An intelligent triple geotechnical triaxial instrument for constant load loading or unloading

Abstract

The invention discloses a constant load loading or unloading intelligent triplex geotechnical triaxial apparatus. The constant load loading or unloading intelligent triplex geotechnical triaxial apparatus comprises an axial loading system, a feedback automatic confining pressure control system, and an automatic mobile and control system of an industrial camera for measuring deformation of a soil sample, and is suitable for a triaxial pressure chamber for measuring deformation digital image of the soil sample. The triaxial apparatus uses a counterweight for gradually applying constant vertical load, triaxial tests of three soil samples can be carried out simultaneously, triaxial tests of same confining pressure and different axial pressures / different confining pressures and same axial pressure / different confining pressures and different axial pressures can be completed at one time, counterweight loading enables automation, the automatic confining pressure control system and the soil sample deformation digital image measurement system are integrated. The axial loading employs the counterweight and a lever for loading, which solves the problems of load fluctuation generated due to motor loading and reduced service life due to continuous positive and negative rotation of the motor. a RC circuit is employed for control of switching on or off electricity on an electromagnet, and automatic loading and unloading of the counterweight can be realized.

Description

technical field [0001] The invention belongs to the field of civil engineering and relates to an intelligent triple geotechnical triaxial instrument for constant load loading or unloading. Background technique [0002] Triaxial shear tests and consolidation compression tests are the most important and commonly used tests in geomechanics and engineering. The former measures the relationship between axial stress and strain under equal surrounding pressure to study the stress-strain and strength properties of soil, and the latter measures the relationship between axial stress and deformation (void ratio) under the condition of no lateral deformation. to study the compressive properties of soil. The equipment used in both are geotechnical triaxial instrument and consolidation compression instrument respectively. [0003] Conventional triaxial instrument is mainly composed of triaxial pressure chamber, axial loading system, confining pressure loading system, force and deformati...

AI Technical Summary

Problems solved by technology

The deformation measurement of soil samples mostly adopts the contact measurement method, and the measurement accuracy is not high enough.

[0004] The triaxial test of constant load loading and unloading with a conventional triaxial instrument has the following problems: the traditional triaxial test instrument using an AC motor as a power source is difficult to achieve constant load control; the triaxial test using a stepping motor or a servo motor as a power source When the instrument maintains a constant load loading and unloading, there will be load fluctuations, which will damage the life of the motor

On the other hand, the existing triaxial instruments only have one test system, that is, the test of one sample can only be completed at a time.

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