Method for judging rock burst proneness of rock material

A rock material, oriented technology, applied in the direction of applying stable tension/compression to test material strength, etc., can solve problems such as overestimation and failure to consider rock plastic strain energy

Active Publication Date: 2016-07-06
CENT SOUTH UNIV
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Problems solved by technology

However, this method does not take into account the plastic strain energy consumed by the rock before reaching its peak strength, so there is a possibility of overestimation

Method used

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  • Method for judging rock burst proneness of rock material
  • Method for judging rock burst proneness of rock material
  • Method for judging rock burst proneness of rock material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] The conventional uniaxial compression test of rock and a loading and unloading experiment were carried out on the INSTRON-1346 electro-hydraulic servo material testing machine to judge the rock.

[0027] The specific process is as follows:

[0028] The diameter D of the cylindrical sample is taken as 48-51mm, and the length (thickness) L of the sample is taken as 96-102mm, that is, 2.0 times of the diameter, such as figure 1 shown. The test shall be carried out according to the following steps:

[0029] (1) Firstly, a conventional uniaxial compression test is carried out, and the sample is loaded at a displacement loading rate of 0.065 mm / min until failure, and the uniaxial compressive strength σ of the rock sample is obtained c , σ c It can be read directly according to the data obtained by the testing machine.

[0030] (2) Another 5 samples were loaded to 0.7σ at the same loading rate c , 0.75σ c , 0.8σ c , 0.85σ c , 0.9σ c , and then unloaded at 0.065mm / min,...

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Abstract

The invention discloses a method for judging the rock burst proneness of a rock material. According to the method, the dissipated energy required by burst of rock is calculated according to a stress-strain curve after the rock reaches the peak intensity; due to a one-off loading and unloading experiment on a rock test sample, a real series value (Ki) and a ratio (lambda(i)) of the elastic strain energy to the total input energy before the rock reaches the peak value are in linear relation, so that the ratio (lambda(i)) of the elastic strain energy to the total input energy when the rock reaches the peak intensity, and the total input energy U1 at the peak intensity of the rock can be calculated according to the stress-strain curve, so as to obtain the elastic deformation energy at the peak intensity of the rock. Therefore, the problem that the elastic strain energy stored therein cannot be calculated as the rock under the peak intensity cannot be unloaded in time is solved; the calculated elastic strain energy is compared with the post-peak dissipated energy to judge whether the rock material has the rockburst proneness. The invention provides a brand-new judgment method for determining the rockburst proneness of the rock material.

Description

technical field [0001] The invention relates to a method for judging rockburst tendency of rock materials. Background technique [0002] Rockburst is a common engineering geological disaster phenomenon that occurs in deep rock engineering. It has been reported in many deep mines, tunnels, hydropower and other projects that have been built at home and abroad. When a rockburst occurs, there are often phenomena such as rock chip ejection, bursting or even bursting, accompanied by strong air waves or shock waves, which pose a great threat to the safety of construction personnel and equipment on site. Rock is the carrier of rockburst disasters, and its elastic-brittleness and energy storage characteristics are the main internal factors that cause rockbursts. For this reason, how to judge whether the rock has rockburst tendency has become one of the key issues in preventing rockburst disasters. At present, many methods have been developed to judge rockburst tendency of rock mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 宫凤强李嘉维李夕兵董陇军林杭
Owner CENT SOUTH UNIV
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