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Method used for calculating rock damaged degree under explosion effects based on nuclear magnetic resonance

A technology of nuclear magnetic resonance and damage degree, which is applied in the analysis of nuclear magnetic resonance, material analysis through resonance, and analysis of solids using sound waves/ultrasonic waves/infrasonic waves. It can solve problems such as lack of equivalent energy and lack of theoretical support for blasting operations. To achieve the effect that is conducive to analysis and parameter selection, reliable data and strong operability

Active Publication Date: 2018-07-31
UNIV OF SCI & TECH LIAONING
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  • Application Information

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Problems solved by technology

[0003] In the current research on rock damage caused by blasting vibration, Yan Changbin et al. used the number of blasting actions to characterize the impact of blasting on the cumulative damage of rock, but did not make a detailed description of the specific impact of blasting vibration on rock damage increment. Equivalent analysis of various influencing factors of equivalent energy, such as vibration amplitude, frequency, etc., will lead to a lack of theoretical support for blasting operations on the road to precision and refinement

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  • Method used for calculating rock damaged degree under explosion effects based on nuclear magnetic resonance
  • Method used for calculating rock damaged degree under explosion effects based on nuclear magnetic resonance
  • Method used for calculating rock damaged degree under explosion effects based on nuclear magnetic resonance

Examples

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Effect test

Embodiment 1

[0040] With the explosion source as the center of the granite to be tested, 6 rock sample collection points are selected at equal intervals, and the diameter is 60±2mm, the length is 200±20mm, and the macroscopic width of the crack is not more than 0.5mm, and the crack depth is less than 2% of the diameter. 3 rock samples, marked. According to the test requirements, the rock samples are processed to prepare rock specimens that meet the test requirements.

[0041] The mechanical properties of the prepared granite specimens were tested and analyzed, and the specific steps were as follows:

[0042](1) Use RSM-SY6 Pile Acoustic Detector to conduct initial acoustic wave detection on rock specimens, and record the longitudinal wave velocity v of rock specimens prepared at each sampling point in turn p ;

[0043] (2) After performing vacuum saturation treatment on the rock specimen, the MacroMR nuclear magnetic resonance instrument is used to conduct nuclear magnetic resonance test...

Embodiment 2

[0056] At the phyllite to be tested, take the explosion source as the center of the circle and select 5 rock sample collection points at equal intervals, and drill a diameter of 60±2mm and a length of 180±20mm, satisfying the requirement that the macroscopic width of the crack does not exceed 0.5mm, and the depth of the crack is smaller than the diameter. 3 samples of 2% rock, marked. According to the test requirements, the rock samples are processed to prepare rock specimens that meet the test requirements.

[0057] The mechanical properties of the prepared phyllite specimens were tested and analyzed, and the specific steps were as follows:

[0058] (1) Use RSM-SY6 Pile Acoustic Detector to conduct initial acoustic wave detection on rock specimens, and record the longitudinal wave velocity v of rock specimens prepared at each sampling point in turn p ;

[0059] (2) After performing vacuum saturation treatment on the rock specimen, the MacroMR nuclear magnetic resonance inst...

Embodiment 3

[0072] With the explosion source as the center of the magnetite quartzite to be tested, 5 rock sample collection points are selected at equal intervals, and the diameter is 60±2mm, the length is 200±20mm, and the macroscopic width of the crack is not more than 0.5mm, and the crack depth is smaller than the diameter. 3 rock samples of 2% are marked. According to the test requirements, the rock samples are processed to prepare rock specimens that meet the test requirements.

[0073] The mechanical properties of the prepared magnetite quartzite specimens were tested and analyzed, and the specific steps were as follows:

[0074] (1) Use RSM-SY6 Pile Acoustic Detector to conduct initial acoustic wave detection on rock specimens, and record the longitudinal wave velocity v of rock specimens prepared at each sampling point in turn p ;

[0075] (2) After performing vacuum saturation treatment on the rock specimen, the MacroMR nuclear magnetic resonance instrument is used to conduct ...

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Abstract

The invention provides a method used for calculating rock damaged degree under explosion effects based on nuclear magnetic resonance. The method is used for measuring internal damage degree of rock inexplosion vibration influenced regions. The method comprises following steps: sampling points at equal intervals are selected taking an explosion source as a circle center; rock samples are collectedat the sampling points, and are prepared into rock test pieces to test the uniaxial compressive strength, the longitudinal wave velocity, and the nuclear magnetic resonance times; cement test pieceswith a mechanical property tolerance range ranging from 5 to 8% are prepared based on the mechanical properties of the rock test pieces, the cement test pieces and the rock test pieces are subjected to pre-embedding at sampling points, and explosion vibration data acquisition is carried out; the rock test pieces and the cement test pieces are subjected to uniaxial compressive strength test and acoustic wave velocity test; influence laws of explosion vibration on rock damage increment are obtained based on nuclear magnetic resonance images and the transverse relaxation time so that rock damagedegree under different explosion vibration effects is determined, explosion design is guided, low energy consumption and high efficiency explosion operation are realized, and influences of explosion vibration on non-action object engineering are reduced.

Description

technical field [0001] The invention relates to a method for testing and calculating the damage degree of rock caused by blasting vibration in the field of blasting, in particular to a method for calculating the damage degree of rock mass under blasting action based on nuclear magnetic resonance. Background technique [0002] With the continuous deepening of research and the increasing awareness of environmental protection, the blasting vibration generated by blasting operations has become a problem that experts and scholars pay attention to. Studying the effect of blasting vibration on rock can not only realize low-energy blasting operations, but also effectively reduce the impact of vibration on surrounding buildings (structures) in the operation area. It is of great significance to seek the characterization means of blasting vibration damage growth in rock receptors under the new situation and the new normal environment with increasing environmental protection requirement...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N24/08G01N3/08
CPCG01N3/08G01N24/081G01N29/07G01N2203/0016
Inventor 徐振洋郭连军潘博李小帅王雪松宁玉滢
Owner UNIV OF SCI & TECH LIAONING
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