道路扩建工程中路堤拼接部力学特性研究

Mechanical Characteristics of Joint Part of Embankment in Road Extension Project

道路扩建工程中加宽路堤的填筑将会改变原有路基、路面的应力场和应变场,引起新旧路堤拼接部产生不均匀塑性累积变形和附加应力。文中研究了道路扩建工程中路堤拼接部力学特性。结果表明,道路加宽后路面最大剪应力出现在新旧路堤拼缝旧路侧1m左右的位置,最大横向拉应力出现在路堤中线位置。剪应力相对拉应力较小,应加强拼缝处的抗拉性能。道路加宽宽度越大,对地基和路堤的沉降影响越不利。道路扩建工程须重视拼接部位地基和路堤不均匀沉降及其引发的病害,并采取适当的措施予以解决。

Road extension engineering of widening embankment filling will change the original roadbed,road surface of the stress field and strain field and lead to non-uniform cumulative plastic deformation and additional stress in the old and new embankment splicing.In this paper,the road embankment splicing in expansion project of mechanical properties was studied.Maximum shear stress analysis results show that after the road widening,the maximum shear stress of the pavement appears in the position of the old and new embankment flat-fell seam and is one meter or so on the side of the old side outline and the largest transverse tensile stress appears in the embankment line position.Tensile stress in the shear stress is relatively small and the flat-fell seam should be strengthened in tensile properties.With the widening of road width,there are more adverse effects on the foundation and the settlement of embankment.In road extension project it must pay attention to the uneven settlement of the foundation and embankment of the splice site and the diseases caused by the uneven settlement of the embankment,and take appropriate measures to solve them.