Cohesive soil large-scale triaxial sample consolidating apparatus and consolidating method thereof

Abstract

The invention discloses a cohesive soil large-scale triaxial sample consolidating apparatus and a consolidating method thereof. The consolidating apparatus comprises a triaxial sample, a pedestal, a top cover, a rubber gasket, an electrode, a DC power supply, a bottom water penetrating board, a top water penetrating board and a combined insulated board; periphery of the cohesive soil triaxial sample is isometrically provided with electrodes, a central axis of the triaxial sample is provided with electrodes, electrodes arranged at the periphery are connected with the bottom water penetrating board at the bottom of the triaxial sample, the bottom water penetrating board is communicated with a DC power supply '-'by the combined insulated board, the electrode arranged on the central axis is connected with the top water penetrating board, the top water penetrating board is communicated with the DC power supply '+' by the combined insulated board, and the combined insulated board is composed of an insulated board, a spring and a contact. When the apparatus is used, the triaxial sample is prepared on the pedestal, simultaneously electrodes are arranged in the triaxial sample, communication between electrodes and leads are guaranteed, a rubber membrane is bundled, a confining pressure is applied, and the DC power supply is powered on for carrying out the triaxial sample consolidation. The consolidating apparatus has the advantages of simple structure, convenient operation, reliability, safety, substantially shortened consolidating time, and reduced test time and manpower.

Description

technical field [0001] The invention relates to the technical field of civil and water conservancy engineering tests, in particular to a cohesive soil large triaxial sample consolidation device and a method thereof. Background technique [0002] Earth-rock dams are widely used in water conservancy projects because they can adapt to complex geological conditions and have strong earthquake resistance. High earth-rockfill dams will have catastrophic consequences once they fail due to the high water capacity of the dams. The clay core wall is an important part of the stability of an earth-rock dam, so a large number of experimental studies need to be carried out in the design and analysis process to better understand its static and dynamic characteristics. In the research process, the triaxial test method is generally used. Firstly, a saturated sample of corresponding density is prepared according to the actual engineering requirements, and then the sample is consolidated under...

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Problems solved by technology

[0005] Before the present invention, Chinese patent (Patent No.: ZL200910183525.2) disclosed a method of electroosmotic consolidation of gravel-mixed large triaxial test. The device placed electrode plates on both ends of the triaxial sample for electroosmosis. The distance between the electrodes is the height of the entire triaxial sample. When the size of the triaxial sample is larger, the consolidation time is still longer. In addition, the wire and the electrode plate are connected by winding, which is inconvenient to operate and difficult to ensure the stability of the conductivity.

[0006] The patent "A Rapid Triaxial Consolidation Shear Test Method for Soil (Patent No.: ZL200810243976.6)" improves the sample preparation method of the conventional triaxial test by setting a cylindrical sand core in the center of the cylindrical triaxial sample In order to reduce the impact, the diameter of the sand core should not be too large. Although the consolidation time of the triaxial sample can be reduced by using this method, when the size of the triaxial sample When larger, the consolidation time is still longer

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