旧沥青路面裂缝对沥青加铺层的受力影响分析

Mechanical analysis on bituminous strengthening layer on old asphalt pavement with crack

旧沥青路面裂缝给加铺层的修筑带来很多困难。为此,以裂缝为研究对象,针对当旧路面存在不同层位深度的裂缝时,采用有限元方法对比分析三种沥青加铺层结构组合的受力状况。结果表明当旧路面存在裂缝时,与旧路面直接接触的加铺结构层受力出现从受压到局部受拉的转变;在裂缝贯穿旧沥青路面面层及半刚性基层的情况下,加铺层结构受力大大超出其正常受力范围,可采用LSPM层作为消除与减缓反射裂缝的过渡层。

Cracks of old asphalt pavement causes many problems for construction of bituminous strengthening layer.For cracks,this paper,cracks are created in different depth with the different layers.This paper,with the finite element analysis method,compare or analyzes mechanical status of three bituminous strengthening layers when there are different depth of the crack,The results show that in case of old cracks,direct contact with the old pavement,overlay layer stress changes from compression to tension locally.With the crack through the old asphalt road surface and semi-rigid case,the force of overlay layer structure is well beyond its normal range of force,LSPM layer can be used to eliminate and reduce reflective cracking as the transition layer.