CN109597120A - A kind of method of acoustic emission experiment seismic source location under laboratory scale - Google Patents
A kind of method of acoustic emission experiment seismic source location under laboratory scale Download PDFInfo
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- CN109597120A CN109597120A CN201910015733.5A CN201910015733A CN109597120A CN 109597120 A CN109597120 A CN 109597120A CN 201910015733 A CN201910015733 A CN 201910015733A CN 109597120 A CN109597120 A CN 109597120A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002474 experimental method Methods 0.000 title claims abstract description 12
- 230000035939 shock Effects 0.000 claims abstract description 79
- 239000011435 rock Substances 0.000 claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 230000006378 damage Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 230000006854 communication Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
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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
- G01N29/14—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 using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/288—Event detection in seismic signals, e.g. microseismics
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- Acoustics & Sound (AREA)
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of methods of acoustic emission experiment seismic source location under laboratory scale, coal and rock is first processed into cylindrical sample, it is then based on the sample and establishes its internal polar coordinate system, eight shock sensors are arranged to the double-deck circulating type after the completion, it is pasted on coal petrography sample surface, and the coordinate of each shock sensor is demarcated respectively, form multiple stereoscopic monitoring networks, coal petrography sample is carried out in load failure test, the stress wave and feedback that shock sensor acquisition receives, then the positioning of focus micro rupture is carried out using specific polar coordinates location algorithm according to feedback information, cranny development inside comprehensive monitoring cylinder style.The present invention shortens the distance between acoustic emission source and shock sensor, wave is avoided, since energy attenuation causes the missing of signal, to effectively improve the accuracy of seismic source location in communication process by constructing multiple stereoscopic monitoring nets.
Description
Technical field
The present invention relates to a kind of method of acoustic emission experiment seismic source location, sound emission is real under specifically a kind of laboratory scale
The method for testing seismic source location.
Background technique
Coal and rock acoustic emission monitor(ing) usually monitors AE signal of rock mass during loaded, differentiates rock by post-processing
The stress and degree of impairment of body.And for studying coal and rock internal injury, most directly effective method is exactly to pass through arrangement sound to send out
Sensor is penetrated to position the position of rock mass internal rupture during loaded (i.e. internal hypocentral location).In order to determine internal rupture
Position, it is therefore desirable to accurate location algorithm, the acoustic emission sensor of high sensitivity and reasonable sensor arrangement, three
Error could be reduced by combining, and hypocentral location inside the positioning rock mass of maximal accuracy determines Rock Damage situation.Grinding in recent years
Study carefully achievement all and be and concentrates on improving Acoustic Emission location algorithm and improve in acoustic emission sensor sensitivity, and acoustic emission sensor cloth
The reasonability of the validity and monitoring result that collect data can be largely affected by by setting mode also, be developed to rock fracture
And the research destroyed is of great significance.Currently, in the small-scale experiment of laboratory, the arrangement of acoustic emission sensor arbitrarily and
Single, not in same plane, this arrangement does not account for stress wave and is being propagated through basic at least four sensors that only meet
Signal deletion caused by decaying in journey；What in addition seismic source location relied on is that focus coordinate derived from acoustic emission system is positioned,
Acoustic emission system positioning is space right-angle polar coordinate system positioning mode, and default stress wave is straightline propagation, therefore according to existing
It is larger that sensor distribution method will lead to position error, and it is low to eventually lead to setting accuracy.
Summary of the invention
It is fixed that in view of the above existing problems in the prior art, the present invention provides acoustic emission experiment focus under a kind of laboratory scale
The method of position shortens the distance between acoustic emission source and shock sensor, wave is avoided to pass by constructing multiple stereoscopic monitoring nets
Since energy attenuation causes the missing of signal during broadcasting, the accuracy of seismic source location is effectively improved.
