摊铺式碾压混凝土结构方案设计研究  

Research on the Design of Paved Roller Compacted Concrete Structure Scheme

作　　者：曾鹏 刘敏 邱志雄 ZENG Peng;LIU Min;QIU Zhixiong(Guangdong Provincial Expressway Development Co.,Ltd.,Guangzhou Guangdong 510623,China)

机构地区：[1]广东省高速公路有限公司,广东广州510623

出　　处：《广东公路交通》2024年第5期17-22,共6页Guangdong Highway Communications

基　　金：广东省科技厅计划项目“高速公路改扩建工程快速安全建设关键技术研究”(2021B1111610002)。

摘　　要：为提高白加黑路面拼接结构设计均衡性,防止拼接位置出现反射裂缝,采用FWD落锤弯沉仪获取旧路面技术状况,通过模量反算得到旧水泥混凝土板模量,然后根据室内试验得出3种不同路面结构模量水平,基于模量均衡设计原则优选出碾压混凝土结构。通过ABAQUS有限元建立模型,并验证了模型的精确性。考虑施工过程中摊铺方式对于拉杆的影响,通过有限元模拟实际施工情况,开展拉杆设置参数的研究,结果表明,当拉杆伸入旧水泥板的深度为20cm,拉杆距离旧水泥板的底部的高度为10~12cm,拉杆预留在碾压混凝土板中的长度为50~60cm时,拉杆植筋效果最优。在植筋胶的质量指标方面,应控制植筋胶的破坏剪力不低于51kN。Research was operated to improve the balance in the splicing structural design of the existing cement concrete pavement ovelaid with a new layer of asphalt topping(white plus black road surface),and prevent reflection cracks at the splicing position.Using the FWD drop weight deflection instrument to obtain the technical condition of the old cement concrete pavement road surface,the modulus of the old cement concrete slab were obtained through modulus backcalculation.Then,three different levels of pavement structure modulus were obtained based on indoor experiments,and the roller compacted concrete structure was optimized based on the principle of modulus equilibrium design.A model was established using ABAQUS finite element method and its accuracy was verified.Considering the impact of paving methods on the connecting rods during the construction process,finite element simulation of actual construction conditions was carried out to study the setting parameters of the connecting rods.The results showed that the optimal effects of connecting rods insertion and bonded rebars were achieved when the depth of the connecting rods extending into the old cement board was 20cm,the distance from the connecting rods to the bottom of the old cement board was 10~12cm,and the length of the connecting rods reserved in the roller compacted concrete board was 50~60cm.In terms of the quality indicators of the bonded rebars adhesive,the failure shear force of the bonded rebars adhesive should be controlled to not be less than 51kN.

关 键 词：白加黑路面 模量 碾压混凝土 拉杆设置参数 

分 类 号：U416.222[交通运输工程—道路与铁道工程]