Downward exhaust pressure reducing device of geomembrane

Abstract

The invention discloses a downward exhaust pressure reducing device of a geomembrane. The device comprises a water layer (1), a soil layer (2), the geomembrane (3) and a soil layer (4); and an exhaust device comprises a superfine soil layer (5), a superfine sand grain layer (6), a hard medium gravel layer (7), a hard large gravel layer (8) and a medium uniform stone layer (9). The working principle of the device is as follows: the device is mainly applied to a leakage preventing dam body; the geomembrane (3) is arranged between the soil layer (2) and the soil layer (4); and the exhaust device is arranged in the middle of the geomembrane (3). The main function of the structure is to upwards exhaust high-pressure gas at the lower layer of the geomembrane (3) to the soil layer through the exhaust device. The hard large gravel layer (8) and the medium uniform stone layer (9) realize the gas collection and the support of the exhaust device; the superfine sand grain layer (6) and the hard medium gravel layer (7) realize upward dispersion of the gas and an exhaust channel; and the superfine soil layer (5) realizes the sealing of a sand layer to prevent upper moisture from downwards leaking.

Description

Technical field [0001] The invention relates to a geomembrane pressure reducing device, in particular to an exhaust pressure reducing device under the geomembrane. Background technique [0002] In recent years, as a new type of anti-seepage material, geomembrane has been widely used in various water seepage prevention projects, and has achieved good results, but it also exposed many problems. For example, the laying of a large area of ​​geomembrane will cause gas to accumulate under the membrane and cannot be discharged. When it accumulates to a certain extent, the geomembrane will burst, commonly known as "blasting". In order to avoid the phenomenon of "fire shooting", there are many solutions in engineering. Among them, the application of exhaust valve is the most widely used because of its simplicity and economy. [0003] For this reason, many scholars have designed exhaust devices under the geomembrane. The principle is basically the same. That is, a component similar to a one...

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Problems solved by technology

However, from the point of view of actual engineering application, the effect of these exhaust valves is not very ideal, the geomembrane is still easy to rupture due to "blasting", and the leakage of the reservoir is still not well resolved

The more critical issue is that in the previous design results, an exhaust valve has only one air intake hole. Due to the dense coating under the film, it is often difficult for the gas to transfer. In the exhaust valve

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