CN108344806A - A method of Rock Damage degree under blast action is calculated based on nuclear magnetic resonance - Google Patents
A method of Rock Damage degree under blast action is calculated based on nuclear magnetic resonance Download PDFInfo
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- CN108344806A CN108344806A CN201810009970.6A CN201810009970A CN108344806A CN 108344806 A CN108344806 A CN 108344806A CN 201810009970 A CN201810009970 A CN 201810009970A CN 108344806 A CN108344806 A CN 108344806A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
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- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The present invention provides a kind of method calculating Rock Damage degree under blast action based on nuclear magnetic resonance, is measured to the rock mass internal injury degree of blasting vibration influence area, and process is included in equidistantly selectes sampled point by the center of circle of quick-fried source.It takes rock specimens to be prepared into rock sample in sampled point and tests its uniaxial compressive strength, longitudinal wave velocity, nuclear magnetic resonance number etc., and concrete sample of the mechanical property range of tolerable variance 5~8% is prepared according to the mechanical property of rock sample, it is pre-buried to sampled point together with rock sample.Carry out blasting vibration data acquisition.Rock sample, concrete sample are carried out to uniaxial compressive strength, acoustic velocity test again, affecting laws of the blasting vibration to damage of rock increment are obtained further according to nuclear magnetic resonance image and lateral relaxation time, to judge rock degree of injury under the influence of different effect of vibration, explosion is instructed to design, reach low energy consumption, high efficiency bursting work, reduces influence of the blasting vibration to non-manipulating object engineering.
Description
Technical field
The test to damage of rock degree and computational methods the present invention relates to an explosion field borehole blasting vibration, especially
It is related to a kind of method that Rock Damage degree under blast action is calculated based on nuclear magnetic resonance.
Background technology
It is increasingly enhanced with the continuous deepening of research with the environmental consciousness of people, the explosion generated along with bursting work is shaken
Dynamic the problem of becoming expert, focus of attention.It studies blasting vibration to act on rock, low energy consumption bursting work not only may be implemented,
Influence of the effect of vibration to operation area periphery buildings or structures can also effectively be reduced.It is increasing in new situations, new normality
Seek blasting vibration under environmental requirement to be had a very important significance by the characterization method of bulk damage increment in rock.Fei Honglu
Deng by field survey data, the correspondence for analyzing and setting up damage variation and blasting vibration has studied blasting vibration to dew
The influence of its mine side slope.Zhu Chuanyun etc. exists《Explosion causes the method for discrimination of Rock Damage to be studied》In propose the damage of blasting vibration
Hinder method of discrimination, using the velocity of longitudinal wave size of different extent of damage rocks as measurement index, establishes Rock Damage degree D, complete
Relationship between property coefficient K and reduced rate of sonic velocity η has become the decision procedure generally accepted in the industry.
At present in blasting vibration in the research of damage of rock, how much Yan Changbin etc. characterizes explosion with blast action number
The influence variation to rock accumulated damage is acted on, variation is specifically influenced on damage of rock increment for blasting vibration and does not make carefully
Description is caused, has been lacked to each influence factor of equivalent energy, such as the analysis that vibration wave amplitude, frequency are equivalent, this will make quick-fried
Precision is moved towards in broken operation, the shortcoming in theory support occurs in the road of fining.
Blasting vibration is established to damage of rock increment assay method, the engineering on the spot in conjunction with given by geological mapping department provides
Expect that reasonable selection blasting parameter carries out operation.Not only further blasting vibration effect can be studied, while explosion is made
Industry moves towards precision, fining also has significant impetus.
Invention content
The object of the present invention is to provide a kind of methods calculating Rock Damage degree under blast action based on nuclear magnetic resonance, can
It is prejudged with the damage of rock degree to blast action influence area, and journey is damaged under the influence of different explosion doses with rock
Degree reaches low energy consumption, high efficiency, effectively reduces blasting vibration to non-Project Areas as index, guidance optimization bursting work is referred to
The influence in domain extends the purpose of engineering service life.
