Three-dimensional-drainage roadbed structure for preventing water damage of road in cold region and construction method thereof

Abstract

The invention relates to a three-dimensional-drainage roadbed structure for preventing water damage of a road in a cold region. The structure is characterized in that a three-dimensional drainage system consisting of horizontal drainage layers, vertical drainage passages and a slope drainage layer is arranged inside a road embankment; the horizontal drainage layers comprise at least two horizontal reinforced drainage layers; the vertical drainage passages are arranged between the topmost reinforced drainage layer and the bottommost reinforced drainage layer; a roadbed slope is laid with a drainage plate and a geotechnical waterproof material layer; a longitudinal and transverse drainage pipe network is arranged inside the bottom reinforced drainage layer; each middle reinforced drainage layer is provided with an air duct; a geotechnical waterproof material layer and a geotechnical reinforced material layer are laid on the top and at the bottom of each reinforced drainage layer respectively. Through reasonable arrangement of a three-dimensional drainage and waterproof structure in a roadbed, water can be quickly removed from the roadbed from multiple layers, thus helping to protect a road surface from frost heaving, thaw collapse, frothing and other problems. The invention further discloses a construction method of the three-dimensional-drainage roadbed structure for preventing the water damage of the road in the cold region.

Description

technical field [0001] The invention relates to a highway subgrade structure and a construction method, in particular to a three-dimensional drainage subgrade structure and a construction method for preventing road water damage in cold regions by setting horizontal drainage, vertical drainage and side slope drainage in embankments. Background technique [0002] Water damage (such as frost heaving, thawing and muddying) is a common phenomenon of freezing damage on highways in cold regions, and it is also one of the main causes of early damage to asphalt pavements in my country, especially roads in cold regions. A large number of pavement damage surveys at home and abroad show that the free water entering the pavement structure is the primary factor causing pavement damage. [0003] At present, the solution to the water damage of roads mainly starts from two aspects: one is to improve the water damage resistance of asphalt mixture, that is, to enhance the water stability of as...

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Problems solved by technology

[0007] 1) Only horizontal drainage is considered, the horizontal drainage path is too long, and the drainage effect is poor;

[0008] 2) The infiltration of rainwater along the slope is not considered;

[0009] 3) The reinforcement of the embankment is not considered

[0010] To sum up, although the existing methods have achieved good results under suitable engineering conditions, there are still some areas to be improved. For example, although the existing surface water treatment measures can reduce the infiltration of water, they have not Consider the problem of infiltration of rainwater along the slope; the main measure to remove groundwater is to set up horizontal drainage bodies, whose drainage path is too long and the drainage effect is poor

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