Horizontal geotechnical plane stress triaxial apparatus for pressure chamber structure

Abstract

The invention discloses a horizontal geotechnical plane stress triaxial apparatus for a pressure chamber structure. The horizontal geotechnical plane stress triaxial apparatus comprises a main machine part, a three-dimensional stress loading and measuring mechanism and a collecting and controlling mechanism. The main machine part structurally comprises four columns fixedly installed on a base, wherein a bottom disc and a top cover are fixedly installed on the upper sections of the four columns, side walls are fixedly connected to four sides of the bottom disc and the top cover, and the bottom disc, the top cover and the four side walls jointly encircle a pressure chamber. A cuboid test sample is placed in the center of an inner cavity of the pressure chamber. The three-dimensional stress loading and measuring mechanism comprises large stress, small stress and intermediate stress loading and measuring mechanisms. According to the device disclosed by the invention, three-dimensional stress, two-dimensional stress and unsaturated three-dimensional stress can be obtained through a plane stress triaxial test, and the stresses do not interfere with each other. Study on shear zones and local deformation of the plane stress test is realized. The mechanical property and strength deformation mechanism of non-saturated soil can be searched under the condition of a plane stress path.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a geotechnical plane strain triaxial instrument with a horizontal pressure chamber structure. Background technique [0002] Existing soil mechanical property testing equipment mainly includes direct shear instrument, conventional triaxial instrument, true triaxial instrument and plane strain triaxial instrument. Among them, the direct shear instrument 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; the conventional triaxial instrument simulates the axisymmetric stress condition, The test of soil mechanical properties under general stress conditions cannot be realized; the true triaxial instrument can realize the simulation of general stress conditions in soil, but for many plane strain boundary value problems, the true triaxial ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a geotechnical plane strain triaxial instrument with a horizontal pressure chamber structure, which solves the problem of keeping the principal strain in one direction always zero and the pressure of pore water and pore air in the plane strain triaxial instrument of the prior art. Controlling and measuring difficult-to-control problems

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