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A Test Method for Studying Instability and Failure of Rock Wedges Under High Stress

A test method and technology of rock wedges, applied in the field of rock mechanics, can solve problems such as inability to study interactions in a targeted manner, misunderstanding of rock bursts, misjudgment of rock burst danger levels, etc.

Active Publication Date: 2021-04-27
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used compression or direct shear test schemes for rock samples with single or parallel structural planes cannot simulate the occurrence conditions of this type of rockburst, and cannot specifically study the interaction between cross-combined structural planes under different stress states. It may cause misunderstanding of the actual rockburst conditions and misjudgment of the danger level of rockbursts

Method used

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  • A Test Method for Studying Instability and Failure of Rock Wedges Under High Stress
  • A Test Method for Studying Instability and Failure of Rock Wedges Under High Stress
  • A Test Method for Studying Instability and Failure of Rock Wedges Under High Stress

Examples

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Embodiment 1

[0063] A kind of test method that the present invention relates to research rock wedge-shaped body instability failure under high stress, comprises the following steps:

[0064] Step 1: The rock samples are selected from granite materials that are prone to rockbursts, and cut into rock samples with a size of 100mm×50mm×150mm (length×width×height);

[0065] Step 2: Under the conditions of Brazilian splitting, make the rock sample successively generate two intersecting structural planes with a certain angle, and the two structural planes form a "Y" shape, such as figure 2 shown in the model. In the rock sample A, the main structural plane B that runs through the entire rock sample has an angle of 45° with the horizontal plane, and the other non-penetrating secondary structural plane C has an included angle of 60° with the horizontal plane (the angle after splitting There is a deviation from the preset value, which is 52° after calibration), and the two intersecting structural ...

Embodiment 2

[0079] A kind of test method that the present invention relates to research rock wedge-shaped body instability failure under high stress, comprises the following steps:

[0080] Step 1: The rock samples are selected from granite materials that are prone to rockbursts, and cut into rock samples with a size of 100mm×50mm×150mm (length×width×height);

[0081] Step 2: Under the conditions of Brazilian splitting, make the rock sample successively generate two intersecting structural planes with a certain angle, and the two structural planes form a "Y" shape, such as figure 2 shown in the model. In rock sample A, the main structural plane B that runs through the entire rock sample has an angle of 30° with the horizontal plane, and the other non-penetrating secondary structural plane C has an included angle of 60° with the horizontal plane (the angle after splitting There is a deviation from the preset value, which is 55.4° after calibration), and the two intersecting structural pl...

Embodiment 3

[0093] A kind of test method that the present invention relates to research rock wedge-shaped body instability failure under high stress, comprises the following steps:

[0094] Step 1: The rock samples are selected from granite materials that are prone to rockbursts, and cut into rock samples with a size of 100mm×50mm×150mm (length×width×height);

[0095] Step 2: Under the conditions of Brazilian splitting, make the rock sample successively generate two intersecting structural planes with a certain angle, and the two structural planes form a "Y" shape, such as figure 2 shown in the model. In rock sample A, the main structural plane B that runs through the entire rock sample has an included angle of 25° with the horizontal plane, and the other non-penetrating secondary structural plane C has an included angle with the horizontal plane of 50° (the angle after splitting There is a deviation from the preset value, which is 47.1° after calibration), and the two intersecting stru...

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Abstract

The invention provides a test method for studying the instability and failure of a rock wedge under high stress. The test uses a uniaxial testing machine to load a "Y"-shaped cross-combined structural surface sample. Before the experiment, speckle marking points were sprayed on the surface of the sample, and the point cloud data of the two structural surfaces were scanned to obtain their JRC values. During the loading process, monitor the surface displacement field and acoustic emission signal of the "Y"-shaped cross-combined structural surface sample, and obtain the deformation and acoustic emission precursory characteristics of its instability failure; the sample is loaded to failure, and its peak normal stress is obtained According to this, the shear stress components of the two structural planes are calculated and compared with the shear strength of the structural planes. Multiple sets of tests were repeated under different structural plane JRC, angles and loading methods to investigate the shear strength, displacement field and acoustic emission signal change law of the structural plane before the failure of the rock sample, so as to establish a comprehensive analysis of the instability and failure of the rock wedge. The criterion provides a reference for early warning of rockburst disasters in rock engineering.

Description

Technical field: [0001] The invention belongs to the technical field of rock mechanics, in particular to a test method for studying the instability and failure of a rock wedge under high stress. Background technique: [0002] With the increasing scarcity of shallow energy and resources, deep mining has become an inevitable trend in the development of the world's mining industry. However, under the conditions of deep mining, the problem of rockburst disasters is prominent. Rockburst is a phenomenon of dynamic damage to surrounding rock caused by the excavation and unloading of underground engineering rock mass under the condition of high ground stress. Device security poses a huge threat. In the prior art, the schematic diagram of a rock burst occurring in a rock wedge under high stress extrusion is as follows: figure 1 shown. [0003] The repeatability of rockburst disasters is not strong. Physical experiments are used to study rockbursts in the laboratory, which has sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/30G01N3/06
CPCG01N3/06G01N3/30G01N2203/001G01N2203/0019G01N2203/0025G01N2203/0067G01N2203/0252G01N2203/0658
Inventor 刘溪鸽朱万成张鹏海刘洪磊关凯李澜堃代风
Owner NORTHEASTERN UNIV LIAONING
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