沥青混合料同轴剪切强度试验方法研究

Investigation of Asphalt Mixture Co-axle Shear Strength Test Method

摘要:

根据沥青路面混合料受力特点，讨论了同轴剪切强度试验的合理性；通过有限元计算，结合同轴剪切强度试验的破坏特征，确定了同轴剪切强度试验中最大剪应力的出现位置；定义1kN单位荷载作用下试件内最大剪应力为剪切强度系数，计算结果表明，在普通温度（15℃~60℃）条件下，剪切强度系数基本不受温度和混合料模量变化的影响，确定剪切强度系数为定值 ，大小为0.14MPa/kN；车辙试验结果表明沥青混合料同轴剪切强度与沥青混合料高温永久变形具有较好的相关性。

Abstract:

This paper describes a specific laboratory test method for measuring asphalt mixture shear resistance, which was denominated as co-axle shear strength test. The test rationality and reliability was discussed and emphasized, with correct analysis and description of stressed characteristics of asphalt pavement. According to finite element analysis results and co-axle shear test specimen failure plane, the position of max shear stress was determined then. Defining the max shear stress in specimen under 1kN unit vertical loading as shear strength coefficient, which was hardly influenced by mixture modules in normal temperature range from 15℃ to 60℃. Then shear strength coefficient was given as a constant and equals to 0.14MPa/kN. Following these, the regression analysis of laboratory test results shows good relationship between co-axle shear strength and permanent deformation or DS.