旧水泥混凝土路面错台对沥青加铺层产生反射裂缝的影响分析

针对某旧水泥混凝土路面改造工程中,沥青加铺层中出现严重反射裂缝的问题,利用有限元软件ANSYS建立了考虑错台的三维线弹性路面结构有限元模型,分析了施工阶段压路机荷载和运营阶段标准轴载下、荷载作用位置、沥青加铺层厚度和水泥路面板错台高度等因素对沥青加铺层中最大剪应力分布规律的影响。计算结果表明,沥青加铺层中的最大剪应力是反射裂缝产生的原因,荷载作用下,错台显著地加剧了沥青加铺层中最大剪应力的集中程度。得到错台条件下的最不利荷位为荷载刚好完全作用在错台高板一侧,并给出了临界错台高度及临界加铺层厚度。最后指出施工中应重视错台的危害,轻微错台也要严格消除,并提出了进一步的研究方向。

Analysis on Reflection Crack of Faulting in AC Overlay over Deteriorated Concrete Pavement

A three dimensional finite element model considering faulting was developed with ANSYS aiming at long reflection crack in AC overlay happened along joints in the deteriorated concrete pavement in a reconstructed project.The influence of faulting height,load sizes(roller load in construction and traffic load in service),load locations and thickness of overlay on maximum shear stress distribution in AC overlay over the deteriorated concrete pavement were analyzed.It is concluded that,the maximum shearing stress in the AC overlay is the reason for the reflection crack,and faulting could increase the maximum shearing stress remarkably.The worst load location is where the higher slab exactly subjected to load and the critical faulting height and thickness of AC overlay were presented.In the end,the special construction suggestion that the tiny faulting should also be eliminated was presented and the next research work was indicated.