软土地基上高速公路沥青路面结构设计

Asphalt pavement structure design of expressway on soft-soil foundation

在软土地基上修筑高速公路会产生不均匀沉降,不均匀沉降在沥青路面结构内部又会产生较大的附加应力,从而加速沥青路面的破坏。因此,在软基上修筑道路,必须选择合理的路面结构,从而降低不均匀沉降对面层结构的影响。基于ABAQUS有限元计算方法可知在沥青面层结构下设置级配碎石夹层结构可以有效地降低应力控制层层底水平附加应力,并具有较好的防止反射裂缝的作用,对于在软土地基上修筑沥青路面结构有着一定的参考价值。

Non-homogenous settlement will occur while the expressway is constructed on soft ground. The differential settlement can cause the bigger additional stress inside the asphalt pavement structure accelerating bituminous pavement destruction. Therefore, we must choose reasonable pavement structure when constructing road on sol{ base in order to reduce the influence on surface layer structure from the differential settlement. Based on ABAQUS finite element method and through analysis, this article draws the conclusion that establishing unbound graded aggregate sandwich structure under the asphalt pavement structure can effectively reduce the horizontal additional stress of the stress-controled layer and better prevent crack reflection which is beneficial for constructing the asphalt pavement structure on the soft ground.