CN106053607A - Coal sample ultrasonic dominant frequency detecting device and method under influence of three factors - Google Patents
Coal sample ultrasonic dominant frequency detecting device and method under influence of three factors Download PDFInfo
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- CN106053607A CN106053607A CN201610324295.7A CN201610324295A CN106053607A CN 106053607 A CN106053607 A CN 106053607A CN 201610324295 A CN201610324295 A CN 201610324295A CN 106053607 A CN106053607 A CN 106053607A
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- coal sample
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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
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- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a coal sample ultrasonic dominant frequency detecting device and method under the influence of three factors. A high pressure gas bottle is arranged on the external side of a box; the high pressure gas bottle is communicated with the interior of the box through a pressure increasing/reducing valve; a coal sample placing table is fixed on the bottom of the box, the top, which is corresponding to the coal sample placing table, of the box is provided with a through hole, the through hole is provided with a sealing piston that is matched with the through hole; an ultrasonic wave excitation probe and a ultrasonic wave receiving probe are symmetrically arranged in the box; the ultrasonic wave excitation probe and the ultrasonic wave receiving probe are individually connected to the inner lateral wall of the box through a spring support rod; and an ultrasonic wave detector is electrically connected to the ultrasonic wave excitation probe and the ultrasonic wave receiving probe through a connection wire. The provided device can simulate the actual situation of underground coals so as to obtain the responding characteristics of dominant frequency under the coupled three factors namely crustal stress, gas pressure, and physical mechanical properties of coal, and thus basic technical guide can be provided for preventing outburst of gas and coal.
Description
Technical field
The present invention relates to a kind of coal sample dominant frequency detection device and method, the coal sample under a kind of three factor influence
Ultrasound wave dominant frequency detection device and method.
Background technology
In recent years, coal mine gas explosion the most significantly declines, but gas major accident plays number and total toll, still
Account for total accident rise number and death toll, gas preventing and control is the most important thing of Safety of Coal Mine Production work；Particularly China's coal
Ore deposit mining depth strengthens year by year, and the most domestic adopting deeply exceedes the colliery of km and have 47, and is mainly distributed on the emphasis coals such as East China
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 structure
Coal body outburst hazard is also incrementally increasing, and causes the coal rock dynamic disasters such as coal and gas prominent to take place frequently, serious restriction colliery peace
Overall height effect produces.
Actively seismical technique is utilized to provide index parameter to be deep fractures safe working for coal and gas prominent prevention
The developing direction of basic research.Dominant frequency measurement in coal body is a determinant attribute parameter of actively seismic survey, crustal stress, watt
This pressure and coal physico-mechanical properties are conclusive three factors of coal and gas prominent, therefore utilizing actively seismical technique is coal
The necessary systematic study crustal stress of index parameter, gas pressure and coal physico-mechanical properties three factor coupling is provided with Gas Outburst prevention
The response characteristic of dominant frequency under the influence of conjunction.At present, relevant scholar considers that single factor test is more, as ultrasonic in coal sample under different stress conditions
The response characteristic of ultrasound wave dominant frequency in the response characteristic of ripple dominant frequency, different physico-mechanical properties coal sample, under the conditions of lacking three factors
Dominant frequency response characteristic, there is limitation in result of study, it is impossible to the well practical situation of simulation underground, deep coal body；And it is ultrasonic
Ripple dominant frequency can reflect (the most in daily life, the container of the different scale water yields of medium difference characteristic under different condition delicately
The sound dominant frequency diversity presented is big), therefore research ultrasound wave dominant frequency is significant.
Summary of the invention
The problem existed for above-mentioned prior art, the present invention provides the coal sample ultrasound wave under a kind of three factor influence
Dominant frequency detection device and method, it is possible to the practical situation of simulation underground, deep coal body, thus draw crustal stress, gas pressure and coal
The response characteristic of dominant frequency under physico-mechanical properties three factor coupling influence, it is simple to coal and gas prominent prevention provides basic technology
Instruct.
To achieve these goals, the technical solution used in the present invention is: the coal sample under this kind three factor influence surpasses
Sound wave dominant frequency detection device, receives visit including casing, high pressure gas gas cylinder, coal sample mounting table, ultrasonic excitation probe, ultrasound wave
Head and ultrasonic depth finder,
Described high pressure gas gas cylinder is arranged on outside casing and is connected by add drop pressure valve is through with box house；
Described coal sample mounting table is fixed on casing inner bottom part, and the casing top corresponding with coal sample mounting table offers logical
Hole, described through hole is provided with the sealing piston adapted with it；
Described ultrasonic excitation probe and ultrasound wave receiving transducer are symmetricly set on box house, ultrasonic excitation probe and
Ultrasound wave receiving transducer is connected with box inside wall by spring supporting bar respectively；
Described ultrasonic depth finder is popped one's head in ultrasonic excitation respectively by connecting line and ultrasound wave receiving transducer electrically connects.
