Evaluation on Distribution Characteristics of Pore Water Pressure within Saturated Pavement Structure Based on the Proposed Tire-Fluid-Pavement Coupling Model

Binshuang Zheng,Zhengqiang Hong,Jiaying Chen,Runmin Zhao,Xiaoming Huang,Jingwen Ma,Shengze Zhu,Akbar Heidarzadeh

doi:10.1155/2022/5849418

Abstract

To investigate the flow characteristics of pore water in asphalt pavement and the variation law of the pore water pressure under vehicle loading, a novel method based on BA network and quartet structure generation set method was proposed to reconstruct the three-dimensional (3D) pavement model with pores. The permeability coefficient and the gradation curve were adopted to evaluate the reliability and stability of the random growth pavement model. Then, the tire-fluid-pavement coupling model was established with FLUENT 3D based on the fluid Mie–Gruneisen state equation. According to the built fluid-solid coupling model, the pressure-velocity coupled finite volume algorithm was applied to study the distribution of the pore water pressure in asphalt pavement. Results show that the pore water pressure in asphalt pavement decays periodically with time under vehicle loading. For different types of asphalt pavement, the pore water pressure in open-graded friction course (OGFC) pavement is the smallest during the whole process. Moreover, the peak values of the pore water pressure decrease in the order of asphalt concrete (AC) pavement, stone mastic asphalt (SMA) pavement, and OGFC pavement. The maximum negative value of the pore water pressure is generally less than 0.3 times the maximum positive values. As for saturated pavement pores, the pore water pressure is hardly affected by the water film thickness. The positive peak value of the pore water pressure increases on an approximate parabolic curve as the vehicle speed improves gradually, while the negative one remains largely unchanged. The results are expected to help reduce tire hydroplaning risk and provide guidance for the selection of asphalt mixtures of drainage asphalt pavement.

Highlights

Due to its advantages of smoothness, low noise, riding comfort, and so on, especially, the drainage capacity caused by the existence of internal pores, the asphalt pavement becomes a typical pavement in the rainy areas of southern China
Under the repeated action of vehicle loading, the pore water pressure usually generates within asphalt pavement internal structure, which seriously damages the adhesion between asphalt binder and aggregates [1, 2]
To investigate the variation rule of pore water pressure in asphalt pavement under vehicle loading, a novel method based on BA network and quartet structure generation set (QSGS) method for the reconstruction of asphalt pavement 3D model with pores was proposed. e permeability coefficient and the gradation curve were used to validate the reliability of the random growth pavement model. en, based on the fluid Mie– Gruneisen state equation, the tire-water-pavement coupling model was established by FLUENT 3D to analyze the distribution characteristics of pore water pressure under vehicle loading. e main findings are as follows: (1) Based on BA network and QSGS method, the established random growth model of asphalt pavement is close to the formation process of porous media

Summary

Introduction

Due to its advantages of smoothness, low noise, riding comfort, and so on, especially, the drainage capacity caused by the existence of internal pores, the asphalt pavement becomes a typical pavement in the rainy areas of southern China. Under the repeated action of vehicle loading, the pore water pressure usually generates within asphalt pavement internal structure, which seriously damages the adhesion between asphalt binder and aggregates [1, 2]. It can cause moisture damage and even structural damage of asphalt pavement [3,4,5,6]. E pore water pressure in asphalt pavement is considered as one of the major causes of pavement damage. In order to study the change law of pore water pressure in asphalt pavement, studies about numerical calculations and theoretical analyses have been carried out to calculate Studies have shown that asphalt pavement with porosity between 8% and 15% is more prone to water damage, which is directly related to the pore water pressure [7].

Results

Discussion

Conclusion