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Preparation method for rock sample containing tiny and closed cracks

A technology for rock samples and fractured rock masses, which is applied in the preparation of test samples, etc., and can solve the problems of inability to make small and closed cracks

Active Publication Date: 2018-01-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that tiny and closed cracks cannot be produced in the existing cracked rock sample preparation method, the present invention provides a rock sample preparation method containing tiny and closed cracks

Method used

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  • Preparation method for rock sample containing tiny and closed cracks
  • Preparation method for rock sample containing tiny and closed cracks
  • Preparation method for rock sample containing tiny and closed cracks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of a sandstone rock sample containing a closed fracture with a dip angle of 45°C, a length of 20 mm, and a friction coefficient of 0.5 includes the following steps:

[0024] (1) Take a standard sandstone sample with a size of Φ50mm×100mm, and determine the shape and distribution of cracks in the cracked rock mass according to the requirements for preparing rock samples. Inclination angle, length l=20mm, friction coefficient μ=0.5.

[0025] (2) Cut the sandstone according to the position of the crack. A fracture with a dip angle of 45°C was obtained, and the rock sample became two pieces. Such as image 3 As shown, the solid line is the crack part, and the dotted line is the bonded part.

[0026] (3) Polish and sandblast the surface of the crack area. Since the roughness of the crack surface can be changed arbitrarily by changing the size of the polishing paste or sand grains, the specific polishing paste and sand grain size are selected so that the f...

Embodiment 2

[0030] The preparation of a fractured Huayan rock sample containing two strips with an inclination angle of 60°C, a length of 20 mm, a width of 0.2 mm, a crack spacing of 10 mm, and a friction coefficient of 0.65 includes the following steps:

[0031] (1) Take a standard granite sample with a size of Φ50mm×100mm, and determine the shape and distribution of cracks in the cracked rock mass according to the requirements for preparing rock samples. d=0.2mm, length l=20mm, crack distance D=10mm, friction coefficient μ=0.5.

[0032] (2) According to the position of the fracture, the granite rock sample is cut. Two fractures with a dip angle of 60°C were obtained, and the rock samples became three pieces. Such as Figure 4 As shown, the solid line is the crack part, and the dotted line is the bonded part.

[0033] (3) Sand blast the surface of the cracked area. The specific sand size is selected so that the friction coefficient of the processed crack surface is μ = 0.65.

[0034...

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Abstract

The invention relates to a preparation method for a rock sample containing tiny and closed cracks and belongs to the technical field of civil engineering and water conservancy and hydropower engineering. The preparation method has the advantages: the crack surface of the rock sample is exposed, so that the crack surface can be more conveniently processed and various crack variables, such as, crackcharacteristics, including crack inclined angle, width, length and roughness, in the rock sample can be more accurately controlled; the adhesion area is cut along the horizonal direction, so that theinfluence of the rock cutting on the crack can be greatly avoided and the characteristics of the rock crack can be more practically reflected; the tiny cracks can be prepared, even the closed crack rock sample can be prepared, the blank of the traditional rock preparation method incapable of preparing the tiny and closed crack rock sample is filled up and the method has significance in researching the influence of the tiny and closed cracks on the rock, spreading mechanism, and the like.

Description

technical field [0001] The invention relates to a method for preparing a rock sample containing tiny and closed cracks, and belongs to the technical fields of civil engineering, water conservancy and hydropower engineering. Background technique [0002] Rock is a natural material. Under the action of many geological activities and man-made engineering disturbance factors, a large number of joints, cracks, and microcracks have been produced inside the rock, resulting in the complexity of rock mechanical properties, and it is also the main cause of geological or engineering disasters. For example, earthquakes, landslides, rockbursts, and landslides are almost all caused by fault activity and micro-crack expansion. As the so-called embankment of a thousand miles collapses in an ant nest, the essence of rock destruction is the process of initiation, expansion, interaction and penetration of internal micro-defects. Therefore, the experimental research on the mechanism and path o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 唐世斌陈培钊
Owner DALIAN UNIV OF TECH