CN106053607B - Coal sample ultrasonic wave dominant frequency detection device and method under a kind of three factors influence - Google Patents
Coal sample ultrasonic wave dominant frequency detection device and method under a kind of three factors influence Download PDFInfo
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- CN106053607B CN106053607B CN201610324295.7A CN201610324295A CN106053607B CN 106053607 B CN106053607 B CN 106053607B CN 201610324295 A CN201610324295 A CN 201610324295A CN 106053607 B CN106053607 B CN 106053607B
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- ultrasonic wave
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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
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
Abstract
The invention discloses the coal sample ultrasonic wave dominant frequency detection device and method under a kind of three factor influences, the high pressure gas gas cylinder is arranged side outside the enclosure and is connected by add drop pressure valve and box house perforation；The coal sample mounting table is fixed on bottom in cabinet, and top of the box corresponding with coal sample mounting table offers through-hole, and the through-hole is equipped with the sealing piston adaptable with it；The ultrasonic excitation probe and ultrasonic wave receiving transducer are symmetricly set on box house, and ultrasonic excitation probe and ultrasonic wave receiving transducer pass through spring supporting bar respectively and connect with box inside wall；The ultrasonic wave detector is electrically connected with ultrasonic excitation probe and ultrasonic wave receiving transducer respectively by connecting line.The actual conditions of deep underground coal body can be simulated, to obtain the response characteristic of dominant frequency under three factor coupling influence of crustal stress, gas pressure and coal physico-mechanical properties, provide basic technology guidance convenient for coal and gas prominent prevention.
Description
Technical field
A kind of coal sample the present invention relates to coal sample dominant frequency detection device and method, under specifically a kind of three factors influence
Ultrasonic wave dominant frequency detection device and method.
Background technique
In recent years, coal mine gas explosion sharp fall, but gas major accident number and total toll year by year, still
The total accident of Zhan rise it is several and death toll most, gas preventing and control is the most important thing of Safety of Coal Mine Production work；Especially China's coal
Mine mining depth increases year by year, and it is more than that the coal mine of km such as has 47, and be mainly distributed on East China at the emphasis coal that the current country, which is adopted deep,
Charcoal base area.The increasing of coal mining depth causes crustal stress to increase, and the original gas pressure in coal seam increases, low intensive construction
Coal body outburst hazard is also incrementally increasing, and the coal rock dynamic disasters such as coal and gas prominent is caused to take place frequently, serious to restrict coal mine peace
Overall height effect production.
There is provided index parameter using active seismical technique for coal and gas prominent prevention is deep fractures safe working
The developing direction of basic research.The intracorporal dominant frequency measurement of coal is a determinant attribute parameter of active seismic survey, crustal stress, watt
This pressure and coal physico-mechanical properties are conclusive three factors of coal and gas prominent, therefore utilizing active seismical technique is coal
Prevent to provide the necessary system research crustal stress of index parameter, three factor coupling of gas pressure and coal physico-mechanical properties with Gas Outburst
The response characteristic of dominant frequency under the influence of conjunction.Currently, related scholar considers that single factor test is more, ultrasound in coal sample under such as different stress conditions
The response characteristic of ultrasonic wave dominant frequency, lacks under three conditions in the response characteristic of wave dominant frequency, different physico-mechanical properties coal samples
Dominant frequency response characteristic, there are limitations for result of study, cannot simulate the actual conditions of deep underground coal body well；And it is ultrasonic
Wave dominant frequency can delicately reflect (such as in daily life, the container of different scale waters of medium difference characteristic under different condition
The sound dominant frequency otherness of presentation is big), therefore study ultrasonic wave dominant frequency and be of great significance.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides the coal sample ultrasonic waves under a kind of three factor influences
Dominant frequency detection device and method, can simulate the actual conditions of deep underground coal body, to obtain crustal stress, gas pressure and coal
The response characteristic of dominant frequency under three factor coupling influence of physico-mechanical properties provides basic technology convenient for coal and gas prominent prevention
Guidance.
To achieve the goals above, the technical solution adopted by the present invention is that: coal sample under three factor influence of this kind is super
Sound wave dominant frequency detection device, including cabinet, high pressure gas gas cylinder, coal sample mounting table, ultrasonic excitation probe, ultrasonic wave are received and are visited
Head and ultrasonic wave detector,
The high pressure gas gas cylinder is arranged side outside the enclosure and is connected by add drop pressure valve and box house perforation；
The coal sample mounting table is fixed on bottom in cabinet, and top of the box corresponding with coal sample mounting table offers logical
Hole, the through-hole are equipped with the sealing piston adaptable with it；
Ultrasonic excitation probe and ultrasonic wave receiving transducer are symmetricly set on box house, ultrasonic excitation probe and
Ultrasonic wave receiving transducer passes through spring supporting bar respectively and connect with box inside wall；
The ultrasonic wave detector is electrically connected with ultrasonic excitation probe and ultrasonic wave receiving transducer respectively by connecting line.