To achieve the above object, the present invention is realized using following technical scheme：
A method of Rock Damage degree under blast action is calculated based on nuclear magnetic resonance, is included the following steps：
1) using quick-fried source as the center of circle, equidistant selected rock specimens collection point 5~8 at the rock mass detected on the spot, every
50~100mm of diameter is drilled through at one collection point, 150~250mm of length and rock cranny width are no more than 0.5mm, and crack is deep
Degree is less than 2% rock specimens 2~3 of diameter, and numbers；
2) in the sample that each collection point drills through, a rock sample is taken to carry out sonic detection, records rock sample
Velocity of longitudinal wave vp；Nuclear magnetic resonance test is carried out to the rock sample, along test specimen it is axial equidistantly obtain 6~12 nuclear magnetic resonance at
As figure and spin spinrelaxation T2；Strength test is carried out to the rock sample, elastic modulus E and the single shaft for obtaining rock sample are anti-
Compressive Strength Rc；
3) according to acquired each collection point rock sample mechanical property parameter, according to the principle of similitude, preparation and rock sample
Concrete sample of each nature parameters range of tolerable variance 5~8%, then mechanical property test is carried out, record each power of concrete sample
Learn parameter；
4) rock sample is played back in drilling according to label, while prepared concrete sample is pre-buried in the borehole,
And using cement extrusion grouting gluing method with rock mass is cementing is fixed as one, grouting pressure is 0.3~0.4MPa；
5) blasting vibration measurement instrument is positioned over drill hole, processing is fixed to sensor, measured the measuring point explosion and shake
Time t, frequency f and the Particle Vibration Velocity v of action；
6) take out one group of pre-buried rock and concrete sample after each bursting work measures vibration data, and to test specimen into
Row mechanical property is tested, and is detected the rock sample after being acted on by blasting vibration and concrete sample nuclear magnetic resonance image and is laterally relaxed
Henan time T2, velocity of longitudinal wave vp, elastic modulus E and uniaxial tensile strength Rc；
7) all pre-buried rock samples and concrete sample are taken out one by one again and is sequentially completed vibrating data collection；
8) it presses and takes out pre-buried concrete and rock sample sequence, Data Matching is carried out in conjunction with institute's gathered data；Pass through nuclear-magnetism
Resonance data analyzes rock and concrete sample micro-variations feature after blast action, when establishing test specimen nuclear magnetic resonance transverse relaxation
Between with the matching relationship of corresponding blast action dose Q be：
Wherein a, b are respectively that quadratic term, the first order based on blasting vibration Data Matching result are fitted correction factor；C1For
Based on fit correlation constant, C2For Power-law coefficient, C3Refer to corresponding blast action dose for nuclear magnetic resonance lateral relaxation time
Several fittings adjust constant；
Define intensity characterization number α=lnRcvp, according to the v measured every timep、RcIt is corresponding to calculate intensity characterization number and final
It forms blasting vibration and system is analyzed to damage of rock effect tendency.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention is general Rock Damage Tachistoscope method, and operability is strong.Using quick-fried source as the center of circle, at equal intervals
Mode acquires rock sample, can supplement improve geologic information to a certain extent, is conducive to analysis and parameter is selected.
(2) present invention is avoided and is manually taken repeatedly using the mode of operation for gradually fetching pre-buried rock and concrete sample
Disturbance of the sample to test specimen, data are reliable.
(3) microscopic sdIBM-2+2q.p.approach data and each physical quantity of test specimen and blasting vibration effect are set up dynamic system by the present invention, can
For instructing explosion to optimize.
Description of the drawings
Fig. 1 is the acquisition of the method for the present invention rock sample and prefabricated specimen prefabricated arrangement.
In figure：1,2,3,4,5 be sampling and vibrating data collection point, and L is collection point spacing distance.
Fig. 2 is that assay method of the present invention measures flow chart.
Specific implementation mode
The present invention is described in detail below in conjunction with the accompanying drawings, it should be noted that the present invention implementation be not limited to it is following
Embodiment.
