the orthotropy of granular materials in pavement structure calculation can improve the tensile stress at the bottom of the granular material base and better reflect the actual situation.
关键词
道路工程/粒料/正交异性/压实功/路面结构响应Key words
road engineering/granular material/orthotropy/compaction energy/pavement structure response引用本文复制引用
基金项目
国家自然科学基金资助项目(52008044)
湖南省交通运输厅科技创新计划项目(202236)
长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(kfj210401)
出版年
2024
国家科技期刊平台
NSTL
万方数据