To achieve the goals above, the technical solution adopted by the present invention is that: acoustic emission experiment shakes under a kind of laboratory scale
The method of source positioning, specific steps are as follows:
A, colliery scene acquire coal and rock, then by collection in worksite to coal and rock be processed into cylindrical sample, it is described
The diameter of cylindrical sample is 2r0, it is highly h0；
B, polar coordinate system is established inside cylindrical sample, horizontal plane cylindrical sample being placed on vertically in chamber
On, selection cylindrical sample central point O is polar origin, and the above are positive directions for O point, and the following are negative directions；Eight vibrations pass
Sensor is divided into shock sensor group I and shock sensor group II, and wherein shock sensor group I is in O point or more, and vibration passes
Four shock sensors in sensor group I are in same around the periphery and each shock sensor for being pasted onto cylindrical sample
Horizontal plane；Shock sensor group II is in O point hereinafter, four shock sensors in shock sensor group II surround and are pasted onto circle
The periphery of cylindricality sample and each shock sensor is in same level；Then it is determined respectively under the polar coordinate system of foundation
The location of eight shock sensors coordinate；
C, eight shock sensors are connected with sound emission host, sound emission host and coal petrography sample loading experiment machine is same
Step is opened, and Rock Mechanics Test is carried out；
D, the stress wave received is passed to sound emission host by eight shock sensors, is then exported to sound emission host
Wave file carry out mark wave, at the time of determining that each shock sensor receives source signal, determine it according to following formula
Focus coordinate (r, θ, h):
Above formula (1), (2), in (3): θ is the center of circle of horizontal plane where focus and focal point line and polar axis in the horizontal plane
The angle of projection, h are vertical height of the focus relative to central point O, and r is horizontal distance of the focus relative to central point O, Δ
t12、Δt13、Δt14、Δt15For the reception for receiving rear four shock sensors in first five shock sensor of stress wave moment
Moment receives the difference between the shock sensor time of reception of stress wave with first respectively, and v is before testing to cylinder
The stress wave that shape sample testing obtains is averaged velocity of wave, λ1It is shock sensor group I apart from cylindrical sample top distance and cylinder
Shape specimen height h0Ratio, λ2It is shock sensor group II apart from cylindrical sample bottom end distance and cylindrical sample height h0
Ratio；
E, the resulting focus coordinate of step D is subjected to seismic source location, finally obtains the shake during coal petrography sample damage and failure
Source micro rupture positioning figure.
Further, the position coordinates of four shock sensors in the step B in determining shock sensor group I are respectively
(r0,0,λ1h0)、(r0,π,λ1h0)、Determine that four vibrations in shock sensor group II pass
The position coordinates of sensor are respectively (r0,0,-λ2h0)、(r0,π,-λ2h0)、It is sat in pole
Polar axis in mark system is to issue from central point O and towards coordinate points (r0,0,λ1h0) horizontal line.
Further, the ratio λ1With ratio λ2Value range be 10%~35%.
Compared with existing shock sensor arrangement, the present invention is using the shock sensor arrangement based on polar coordinates algorithm
Mode, any 5 shock sensors in eight shock sensors of use (i.e. the practical focus coordinate of distance recently 5) can
A stereoscopic monitoring network is constructed, so that the present invention enough can construct multiple stereoscopic monitoring networks, so that its monitoring range
Entire cylindrical sample can be covered, the distance between position and shock sensor of acoustic emission source is highly shortened, avoids
Wave is in communication process since energy attenuation causes the missing of signal.In addition the present invention is fixed using polar coordinates algorithm progress focus
Position, is calculated by the arrival time difference that original wave file calculates first five shock sensor, is led compared to acoustic emission system
Out as a result, it is more accurate to the positioning result of the position of internal rupture (i.e. internal hypocentral location).
Detailed description of the invention
Fig. 1 is the position layout diagram of eight shock sensors in the present invention.
Specific embodiment
The present invention will be further described below.
