级配碎石本构模型弹性变形适用性及验证

Applicability and Verification of Unbound Granular Material Elastic Deformation Constitutive Model

摘要:

针对级配碎石本构模型对沥青路面变形适用性，推导应变张量更新算法并对碎石本构模型进行有限元二次开发，将其用于ABAQUS有限元软件分析路面变形，并将分析结果与现场实测结果对比.结果表明：级配碎石计算收敛模量分布极不均匀；级配碎石采用Uzan模型计算得沥青层层底应力、应变与沥青层内部最大剪应力均较其采用线弹性模型和kθ模型的情况大；通过与现场实测应变比较可知，采用Uzan模型计算所得沥青层层底应变与实测应变最接近.

Abstract:

In order to investigate the applicability of constitutive model to unbound granular material (UGM) base asphalt pavement, strain tensor update algorithm and finite element program of UGM constitutive model were developed and applied to ABAQUS finite element software, and the calculated results were compared with the measured ones in the field. The results show that the calculated convergence modulus distribution of UGM is extremely nonuniform. The calculated bottom strain or stress or the maximum shear stress within the asphalt layer with Uzan model is bigger than the calculated ones with linear elastic or kθ UGM models. The calculated bottom strain of asphalt layer with the Uzan UGM model is the closest with measured value by comparing with the measurements in the field.