Method for evaluating and representing permeability characteristics of water permeable pavement

Abstract

The invention provides a method for evaluating and representing permeability characteristics of a water permeable pavement, wherein the method specifically comprises the following steps: building an indoor water seepage experiment platform based on a water permeable pavement structure, and obtaining a water permeable pavement structure permeability coefficient and a base material permeability coefficient by adopting an experiment method; establishing a CFD simulation model through ANSYS-FLUENT, and verifying the effectiveness of the model through an experimental result; measuring the permeability coefficient of the actual pavement structure by adopting an on-site in-situ experiment; and constructing a CFD finite element model according to on-site in-situ permeability experiment conditions, performing simulation by adopting the CFD finite element model to obtain the permeability coefficients, performing simulation analysis, and obtaining actual permeability coefficients of a base layer and a joint material on the basis that the difference of the permeability coefficients obtained based on the experiment meets error requirements, so as to obtain a water permeable pavement surface permeability evaluation result. The method can be applied to the back calculation analysis based on the actual permeability test of the existing water permeable pavement, the water conductivity of the current water permeable pavement is determined through the back calculation analysis, and the effective permeability coefficients are selected as the measurement of the overall permeability of the water permeable pavement.

Description

technical field [0001] The invention belongs to the field of road material engineering, and in particular relates to a method for evaluating and characterizing the permeability characteristics of a permeable pavement. Background technique [0002] Permeable pavement is a common solution for urban stormwater management. The porous area on the pavement allows water to infiltrate into the underground layer, reduces surface runoff, and maintains the natural hydrological function of the area by recharging groundwater, reducing the environmental impact of urban infrastructure. In the design of permeable pavement, good seepage function is an important index of permeable pavement. Permeable pavements must not only have a high surface flow rate at the time of design and construction, but must also retain most of their original flow capacity throughout their design life. Therefore, it is necessary to measure the initial infiltration rate of the newly-built seepage pavement and contin...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a method for evaluating and characterizing the permeability characteristics of permeable pavement, using the permeability coefficient as the permeability performance evaluation index, which solves the problem of inconsistency in characterizing the permeable pavement permeability of different institutions and researchers at present, The permeability coefficient is proposed as a characterization index of permeability capacity, and two related indexes of flow time and flow velocity are provided as a reference

Images