Electronic-clogging experiment device of geotextile

Abstract

The invention relates to an electronic-clogging experiment device of a geotextile. The device consists of three parts, namely, a penetration test main body device consisting of an experiment table, a permeameter, a piezometer tube and a water head scale, a constant water head supply device consisting of a bracket, an auxiliary water inlet container, a valve, a water supply tube, a constant water head inlet container, a water outlet tube, a constant water head outlet container and an overflowing tube, and a voltage loading device consisting of a direct current power supply, an insulating lead, a metal bolt and a drilling circular metal electrode. By using the penetration test main body device and the penetration test main body device, continuous hydraulic power penetration tests with different hydraulic power gradients can be performed to the geotextile, and continuous electric penetration tests with different hydraulic power gradients can be performed to the geotextile by applying a uniform direct current electric field inside the permeameter through the voltage loading device, so that the influence on the clogging of the geotextile caused by electronic effect can be studied.

Description

technical field [0001] The invention relates to a scientific test device for dynamically changing the permeability of geotextiles caused by electrokinetic effect combined with osmotic silting effect. Background technique [0002] As a filter material, geotextiles will inevitably produce different degrees of clogging, so how to judge whether geosynthetics will produce unacceptable clogging in actual projects and how to improve the clogging of geotextiles is still not very good at home and abroad. solved problem. [0003] One of the methods for testing and evaluating clogging characteristics of geotextiles is the indoor test using the gradient ratio method, also known as gradient ratio test or indoor clogging test. Gradient ratio is one of the representative indicators for clogging evaluation. It was proposed by Calhoun in 1972, and was adopted by the U.S. Army Division (1977) and revised as the gradient ratio criterion. The expression is: [0004] [0005] Therefore, the...

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Problems solved by technology

[0006] However, the existing clogging tester and gradient ratio evaluation criteria have some shortcomings: during the seepage clogging test, fine particles in the soil migrate, and if clogging occurs in the geotextile, it will reduce its permeability

However, the existing clogging tester can only measure the permeability coefficient of the system composed of the geotextile and the soil sample within the range of 25 mm above it, and cannot measure the permeability coefficient of the geotextile or the soil sample within the range of 25 mm above it alone, so that it cannot be very Good judgment of the location of silting can lead to misjudgment of silting in the soil layer as silting in the geotextile

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