Analysis of Mechanical Characteristics of Mountain Highway Section Surface Structure Based on Load

Zhang Zhigang,Wang Yue,Wang Wei,Qiao Jiangang

doi:10.11648/j.sd.20210905.14

Abstract

Mountain roads have many kinds of diseases due to their special natural and geographical conditions, and it is difficult to maintain the road surface, so it is particularly important to analyze the causes of the diseases from the theoretical aspect, in order to explore the relationship between structural mechanical characteristics and load of mountain highway pavement, the finite element simulation method was used to study the compressive stress, structural layer displacement, compressive strain, transverse shear stress, longitudinal shear stress, and longitudinal shear of different pavement structure layer depths under load. Change trend of strain. The results show that the compressive stress, longitudinal shear stress, and transverse shear stress are mainly concentrated in the surface layer and have a relatively large impact on the surface layer; the displacement value, compressive strain, and longitudinal shear strain are larger in the surface layer, and the compressive strain and longitudinal shear strain are at the joint Sudden change occurs; as the load increases, the pavement displacement, compressive stress, longitudinal shear stress, compressive strain, longitudinal shear strain, and transverse shear stress of each structural layer gradually increase, the overall structure of the pavement changes, and the probability of road damage increases. It can be seen that the changes in mechanical characteristics of asphalt pavement under different loads and different depths provide a new research idea for mountain highway pavement protection.

Highlights

参考文献 [1] WangY, LuY J, Si C D, et al Finite element analysis for rutting prediction of asphalt concrete pavement under moving wheel load [J]
The results show that the compressive stress, longitudinal shear stress, and transverse shear stress are mainly concentrated in the surface layer and have a relatively large impact on the surface layer; the displacement value, compressive strain, and longitudinal shear strain are larger in the surface layer, and the compressive strain and longitudinal shear strain are at the joint Sudden change occurs; as the load increases, the pavement displacement, compressive stress, longitudinal shear stress, compressive strain, longitudinal shear strain, and transverse shear stress of each structural layer gradually increase, the overall structure of the pavement changes, and the probability of road damage increases
如图15所示,与标准轴载100kN对应的最大横向剪应力相比,120kN、140kN、160kN、180kN、200kN作用下的最大横向剪应力分别增加23.1%、43.1%、67.4%、 84.6%、104.6%,和纵向剪应力增加幅度相近,由此可知,轴载增加使得路面整体的结构受力均有所增加,要严格控制山区公路通行车辆的载货量,防止路面结构发生剪切破坏。

Summary

Introduction

参考文献 [1] WangY, LuY J, Si C D, et al Finite element analysis for rutting prediction of asphalt concrete pavement under moving wheel load [J]. 摘要:山区公路由于其特殊的自然及地理条件导致病害种类繁多,路面的维护较为困难,从理论方面分析病害发生原因尤为重要,为探究山区公路路面的结构力学特征与荷载之间关系,利用有限元模拟方法研究了在荷载作用下不同路面结构层深度的压应力、结构层位移、压应变、横向剪应力、纵向剪应力、纵向剪应变变化趋势。结果表明:压应力、纵向剪应力、横向剪应力主要集中在面层,对面层影响相对较大;位移值、压应变、纵向剪应变在面层较大,压应变、纵向剪应变在联结处发生突变;随着荷载增大,各结构层的路面位移、压应力、纵向剪应力、压应变、纵向剪应变、横向剪应力逐渐增加,路面整体结构受力发生变化,路面发生病害的概率增加。可见,沥青路面在不同荷载作用下、不同深度下的力学特性变化情况,为山区公路路面防护提供了一种新的研究思路。成机理[1,2,3,4,5],通过现场实验验证山区道路在荷载下的应力变化[6,7]。国内李海滨等人改变半刚性基层和沥青面层的厚度

Results

Conclusion