沥青路面柔性基层和半刚性基层模量理论研究

Theoretical analysis of flexible base and semi-rigid base modulus on asphalt pavement

针对荷载作用下,柔性基层(级配碎石)半刚性沥青路面结构下面层产生的较大拉应力,考虑了级配碎石材料的非线性特征,采用弹塑性有限元法,分析了吉林通化试验路级配碎石和半刚性基层模量对沥青下面层层底最大拉应力的影响,在此基础上建议柔性基层和半刚性基层的模量应分别在400～500MPa、1500～2000MPa.与试验路结果对比表明了计算分析结果的适用性.

Under the action of load, semi-rigid asphalt pavement with flexible base (granular macadam) can cause bigger pulling stresses at the bottom of the asphalt pavement. So non-linear performance of granular macadam was taken into account. With elastic-plastic finite element method, asphalt undersurface maximum pulling stresses by granular macadam modulus and semi-rigid base modulus influence were analyzed to Jilin Tonghua test road. Above this, 400 - 500 MPa of flexible base modulus and 1500 - 2000 MPa of semi-rigid base modulus are proposed respectively. Test results indicate the applicability of calculation and analysis results.