Directional drainage two-cloth one-film anti-seepage drainage structure

Abstract

The invention discloses a directional drainage two-cloth one-film anti-seepage drainage structure which is formed by two layers of geotechnical cloths and a layer of ridge plastic film clamped between the two layers of geotechnical cloths. The geotechnical cloths are filament non-woven fabrics, the ridge plastic film is formed by a plastic film and parallel and protruded ridges on the film surface; and the ridges and the plastic film are formed in one time. The plastic film is formed by processing high density polyethylene or polyvinyl chloride, the thickness of the plastic film is 0.3-2.0 mm, and one side or two sides of the plastic film are provided with the parallel and protruded ridges. The section of the ridges is trapezoidal or semicircular, the intervals between the ridges are 20-100 mm, and the heights of the ridges are 0.5-2.0 mm. The directional drainage two-cloth one-film anti-seepage drainage structure is arranged on the surface of a subgrade or a subgrade body, the direction of the ridges is perpendicular to the direction of the subgrade; after permeating into the ridge plastic film, rainwater flows downwards along the cross slope of the subgrade along the film surface and flows outside an anti-seepage area in the direction of the ridges, the water flowing area is reduced, the flow velocity is accelerated, infiltration water is drained as soon as possible, and the directional drainage two-cloth one-film anti-seepage drainage structure has wide application prospect in anti-seepage drainage engineering such as the railway subgrade.

Description

technical field [0001] The invention relates to railway and road subgrade engineering, in particular to subgrade anti-seepage and drainage engineering. Background technique [0002] The infiltration of surface water on the subgrade surface of railways and highways is one of the main diseases of the subgrade. If the infiltration of surface water cannot be drained away in time, it will cause the subgrade to become muddy and frost heaving. Hidden dangers, especially ballastless track railways are more susceptible to its hazards. [0003] Both railway and highway subgrades are triangular in shape, with a high center and low sides. Geomembrane is often used as an anti-seepage and drainage measure. The geomembrane is made of plastic material as the anti-seepage material, and is laid on the surface of the subgrade or at a certain depth below the surface according to the shape of the subgrade surface. Usually, 5cm of medium sand is laid on the top and bottom of the geomembrane as a...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing geomembrane anti-seepage drainage structure, surface water infiltrates and flows vertically and laterally along the membrane surface, and finally flows outside the road base body, which increases the flow distance and time of water on the membrane, and prolongs the stay of water in the roadbed. Time is not conducive to roadbed maintenance

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