A method of Rock Damage degree under blast action is calculated based on nuclear magnetic resonance, is included the following steps：
1) using quick-fried source as the center of circle, equidistant selected rock specimens collection point 5~8 at the rock mass detected on the spot, every
50~100mm of diameter, 150~250mm of length and rock cranny macroscopic view width are drilled through at one collection point no more than 0.5mm, are split
It stitches depth and is less than 2% rock specimens 2~3 of diameter, and number, be processed into rock sample；
2) in the sample that each collection point drills through, a rock sample is taken to carry out sonic detection, records rock sample
Velocity of longitudinal wave vp；To carrying out nuclear magnetic resonance test after rock sample saturation pretreatment, 6~12 are axially equidistantly obtained along test specimen
A Magnetic resonance imaging figure and spin spinrelaxation T2；Strength test is carried out to the rock sample, obtains the elasticity of rock sample
Modulus E and uniaxial compressive strength Rc；
3) according to acquired each collection point rock sample mechanical property parameter, according to the principle of similitude, preparation and rock sample
Concrete sample of each nature parameters range of tolerable variance 5~8%, then mechanical property test is carried out, record each power of concrete sample
Learn parameter；
4) rock sample is played back in drilling according to label, while prepared concrete sample is pre-buried in the borehole,
And using cement extrusion grouting gluing method with rock mass is cementing is fixed as one, grouting pressure is 0.3~0.4MPa；
5) blasting vibration measurement instrument is positioned over drill hole, and according to blasting vibration measurement instrument operating procedure to sensor into
Row fixing process measures time t, frequency f and the Particle Vibration Velocity v of measuring point blasting vibration effect；
6) take out one group of pre-buried rock and concrete sample after each bursting work measures vibration data, and to test specimen into
Row mechanical property is tested, and is detected the rock sample after being acted on by blasting vibration and concrete sample nuclear magnetic resonance image and is laterally relaxed
Henan time T2, velocity of longitudinal wave vp, elastic modulus E and uniaxial tensile strength Rc；
7) all pre-buried rock samples and concrete sample are taken out one by one again and is sequentially completed vibrating data collection；
8) it presses and takes out pre-buried concrete and rock sample sequence, Data Matching is carried out in conjunction with institute's gathered data；Pass through nuclear-magnetism
Resonance data analyzes rock and concrete sample micro-variations feature after blast action, when establishing test specimen nuclear magnetic resonance transverse relaxation
Between with the matching relationship of corresponding blast action dose Q be：
Wherein a, b are respectively that quadratic term, the first order based on blasting vibration Data Matching result are fitted correction factor；C1For
Based on fit correlation constant, C2For Power-law coefficient, C3Refer to corresponding blast action dose for nuclear magnetic resonance lateral relaxation time
Several fittings adjust constant.
Define intensity characterization number α=lnRcvp, according to the v measured every timep、RcIt is corresponding to calculate intensity characterization number and final
It forms blasting vibration and system is analyzed to damage of rock effect tendency.
Embodiment 1：
At granite to be measured using quick-fried source as the center of circle, equidistant selected rock specimens collection point 6, and drill through diameter 60 ±
2mm, 200 ± 20mm of length meet crack macroscopic view width and are no more than 0.5mm, and the penetration of fracture is less than 2% rock specimens of diameter
3, make label.Rock specimens are processed according to test requirements document, are prepared into the rock sample for meeting testing requirement.
Mechanical property test analysis is carried out to prepared granite test specimen, is as follows：
(1) it uses RSM-SY6 foundation pile acoustics detector to carry out initial sonic waves detection to rock sample, records each sampling successively
The velocity of longitudinal wave v of the prepared rock sample of pointp；
(2) to rock sample carry out vacuum saturation processing after using MacroMR Nuclear Magnetic Resonance to rock sample into
Row nuclear magnetic resonance is tested, along test specimen axial equidistantly 8 Magnetic resonance imaging figures of acquisition and spin spinrelaxation T2；
(3) it uses pressure testing machine to carry out strength test to rock sample, obtains the elastic modulus E and single shaft of rock sample
Compression strength Rc。
According to each mechanical property parameter of each rock sample, prepares the similar concrete of each nature parameters according to correspondence theorem and try
Part carries out longitudinal wave velocity measurement, nuclear magnetic resonance test and strength test, each power of complete documentation concrete to made concrete sample
Learn nature parameters initial data.
Rock sample is played back in drilling according to label, while prepared concrete sample is embedded in corresponding drilling in advance
In, it is allowed to and rock mass is cementing is fixed as one using cement extrusion grouting gluing method.
The TC4850 blasting vibration measurement instrument debugged is placed in drill hole, and according to vialog hints on operation to sensing
Processing is fixed in device, starts effect of vibration time t, frequency f and Particle Vibration Velocity v that tester measures blast action；
After onepull operation terminates and measures vibration data, the pre-buried rock sample and concrete examination that number is 1 are taken out
Part.Mechanical property test is carried out to test specimen, measures the rock sample after being acted on by blasting vibration and concrete sample nuclear magnetic resonance
Data, velocity of longitudinal wave vp, elastic modulus E and uniaxial tensile strength Rc。
Carry out bursting work again, operation terminates to take out the pre-buried rock sample and concrete sample that number is 2, carry out with
The identical test of 1 pre-buried test specimen of number simultaneously records corresponding data.
