A device suitable for acoustic triaxial test and its implementation method

Abstract

The invention relates to a device suitable for acoustic wave triaxial test and its implementing method, belonging to the field of soil engineering test calculation. The device includes a pressure chamber, a couplant storage chamber, a permeable stone, a triaxial soil sample, a pressurized base, a progressively pressurized serial chamber, and an acoustic wave probe. The top of the pressure chamber is fixedly connected to the pressure chamber cover, and the pressure chamber cover and the couplant reserve are integrated. The acoustic wave probe is placed in the couplant reserve chamber and connected to the ultrasonic acquisition instrument; The pressurization hole is connected, and the progressive pressurization series chamber is connected with the hydraulic and water pressure controllers; the lower part of the couplant storage chamber is in contact with the triaxial soil sample, and the triaxial soil sample is placed on the pressurized base, which is respectively connected to the pore pressure sensor , Water volume collector connection. The invention has simple structure, accurate and reliable calculation results, overcomes the unstable problem of the contact between the acoustic wave probe and the triaxial soil sample, ensures the stability of the flow velocity of the confining pressure, and can be used for observing the evolution law of the stress state during the loading process of the triaxial soil sample.

Description

technical field [0001] The invention belongs to the field of geotechnical testing and calculation, and relates to a device suitable for acoustic triaxial testing and an implementation method thereof, which can be used to evaluate the change law of particles and pore structures in the process of soil triaxial testing, and to study soil under triaxial loading environments state of strain. Background technique [0002] The structural evolution law and strain state of the soil during the stress process are important indicators to reflect the strength performance. The measurement of the microstructure of materials often uses technologies such as scanning electron microscopes that are in contact with external sources of materials. The methods used for the detection of internal pores and damage of structures mainly use indirect tests of acoustic waves, electrical and thermal properties. Different from continuous materials, the pore and structure evolution laws of soil can only app...

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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