Abstract
This study aims to investigate the dynamic response regulation by combining the theoretical analysis and field test under the vibration rolling condition. Based on the viscoelastic theory of a multilayer system, the dynamic stiffness method (DSM) incorporating multidimensional Fourier transform is proposed to solve the 3-dimensional (3D) dynamic response of pavement under vibration compaction. The stiffness matrix of each pavement layer and the global stiffness matrix of the whole pavement structure are obtained. By combining vibration load with boundary conditions, the 3D exact solution is obtained and validated by the finite element method. In addition, the field test is also conducted using a series of sensors and equipment (e.g., SmartRock sensor, acceleration sensor, temperature sensors, and non-nuclear density meter) to calibrate the theoretical model to determine the wave number and dynamic modulus during the vibration rolling process. Then, considering the factors during compaction, the rules of displacement variation and pavement acceleration are investigated in terms of modulus, thickness, and density. The results show that the 3D displacement and acceleration components both vibrate with high frequencies during compaction, and peak acceleration in the vertical direction prevails. For the vertical displacement, its distribution beneath the drum of the roller is almost even except that it drops to zero abruptly around the drum edge. The relationship between thickness and acceleration follows a linear function, and the acceleration on the pavement surface rises when the thickness increases. Although the density and modulus increase with rolling times, the effect of modulus on acceleration is more obvious and prominent than that of density. In summary, the DSM presented in this article provides a robust method to calculate the dynamic response of pavement under vibratory compaction and to back-calculate the modulus of compacted pavement layers. Moreover, the regulation also sheds insight on the understanding of vibration compaction mechanism that there is a potentially strong correlation between compaction state, modulus, and vibration acceleration.
Highlights
It is widely known that compaction is a key procedure in the construction process of asphalt pavement
This study aims to investigate the dynamic response regulation by combining the theoretical analysis and field test under the vibration rolling condition
Based on the viscoelastic theory of the layered system and Fourier transform method, a set of differential governing equations of dynamic response is established under the vibration rolling load, which is simplified into a matrix form
Summary
It is widely known that compaction is a key procedure in the construction process of asphalt pavement. The pavement construction process is affected by many complicating factors, such as exciting force, compaction work, amplitude, vibration frequency, and rolling speed (Coleri et al, 2012; Fares et al, 2014; Xu and Chang, 2016; Jia et al, 2019; Liu et al, 2019; Jing et al, 2020; Paulmichl et al, 2020; Liu et al, 2022). There is little quantitative study as to how these factors affect the compaction and to what degree the effects are significant It is, challenging to accurately reveal the compaction mechanism due to so many complex influencing factors. There is a big gap between theory and practice for improving the compaction technology of asphalt pavement (Dan et al, 2020b)
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