基层设计参数对路面结构力学性能的影响研究

Effect of Base Design Parameters on Pavement Mechanical Performance

以路表弯沉、基层层底拉应力、底基层层底拉应力为考核指标,以基层厚度、模量和底基层模量为考核因素,采用正交方法进行路面结构组合设计。针对每种路面组合结构,利用有限元软件建立模型进行力学计算并得出结论:基层厚度越大,路面力学性能越好;三个因素对路表弯沉和基层层底拉应力的影响排序为基层厚度>基层模量>底基层模量,对底基层层底拉应力的影响排序为基层厚度>底基层模量>基层模量。经综合考虑可得到每个设计参数的最优取值。

Taking surface settlement, tensile stress at base bottom and tensile stress at subbase as examina- tion indexes, and taking the base thickness, base modulus and subbase modulus as influencing factors, the or- thogonal method is used to implement the pavement structure combination design. In allusion to each type of pavement combination structure, models are set up with finite element software to carry on mechanics calculation, which educe the conclusion as follows： the greater the thickness of base is, the better the mechanical properties of pavement has; the sequence of the effect of three factors on surface settlement and tensile stress at base bottom is base thickness〉base modulus〉subbase modulus, and for the effect on tensile stress at subbase bottom, the se- quence is base thickness〉subbase modulus〉base modulus. Through overall consideration, the optimal value of ev- ery base design parameter can be ascertained.