Geotextile axial-compression clogging test device and method thereof

Abstract

The invention belongs to the field of geosynthetics testing, and particularly relates to a geotextile axial compression method silting test device and method, wherein the sample container includes a water tank, a retaining ring, a ring knife, a permeable plate and a sample cover, and the protective rings are placed in the water tank in sequence. The ring, the permeable plate and the sample cover, the deformation measuring device and the axial pressure device are in contact with the sample, the ring knife is set between the top permeable plate and the bottom permeable plate, and the axial pressure device passes through the steel ball in the center of the top surface of the sample cover Attached to the sample cover. Beneficial effects of the present invention: through the axial pressurization device, the water of the soil sample itself is under pressure to drive the soil particles to migrate and cause the clogging of the geotextile, which not only solves the problem that the traditional gradient ratio method must use external water sources to provide hydraulic gradients, Read the water level of the piezometric tube and calculate the permeability coefficient through the water seepage. There is an error between the water level of the piezometric tube and the actual water head, and it is difficult to determine its plugging in low-permeability soil. It can also be used to test its performance in a specific Plugging characteristics under vertical pressure.

Description

technical field [0001] The invention belongs to the field of geotechnical synthetic material testing, and in particular relates to a geotextile axial compression clogging test device and method. Background technique [0002] Siltation means that when the geotextile is working, the small particles in the soil gather on the surface of the geotextile during the process of passing through the geotextile, or form a layer of impermeable water, or block the end of the filter channel of the geotextile, or stay in the geotextile. The interior of the fabric, resulting in a decrease in the water permeability of the geotextile. Clogging is usually assessed in terms of a decrease in water flow through the fabric, and an increase in soil particles entering the fabric. [0003] On the one hand, with the rapid development of my country's port engineering, waterway engineering and offshore engineering, a large number of soft soil foundations need to be reinforced. Soft soil foundations have...

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Problems solved by technology

In addition, as the water head of the piezometric tube increases, the seepage rate of water will also decrease; the longer it takes for the piezometric tube head to stabilize, the greater the impact of water evaporation on it

To sum up, when soils with low permeability coefficients such as silty clay and clay are used, the head stability time of the gradient ratio method is as long as several days, and the test period is long.

[0015] 2) It is difficult to accurately determine the stability of the reading of the piezometric tube

Due to the slow change of the water head of the piezometric tube and the influence of water evaporation, it is difficult to accurately judge whether the piezometric tube is stable. If the judgment is wrong, it will directly lead to an error in the calculation result of the gradient ratio

[0016] 3) Due to the long test time, when there are many fine particles in the soil, the nozzle of the piezometric tub

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