沥青路面层间剪切强度的概率分布及可靠性设计

Probability Distribution and Reliability Design of Asphalt Pavement Interlayer Shear Stress

为了对沥青路面层间抗剪能力进行可靠性设计,以现场实测的沥青路面层间剪切强度数据为样本,求出了沥青路面面层与基层、面层与面层间剪切强度的经验密度函数和分布函数,依据分布拟合,对沥青路面面层与基层、面层与面层间剪切强度的概率分布做出了假设,采用科尔莫哥洛夫检验方法,对假设进行了检验.结果表明:沥青路面面层与基层间的剪切强度服从参数为μX1=-1.514 6,σ2X1=0.578 32的对数正态分布,而沥青路面面层与面层的剪切强度则服从参数为αX2=0.959 7,λX2=3.801 2的威布尔分布.根据它们所服从的概率分布,对沥青路面层间抗剪能力进行了可靠性设计,给出了不同可靠度下沥青路面层间剪切应力允许设计值.

In order to make the reliability design for the interlayer shear stress of asphalt pavement, by using the interlayer shear strength sample data of asphalt pavement, which is measured on site, the empirical density function and its distribution function are obtained. Through distribution fitting, the probabilistic distributions of the shear strength on the interlayers are supposed. According to Kolmogorov test methods, the hypothesis testing of them is done. The results show that the shear strength between the asphalt road surface layer and the 2 32 base layer obeys the lognormal distribution （μx1 = - 1.5146,σx1 = 0. 578 ） and the shear strength between the surface layer and surface layer obeys Weibull distribution （αx2 =0. 959 7,λx2 =3. 801 2）. Based on these distributions, the reliability designs for interlayer shear stress of asphalt pavement are done. The allowed design value of the interlayer shear stress for the asphalt pavement is suggested under the different reliability.