Double-layer drainage asphalt pavement dynamic water pressure change rule analysis method

Abstract

The invention discloses a double-layer drainage asphalt pavement dynamic water pressure change rule analysis method, and belongs to the technical field of drainage asphalt pavements. The problems thatwhen a double-layer drainage asphalt pavement model is constructed, void ratio is set in a virtual area to generate uniform voids to represent a double-layer drainage asphalt pavement pore structure,the void natural distribution is inconsistent with the void natural distribution after an asphalt mixture is paved, and the dynamic water pressure change rule of the upper layer and the lower layer of a double-layer drainage asphalt pavement is difficult to truly reflect are solved. Aggregate particles are generated through discrete element software to form a particle bed layer to serve as a double-layer drainage asphalt pavement combined model, the model is imported into computational fluid dynamics software for multi-phase flow calculation, and the dynamic water pressure change rule of theupper layer and the lower layer of the double-layer drainage asphalt pavement is disclosed. The double-layer drainage asphalt pavement model disclosed by the invention is high in pore coincidence degree with pores generated in an asphalt mixture paving process, and the invention has important practical significance on analysis of dynamic water pressure of the upper layer and the lower layer of thedouble-layer drainage asphalt pavement and safe driving of vehicles.

Description

technical field [0001] The invention relates to a method for analyzing the variation law of dynamic water pressure on a double-layer drainage asphalt pavement, which belongs to the technical field of drainage asphalt pavement. Background technique [0002] There is a lot of rainfall in summer. The traditional dense asphalt pavement cannot be discharged in time because of its small internal pores, resulting in stagnant water on the road surface. The water can only be discharged from the road surface using its cross slope. Rainwater makes the road flooding more serious. When a vehicle passes by at a high speed, a certain amount of disturbance is generated to the water film on the road surface, and a part of the retained water on the surface is instantly squeezed into the internal space of the asphalt due to the wheel load, resulting in a high pore water pressure. When the wheel load When removed, the water inside the pores will also be discharged outward due to the pumping ac...

AI Technical Summary

Problems solved by technology

[0005] At present, some scholars have analyzed the dynamic water pressure of asphalt pavement through numerical simulation, but most of them mainly consider the mechanical characteristics of tires, such as tire sideslip, water drift, etc. The analysis of the change law of hydrodynamic pressure of the substructure combination needs to be further studied

Secondly, different numerical models also play a decisive role in the change of dynamic water pressure on the double-layer drainage asphalt pavement and the lower layer. However, the current common numerical calculation models are relatively simple, mainly by setting the porosity in the virtual area to generate uniform pores. Characterizing the pore structure of double-layer drainage asphalt pavement is not consistent with the natural distribution of pores after paving porous asphalt mixture, and there is a large gap with the actual pore structure of double-layer drainage asphalt pavement. The result of hydrodynamic pressure distribution is quite different from the actual situation, and there is a large error

Images