半刚性基层沥青路面温缩裂缝的有限元分析

Semi-rigid asphalt pavement thermal reflective crack in finite element method

运用有限单元法计算了半刚性基层沥青路面温缩反射裂缝尖端的应力强度因子,并对影响其大小的各因素进行了敏感性分析,结果表明:基层和面层的模量、温缩系数增大会不同程度的导致裂缝尖端应力强度因子的增大;而增加面层厚度能有效降低温缩裂缝尖端强度因子.研究了行车荷载与温度荷载耦合作用下裂缝尖端应力场的强度特征,在这2种荷载共同作用时的裂缝扩展为复合型扩展.

The stress intensity factor of the semi-rigid asphalt pavement is calculated with the finite element method.Sensibility analysis is made on the parameters(modulus, thickness, thermal expansion coefficient) affecting the magnitude of the stress intensity factor. The character of the stress field on the top of the crack is analyzed in the case that both traffic load and temperature load are considered. It is shown that the temperature load and traffic load can produce a compound crack propagation model in the base.