反射裂缝对路面力学状态影响分析

为了研究反射裂缝对沥青路面力学状态的影响,应用有限元软件ABAQUS建立了含反射裂缝和不含裂缝的路面模型,分析了裂缝出现前后在选取点的应力S11与剪应力S12的变化情况.计算表明:反射裂缝的出现对下面层底部应力S11、剪应力S12产生的影响最大,应力S11增大幅度达到82.96%,剪应力S12由几乎为零增大到43.94kPa;裂缝的出现对路面表面与上面层底部的剪应力S12影响较大,增大幅度分别为46.7%和37%;裂缝的出现对中面层、上基层和下基层底部的应力S11、剪应力S12以及路面表面和上面层底部的应力S11几乎没有影响.

Impact Analysis of Mechanical State for Asphalt Pavement with Reflective Crack

In order to research the influence of reflective crack on the mechanical state for asphalt pave-ment, the finite soft software ABAQUS was used to establish pavement model with reflective crack and without crack, and the changes for stress S 11 and shear stress S 12 of the selected point before and after the cracks ap-peared were analyzed .Calculations show that the emergence of reflective crack has the greatest effect on the stress S11 and the shear stress S12 at the bottom of the lower surface layer , the stress S11 increased by 82.96%, the shear stress S12 increased from almost 0 to 43.94kPa; the appearance of cracks has greater effect on the shear stress S12 of the road surface and the upper surface layer , the rate of increase was 46.7%and 37%;the appearance of cracks has little impact on the stress S 11 and shear stress S 12 at the bottom of middle surface lay-er, upper base and lower base , as well as the stress S11 for road surface and the upper surface layer .