Further, described spring supporting bar is spring supporting bar of decaying by force；Use strong decay spring supporting bar can avoid sending out
The ultrasound wave penetrated is propagated to the periphery by spring supporting bar, it is ensured that the signal propagation path of acquisition is that ultrasonic excitation probe passes through
Coal sample is transmitted to through ultrasound wave receiving transducer, thus improves the accuracy of ultrasonic measurement.
Coal sample ultrasound wave dominant frequency detection method under a kind of three factor influence, concretely comprises the following steps:
A, select multiple coal sample (coal bodies as different in hardness) each other with different physico-mechanical properties, as treating
Survey coal sample；
B, a coal sample to be measured in step A is placed on by the through hole at casing top the coal sample mounting table of box house
On, ultrasonic excitation probe and ultrasound wave receiving transducer are fitted in the both sides of coal sample to be measured by spring supporting bar symmetry；
C, general seal piston by through hole press-in casing so that it is bottom contacts with the upper end of coal sample to be measured；
D, to seal piston top carry out stress loading, make sealing piston to coal sample to be measured apply stress, pass through simultaneously
Add drop pressure valve is filled with methane gas to box house, and ultrasonic depth finder makes ultrasonic excitation probe send ultrasound wave, ultrasound wave
After coal sample to be measured, detected and return ultrasonic depth finder by ultrasound wave receiving transducer carry out record；
E, the stress intensity loaded by regulation and box house are filled with the pressure size of methane gas, ultrasonic depth finder
It is recordable under various parameter, the ultrasound wave dominant frequency situation of change of this coal sample to be measured；
F, complete after, first methane gas is unloaded, and then opens sealing piston, take out the coal sample measured, then repeat
Step B～E；
G, by under various parameters, the ultrasound wave dominant frequency situation of change of each coal sample uses single argument screening method one by one to carry out point
Analysis, finally show that the dominant frequency that ultrasound wave is propagated in coal sample by physico-mechanical properties, stress loading and gas pressure affects situation.
Compared with prior art, the stress intensity that the present invention is loaded by regulation and gas pressure size and change different
The experimental condition of the coal body of physico-mechanical properties, draws the situation of change of ultrasound wave dominant frequency in coal sample in all cases, from
And ultrasound wave dominant frequency characteristic under the influence of conclusive three factors of consideration coal and gas prominent of entirety, prevent for coal and gas prominent
Offer basic technology instructs.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
In figure: 1, seal piston, 2, casing, 3, add drop pressure valve, 4, high pressure gas gas cylinder, 5, ultrasound wave receiving transducer, 6,
Coal sample mounting table, 7, ultrasonic excitation probe, 8, spring supporting bar, 9, ultrasonic depth finder.
Detailed description of the invention
The invention will be further described below.
As it is shown in figure 1, the inventive system comprises casing 2, high pressure gas gas cylinder 4, coal sample mounting table 6, ultrasonic excitation
Probe 7, ultrasound wave receiving transducer 5 and ultrasonic depth finder 9,
Described high pressure gas gas cylinder 4 is arranged on outside casing 2 and is connected with casing 2 internal run-through by add drop pressure valve 3；
Described coal sample mounting table 6 is fixed on casing 2 inner bottom part, and casing 2 top corresponding with coal sample mounting table 6 offers
Through hole, described through hole is provided with the sealing piston 1 adapted with it；
It is internal that described ultrasonic excitation probe 7 and ultrasound wave receiving transducer 5 are symmetricly set on casing 2, and ultrasonic excitation is visited
7 and ultrasound wave receiving transducer 5 be connected with casing 2 medial wall by spring supporting bar 8 respectively；
Described ultrasonic depth finder 9 is electrically connected with ultrasonic excitation probe 7 and ultrasound wave receiving transducer 5 respectively by connecting line
Connect.
As a modification of the present invention, described spring supporting bar 8 is spring supporting bar of decaying by force；Use spring of decaying by force
Support bar can avoid the ultrasound wave launched to be propagated to the periphery by spring supporting bar 8, it is ensured that the signal propagation path of acquisition is super
Sound wave excites probe 7 to be transmitted to through ultrasound wave receiving transducer 5 by coal sample, thus improves the accurate of ultrasound wave dominant frequency measurement
Degree.
