松散性半刚性基层沥青混凝土路面改扩建关键技术研究  

Research on Key Technologies for Reconstruction and Expansion of Loose Semi-Rigid Base Asphalt Concrete Pavement

作　　者：肖冠成 XIAO Guancheng(Guangdong Communication Planning&Design Institute Group Co.,Ltd.,Guangzhou,Guangdong 510440,China)

机构地区：[1]广东省交通规划设计研究院集团股份有限公司,广东广州510440

出　　处：《中外公路》2025年第2期99-105,共7页Journal of China & Foreign Highway

基　　金：广东省科技计划项目(编号:2021B1111610002)。

摘　　要：部分早期建设的半刚性基层沥青路面存在基层严重松散状况,当通过验算无机结合料稳定层疲劳寿命来进行路面结构补强的设计方法行不通,同时该类路面扩宽方案受旧路面使用状况、旧路标高抬升、交通组织、路面再生等因素影响,成为改扩建设计中的重难点。为解决松散性半刚性基层沥青混凝土路面改扩建关键技术难题,该文基于深汕西高速公路改扩建项目,通过理论计算及实践验证的方法对该类路面加铺补强及拼宽技术进行研究。结果表明:结合规范要求及路面检测状况,将松散的水稳基层弱化为碎石粒料层,并将既有松散半刚性基层沥青路面简化为沥青结合料类材料层、粒料基层和路基结构体系进行结构补强验算,可得到满足规范要求的路面结构补强方案;针对旧路面不同设计标高抬升工况,需要综合考虑拼宽侧路面方案、施工便利性、交通组织等因素,制定差异化路面调平方案;路面扩宽方案需要综合考虑项目交通组织、交通分布、路面再生等因素,并通过设置台阶、枕梁、玻纤格栅等措施提高该类松散性基层沥青路面的拼接质量。深汕西改扩建一期工程路面已交工验收2年,目前路面使用状况良好,表明相关路面改扩建技术方案是可行的,相关经验可供类似项目参考。Some early-constructed semi-rigid base asphalt concrete pavements have severe looseness in the base layer,which makes it impractical to evaluate the fatigue life of the inorganic binder-stabilized layer for pavement reinforcement under these conditions.This kind of pavement widening project is affected by the condition of the existing pavement condition,raised elevation,traffic management,pavement regeneration,and other factors.Consequently,such projects pose significant challenges in reconstruction and expansion design.To address the key technical issues in reconstructing and expanding loose semi-rigid base asphalt concrete pavements,this article focused on the Shenzhen‒Shanwei West Expressway reconstruction and expansion project.Pavement overlay strengthening and widening techniques were studied through theoretical calculation and practical validation.The results show that by complying with relevant standards and considering pavement condition,the loose cement-stabilized base layer is treated as an unbound aggregate layer,and loose semi-rigid base asphalt pavement is simplified into a layered system comprising asphalt-bound material layer,an aggregate base layer,and the subgrade.A pavement structure reinforcement solution that meets regulatory standards is obtained.For scenarios involving different raised elevations of the existing pavement,factors such as split-width pavement scheme,construction feasibility,and traffic management are considered to obtain tailored pavement levelling solutions.For widening pavement,factors such as project traffic management,traffic distribution,and pavement regeneration need to be considered,and techniques such as step construction,body bolsters,and glass fiber grilles can be applied to enhance the quality of joints in loose base asphalt pavements.The first-stage project of the Shenzhen‒Shanwei West Expressway reconstruction and expansion was completed two years ago,and the pavement remains in good condition.The results confirm the effectiveness of the proposed pavement reco

关 键 词：松散性半刚性基层 路面改扩建 关键技术 

分 类 号：U416.217[交通运输工程—道路与铁道工程]