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研究了行车纵剪力计算与损伤路面的机理。建立半刚性路面的有限元模型,计算路面裂纹在行车纵剪力作用下的应力强度因子。行车纵剪力是服从正态分布的随机过程,标准方差可以通过行车纵振路面谱和车辆纵振模型得到;裂纹从上到下扩展的速度明显快于从下往上扩展的速度;裂纹扩展的速度与行车纵剪力的4次幂成正比;行车纵剪力对路面的裂纹损伤远远大于轮胎压力。
The calculation of driving slips and the damage mechanism of pavement are studied. The finite element model of semi-rigid pavement is established, and the stress intensity factor of pavement crack under the action of driving longitudinal force is calculated. Driving longitudinal shear force is a stochastic process subject to normal distribution. The standard deviation can be obtained by driving longitudinal vibration road surface spectrum model and vehicle longitudinal vibration model. Crack spreads from top to bottom are faster than bottom to top. Crack propagation Is proportional to the fourth power of driving longitudinal shear force. The driving force of longitudinal shear damage on the road surface is far greater than the tire pressure.