The method of the present invention concretely comprises the following steps:
A, select multiple coal sample (coal bodies as different in hardness) each other with different physico-mechanical properties, as treating
Survey coal sample；
B, a coal sample to be measured in step A is placed on coal sample within casing 2 by the through hole at casing 2 top places
On platform 6, ultrasonic excitation probe 7 and ultrasound wave receiving transducer 5 are fitted in the two of coal sample to be measured by spring supporting bar 8 symmetry
Side；
C, general seal piston 1 by through hole press-in casing 2 so that it is bottom contacts with the upper end of coal sample to be measured；
D, to seal piston 1 top carry out stress loading, make sealing piston 1 to coal sample to be measured apply stress, lead to simultaneously
Crossing add drop pressure valve 3 and be filled with methane gas to casing 2 inside, ultrasonic depth finder 9 makes ultrasonic excitation probe 7 send ultrasound wave,
Ultrasound wave is detected and returns ultrasonic depth finder 9 by ultrasound wave receiving transducer 5 after coal sample to be measured and carries out record；
The internal pressure size being filled with methane gas of E, the stress intensity loaded by regulation and casing 2, ultrasonic listening
Instrument 9 is recordable under various parameter, the ultrasound wave dominant frequency situation of change of this coal sample to be measured；
F, complete after, first methane gas is unloaded, and then opens sealing piston 1, take out the coal sample measured, then repeat
Step B～E；
G, by under various parameters, the ultrasound wave dominant frequency situation of change of each coal sample uses single argument screening method one by one to carry out point
Analysis, finally show that the dominant frequency that ultrasound wave is propagated in coal sample by physico-mechanical properties, stress loading and gas pressure affects situation.
Claims (3)
1. the detection of the coal sample ultrasound wave dominant frequency under factor influence device, it is characterised in that include casing (2), height
Pressure gas gas cylinder (4), coal sample mounting table (6), ultrasonic excitation probe (7), ultrasound wave receiving transducer (5) and ultrasonic depth finder
(9),
Described high pressure gas gas cylinder (4) is arranged on casing (2) outside and is connected with casing (2) internal run-through by add drop pressure valve (3)
Connect；
Described coal sample mounting table (6) is fixed on casing (2) inner bottom part, and casing (2) top corresponding with coal sample mounting table (6) is opened
Being provided with through hole, described through hole is provided with the sealing piston (1) adapted with it；
It is internal that described ultrasonic excitation probe (7) and ultrasound wave receiving transducer (5) are symmetricly set on casing (2), ultrasonic excitation
Probe (7) and ultrasound wave receiving transducer (5) are connected with casing (2) medial wall by spring supporting bar (8) respectively；
Described ultrasonic depth finder (9) is electric with ultrasonic excitation probe (7) and ultrasound wave receiving transducer (5) respectively by connecting line
Connect.
Coal sample ultrasound wave dominant frequency detection device under a kind of three factor influence the most according to claim 1, its feature
Being, described spring supporting bar (8) is spring supporting bar of decaying by force.
3. the coal sample ultrasound wave dominant frequency detection method under a factor influence, it is characterised in that concretely comprise the following steps:
A, select multiple coal sample each other with different physico-mechanical properties, as coal sample to be measured；
B, a coal sample to be measured in step A is placed on the internal coal sample of casing (2) by the through hole at casing (2) top places
On platform (6), ultrasonic excitation probe (7) and ultrasound wave receiving transducer (5) are fitted in coal to be measured by spring supporting bar (8) symmetry
The both sides of sample；
C, piston (1) will be sealed by through hole press-in casing (2) so that it is bottom contacts with the upper end of coal sample to be measured；
D, the top sealing piston (1) is carried out stress loading, be filled with watt to casing (2) is internal by add drop pressure valve (3) simultaneously
This gas, ultrasonic depth finder (9) makes ultrasonic excitation probe (7) send ultrasound wave, and ultrasound wave is surpassed after coal sample to be measured
Acoustic receiver probe (5) detects and returns ultrasonic depth finder (9) and carries out record；
The internal pressure size being filled with methane gas of E, the stress intensity loaded by regulation and casing (2), ultrasonic depth finder
(9) it is recordable under various parameter, the ultrasound wave dominant frequency situation of change of this coal sample to be measured；
F, complete after, first methane gas is unloaded, and then opens sealing piston (1), take out the coal sample measured, then repeat step
Rapid B～E；
G, by under various parameters, the ultrasound wave dominant frequency situation of change of each coal sample uses single argument screening method to be one by one analyzed,
Finally show that the dominant frequency that ultrasound wave is propagated in coal sample by physico-mechanical properties, stress loading and gas pressure affects situation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610324295.7A CN106053607B (en) | 2016-05-16 | 2016-05-16 | Coal sample ultrasonic wave dominant frequency detection device and method under a kind of three factors influence |
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| CN201610324295.7A CN106053607B (en) | 2016-05-16 | 2016-05-16 | Coal sample ultrasonic wave dominant frequency detection device and method under a kind of three factors influence |
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| CN106053607B CN106053607B (en) | 2019-08-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| 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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| CN106053607B (en) | 2019-08-27 |
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