Blasting vibration data each time are so recorded one by one, and are taken out 3,4,5,6 all pre-buried rock samples of number and mixed
Solidifying soil test specimen, carries out test identical with 1 pre-buried test specimen of number.
It completes aforesaid operations and terminates the entire data acquisition of assay method.
Match the different lower relationships between nuclear magnetic resonance lateral relaxation time of dose effect
Calculate intensity characterization number α=lnRcvp。
By magnetic resonance detection analysis after by blast action, granite and corresponding similar concrete sample variation characteristic,
Blast action is fitted to damage of rock affecting laws, and then instructs bursting work.
Embodiment 2：
At phyllite to be measured using quick-fried source as the center of circle, equidistant selected rock specimens collection point 5, and drill through diameter 60 ±
2mm, 180 ± 20mm of length meet crack macroscopic view width and are no more than 0.5mm, and the penetration of fracture is less than 2% rock specimens of diameter
3, make label.Rock specimens are processed according to test requirements document, are prepared into the rock sample for meeting testing requirement.
Mechanical property test analysis is carried out to prepared phyllite test specimen, is as follows：：
(1) it uses RSM-SY6 foundation pile acoustics detector to carry out initial sonic waves detection to rock sample, records each sampling successively
The velocity of longitudinal wave v of the prepared rock sample of pointp；
(2) to rock sample carry out vacuum saturation processing after using MacroMR Nuclear Magnetic Resonance to rock sample into
Row nuclear magnetic resonance is tested, along test specimen axial equidistantly 8 Magnetic resonance imaging figures of acquisition and spin spinrelaxation T2；
(3) it uses pressure testing machine to carry out strength test to rock sample, obtains the elastic modulus E and single shaft of rock sample
Compression strength Rc。
According to each mechanical property parameter of each rock sample, prepares the similar concrete of each nature parameters according to correspondence theorem and try
Part carries out longitudinal wave velocity measurement, nuclear magnetic resonance test and strength test, each power of complete documentation concrete to made concrete sample
Learn nature parameters initial data.
Rock sample is played back in drilling according to label, while prepared concrete sample is embedded in corresponding drilling in advance
In, it is allowed to and rock mass is cementing is fixed as one using cement extrusion grouting gluing method.
The TC4850 blasting vibration measurement instrument debugged is placed in drill hole, and according to vialog hints on operation to sensing
Processing is fixed in device, starts effect of vibration time t, frequency f and Particle Vibration Velocity v that tester measures blast action；
After onepull operation terminates and measures vibration data, the pre-buried rock sample and concrete examination that number is 1 are taken out
Part.Mechanical property test is carried out to test specimen, measures the rock sample after being acted on by blasting vibration and concrete sample nuclear magnetic resonance
Data, velocity of longitudinal wave vp, elastic modulus E and uniaxial tensile strength Rc。
Carry out bursting work again, operation terminates to take out the pre-buried rock sample and concrete sample that number is 2, carry out with
The identical test of 1 pre-buried test specimen of number simultaneously records corresponding data.
Blasting vibration data each time are so recorded one by one, and are taken out 3,4,5,6 all pre-buried rock samples of number and mixed
Solidifying soil test specimen, carries out test identical with 1 pre-buried test specimen of number.
It completes aforesaid operations and terminates the entire data acquisition of assay method.
Match the different lower relationships between nuclear magnetic resonance lateral relaxation time of dose effect
Calculate intensity characterization number α=lnRcvp。
By magnetic resonance detection analysis after by blast action, phyllite and corresponding similar concrete sample variation characteristic,
Blast action is fitted to damage of rock affecting laws, and then instructs bursting work.
Embodiment 3：
Using quick-fried source as the center of circle, equidistant selected rock specimens collection point 5 at magnetite quartzite to be measured, and drill through diameter
60 ± 2mm, 200 ± 20mm of length meet crack macroscopic view width and are no more than 0.5mm, and the penetration of fracture is less than 2% rock of diameter
3, sample, makees source label.Rock specimens are processed according to test requirements document, are prepared into the rock examination for meeting testing requirement
Part.
