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Acoustic emission and resistivity joint monitoring device and monitoring method for rock sample fracture process

A joint monitoring and resistivity technology, applied in measuring devices, using acoustic wave emission technology for material analysis, measuring resistance/reactance/impedance, etc., can solve the problems of affecting analysis results, low test efficiency, and weak ability to resist external environmental noise, etc. problems, to achieve the effect of improving test efficiency

Active Publication Date: 2014-10-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the existing rock fracture process monitoring methods have the following problems: ① The mechanical parameters obtained by the traditional rock uniaxial compression test are not accurate enough to describe the rock fracture process, and the existing monitoring methods, such as resistivity and Acoustic emission monitoring methods have their own limitations, so it is not accurate to judge and analyze the rock fracture process only by a single monitoring method; ② most of the existing resistivity monitoring methods are limited by the low sampling frequency of the instrument and cannot complete Recording the change of resistivity at the moment of rock rupture may lead to the loss of key information and affect the analysis results; ③The existing acoustic emission monitoring method is weak in resisting external environmental noise and is easily disturbed by surrounding noise, resulting in monitoring results There are errors, and at the same time, the layout of the acoustic emission probe is time-consuming and labor-intensive during the test, making the test efficiency very low

Method used

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  • Acoustic emission and resistivity joint monitoring device and monitoring method for rock sample fracture process
  • Acoustic emission and resistivity joint monitoring device and monitoring method for rock sample fracture process
  • Acoustic emission and resistivity joint monitoring device and monitoring method for rock sample fracture process

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Embodiment 1

[0059] Embodiment 1 uses the acoustic-electric integrated test probe described in embodiment 2 and the acoustic-electric integrated test probe clamping device 14 described in embodiment 3 to use a combined real-time monitoring device for acoustic emission and resistivity.

[0060] Example 1

[0061] Such as Figure 1-Figure 7 As shown, on the rigid servo press 1, a rock sample 2 is placed. The rock sample 2 is a conventional cylindrical standard specimen with a size of Ф50mm×100mm, which conforms to the "GB / T50266-99 Engineering Rock Mass Test Method Standard" requirements. A layer of plastic film 5 coated with insulating varnish is pasted between the rock sample 2 and the upper pressure plate 3 and the lower pressure plate 4 to prevent the current from being directly conducted through the rigid servo press 1 during the resistivity measurement process.

[0062] The resistivity measurement of the rock sample 2 adopts the quadrupole method, so it is necessary to arrange four b...

Embodiment 2

[0079] Embodiment 2 An acoustic and electric integrated test probe

[0080] Such as Figure 4 As shown, the outermost layer of an acoustic-electric integrated test probe is a shell 24 made of metal. On the one hand, it can increase the strength of the probe, and on the other hand, it can also shield the external high-frequency signals to prevent the acoustic emission signal from being disturbed. . Acoustic emission signal collection is realized by the piezoelectric element 20. The front end of the piezoelectric element 20 is designed in an arc shape, which can better contact with the surface of the cylinder standard rock sample 2 to facilitate acoustic emission coupling. In addition, the piezoelectric element 20 is made into a hollow cylinder, and electrode 19 stretches out from the hole in the middle. The part of the electrode 19 protruding from the housing 24 is about 8mm long, and it can just extend into the borehole 6 during the test, and the arc surface of the front end...

Embodiment 3

[0082] Embodiment 3 An acoustic-electric integrated test probe clamping device

[0083] Such as Figure 5 As shown, an acoustic-electric integrated test probe clamping device 14 is composed of a probe clamp 28 , a rotating mechanism 29 , a slide bar 30 , a main pole 31 , a hinge 32 and a base 33 . The base 33 supports the whole device and is connected with the main pole 31 . In actual use, a plurality of rotating mechanisms 29 may be installed on the main pole 31 as required, together with a slide bar 30 and a probe clamp 28, so as to realize simultaneous clamping of multiple probes.

[0084] The main pole 31 is divided into upper and lower sections again, the lower section is welded into one body with the base 33 , and the upper and lower sections are connected by a hinge 32 . The structure of the hinge 32 is as Figure 6 As shown, there are thin blocks wedging between the upper and lower sections of the main pole 31, and the thin blocks are penetrated by screws, and the t...

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Abstract

The invention discloses an acoustical emitting and resistivity joint monitoring device and a monitoring method of a fracture process of a rock specimen. According to the acoustical emitting and resistivity joint monitoring device, an electrode at the front end of an acoustical-electrical integrating testing probe on an acoustical-electrical integrating testing probe holding device is connected with a drill hole in the rock specimen; the acoustical emitting acquiring module and a resistivity acquiring module are both connected with a data processing system; the data processing system is connected with a real-time display system; the rock specimen is placed between two bearing plates of a rigid servo press; and a stress acquiring module and a strain acquiring module are both connected with the data processing system, and therefore, the acoustical emitting data, the resistivity data and the stress-strain data can be synchronously acquired in real time during the rock uniaxial compression test; and the resistivity acquiring module is used for automatically acquiring the resistivity data at ultrahigh frequency, and automatically improving the resistivity acquiring frequency after accepting feedback control, so that the resistivity variation data of the rock specimen in the fracture process can be completely acquired, and as a result, the fracture information of the rock specimen can be dynamically captured in real time.

Description

technical field [0001] The invention relates to a combined real-time monitoring device of acoustic emission and resistivity, in particular to a combined monitoring device and monitoring method of acoustic emission and resistivity in the rock sample rupture process. Background technique [0002] As we all know, rock is a very complex mechanical medium formed under long-term geological conditions. influences. However, traditional rock mechanics tests, such as uniaxial compression tests and shear tests, can only obtain parameters such as elastic modulus, Poisson's ratio, compressive strength, and shear strength, which are far from enough to describe the physical and mechanical properties of rocks. Not enough. Therefore, some scholars have introduced resistivity and acoustic emission techniques to study the fracture process of rocks. [0003] As a basic physical parameter of rock, resistivity reflects the quality of rock conductivity, and its change can directly reflect the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/14G01R27/02
Inventor 刘斌李术才许新骥刘征宇聂利超王静宋杰孙怀凤徐磊王传武郝亭宇周浩林春金
Owner SHANDONG UNIV
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