Rock stretching and tension-shear test device and method

A test device and rock technology, applied in the direction of testing material strength by applying stable shear force, testing material strength by applying stable tension/pressure, etc., can solve the problems of cumbersome test process, difficult operation, and low precision, and achieve The structure of the device is simple, the performance is reliable, and the accuracy is guaranteed

Pending Publication Date: 2019-07-16
CHINA THREE GORGES UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Most of the existing research results are cumbersome, difficult to operate, and the accuracy is not high, so they need to be improved urgently

Method used

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  • Rock stretching and tension-shear test device and method
  • Rock stretching and tension-shear test device and method
  • Rock stretching and tension-shear test device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] Step 1: Rock sample installation:

[0072] Such as figure 1 As shown, the rock sample 26 is a rock sample with a length × width of 115mm × 60mm. Two tunnels are arranged symmetrically to it. The diameter of the tunnel is 50mm long. The distance between the two tunnels is 5mm. There is a slit 28 parallel to the hole axis, the slit 28 is 5mm long, a pressure air bag 27 is placed in the tunnel, and a mica gasket 19 is placed in the middle of the tunnel. This rock sample 26 is the object of the present invention's test and analysis.

[0073] The sample fixing device is used to fix the rock sample 26;

[0074] The tensile stress applying device is for applying tensile stress to the rock sample 26;

[0075] The shear stress applying device is for applying shear stress to the rock sample 26;

[0076] Step 2: Application of tensile stress:

[0077] According to the tensile stress value set by the test, the above formula (3) is used Calculate the air pressure value that ne...

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Abstract

The invention relates to a rock stretching and tension-shear test device and method. Two pore canals are symmetrically arranged in a rock sample, kerfs parallel to the axis of the pore canals are reserved at the outer ends of the two pore canals, and a pressure air bag sleeves the internal portion of each pore canal. the test device also comprises a sample fixing device, a tension stress applyingdevice and a shear stress applying device, wherein the upper end of the rock sample is connected with a vertical displacement dial plate for measuring the normal displacement of the rock sample; and the side surface of the rock sample is connected with a horizontal displacement dial plate for measuring the transverse displacement of the rock sample. The rock stretching and tension-shear test device and method have the advantages of the simple and feasible structure, the reliable performance and the accurate test result.

Description

technical field [0001] The invention relates to the technical field of rock tensile and tensile-shear failure tests, in particular to a rock tensile and tensile-shear test device and method. Background technique [0002] Rock tension and tension-shear failure are common failure modes in rock mass engineering. For example: the excavation of deep caverns unloads the normal ground stress of the side wall and concentrates the tangential ground stress. When the unloading is very strong, tensile or tensile shear failure may occur. Another example is that the excavation and unloading of a rocky slope can lead to a tensile stress area on the upper slope, and the rock mass in this area is generally in a combined tension-shear stress state that is both tensioned and sheared. Another example is the landslides and earthquake landslides under the action of a large amount of self-weight, which show that the rear edge of the slope often suffers from tensile damage. Therefore, it is of gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/10G01N3/24
CPCG01N3/10G01N3/24
Inventor 邓华锋齐豫熊雨李涛段玲玲潘登支永艳
Owner CHINA THREE GORGES UNIV
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