修补模量对沥青混凝土路面坑槽补缝界面力学影响研究

Research on the Effect of Repair Modulus on Asphalt Pavement Potholes Joint Interface Mechanics Behavior

为了研究坑槽修补材料与原路面材料的模量比对补缝界面力学性能的影响,通过Goodman零厚度单元模型,利用ABAQUS软件计算在荷载作用下不同模量比的补缝界面力学指标,分析补缝处力学指标随接触摩擦系数的变化规律。研究表明:补缝界面最大拉应力和最大剪应力计算结果受接触模型类型的影响显著,当摩擦系数μ<0.8时,最大拉应力随模量比的增加呈非线性递增趋势;当模量比ζ≤1.0时,纵缝顶部存在最大拉应力峰值,为0.35 MPa;在模量比为0.5的纵缝顶部和模量比为8.3的补块表面存在最大剪应力峰值,为0.32 MPa。研究成果解释了修补材料与原路面材料模量相容性导致坑槽灾变破损机理,以期为修补材料选择和设计提供参考。

In order to study the pothole repair material with the original pavement material modulus ratio on the joint interface mechanical properties, Goodman element model of zero thickness in nonlinear finite element method is adopted to calculate joint interface mechanics index under different repair modulus ratio by ABAQUS software and to unveil the relationship between the mechanical properties and friction coefficients at the joints. It is shown that joints interface maximum tensile stress and maximum shear stress calculation results are affected by the contact model types significantly, when μ〈0.8, the maximum tensile stress increases nonlinearly with the increase of the modulus ratio; when the ζ≤1.0, the maximum tensile stress peak is 0.35 MPa at the top of longitudinal joint; the maximum shear stress peak value is 0. 32 MPa at the top of longitudinal joint （modulus ratio is 0.5） and pothole surface （modulus ratio is 8.3）. Research results explain the repair material compatibility with the original modulus of pavement materials lead to pothole catastrophe breakage mechanism, so as to provide reference for repairing material selection and design.