空隙结构对沥青混合料内部受力状态的影响

发布时间：2018-06-11 12:00

本文选题：道路工程 + 沥青混合料　；参考：《公路交通科技》2015年03期

【摘要】：利用ANSYS和蒙特卡罗方法,建立含有不同空隙结构的沥青混合料模型,施加0.7 MPa的竖向荷载后,提取应力应变值,进而研究空隙结构(包括形状、大小、空隙率)的差异对沥青混合料内部受力状态的影响。研究结果表明:X向拉压应变、Y向拉压应变最大值及X向压应力均随空隙边数的减少线性降低,Y向压应力最大值减小更加明显;空隙边缘路径上X应力极大值均出现在空隙的角点,Y向应力在角点处发生突变,最大值可达2.22 MPa,均值为0.59 MPa,尖锐处为易损伤区域;随着空隙变大,应力、应变基本呈增大趋势;空隙率的改变对X向应力与剪应力影响较大,且空隙率一旦超过10%,X向应力与剪应力急剧增大,之后趋于稳定。
[Abstract]:Using ANSYS and Monte Carlo method, the asphalt mixture model with different voids was established. After applying 0.7 MPA vertical load, the stress and strain values were extracted, and then the void structure (including shape, size and size) was studied. The influence of the difference of void ratio on the internal stress state of asphalt mixture. The results show that the maximum value of tensile and compressive strain in Y direction and the maximum value of compressive stress in Y direction decrease linearly with the decrease of voids. The maximum of X stress on the edge path of the voids appears at the corner of the voids. The maximum value can reach 2.22 MPA, the mean value is 0.59 MPA, and the sharp region is prone to damage, and the stress and strain basically increase with the increase of the voids, and the maximum value of the X-stress changes at the corner point of the voids, and the maximum value can reach 2.22 MPA, the mean value is 0.59 MPA, and the stress increases with the gap. The change of voidage ratio has a great influence on the X-direction stress and shear stress, and once the voidage ratio exceeds 10%, the X-direction stress and shear stress increase sharply, and then tend to stabilize.
【作者单位】：山西交通技师学院;长安大学材料科学与工程学院;长安大学特殊地区公路工程教育部重点实验室;陕西神木职教中心;
【基金】：国家自然科学基金项目(51408047)
【分类号】：U414

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