Mechanical property test analysis is carried out to prepared magnetite quartzite test specimen, is as follows：
(1) it uses RSM-SY6 foundation pile acoustics detector to carry out initial sonic waves detection to rock sample, records each sampling successively
The velocity of longitudinal wave v of the prepared rock sample of pointp；
(2) to rock sample carry out vacuum saturation processing after using MacroMR Nuclear Magnetic Resonance to rock sample into
Row nuclear magnetic resonance is tested, along test specimen axial equidistantly 8 Magnetic resonance imaging figures of acquisition and spin spinrelaxation T2；
(3) it uses pressure testing machine to carry out strength test to rock sample, obtains the elastic modulus E and single shaft of rock sample
Compression strength Rc。
According to each mechanical property parameter of each rock sample, prepares the similar concrete of each nature parameters according to correspondence theorem and try
Part carries out longitudinal wave velocity measurement, nuclear magnetic resonance test and strength test, each power of complete documentation concrete to made concrete sample
Learn nature parameters initial data.
Rock sample is played back in drilling according to label, while prepared concrete sample is embedded in corresponding drilling in advance
In, it is allowed to and rock mass is cementing is fixed as one using cement extrusion grouting gluing method.
The TC4850 blasting vibration measurement instrument debugged is placed in drill hole, and according to vialog hints on operation to sensing
Processing is fixed in device, starts effect of vibration time t, frequency f and Particle Vibration Velocity v that tester measures blast action；
After onepull operation terminates and measures vibration data, the pre-buried rock sample and concrete examination that number is 1 are taken out
Part.Mechanical property test is carried out to test specimen, measures the rock sample after being acted on by blasting vibration and concrete sample nuclear magnetic resonance
Data, velocity of longitudinal wave vp, elastic modulus E and uniaxial tensile strength Rc。
Carry out bursting work again, operation terminates to take out the pre-buried rock sample and concrete sample that number is 2, carry out with
The identical test of 1 pre-buried test specimen of number simultaneously records corresponding data.
Blasting vibration data each time are so recorded one by one, and are taken out 3,4,5,6 all pre-buried rock samples of number and mixed
Solidifying soil test specimen, carries out test identical with 1 pre-buried test specimen of number.
It completes aforesaid operations and terminates the entire data acquisition of assay method.
Match the different lower relationships between nuclear magnetic resonance lateral relaxation time of dose effect
Calculate intensity characterization number α=lnRcvp。
By magnetic resonance detection analysis after by blast action, magnetite quartzite and corresponding similar concrete sample variation are special
Sign, fitting blast action instruct bursting work to damage of rock affecting laws.
Embodiment 4：
At green mud rock to be measured using quick-fried source as the center of circle, equidistant selected rock specimens collection point 5, and drill through diameter 60 ±
2mm, 180 ± 20mm of length meet crack macroscopic view width and are no more than 0.5mm, and the penetration of fracture is less than 2% rock specimens of diameter
3, make label.Rock specimens are processed according to test requirements document, are prepared into the rock sample for meeting testing requirement.
Mechanical property test analysis is carried out to prepared green mud rock test specimen, is as follows：：
(1) it uses RSM-SY6 foundation pile acoustics detector to carry out initial sonic waves detection to rock sample, records each sampling successively
The velocity of longitudinal wave v of the prepared rock sample of pointp；
(2) to rock sample carry out vacuum saturation processing after using MacroMR Nuclear Magnetic Resonance to rock sample into
Row nuclear magnetic resonance is tested, along test specimen axial equidistantly 8 Magnetic resonance imaging figures of acquisition and spin spinrelaxation T2；
(3) it uses pressure testing machine to carry out strength test to rock sample, obtains the elastic modulus E and single shaft of rock sample
Compression strength Rc。
According to each mechanical property parameter of each rock sample, prepares the similar concrete of each nature parameters according to correspondence theorem and try
Part carries out longitudinal wave velocity measurement, nuclear magnetic resonance test and strength test, each power of complete documentation concrete to made concrete sample
Learn nature parameters initial data.
Rock sample is played back in drilling according to label, while prepared concrete sample is embedded in corresponding drilling in advance
In, it is allowed to and rock mass is cementing is fixed as one using cement extrusion grouting gluing method.
