Device for large-scale true tri-axial test of original grading rockfill body and use method of method

Abstract

The invention discloses a large-scale true tri-axial test method and a large-scale true tri-axial test device, which can be used for carrying out the true tri-axial test on an original grading rockfill body. The device is arranged in a concrete cave chamber; six faces of a sample are loaded by rigid slabs; three directional main stress is applied by a hydraulic jack controlled by adopting a hydraulic system; two layers of rubber membranes are sleeved at the inner side of a steel plate so as to reduce friction; silicone grease is coated between the rubber membranes; and rigidity compression plates are respectively provided with a displacement sensor or a dialgage used for determining the deformation of the sample in all directions. The device can be used for testing a large-sized original grading sample of the rockfill body, therefore, the size effect can be completely avoided, larger axial strain can be achieved, and a complicated stress-strain path can be simulated.

Description

technical field [0001] The invention relates to a test device and its use method, in particular to a large-scale true triaxial test device of an original graded rockfill body and its use method. Background technique [0002] Rockfill body is a typical discontinuous granular medium material, which has the advantages of convenient material acquisition and good adaptability, and has been widely used in rockfill dam engineering, coastal engineering, embankment construction and other projects. It is of great significance to study the mechanical properties of rockfill body, exert its strength, control the deformation of engineering structure and improve the design level. [0003] Due to the small sample size of the existing triaxial test equipment, the mechanical properties of the original graded rockfill body are not easy to measure, and the research is generally carried out by reducing the size of the sample, but the scaled test obtained by each method of scaling All of these h...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problem that the test results in the prior art cannot accurately and comprehensively reflect the mechanical properties of the rockfill body, etc.; it provides a test result that can accurately and comprehensively reflect the mechanical properties of the rockfill body, It can test large-scale original graded samples of rockfill body, completely avoid the size effect, and can achieve large axial strain, a kind of large-scale true triaxial original grade rockfill body that simulates complex stress-strain path Test device and method of use

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