摘要
泊松比取值对于柔性基层沥青路面结构动力响应的影响是多方面的。为探讨泊松比取值对柔性基层沥青路面结构受力的影响,利用Bisar3.0软件模拟了典型柔性基层沥青路面结构的轮载动力响应,分别对路表弯沉、沥青面层层间拉应力、剪应力及土基顶面压应变进行了计算分析。结果表明:弯沉值随着沥青混合料泊松比的增大而逐渐减小;面层层底拉(压)应力对泊松比的变化较为敏感,中面层尤为明显;沥青混合料泊松比的取值大小对上面层和中面层层内剪应力影响较大,对下面层层内剪应力影响较小;土基顶面压应变随泊松比的增大而逐渐减小。路面设计中应充分考虑泊松比取值对路面结构力学特性的影响。
The influence of Poisson's ratio on the dynamic response of flexible base asphalt pavement structure is various.In order to investigate the influence of Poisson's ratio on the structural stress of flexible base asphalt pavement,the wheel load dynamic response of typical flexible base asphalt pavement structure was simulated by Bisar 3.0 software.The deflection of road surface,tensile stress,shear stress and compressive strain of top surface of soil foundation were calculated and analyzed respectively.The results show that the deflection value is related to the asphalt mixture.The bottom tensile(compressive)stress of the surface layer is more sensitive to the change of Poisson's ratio,especially in the middle layer.The value of Poisson's ratio of asphalt mixture has a great influence on the internal shear stress of the upper layer and the middle layer,but a little influence on the internal shear stress of the lower layer.The compressive strain of the top surface of the soil were decreases with the increase of Poisson's ratio.The influence of Poisson's ratio on the mechanical properties of pavement structure should be fully considered in pavement design.
作者
王伟
邢渊浩
WANG Wei;XING Yuan-hao
出处
《内蒙古公路与运输》
2021年第3期13-15,共3页
Highways & Transportation in Inner Mongolia
关键词
柔性基层
沥青路面
泊松比
动力响应
flexible base
asphalt pavement
Poisson's ratio
dynamic response
