Permeable asphalt pavement permeability attenuation model test system and method

Abstract

The invention relates to a permeable asphalt pavement permeability attenuation model test system and method. The system comprises a sample tank and a loading device arranged above the sample tank, the loading device comprises stand columns arranged on the two sides of the sample tank, the top ends of the stand columns are fixed to a top plate, lifting mechanisms are arranged at the two ends of the top plate, and the lifting mechanisms are connected with lifting tables; a guide rail is connected between the lifting tables, wheels are connected to the guide rail in a sliding mode, the wheels are connected with a driving mechanism used for driving the wheels to move in the axis direction of the guide rail. The system also comprisesa first camera shooting part arranged on the top plate and a second camera shooting part arranged on one side of the sample tank, the other side of the sample tank is provided with a first laser scanning part, a spray pipe is arranged below the top plate, and thespray pipe is connected with a water supply device. The system disclosed by the invention can be used for researching the permeability attenuation condition of the permeable asphalt pavement under the combined action of traffic load, silt and rainwater.

Description

technical field [0001] The invention relates to the technical field of experimental equipment, in particular to a see-through asphalt pavement permeability attenuation model test system and method. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Porous asphalt pavement, also known as PA pavement (Porous Asphalt) or OGFC pavement (Open Graded Friction Course), is a pavement containing a large number of penetrating voids (the porosity is usually between 15% and 25%, and most of them are more than 1mm in diameter. For pavement materials with large pores), the permeability coefficient is generally between 2.0mm / s and 5.4mm / s, and some even reach 1.2cm / s. Having a large void ratio is the prerequisite for porous asphalt pavement to achieve a series of special functions such as anti-skid, noise reduction and water permeability. However, the porous asphal...

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Problems solved by technology

In addition, the large void ratio also makes it easier for tiny particles such as dust particles in the air and rubber particles from automobile tires to enter, causing voids to be blocked and affecting its functionality.

Therefore, due to the inherent characteristics of permeable asphalt pavement, it is easily affected by the compaction of cyclic traffic load and the blockage of particulate matter carried by runoff, which reduces the effective void ratio of permeable asphalt pavement and improves the functional advantages of the pavement. gradually weaken

[0004] However, the inventors have found that current research on permeable pavement is still mainly focused on pavement materials, structure, strength and water permeability, etc., lacking in force (traffic load)-flow (rainwater seepage)-quality of large-gap permeable asphalt pavement (Particle migration) The study of void ratio change, particle migration and plugging law under the multi-field coupling effect has led to a lack of reasonable understanding of the permeability decay law of permeable asphalt pavement under the force-fluid-mass multi-field coupling effect

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