Further, the spring supporting bar is strong decaying spring supporting bar；Hair can avoid using strong decaying spring supporting bar
The ultrasonic wave penetrated is propagated to the periphery by spring supporting bar, guarantees that the signal propagation path obtained is that ultrasonic excitation probe passes through
Coal sample is transmitted to through ultrasonic wave receiving transducer, to improve the accuracy of ultrasonic measurement.
A kind of coal sample ultrasonic wave dominant frequency detection method under three factors influence, specific steps are as follows:
A, select it is multiple between each other with different physico-mechanical properties coal samples (the different coal body of such as hardness), as to
Survey coal sample；
B, a coal sample to be measured in step A is placed on to the coal sample mounting table of box house by the through-hole of top of the box
On, ultrasonic excitation probe and ultrasonic wave receiving transducer pass through the two sides that spring supporting bar is symmetrically fitted in coal sample to be measured；
C, sealing piston is pressed into cabinet by through-hole, its bottom end and the upper end of coal sample to be measured is made to be in contact；
D, stress loading is carried out to the top of sealing piston, so that sealing piston is applied stress to coal sample to be measured, passes through simultaneously
Add drop pressure valve is filled with methane gas to box house, and ultrasonic wave detector makes ultrasonic excitation probe issue ultrasonic wave, ultrasonic wave
It is detected by ultrasonic wave receiving transducer after coal sample to be measured and is returned ultrasonic wave detector and recorded；
E, the pressure size of methane gas, ultrasonic wave detector are filled with by the stress intensity and box house that adjust load
It is recordable under various parameters, the ultrasonic wave dominant frequency situation of change of the coal sample to be measured；
F, after the completion, first methane gas is unloaded, and then opens sealing piston, the coal sample measured is taken out, then repeats
Step B~E；
G, by under various parameters, the ultrasonic wave dominant frequency situation of change of each coal sample using single argument, divided one by one by screening method
Analysis finally show that physico-mechanical properties, stress loading and gas pressure influence situation to the dominant frequency that ultrasonic wave is propagated in coal sample.
Compared with prior art, the present invention is different from gas pressure size and replacement by the stress intensity for adjusting load
The experimental condition of the coal body of physico-mechanical properties obtains the situation of change of the ultrasonic wave dominant frequency in coal sample in all cases, from
And ultrasonic wave dominant frequency characteristic under the influence of whole conclusive three factor of consideration coal and gas prominent, prevent for coal and gas prominent
Basic technology guidance is provided.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
In figure: 1, sealing piston, 2, cabinet, 3, add drop pressure valve, 4, high pressure gas gas cylinder, 5, ultrasonic wave receiving transducer, 6,
Coal sample mounting table, 7, ultrasonic excitation probe, 8, spring supporting bar, 9, ultrasonic wave detector.
Specific embodiment
The invention will be further described below.
As shown in Figure 1, the inventive system comprises cabinet 2, high pressure gas gas cylinder 4, coal sample mounting tables 6, ultrasonic excitation
Probe 7, ultrasonic wave receiving transducer 5 and ultrasonic wave detector 9,
The setting of high pressure gas gas cylinder 4 is connect in 2 outside of cabinet and by add drop pressure valve 3 with 2 internal run-through of cabinet；
The coal sample mounting table 6 is fixed on bottom in cabinet 2, offers at the top of cabinet 2 corresponding with coal sample mounting table 6
Through-hole, the through-hole are equipped with the sealing piston 1 adaptable with it；
The ultrasonic excitation probe 7 and ultrasonic wave receiving transducer 5 are symmetricly set on inside cabinet 2, and ultrasonic excitation is visited
First 7 and ultrasonic wave receiving transducer 5 connect with 2 inner sidewall of cabinet by spring supporting bar 8 respectively；
The ultrasonic wave detector 9 is electrically connected with ultrasonic excitation probe 7 and ultrasonic wave receiving transducer 5 respectively by connecting line
It connects.
As an improvement of the present invention, the spring supporting bar 8 is strong decaying spring supporting bar；Using strong decaying spring
The ultrasonic wave that support rod can avoid transmitting is propagated to the periphery by spring supporting bar 8, guarantees that the signal propagation path obtained is super
Sound wave excitation probe 7 is transmitted to through ultrasonic wave receiving transducer 5 by coal sample, to improve the accurate of ultrasonic wave dominant frequency measurement
Degree.
