A method for evaluating the permeability performance of permeable asphalt pavement based on fluid-solid coupling analysis

Abstract

The invention discloses a permeable asphalt pavement permeability evaluation method based on fluid-solid coupling analysis, which includes indoor tests to determine material parameters and hydrological parameters of each structural layer of the pavement; establishment of unsaturated seepage models of each structural layer; establishment of a permeable asphalt pavement system The numerical model simulates the initial humidity field inside the pavement system; analyzes the rainfall infiltration process based on the saturated-unsaturated fluid-solid coupling theory, and simulates the dynamic change of the humidity field under rainfall conditions; evaluates the permeability of permeable asphalt pavement. The method of the present invention comprehensively considers the influence of the initial humidity field caused by the groundwater within the range of the road surface and the type of roadbed soil on the internal permeability of the road surface, and more accurately simulates the mutual coupling and influence between the rainfall infiltration process and the fluctuation of the groundwater level; the indoor test Combined with numerical simulation, the transient analysis of the rainfall infiltration process inside the permeable asphalt pavement system can be realized, which can more intuitively evaluate the permeability performance of the road structure, which is feasible and efficient.

Description

Technical field[0001]The present invention belongs to the technical field of water-water performance evaluation of road engineering road surface, and in particular, a method of evaluating a permeability performance of a permeability based on flow-solid coupling analysis.Background technique[0002]The water-water asphalt pavement design mainly considers two performance requirements. On the one hand, there is enough intensity to withstand design load. On the other hand, it is a good penetration performance to penetrate the design of rainfall, avoiding water production. Therefore, after completing road surface materials and structural design based on road traffic, the water-based traffic is designed to evaluate and verify the designed pavement. The current "Highway Drainage Design Specification" (JTGT D33-2012) is based on the pavement structure drain evaluation method of saturated seepage theory, and neglects the role between air and water in the porous medium, and the evaluation concl...

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Problems solved by technology

[0003] At present, the evaluation of the permeable performance of permeable pavement mainly focuses on the study of the permeable performance of a single pavement structure layer, or the small-scale laboratory test research on the performance of permeable pavement system, ignoring the impact of the change of initial humidity field caused by groundwater and subgrade soil types within the pavement range. Influence of internal permeability of pavement and influence of rainfall infiltration process on fluctuation of groundwater level

However, large-scale indoor experiments or research on test road sections are time-consuming and laborious, and the conclusions obtained are difficult to be popularized and applied in other practical projects.

At the same time, the conclusions obtained from the current research are too macroscopic to directly evaluate the infiltration effect through the internal rainfall infiltration process of the permeable asphalt pavement system, resulting in the lack of practical theoretical basis and guidance for the adjustment of the permeable design of the pavement structure

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