As shown in Figure 1, specific steps of the invention are as follows:
A, colliery scene acquire coal and rock, then by collection in worksite to coal and rock be processed into cylindrical sample, it is described
The diameter of cylindrical sample is 2r0, it is highly h0；
B, polar coordinate system is established inside cylindrical sample, horizontal plane cylindrical sample being placed on vertically in chamber
On, selection cylindrical sample central point O is polar origin, and the above are positive directions for O point, and the following are negative directions；Eight vibrations pass
Sensor is divided into shock sensor group I and shock sensor group II, and wherein shock sensor group I is in O point or more, and vibration passes
Four shock sensors in sensor group I are in same around the periphery and each shock sensor for being pasted onto cylindrical sample
Horizontal plane；Shock sensor group II is in O point hereinafter, four shock sensors in shock sensor group II surround and are pasted onto circle
The periphery of cylindricality sample and each shock sensor is in same level；Then it is determined respectively under the polar coordinate system of foundation
The location of eight shock sensors coordinate；
C, eight shock sensors are connected with sound emission host, sound emission host and coal petrography sample loading experiment machine is same
Step is opened, and Rock Mechanics Test is carried out；
D, the stress wave received is passed to sound emission host by eight shock sensors, is then exported to sound emission host
Wave file carry out mark wave, at the time of determining that each shock sensor receives source signal, determine it according to following formula
Focus coordinate (r, θ, h):
Above formula (1), (2), in (3): θ is the center of circle of horizontal plane where focus and focal point line and polar axis in the horizontal plane
The angle of projection, h are vertical height of the focus relative to central point O, and r is horizontal distance of the focus relative to central point O, Δ
t12、Δt13、Δt14、Δt15For the reception for receiving rear four shock sensors in first five shock sensor of stress wave moment
Moment receives the difference between the shock sensor time of reception of stress wave with first respectively, and v is before testing to cylinder
The stress wave that shape sample testing obtains is averaged velocity of wave, λ1It is shock sensor group I apart from cylindrical sample top distance and cylinder
Shape specimen height h0Ratio, λ2It is shock sensor group II apart from cylindrical sample bottom end distance and cylindrical sample height h0
Ratio；
E, the resulting focus coordinate of step D is subjected to seismic source location, finally obtains the shake during coal petrography sample damage and failure
Source micro rupture positioning figure.
Further, it is 1,2,3,4 that four shock sensors are numbered respectively in determining shock sensor group I in the step B,
And its position coordinates is respectively (r0,0,λ1h0)、(r0,π,λ1h0)、Determine shock sensor
It is 5,6,7,8 that four shock sensors are numbered respectively in group II, and its position coordinates is respectively (r0,0,-λ2h0)、(r0,π,-λ2h0)、Polar axis in polar coordinate system is from central point O sending and direction
Coordinate points (r0,0,λ1h0) horizontal line；H is determined according to size needed for testing0And r0Occurrence.
Further, the ratio λ1With ratio λ2Value range be 10%~35%.
Claims (3)
1. a kind of method of acoustic emission experiment seismic source location under laboratory scale, which is characterized in that specific steps are as follows:
A, colliery scene acquire coal and rock, then by collection in worksite to coal and rock be processed into cylindrical sample, the cylinder
The diameter of shape sample is 2r0, it is highly h0；
B, polar coordinate system is established inside cylindrical sample, cylindrical sample is placed on vertically on the horizontal plane in chamber,
Selection cylindrical sample central point O is polar origin, and the above are positive directions for O point, and the following are negative directions；Eight shock sensors
It is divided into shock sensor group I and shock sensor group II, wherein shock sensor group I is in O point or more, shock sensor
Four shock sensors in group I are in same level around the periphery and each shock sensor for being pasted onto cylindrical sample
Face；Shock sensor group II is in O point hereinafter, four shock sensors in shock sensor group II surround and are pasted onto cylinder
The periphery of sample and each shock sensor is in same level；Then eight are determined respectively under the polar coordinate system of foundation
The location of shock sensor coordinate；
C, eight shock sensors are connected with sound emission host, by sound emission host and coal petrography sample loading experiment machine synchronize open
It opens, carries out Rock Mechanics Test；
D, the stress wave received is passed to sound emission host by eight shock sensors, then to wave derived from sound emission host
Shape files carry out mark wave, at the time of determining that each shock sensor receives source signal, determine its focus according to following formula
Coordinate (r, θ, h):
Above formula (1), (2), in (3): θ is that the center of circle of horizontal plane where focus and focal point line and polar axis are projected in the horizontal plane
Angle, h be vertical height of the focus relative to central point O, r be horizontal distance of the focus relative to central point O, Δ t12、Δ
t13、Δt14、Δt15For the time of reception point for receiving rear four shock sensors in first five shock sensor of stress wave moment
The difference between the shock sensor time of reception of stress wave is not received with first, v is before testing to cylindrical sample
It tests the stress wave that obtains to be averaged velocity of wave, λ1It is shock sensor group I apart from cylindrical sample top distance and cylindrical sample
Height h0Ratio, λ2It is shock sensor group II apart from cylindrical sample bottom end distance and cylindrical sample height h0Ratio；
E, the resulting focus coordinate of step D is subjected to seismic source location, the focus finally obtained during coal petrography sample damage and failure is micro-
Rupture positioning figure.
