True triaxial dynamic pressure testing machine and method

Abstract

The invention discloses a true triaxial dynamic pressure testing machine and method. The testing machine comprises a true triaxial pressure chamber, a control system, a major principal stress loadingsystem, an intermediate principal stress loading system and a minor principal stress loading system; the major principal stress loading system and the intermediate principal stress loading system comprise actuators, load sensors and pressure heads connected in sequence; the actuators and the load sensors are respectively connected with the control system; the minor principal stress loading systemcomprises test capsules, at least two guide pressure plates and at least two guide slots; the guide pressure plates, the guide slots and the pressure heads correspond to one another; each of the guidepressure plates is contacted with a corresponding pressure head, fixed on the outer side of the corresponding test capsule and can slide in the corresponding guide slot; and the test capsules are connected with the control system. The true triaxial dynamic pressure testing machine disclosed by the invention is simple in structure and convenient to use, and boundary defects in the dynamic true triaxial pressure testing process can be avoided, so that the sample is complete, and the test data are integral.

Description

technical field [0001] The invention relates to a testing machine and a method, in particular to a true triaxial dynamic pressure testing machine and a method, belonging to the field of soil pressure testing. Background technique [0002] True triaxial is a geotechnical instrument used for true triaxial tests. According to the principle of mechanics, any object is subjected to forces from three directions of X, Y, and Z, which are called major principal stress, middle principal stress and small principal stress respectively. Symbol σ 1 , σ 2 , σ 3 express. In conventional geotechnical environments, geotechnical objects are actually in a state of plane strain. To test the mechanical properties of forces in these geotechnical environments, it is often treated as an axisymmetric problem, that is, σ 2 = σ 3 . The conventional triaxial test is to test the sample under axisymmetric stress state. [0003] However, in the actual rock and soil environment, the magnitudes of th...

AI Technical Summary

Problems solved by technology

At present, the conventional true triaxial test has incomplete deformation of the specimen due to the existence of boundary defects

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