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通过有限元仿真(ANSYS),首先分析了不同高度路堤顶部沉降形态(选取填土高度分别为1.6和5.0m这2种实际工程),然后计算出基于路基沉降形态的沥青路面受力情况,并与常用简化沉降形态下的情况进行对比.结果表明:a.实际沉降形态下低路堤顶部呈现“勺”形沉降,其路面结构除了在拼接处顶面(“勺”形曲线凸部)承受附加拉应力外,其新建路面部分的基层底部(“勺”形曲线凹部)存在较大反弯拉应力,底基层可能先于面层开裂;b.高路堤主要受面层顶面拼接处拉应力控制,其反弯拉应力不明显.简化沉降形态不能准确反映路面结构的破坏层和破坏点.
Through the finite element simulation (ANSYS), the settlement patterns of the top of embankments at different heights (the two kinds of actual projects whose filling heights are 1.6 and 5.0 m respectively) are analyzed first, and then the stress of asphalt pavement based on the subsidence patterns of subgrade is calculated The results show that: a. In the actual subsidence pattern, the top of the low embankment shows a “spoon-shaped” settlement, the road surface structure except at the top of the splice (“spoon-shaped” curve convex Ministry of the new road surface of the grassroots ( “spoon ” -shaped curve concave) there is a large anti-bending tensile stress, the base layer may be prior to the surface cracking; b. High embankment mainly by the surface layer Tensile stress is controlled at the top splicing joint, and the tensile stress in reverse bending is not obvious, and the simplified settlement pattern can not accurately reflect the failure layer and failure point of pavement structure.