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实际情况中,由于受到试验条件、试样制备和道路受力复杂性的限制,试验方法不能全面的表示开裂过程,因而数值模拟方法在道路工程中得到越来越广泛的应用。本文采用Ortiz和Pandofi(1999)给出的粘聚力本构模型对ABAQUS中非线性粘聚本构模型进行标定,确定出相应参数,并对I型加载模式下半圆弯曲进行扩展有限元模拟分析,同时,为了研究混合料的的非均匀性对开裂行为的影响,采用了单一骨料模型进行数值计算,将2种模型结果与试验结果进行了对比,说明了扩展有限元方法和参数取值的有效性。
In practice, due to the limitation of the test conditions, sample preparation and the complexity of the road, the test method can not fully represent the cracking process, so the numerical simulation method is more and more widely used in road engineering. In this paper, the constitutive model of cohesive force given by Ortiz and Pandofi (1999) is used to calibrate the nonlinear cohesive constitutive model in ABAQUS, the corresponding parameters are determined, and the semi-circular bending in I-mode is expanded by finite element analysis Meanwhile, in order to study the influence of the heterogeneity of the mixture on the cracking behavior, a single aggregate model was used to calculate the numerical results. The results of the two models were contrasted with the experimental results, which showed that the extended finite element method and the parameter values Effectiveness.