Triaxial independent loading pressure chamber structure true triaxial apparatus

Abstract

The invention discloses a true triaxial apparatus with a three-directional independent loading pressure room structure, wherein, an axial pressure cavity of the main part of the apparatus is connected with the axial pressure source pressure cylinder through a hydraulic pressure conduit. A hydraulic bag is respectively arranged in four side pressure cavities of a sampling base, every hydraulic bag is connected with a lateral pressure source pressure cylinder through lateral pressure inlet conduit; a hydraulic load control part, and a detection signal gathering and control part are both controlled by a control device. The true triaxial apparatus provided by the invention overcomes the disadvantage of the prior true triaxial apparatus that the three major stresses can not be totally separated and the three major stresses are mutually affected in a loading process; and the true triaxial apparatus has the advantage of simulating the trials of various engineering conditions under the dead stress, thus the testing condition is much better in accordance with the practical conditions of the engineering; the true triaxial apparatus also has the advantage of low manufacture cost.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering testing equipment, and relates to a device for testing soil mechanical properties under true triaxial complex stress conditions, in particular to a true triaxial instrument with a three-way independent loading pressure chamber structure. Background technique [0002] At present, the existing soil mechanical property testing equipment mainly includes direct shear instrument, conventional triaxial instrument, plane strain triaxial instrument and true triaxial instrument. Among them, the direct shear instrument only simulates the normal stress and tangential stress on the given shear plane, and can test the shear stress and shear strain on the shear plane, but cannot control the drainage conditions; conventional triaxial instruments can only simulate axisymmetric Stress conditions, general stress conditions cannot be realized; although the plane strain triaxial instrument can control...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a true triaxial instrument with a three-way independent loading pressure chamber structure, which solves the problem that the loading plate of the existing soil mechanical property testing equipment is a rigid plate, and the mutual constraints between the sample and the rigid plate during loading. Problems Constraining Specimen Deformation

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