Real three shaft pressure box

Abstract

The true three axis pressure box for providing test piece with unequal triaxial pressure includes one sealed cylinder for the test piece to be set in; one external pressure device set on the cylinder, communicated to outside and capable of sliding relatively to the cylinder to apply maximum main stress to the test piece; one inside pressure device inside the cylinder to apply middle main stress to the test piece; and liquid medium filled inside the cylinder to apply minimum main stress to the test piece. The inside pressure device flexible bag with inner flexible steel network and outer rigid frame. The true three axis pressure box has simple structure, high adaptability and reliable pressurizing, and is suitable for use in different types of triaxial pressure test, especially on rock.

Description

Technical field [0001] The invention relates to a pressurizing device, in particular to a pressure tank capable of providing unequal triaxial pressures for a pressure test piece. Background technique [0002] When conducting research or other applications on stratum rocks or other objects, it is often necessary to perform triaxial unequal pressure pressurization experiments on specimens. [0003] The true triaxial pressure gauges currently in use, some have no triaxial box, and the triaxial load (σ 1 , Σ 2 , Σ 3 ) Is all piston pressurization, σ 2 And σ 3 When the piston is pressurized, there is a relatively large friction force between the four sides of the rock specimen and the piston surface, and the friction force has a greater impact on the experimental results; σ 2 And σ 3 The pressurized frame is fixed and cannot adapt to the longitudinal deformation of the rock specimen. [0004] Although some true triaxial pressure gauges have triaxial boxes, σ 2 The pressurizing piston ...

AI Technical Summary

Problems solved by technology

[0003] Some of the true triaxial pressure gauges currently used have no triaxial box, and the three-way load (σ 1 , σ 2 , σ 3 ) are all piston pressurized, σ 2 and σ 3 When the piston is pressurized, there is a large friction force between the four sides of the rock specimen and the piston surface, and the friction force has a great influence on the experimental results; σ 2 and σ 3 The pressurized frame is fixed and cannot adapt to the longitudinal deformation of the rock specimen

[0004] Although some true triaxial pressure gauges have a triaxial box, the σ 2 The pressurized piston is connected from the outside of the three-axis box to the inside of the three-axis box, and the structure is complex; σ 2 There is still friction between the pressurized piston and the two sides of the rock specimen, which has poor versatility and applicability, making it difficult to simulate complex working conditions

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