Test method and device for judging the leakage stability of geomembrane anti-seepage earth-rock dam defects

Abstract

The invention discloses a test method and device for determining the stability of defect leakage of a geomembrane anti-seepage earth-rock dam. The device includes a model water tank, a geomembrane anti-seepage model dam, a water level control device, and a defect leakage measurement system; the dam of the model water tank The inclination angle of the left panel of the body is adjustable, so that different bank-to-slope ratios can be simulated; the defect leakage measurement system includes a high-speed camera and a computer. The present invention obtains the diameter of the leakage and infiltration area of ​​the geomembrane defect by carrying out the defect leakage test of the cushion geomembrane with different water content, establishes a mathematical model for the stability of the defect leakage of the geomembrane anti-seepage earth-rock dam, and obtains the different water content in the actual project. Cushion geomembrane anti-seepage earth-rock dam defect and seepage stability discrimination. The invention has important scientific research significance and engineering application value for guiding the construction of the geomembrane.

Description

technical field [0001] The invention relates to the detection field of geomembranes in water conservancy projects, in particular to a test method and a device for judging the leakage stability of geomembrane anti-seepage earth-rock dam defects. Background technique [0002] As an emerging anti-seepage material, geomembrane has an extremely low permeability coefficient, generally 1.0×10 -11 ~1.0×10 -13 cm / s, so it has been widely used in anti-seepage projects such as earth-rock dams, dikes, cofferdams, reservoir basins, reservoirs, channels, and landfills. The thickness of the geomembrane used in the project is mostly 0.5-2mm. Since the geomembrane is a flexible film material, it is almost inevitable that the geomembrane will be damaged or defective during production, transportation and construction. Engineering practice shows that the leakage caused by geomembrane defects will reduce the performance of the geomembrane anti-seepage system, increase the seepage rate, and ma...

AI Technical Summary

Problems solved by technology

[0005] 1. Existing geomembrane defect leakage tests or numerical simulations mainly investigate the amount of defect leakage, but have not studied the influence range of geomembrane defect leakage on the actual engineering dam surface, and cannot obtain the influence range of defect leakage

[0006] 2. The existing technology does not consider the impact of cushions with different water contents on the leakage range of geomembrane defects, which is far from the actual situation of the project

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