Rock true-triaxial testing apparatus having ultrasonic phased array real-time imaging system

Abstract

The invention discloses a rock true-triaxial testing apparatus having an ultrasonic phased array real-time imaging system. The rock true-triaxial testing apparatus comprises a host computer, an ultrasonic triggering / reception plate, and an ultrasonic phased array energy transducer, the host computer is connected with the ultrasonic triggering / reception plate, and the ultrasonic phased array energytransducer is coupled with a sample; the ultrasonic triggering / reception plate is composed of an array element switching circuit, a signal amplification adjusting circuit, a digital analog converter,an ultrasonic array element trigger circuit, a trigger-delay circuit, a data collector, and a microprocessor; the array element switching circuit is connected with the signal amplification adjustingcircuit and the ultrasonic array element trigger circuit, the signal amplification adjusting circuit is connected with the digital analog converter through the digital analog converter, the ultrasonicarray element trigger circuit is connected with the digital analog converter through the trigger-delay circuit, and the digital analog converter is connected with the host computer through the microprocessor. The rock true-triaxial testing apparatus has the advantages of good signal to noise ratio, high resolution, and convenient usage.

Description

technical field [0001] The invention belongs to the field of rock mechanics and rock testing, in particular to a rock true triaxial testing device with an ultrasonic phased array real-time imaging system. Background technique [0002] The mesoscopic mechanism is hidden behind the macroscopic phenomenon of rock deformation and cracking, that is, the evolution process of crack initiation, expansion, penetration and destruction on the mesoscopic scale. It is of great theoretical significance and application to find out the evolution law of cracks from the mesoscopic level. value. At present, most of the triaxial compression tests are carried out with industrial CT machines and self-developed loading devices to observe the internal crack propagation and evolution process during the rock failure process, and to a certain extent realize the real-time observation and analysis of the mesostructure during the rock failure process. [0003] The application number is: 201510577392.2, ...

AI Technical Summary

Problems solved by technology

However, on the one hand, acoustic emission technology needs to install several probes on the sample, which is not conducive to the application of load.

On the one hand, the position of the rock crack needs to be calculated from the spatial position of the probe and the time difference of the sound wave arriving at the probe. The result is not intuitive enough, and the error is large; on the other hand, the acoustic emission technology can only give the position, activity, and intensity of the acoustic emission source. , the nature and size of the defect in the acoustic emission source cannot be given, that is, only the approximate location of the crack can be given, and the shape and size of the crack cannot be obtained

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