The TC4850 blasting vibration measurement instrument debugged is placed in drill hole, and according to vialog hints on operation to sensing
Processing is fixed in device, starts effect of vibration time t, frequency f and Particle Vibration Velocity v that tester measures blast action；
After onepull operation terminates and measures vibration data, the pre-buried rock sample and concrete examination that number is 1 are taken out
Part.Mechanical property test is carried out to test specimen, measures the rock sample after being acted on by blasting vibration and concrete sample nuclear magnetic resonance
Data, velocity of longitudinal wave vp, elastic modulus E and uniaxial tensile strength Rc。
Carry out bursting work again, operation terminates to take out the pre-buried rock sample and concrete sample that number is 2, carry out with
The identical test of 1 pre-buried test specimen of number simultaneously records corresponding data.
Blasting vibration data each time are so recorded one by one, and are taken out 3,4,5,6 all pre-buried rock samples of number and mixed
Solidifying soil test specimen, carries out test identical with 1 pre-buried test specimen of number.
It completes aforesaid operations and terminates the entire data acquisition of assay method.
Match the different lower relationships between nuclear magnetic resonance lateral relaxation time of dose effect
Calculate intensity characterization number α=lnRcvp。
By magnetic resonance detection analysis after by blast action, green mud rock and corresponding similar concrete sample variation characteristic,
Blast action is fitted to damage of rock affecting laws, and then instructs bursting work.
Claims (1)
1. a kind of method calculating Rock Damage degree under blast action based on nuclear magnetic resonance, which is characterized in that including walking as follows
Suddenly：
1) using quick-fried source as the center of circle, equidistant selected rock specimens collection point 5~8 at the rock mass detected on the spot, at each
50~100mm of diameter, 150~250mm of length and rock cranny width are drilled through at collection point no more than 0.5mm, the penetration of fracture is small
In 2% rock specimens 2~3 of diameter, and number；
2) sonic detection, record rock sample velocity of longitudinal wave v are carried out to rock samplep；Nuclear magnetic resonance survey is carried out to the rock sample
Examination, along test specimen axial equidistantly 6~12 Magnetic resonance imaging figures of acquisition and spin spinrelaxation T2；Choose one in each collection point
A rock sample carries out strength test, obtains the elastic modulus E and uniaxial compressive strength R of rock samplec；
3) it is prepared and each property of rock sample according to the principle of similitude according to acquired each collection point rock sample mechanical property parameter
Concrete sample of the matter parameter tolerances range 5~8%, then mechanical property test is carried out, each mechanics ginseng of record concrete sample
Number；
4) rock sample is played back in drilling according to label, while prepared concrete sample is pre-buried in the borehole, and adopted
With cement extrusion grouting gluing method with rock mass is cementing is fixed as one, grouting pressure is 0.3~0.4MPa；
5) blasting vibration measurement instrument is positioned over drill hole, processing is fixed to sensor, measure measuring point blasting vibration work
Time t, frequency f and Particle Vibration Velocity v；
6) one group of pre-buried rock and concrete sample are taken out after each bursting work measures vibration data, and power is carried out to test specimen
Property test is learned, when detecting the rock sample after being acted on by blasting vibration and concrete sample nuclear magnetic resonance image and transverse relaxation
Between T2, velocity of longitudinal wave vp, elastic modulus E and uniaxial tensile strength Rc；
7) all pre-buried rock samples and concrete sample are taken out one by one again and is sequentially completed vibrating data collection；
8) it presses and takes out pre-buried concrete and rock sample sequence, Data Matching is carried out in conjunction with institute's gathered data；Establish test specimen nuclear-magnetism
Resonance lateral relaxation time be with the matching relationship of corresponding blast action dose Q：
Wherein a, b are respectively that quadratic term, the first order based on blasting vibration Data Matching result are fitted correction factor；C1To be based on
Fit correlation constant, C2For Power-law coefficient, C3For nuclear magnetic resonance lateral relaxation time and corresponding blast action dose exponential term
Fitting adjustment constant；
Define intensity characterization number α=ln Rcvp, according to the v measured every timep、RcIt is corresponding to calculate intensity characterization number, and ultimately form
Blasting vibration analyzes system to damage of rock effect tendency.
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| CN113390458A (en) * | 2021-05-28 | 2021-09-14 | 鞍钢集团矿业有限公司 | Method for judging damage degree of surrounding rock in blasting area |
| CN113567495A (en) * | 2021-07-22 | 2021-10-29 | 辽宁科技大学 | Test method for solving explosive explosion energy consumption ratio based on volume method and vibration test |
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| CN114324483B (en) * | 2021-12-24 | 2023-12-15 | 鞍钢集团矿业有限公司 | Method for measuring rock damage degree under blasting disturbance |
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