水泥混凝土路面脱空与传荷相互作用机理分析

Analysis on Interaction Mechanism between Void and Load Transfer in Cement Concrete Pavement

摘要:

为了解水泥混凝土路面脱空与传荷相互作用机理，建立了四层体系三维有限元模型，依据现行水泥混凝土路面设计规范设置模型参数的变化范围，分析了不同脱空位置和脱空尺寸下，路面结构参数、层间接触状态对弯沉和传荷系数的影响，在理论上验证了脱空评价方法的适用性。结果表明：层间接触状态对弯沉影响较大，但对传荷系数影响很小；只要传力杆存在，脱空对接缝的传荷能力影响很小；采用板角/板中判定脱空的方法更可靠；面层厚度和土基模量对传荷系数影响最大。综合而言，传力杆的设置对保持水泥混凝土路面的整体性、防止路面开裂起着关键性作用。

Abstract:

A three-dimensional finite element model of a four-layer system is established to understand the interaction mechanism between void and load transfer in cement concrete pavement. Based on the current design specifications for cement concrete pavement, the range of model parameter changes is set, and the influence of pavement structural parameters and interlayer contact state on deflection and load transfer coefficient is analyzed under different void positions and void sizes. The applicability of void evaluation method is theoretically verified. The results indicate that the interlayer contact state has a significant impact on deflection, but has little effect on the load transfer coefficient. As long as the transmission rod exists, the impact of void on the load-bearing capacity of the joint is minimal. The method of using board corner/board center to judge voids is more reliable. The thickness of the surface layer and the modulus of the soil foundation have the greatest impact on the load transfer coefficient. Overall, the installation of transmission rods plays a crucial role in maintaining the integrity of cement concrete pavement and preventing the pavement cracking.