沥青路面面层和基层结构模量的反算

Backcalculating Moduli of Surface and Base Courses for Asphalt Pavement

分析了路面面层刚度对路表弯沉盆形状的影响 ,并在此基础上利用“惰性点”理论开发了一套反算路面面层和基层模量的方法 .通过大量理论分析和数值验证发现 ,当路面面层模量较大时 ,荷载作用下路表弯沉盆较坦 ;相反 ,当面层模量较小时 ,路表弯沉盆较陡 .利用这一特性 ,创造了一种新的反算路面模量的迭代方法 ,即利用惰性点方法反算得到的地基模量 ,匹配荷载中心点和附近校核点 2处的弯沉值 ,得到面层和基层的模量 .该方法过程收敛 ,且反算解唯一 .

The influence of surface stiffness on the shape of the deflection basin is discussed,and based on this a novel method of backcalculating moduli of surface and base courses with“inertial point”theory is developed.Through substantial theoretical and numerical analysis,it is found that the deflection basin is flatter when surface course is stiffer;on the contrary,the deflection basin is steeper if the surface course is more flexible.By utilizing this property,a new iterative method for pavement moduli is established.It can backcalculate surface and base moduli by matching deflections of two points,i.e.the center point and a checking point.The backcalculation procedure is convergent,and solutions are unique.Moreover,a set of numerical examples of pavement moduli backcalculation are given,and the sensitivity analysis of results is shown.