半刚性基层沥青路面面层剪应力峰值的影响因素

目的探讨沥青路面面层剪应力峰值变化规律和影响因素.方法运用多层弹性体系理论,双圆均布荷载下,考虑路面结构层厚度、模量变化以及层间状态的不同,分析半刚性基层沥青路面剪应力峰值的变化规律和影响因素.结果沥青路面剪应力峰值会随面层厚度的增加而减小,随基层厚度的增加而增大;沥青路面使用过程中面层模量变化以及设计选取基层模量过高会导致剪应力峰值的提高;层间出现滑移也将导致沥青路面剪应力峰值的大幅度增加.结论路面结构层模量变化及层间连接状态的不同对沥青路面剪应力峰值有显著的影响;路面结构层厚度对沥青路面剪应力峰值的影响相对较小,但也不容忽视.设计和施工过程中应充分考虑沥青路面剪应力的影响因素并加以控制.

The Influences of Surface Shear Stress Peak Value of Semi-Rigid Base Course Asphalt Pavement Structure

This paper analyses the change rule of asphalt pavement surface shear stress peak value and the factors which influence the change of shear stress peak value.Using the multilayered elastic system theory,under the style of double rounds uniform load,considering the thickness value of pavement structure courses and the stiffness change as well as the difference of interface condition,this paper presents the influencing factors of shear stress peak value and its change rule for semi-rigid base course asphalt pavement structure.Asphalt pavement shear stress peak value can be reduced by the increase of surface layer thickness and be increased as the increase of base course thickness;Asphalt pavement shear stress peak value can also be increased by the changing of surface modulus and interlayer slipping.The results indicate that the change of modulus and the difference of interface condition have the remarkable influence on the asphalt pavement shear stress peak value;the thickness of pavement structure course is also one of the influence factors of asphalt pavement shear stress peak value,which is not obvious comparing the other influence factors.As a result,the influence factors should be fully considered and controlled in the design and construction process.