2. the method for acoustic emission experiment seismic source location under a kind of laboratory scale according to claim 1, which is characterized in that
The position coordinates that four shock sensors in shock sensor group I are determined in the step B are respectively (r0,0,λ1h0)、(r0,π,λ1h0)、Determine the position of four shock sensors in shock sensor group II
Coordinate is respectively (r0,0,-λ2h0)、(r0,π,-λ2h0)、Pole in polar coordinate system
Axis is to issue from central point O and towards coordinate points (r0,0,λ1h0) horizontal line.
3. the method for acoustic emission experiment seismic source location under a kind of laboratory scale according to claim 1, which is characterized in that
The ratio λ1With ratio λ2Value range be 10%~35%.
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| CN101788683A (en) * | 2009-12-29 | 2010-07-28 | 华东师范大学 | Tsunami motion forecasting method based on multi-hierarchy interaction |
| US20100329078A1 (en) * | 2009-06-29 | 2010-12-30 | Westerngeco Llc | Interpolation and/or extrapolation of seismic data |
| CN102129063A (en) * | 2010-12-23 | 2011-07-20 | 中南大学 | Method for positioning micro seismic source or acoustic emission source |
| CN102435980A (en) * | 2011-09-15 | 2012-05-02 | 中南大学 | Analytical solution-based acoustic emission source or micro seismic source positioning method |
| CN105675724A (en) * | 2016-01-29 | 2016-06-15 | 中国矿业大学 | Acoustic emission positioning monitoring device and method for hydraulic fracturing fissure field of coal body containing gas |
| CN107290722A (en) * | 2017-06-29 | 2017-10-24 | 中国石油大学(北京) | The localization method and device of microquake sources |
| CN109033607A (en) * | 2018-07-19 | 2018-12-18 | 山东科技大学 | A kind of optimization method of microseism seismic source location parameter |
-
2019
- 2019-01-08 CN CN201910015733.5A patent/CN109597120A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100329078A1 (en) * | 2009-06-29 | 2010-12-30 | Westerngeco Llc | Interpolation and/or extrapolation of seismic data |
| CN101788683A (en) * | 2009-12-29 | 2010-07-28 | 华东师范大学 | Tsunami motion forecasting method based on multi-hierarchy interaction |
| CN102129063A (en) * | 2010-12-23 | 2011-07-20 | 中南大学 | Method for positioning micro seismic source or acoustic emission source |
| CN102435980A (en) * | 2011-09-15 | 2012-05-02 | 中南大学 | Analytical solution-based acoustic emission source or micro seismic source positioning method |
| CN105675724A (en) * | 2016-01-29 | 2016-06-15 | 中国矿业大学 | Acoustic emission positioning monitoring device and method for hydraulic fracturing fissure field of coal body containing gas |
| CN107290722A (en) * | 2017-06-29 | 2017-10-24 | 中国石油大学(北京) | The localization method and device of microquake sources |
| CN109033607A (en) * | 2018-07-19 | 2018-12-18 | 山东科技大学 | A kind of optimization method of microseism seismic source location parameter |
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Application publication date: 20190409 |