Method specific steps of the invention are as follows:
A, select it is multiple between each other with different physico-mechanical properties coal samples (the different coal body of such as hardness), as to
Survey coal sample；
B, a coal sample to be measured in step A the coal sample inside cabinet 2 is placed on by the through-hole at 2 top of cabinet to place
On platform 6, ultrasonic excitation probe 7 and ultrasonic wave receiving transducer 5 pass through spring supporting bar 8 and are symmetrically fitted in the two of coal sample to be measured
Side；
C, sealing piston 1 is pressed into cabinet 2 by through-hole, its bottom end and the upper end of coal sample to be measured is made to be in contact；
D, stress loading is carried out to the top of sealing piston 1, sealing piston 1 is made to apply stress to coal sample to be measured, led to simultaneously
Cross add drop pressure valve 3 makes ultrasonic excitation probe 7 issue ultrasonic waves to methane gas, ultrasonic wave detector 9 is filled with inside cabinet 2,
Ultrasonic wave is detected by ultrasonic wave receiving transducer 5 after coal sample to be measured and is returned ultrasonic wave detector 9 and recorded；
E, the pressure size of methane gas, ultrasonic listening are filled with inside the stress intensity and cabinet 2 by adjusting load
Instrument 9 is recordable under various parameters, the ultrasonic wave dominant frequency situation of change of the coal sample to be measured；
F, after the completion, first methane gas is unloaded, and then opens sealing piston 1, the coal sample measured is taken out, then repeats
Step B~E；
G, by under various parameters, the ultrasonic wave dominant frequency situation of change of each coal sample using single argument, divided one by one by screening method
Analysis finally show that physico-mechanical properties, stress loading and gas pressure influence situation to the dominant frequency that ultrasonic wave is propagated in coal sample.
Claims (2)
1. the coal sample ultrasonic wave dominant frequency detection method under a kind of three factor influences, which is characterized in that the coal sample ultrasound of use
Wave dominant frequency detection device includes cabinet (2), high pressure gas gas cylinder (4), coal sample mounting table (6), ultrasonic excitation probe (7), surpasses
Acoustic receiver probe (5) and ultrasonic wave detector (9), high pressure gas gas cylinder (4) setting is on the outside of cabinet (2) and passes through
Add drop pressure valve (3) is connect with cabinet (2) internal run-through；The coal sample mounting table (6) is fixed on cabinet (2) interior bottom, with coal sample
Through-hole is offered at the top of the corresponding cabinet (2) of mounting table (6), the through-hole is equipped with the sealing piston (1) adaptable with it；
The ultrasonic excitation probe (7) and ultrasonic wave receiving transducer (5) are symmetricly set on cabinet (2) inside, ultrasonic excitation probe
(7) it is connect respectively by spring supporting bar (8) with cabinet (2) inner sidewall with ultrasonic wave receiving transducer (5)；The ultrasonic listening
Instrument (9) is electrically connected with ultrasonic excitation probe (7) and ultrasonic wave receiving transducer (5) respectively by connecting line；Specific steps are as follows:
A, multiple coal samples between each other with different physico-mechanical properties are selected, as coal sample to be measured；
B, a coal sample to be measured in step A the internal coal sample of cabinet (2) is placed on by the through-hole at the top of cabinet (2) to place
On platform (6), ultrasonic excitation probe (7) and ultrasonic wave receiving transducer (5) pass through spring supporting bar (8) and are symmetrically fitted in coal to be measured
The two sides of sample；
C, by sealing piston (1) by making its bottom end and the upper end of coal sample to be measured be in contact in through-hole indentation cabinet (2)；
D, stress loading carried out to the top of sealing piston (1), while by add drop pressure valve (3) to being filled with inside cabinet (2) watt
This gas, ultrasonic wave detector (9) make ultrasonic excitation probe (7) issue ultrasonic wave, and ultrasonic wave is surpassed after coal sample to be measured
Acoustic receiver probe (5) detects and returns ultrasonic wave detector (9) and recorded；
E, the pressure size of methane gas, ultrasonic wave detector are filled with inside the stress intensity and cabinet (2) by adjusting load
(9) it is recordable under various parameters, the ultrasonic wave dominant frequency situation of change of the coal sample to be measured；
F, after the completion, first methane gas is unloaded, and then opens sealing piston (1), takes out the coal sample measured, then repeats to walk
Rapid B~E；
G, by under various parameters, the ultrasonic wave dominant frequency situation of change of each coal sample using single argument, analyzed one by one by screening method,
Finally show that physico-mechanical properties, stress loading and gas pressure influence situation to the dominant frequency that ultrasonic wave is propagated in coal sample.
2. the coal sample ultrasonic wave dominant frequency detection method under a kind of three factors influence according to claim 1, feature
It is, the spring supporting bar (8) is strong decaying spring supporting bar.
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| CN109187760A (en) * | 2018-09-12 | 2019-01-11 | 中国矿业大学 | A kind of true triaxial Gas-solid Coupling coal sample anelasticity anisotropy detection device and method |
| CN109187761A (en) * | 2018-09-12 | 2019-01-11 | 中国矿业大学 | A kind of the coal and rock anelasticity anisotropy detection device and method of gas-solid thermal coupling |
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| CN103399014A (en) * | 2013-08-07 | 2013-11-20 | 重庆大学 | Gas-containing coal rock true triaxial micromechanical test system |
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