A model test system and method for permeable asphalt pavement permeability attenuation

Abstract

The invention relates to a permeable asphalt pavement permeability attenuation model test system and method, comprising a sample tank and a loading device arranged above the sample tank, the loading device includes columns arranged on both sides of the sample tank, and the top of the column is fixed to the top plate , both ends of the top plate are provided with a lifting mechanism, the lifting mechanism is connected with the lifting platform, there are guide rails connected between the lifting platforms, the guide rails are slidingly connected with wheels, and the wheels are connected with the driving mechanism for driving it to move along the axis of the guide rails, and it is also included in the The first camera on the top plate and the second camera on one side of the sample tank, the other side of the sample tank is equipped with the first laser scanning part, and the water spray pipe is installed under the top plate, and the water spray pipe is connected to the water supply device , the system of the invention can study the permeability attenuation of the permeable asphalt pavement under the comprehensive action of traffic load, sediment and rainwater.

Description

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

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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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