摘要
基于试验路段省道120线的路面技术状况,利用有限元软件ABAQUS建立旧水泥路面加铺厚沥青层的三维力学分析模型,并考虑了旧路面与加铺层的层间接触和旧路面间接缝.首先计算分析了结构的温度场,然后分析了结构在温度荷载和车辆荷载耦合作用下调平层厚度对结构力学响应的影响及各结构层的功能需求.得出以下结论:在典型高温天气下,面层顶部的温度高于55℃;温度场变化幅度较大的范围在0~30 cm,增加加铺层厚度可降低因旧路面结构引起的温度应力;加铺层承受了较大的竖向变形,上面层和调平层承受较大的拉应力,是路面由上而下开裂和由下向上疲劳开裂的主要原因;上面层承受着较大的压应力和剪应力,同时下面层和调平层也承受了较大的剪应力;增加调平层厚度,可有效降低调平层的拉应力、压应力和剪应力,可以较大降低对旧路面结构的抗拉强度要求,从而增强了结构抗反射裂缝能力和抗疲劳能力;根据力学分析,给出了各加铺层混合料设计建议.研究成果为改善道路材料设计和提高加铺结构耐久性提供力学理论依据.
Based on the pavement technical condition of the test highway S120,a three-dimensional model of the thicker asphalt layers overlaying on the existing concrete cement pavement(CCP)is established by the finite element software ABAQUS,which considers the interlayer contact between the existing CCP and overlay layers and the joints in CCP.First,the temperature field of the structure is calculated and analyzed,and then the influence of the thickness of adjustment layer on the mechanical response of the structure under the coupling action of temperature and traffic load is studied.At last the functional requirements of each structural layer are analyzed.The following conclusions are drawn:under the local typical high temperature,the temperature in the top surface is higher than 55℃,and the temperature field varies greatly between 0~30 cm;increasing the thickness of the overlay layers reduces the temperature stress caused by the existing CCP.The overlay layers are subjected to larger vertical displacement and the upper surface layer and adjustment layer are subjected to larger tensile stress,which is the main causes of Surface-down cracking and Bottom-up fatigue cracking.The upper surface layer is subjected to large compressive and shear stresses,while the lower surface layer and adjustment layer are also subjected to large shear stresses;as the thickness of adjustment layer increases,the tensile,compressive and shear stress of adjustment layer can be effectively reduced,and the required tensile strength of the old CCP structure can be greatly reduced,which enhances the anti-reflective crack ability and anti-fatigue ability of structure;according to the mechanical analysis,the proposals of the Mix Designing of the overlaying layers are given.The research results providing a theoretical basis for improving the design of road materials and improving the durability of overlay structures.
作者
吕惠卿
方一钱
尹应梅
Lyu Hui-qing;Fang Yi-qian;Yin Ying-mei(School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China)
出处
《广东工业大学学报》
CAS
2019年第5期56-62,共7页
Journal of Guangdong University of Technology
基金
国家自然科学基金青年基金资助项目(51508109)
广东省公路管理局项目(粤公研2017-7)
关键词
道路工程
加铺厚沥青层
水泥混凝土路面
力学分析
highway engineering
overlay thick asphalt layer
cement concrete pavement
mechanical analysis
