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Rock tri-axial test crack extension observation device based on electrical capacitance tomography technique

A technology of electric capacitance tomography and triaxial test, which is applied in the direction of measuring device, using stable tension/pressure to test the strength of materials, analyzing materials, etc., can solve the problem of remaking the triaxial chamber, which is time-consuming and laborious, and the CT scanner is expensive and other problems, to achieve the effect of low price, simple device structure and convenient operation

Inactive Publication Date: 2016-07-06
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two shortcomings in the application of CT scanning technology: (1) The confining pressure chamber of the triaxial testing machine needs to be modified to adapt to the CT scanner
This modification is usually time-consuming and labor-intensive, and even requires re-making the triaxial chamber
(2) The price of the CT scanner is extremely expensive, comparable to that of the triaxial testing machine

Method used

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  • Rock tri-axial test crack extension observation device based on electrical capacitance tomography technique
  • Rock tri-axial test crack extension observation device based on electrical capacitance tomography technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Taking marble as an example, the device of the present invention is used to observe the expansion of cracks in the rock sample, and the usage method is as follows:

[0036] 1. Take the marble rock specimen, the specimen is a cylindrical standard specimen, wrap the rubber sleeve 2 on the outside of the specimen, and then hoop the double-layer rubber ring 3 on the outside of the rubber sleeve 2, and the two layers of the double-layer rubber ring 3 There are 8 annular electrodes 4 distributed at equal intervals between them;

[0037] 2. Place the marble sample on the rigid indenter of the triaxial chamber 1, then place the rigid upper indenter on the top, and fasten the rubber sleeve 2 with a hoop, so that the hydraulic oil cannot enter the rubber sleeve 2 when the confining pressure is loaded. Inside;

[0038] 3. Connect the cable 9 and the connector male head between the ring electrode 4 and the data acquisition module 5 to the female head of the multi-hole cable wiring...

Embodiment 2

[0042] Taking high-porosity sandstone rock as an example, the device of the present invention is used to observe the expansion of cracks in the rock sample, and the use method is as follows:

[0043] 1. Take a standard high-porosity sandstone rock sample, as in steps 1 to 3 of Example 1, and verify the device;

[0044] 2. Install the seepage pipeline for rock seepage test, so that the triaxial test device can carry out long-term rheological test under seepage;

[0045] 3. Close the triaxial chamber 1, start the confining pressure oil pump to fill the triaxial chamber 1 with oil, and apply the confining pressure to the predetermined value;

[0046] 4. Start the water pump of the triaxial rheometer to adjust the osmotic pressure acting on the upper and lower ends of the sandstone sample, so that the infiltrated water can slowly saturate the sandstone sample under the pressure of the water pump and penetrate the rock sample;

[0047] 5. Start the axial pressure oil pump, gradual...

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Abstract

The invention discloses a rock tri-axial test crack extension observation device based on the electrical capacitance tomography technique.The observation device comprises a tri-axial test device and an electrical capacitance tomography system, wherein the tri-axial test device comprises a tri-axial chamber for placing a rock sample, a rubber sleeve for wrapping the rock sample, and a double-layer rubber ring surrounding the rubber sleeve tightly, the electrical capacitance tomography system comprises annular electrodes located between the two layers of the double-layer rubber ring and distributed in the ring direction of the double-layer rubber ring at intervals, a data acquisition module used for measuring the real-time capacitance between any two annular electrodes and converting the real-time capacitance into a capacitance digital signal, and an imaging module used for converting the capacitance digital signal into an image to be displayed, the imaging module sends out a detection digital signal, and the detection digital signal is converted into a detection electric signal through the data acquisition module to provide power for the annular electrodes.Crack extension of rock is observed with the electrical capacitance tomography technique, and visualization of the crack extension process can be achieved.

Description

technical field [0001] The invention relates to a rock fracture expansion observation device, in particular to a rock triaxial test fracture expansion observation device based on capacitance tomography technology. Background technique [0002] Rock is a porous medium, which is a two-phase body composed of solid rock skeleton and flowing pore fluid. Its mechanical properties greatly depend on the cracks existing in the rock and the fluid in the cracks. In the process of rock deformation and failure, the mechanical performance of internal fractures varies with the stress state and loading method. Or under low compressive stress, the primary cracks are compressed and closed; or under the action of low tensile stress, the primary cracks expand and split due to the stress concentration at the tip; or under the action of low shear stress, the primary cracks are torn or slipped open . No matter what the stress state and loading method are, when the applied load exceeds a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0048G01N2203/0066G01N2203/0256
Inventor 张超徐卫亚杨兰兰张久长俞隽闫龙吉华王如宾王环玲
Owner HOHAI UNIV
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