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采用疲劳断裂理论,根据完好路面结构半刚性基层底部弯拉应力等效原则,对三维与平面应变模型荷载进行近似地等效转换。以裂缝扩展速率为等效原则,给出不同轴型和级位下荷载型反射裂缝的轴载换算系数,并与现有沥青路面设计规范进行分析比较。结果表明,基于裂缝扩展速率等效原则的轴载换算系数当轴重小于标准轴载时,比现有沥青路面设计规范中轴载换算系数略微偏大,当轴重大于标准轴载时,要偏小一些。
According to the fatigue fracture theory, according to the equivalent principle of bending and tension stress at the bottom of semi-rigid base of intact pavement, the equivalent load of three-dimensional and plane strain model is converted approximately. Taking the crack growth rate as the equivalent principle, the axial conversion coefficient of load reflection cracks under different shaft types and grades is given and compared with the existing design specifications of asphalt pavement. The results show that when the shaft load is smaller than the standard axle load, the axle load coefficient based on the equivalent principle of crack propagation rate is slightly larger than that of the existing asphalt pavement design code. When the axle load is larger than the standard axle load Smaller.