Measurement mechanism for lateral deformation of pressure chamber of true triaxial apparatus

Abstract

The invention discloses a measurement mechanism for lateral deformation of a pressure chamber of a true triaxial apparatus. The pressure chamber of the true triaxial apparatus is formed by a pressure chamber base, pressure chamber lateral walls and a pressure chamber top cover. Four pressure cavities are symmetrically distributed in the pressure chamber, and an emulsion membrane is respectively arranged in the four pressure cavities, and four emulsion membranes are respectively connected with an external pressure source and respectively form flexible hydraulic capsules after being filled withliquid. Lateral displacement measurement guide rods are radially and horizontally arranged in the four pressure cavities in a penetrating mode. One ends of the lateral displacement measurement guide rods penetrate through the corresponding emulsion membranes to be fixedly provided with vertical inner end plates which are flushed with the outer surfaces of the flexible hydraulic capsules, the other ends of the lateral displacement measurement guide rods extend out of the pressure chamber to be respectively connected with an electronic dial indicator. The measurement mechanism for the lateral deformation of the pressure chamber of the true triaxial apparatus is suitable for the true triaxial apparatus with axial rigidity loading and lateral flexible loading, and accurate measurement on the lateral deformation through the true triaxial apparatus is achieved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering testing equipment, and in particular relates to a lateral deformation measuring mechanism of a true triaxial pressure chamber. Background technique [0002] In the study of the mechanical properties of soil, the traditional testing instruments include direct shear instrument, one-way compression instrument and conventional triaxial instrument. Pay attention to. The true triaxial instrument can realize the experimental research on the soil under complex stress conditions, and has the advantages of comprehensively and truly reflecting the three-dimensional principal stress state of the soil unit. [0003] Many different types of true triaxial instruments have been designed at home and abroad. Although the design ideas are different, the core idea is to focus on the independent control and measurement of the three principal stress and principal strain components. From the three-way...

AI Technical Summary

Problems solved by technology

Based on the analysis of these loading methods, the existing one-way rigid loading and two-way flexible hydraulic loading system is theoretically feasible, but in actual operation, due to the inevitable inflation of the hydraulic bag and the fact that the hydraulic bag rotates with the plane of its isolation plate Because of this, there is a certain error in the measurement of the two main directions of deformation in the horizontal plane

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