Device suitable for acoustic triaxial test, and implementation method thereof

Abstract

The invention relates to a device suitable for an acoustic triaxial test, and an implementation method thereof, and belongs to the field of geotechnical test calculation. The device comprises a pressure chamber, a coupling agent storage bin, a porous stone, a triaxial soil sample, a pressurized base, a gradual pressurization series bin and an acoustic probe; the top of the pressure chamber is fixedly connected with a pressure chamber cover; the pressure chamber cover and the coupling agent storage bin are integrated; the acoustic probe is put in the coupling agent storage bin, and connected with an ultrasonic acquisition instrument; the gradual pressurization series bin is arranged below the bottom surface of the pressure chamber, and communicated through a pressurization hole; the gradualpressurization series bin is connected with a hydraulic and water-pressure controller; the lower part of the coupling agent storage bin is contacted with the triaxial soil sample; the triaxial soil sample is put on the pressurized base; and the pressurized base is separately connected with a hole pressure sensor and a water quantity collection instrument. The device in the invention is simple instructure and accurate and reliable in calculation result; the problem that contact between the acoustic probe and the triaxial soil sample is non-steady can be overcome; the stability of the confining pressure flow velocity is ensured; and the device can be used for stress state evolution law observation in a triaxial soil sample loading process.

Description

Technical field [0001] The invention belongs to the field of geotechnical test calculations, and relates to a device suitable for acoustic triaxial test and an implementation method thereof, which can be used to evaluate the change law of particle and pore structure during the triaxial test of soil, and to study soil under triaxial loading environment The strain state. Background technique [0002] The structural evolution law and strain state of soil in the process of stress are important indicators reflecting the strength performance. The measurement of the microstructure of the material often uses techniques such as scanning electron microscopy in contact with the external source of the material. The methods used to detect the internal pores and damage of the structure mainly use indirect testing of acoustic wave, electrical and thermal properties. Different from continuous materials, the pores and structure evolution laws of soil can only be revealed in the process of stress...

AI Technical Summary

Problems solved by technology

[0003] However, the acoustic wave testing technology has high requirements for the continuity of the material to be tested, and requires a good interface coupling material

Therefore, it is impossible to complete the test by using conventional permeable stones in direct contact with the acoustic probe

At the same time, the contact force between the probe and the coupling material is different, and the microstructure reflected by it is also different. The current three-axis loading equipment cannot realize the constant contact force between the probe and the material to be tested.

At the same time, the flow of the confining pressure of the triaxial equipment also significantly affects the results of the soil material to be tested

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