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为量化研究沥青混合料受荷载时应力分布规律,借助有限元法建立二维非均质沥青混合料劈裂试验模型,赋予非均质模型材料属性,模拟劈裂试验的受力状态。为测定模型内部应力值,布置沿模型圆心水平方向位置上的5条应力测定线,准确得到各测点的应力值,分析各测线上最大主应力的变化规律,研究沥青混合料劈裂试验后的损伤规律。结果表明:圆心区域的应力值大于周边区域,圆心区域应力值使得该区域沥青混合料受拉开裂,裂纹向外延伸,该情形符合实际劈裂试验的破坏形式;并且在圆心水平方向的上下两部分模型区域应力值对称分布。
In order to quantitatively study the stress distribution of asphalt mixture under load, a two-dimensional heterogeneous asphalt mixture splitting test model was established by means of finite element method, and the material properties of the heterogeneous model were simulated to simulate the stress state of the splitting test. In order to determine the internal stress of the model, five stress measurement lines along the horizontal direction of the model center were arranged to obtain the stress values of each measurement point accurately. The variation rule of the maximum principal stress on each line was analyzed. After the injury rules. The results show that the stress in the central area is larger than that in the surrounding area, and the stress in the central area makes the asphalt mixture cracked and cracked in the area, which is in accordance with the failure mode of the actual splitting test. Symmetrical distribution of stress values in some model regions.