Method for measuring three-dimensional shape characteristic index of asphalt pavement texture

Abstract

The invention discloses an asphalt pavement texture three-dimensional shape characteristic index measurement method, which specifically comprises the following steps: S1, preparing an asphalt pavement rut plate, obtaining rut plate surface texture information, and constructing a rut plate surface texture three-dimensional visual model; s2, selecting a test tire, and acquiring surface texture information of the track plate when the test tire is in effective contact with the asphalt pavement track plate; s3, calculating the depth value zT of the rut plate surface texture of the effective contact part of the test tire and the asphalt pavement rut plate; and S4, calculating the contour skewness Sk ', the apparent anisotropy Ka', the hump degree Ku 'and the average inclination angle theta s' of the surface texture of the rut plate within the depth zT so as to represent the three-dimensional shape characteristics of the surface texture of the rut plate under effective contact with a tire road. According to the invention, the method for measuring the texture three-dimensional shape characteristic index of the asphalt pavement under tire-road contact is effectively realized, so that a reference index is provided for evaluating the skid resistance of the asphalt pavement.

Description

technical field [0001] The invention belongs to the field of road engineering. Background technique [0002] Good skid resistance of asphalt pavement is an important prerequisite for road traffic safety. The source of the anti-skid performance of the pavement is the roughness of the pavement texture. At present, road codes mainly use structure depth and dynamic friction coefficient to reflect the macroscopic and microscopic characteristics of pavement texture, and obtain the overall skid resistance level of pavement. However, with the in-depth research on road anti-skid mechanism and application in recent years, scholars have found that road anti-skid performance is not only the characterization of a single object of the road, but the result of the joint action of tires and roads. At present, many studies focus on the overall measurement and evaluation of pavement texture, and the measurement of the macroscopic structure of the pavement mainly provides the friction force a...

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Problems solved by technology

At present, many studies focus on the overall measurement and evaluation of pavement texture, and the measurement of the macroscopic structure of the pavement mainly provides the friction force and drainage channels for tire deformation, while ignoring the distribution characteristics of pavement texture under the effective contact characteristics between tires and pavement , and its texture distribution characteristics determine the tire contact stress concentration and the degree of deformation of the tread rubber. Therefore, most studies at this stage cannot really reveal the pavement texture characteristics under the tire-road contact mechanism, resulting in the design of the road anti-skid wear layer mixture. It is difficult to consider the real texture distribution requirements, so that it is difficult to make the road surface have good anti-skid performance, and cannot meet the requirements of modern society for driving safety

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