具有碎石基层的半刚性沥青路面碎石层的应力状态变化规律的研究

Study on Macadam Course Stress State Pattern of SemirigidAsphalt Pavement with Macadam Base

为分析具有碎石基层的半刚性沥青路面结构中级配碎石层的应力变化规律,根据Drucker-Prager屈服准则,采用弹塑性有限元法,对级配碎石层竖向压应力和水平压应力沿深度和水平方向的变化情况进行了计算,总结了竖向压应力和水平压应力沿深度和水平方向的变化规律,分析表明,在整个荷载圆范围内级配碎石层竖向压应力为142～349kPa,荷载圆边缘处水平压应力为40～66kPa.该结论可为级配碎石材料室内动三轴试验施加偏压和围压提供借鉴.

To analyze the grading macadam course stress changing pattem of semi-rigid asphalt pavement with macadam base, according to Drucker-Prager yielding model and elastoplastic Finite Element Method （FEM）, changings of vertical pressing stress and horizontal pressing stress were calculated to semi-rigid asphalt pavement with flexible base （grading macadam） . Changing pattern of macadam course vertical pressing stress and level pressing stress were summed up. The result indicates that grading macadam course vertical pressing stress equals to 142 - 349kPa among the loading circle and horizontal pressing stress equals to 40 - 66kPa on the edge of loading circle. This conclusion can provide references for the grading macadam dynamic triaxial experiment partial pressure and enclosed pressure in the laboratory.