温度梯度下水泥混凝土路面接缝张开量数值分析

Numerical Analysis of Joint Opening Displacement for Cement Concrete Pavement under Temperature Gradient

为了分析水泥混凝土路面在不同结构组合和材料参数下的接缝张开量变化情况,通过三维有限元数值方法,建立接缝模型,量化分析了各因素对接缝张开量的影响,表明温度梯度、基层模量、面板长度以及面板厚度对接缝张开量的影响显著,接缝张开量与温度梯度呈对数关系,与基层模量呈乘幂关系,与面板长度和面板厚度呈指数关系.基于前述分析,回归出综合考虑4因素的接缝张开量模型公式,并利用实测数据对其进行修正,从而为水泥混凝土路面接缝设计和填缝料选用提供参考依据.

In order to analyze the changes of joint opening displacement（JOD） of cement concrete pavement under different road structures and material parameters,the joint model was established by using a 3D finite element method.Various factors of JOD were quantitatively analyzed.The results show that JOD is significantly effected by temperature gradient,base modulus,slab length and slab thickness,and the relationship between JOD and temperature gradient is the logarithmic,the base modulus is the power,and both the slab length and thickness are the exponential.Based on the above analysis,the formulae of joint changes have been set up with the consideration of four main factors,the theoretical analysis is verified by using the measured data,and the results provide the potential for the joint design and selecting the joint filler.