青海交通科技

针对小交通量低轴载公路水泥混凝土路面加铺工程中新旧结构层间界面的受力难题，本文采用有限元层间接触算法，构建多板连接路面分析模型，系统探究层间结合状态与旧面层弹性模量对加铺层力学特性的影响规律。计算结果表明：层间摩擦系数从0增至5时，加铺层板底最大拉应力最高降幅达48.0%；对于加铺路面，当旧面层弹性模量在6.6～19.8 GPa范围内变化时，面板底部最大拉应力变化幅度为13.0%。研究证实，层间结合状态、旧面层弹性模量与轴载水平存在耦合效应，均对加铺层的应力和应变分布产生显著影响。

To address the stress issue at the interface between the new and old layers in the overlay project of cement concrete pavement on low-traffic and low-axle-load highways, this paper adopts the finite element interlayer contact algorithm to construct an analytical model of multi-slab connected pavement, and systematically explores the influence of the interlayer bonding state and the elastic modulus of the old surface layer on the mechanical properties of the overlay. The calculation results show that when the friction coefficient increases from 0 to 5, the maximum reduction of the tensile stress at the bottom of the overlay slab reaches 48.0%; when the elastic modulus of the old surface layer varies within the range of 6.6～19.8 GPa, the variation amplitude of the maximum tensile stress at the bottom of the slab is 13.0%. The research confirms that the interlayer bonding state, the elastic modulus of the old surface layer, and the axle load level have a coupling effect, and all have significant impacts on the stress and strain distribution of the overlay.