CN109001812A - A kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection device and method - Google Patents
A kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection device and method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 157
- 238000010168 coupling process Methods 0.000 title claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 19
- 230000008878 coupling Effects 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 239000007787 solid Substances 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000003595 mist Substances 0.000 claims abstract description 20
- 238000005507 spraying Methods 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims abstract description 15
- 238000007906 compression Methods 0.000 claims abstract description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 9
- 238000013517 stratification Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 4
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- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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- G—PHYSICS
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- 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
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- G01V1/303—Analysis for determining velocity profiles or travel times
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- 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
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
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Abstract
The invention discloses a kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection device and methods, including pressure-bearing cavity, gas delivery system, coal sample mounting table, true triaxial compression system, energy converter group, sonic apparatus and humidification system, the pressure-bearing cavity is made of the pressure resistant vessel and piston top cover of open topped, multiple axial loads of the true triaxial compression system are each passed through the side wall of pressure resistant vessel and piston top cover is contacted with four sides of test coal sample and top surface, the gas delivery system includes vacuum pump, safety gas cylinder and high pressure gas gas cylinder, the humidification system includes control host, automatically controlled water jet pump, humidity sensor and water mist spraying head；The present invention can simulate coal body in the truth of deep underground, to obtain the coal samples of the different physico-mechanical properties anisotropic feature of ultrasonic velocity under different gas pressures, different humidity and different three axis loading stress joint effects, is exploited for subsequent expiloration of coal mines and theory support is provided.
Description
Technical field
The present invention relates to a kind of coal sample Wave Velocity Anisotropy detection device and method, specifically a kind of true triaxial gas-liquid-solid coupling
Close coal sample Wave Velocity Anisotropy detection device and method.
Background technique
Due to the status of China's " rich coal, oil-poor, few gas ", determine in Future 30 Years in 50 years, based on coal
Energy resource structure changes essence will not occur.Therefore, coal is self-evident for the importance in China, is Chinese national economy
Sustained and rapid development provide strong energy safeguard.Currently, with seam mining to deep promote, coal and gas prominent
It is on the rise with coal rock dynamic disasters such as bumps, there is the mine of protrusion phenomenon also increased significantly, exploit difficulty and exploitation
Cost is also being continuously increased.Therefore, accurate forecast mine coal rock dynamic disaster is to guarantee safety of coal mines exploitation and improve to exploit effect
The important means of rate.
Ultrasonic listening technology is a kind of important means of seismic prospecting, is research coal and rock using ultrasonic listening technology
Dynamic disaster phenomenon the important research direction that parameter index is the exploitation of following Deep Mine is provided.Coal and rock deep underground by
To the influence of the multiple factors of crustal stress, gas density and humidity, and accurately measuring for ultrasonic velocity is to utilize ultrasonic wave
The premise of Detection Techniques Study on Coal rock power Disasters, therefore how in laboratory coal and rock is precisely simulated in deep underground
Actual conditions with the velocity of wave for measuring ultrasonic wave be problem in the urgent need to address at present.This research is only considered mostly at present
Single factor only carries out uniaxial loading (σ to coal sample especially when considering influence of the crustal stress to ultrasonic velocity1≠σ2=σ3
=0) or normal triaxial loads (σ1≠σ2=σ3), this does not simultaneously meet coal sample in situ in underground by three-dimensional load (σ1≠σ2≠σ3)
Practical, there are limitations for experimental result；Humidity can equally have an impact the ultrasonic velocity of coal sample, since coal is a kind of non-equal
A large amount of hole and microfissure are contained in the mineral of even property, inside, and in the rock stratum of deep underground, coal body is with water coal body mostly
Form exists, and the presence of water makes coal body plug a part of crack since argillization occurs, and generates to the velocity of wave of ultrasonic wave
Certain influence.Meanwhile coal is to be formed by plant remains by a series of biological chemistry action, therefore on its different directions
With obvious anisotropic mineral so that propagation of the ultrasonic wave in coal also has an anisotropy, therefore to coal sample trend,
Tendency and the vertical upper measurement for carrying out ultrasonic velocity could more accurate propagation characteristic of the reflected ultrasonic wave in coal.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of true triaxial gas-liquid-solid coupling coal sample velocity of wave respectively to
Anisotropic detection device and method can simulate coal body in the truth of deep underground, to obtain different physico-mechanical properties
Coal sample under different gas pressures, different humidity and different three axis loading stress joint effects ultrasonic velocity it is anisotropic
Feature provides theory support for subsequent expiloration of coal mines exploitation.
To achieve the goals above, the technical solution adopted by the present invention is that: a kind of true triaxial gas-liquid-solid coupling coal sample velocity of wave
Anisotropy detection device, including pressure-bearing cavity, gas delivery system, coal sample mounting table, true triaxial compression system, energy converter
Group, sonic apparatus and humidification system,
The pressure-bearing cavity is made of the pressure resistant vessel and piston top cover of open topped, and piston top seal is fixed on pressure-bearing
The open-mouth of container, coal sample mounting table are fixed in pressure resistant vessel, and test coal sample is on coal sample mounting table, the test coal sample
For square；
Multiple axial loads of the true triaxial compression system be each passed through pressure resistant vessel side wall and piston top cover and test
Four sides of coal sample and top surface contact, energy converter group are three, and three energy converter groups are evenly distributed on six of test coal sample
Face (i.e. three energy converter groups are separately positioned on the test trend of coal sample, tendency and vertical), energy converter group is oppositely arranged by two
Transmitting transducer and receive energy converter composition, transmitting transducer and receive energy converter be respectively coupled in test coal sample two phases
Opposite, three energy converter groups are connect by connecting line with the sonic apparatus outside pressure resistant vessel；
The gas delivery system includes vacuum pump, safety gas cylinder and high pressure gas gas cylinder, and one end of the vacuum pump is logical
It crosses pipeline to be connected to pressure resistant vessel inner sealing, the other end of vacuum pump is connected to by pipeline with safety gas cylinder, high pressure gas gas
Bottle is connected to by loading line with pressure resistant vessel inner sealing, and add drop pressure valve, two pressure gauge difference are housed on loading line
On loading line on pipeline between vacuum pump and pressure resistant vessel between add drop pressure valve and pressure resistant vessel；
The humidification system includes controlling host, automatically controlled water jet pump, humidity sensor and water mist spraying head, at automatically controlled water jet pump
On the outside of pressure resistant vessel, humidity sensor and water mist spraying head are each attached in pressure resistant vessel, and one end of automatically controlled water jet pump passes through defeated
Water pipe is connect with water mist spraying head, and the other end of automatically controlled water jet pump connects water source；Control host is connect with humidity sensor.
Further, the coal sample places countertop and multiple axial load ends open up round recessed, makes three energy converter groups
In transmitting transducer and receive energy converter and be respectively in each round recessed, and make each transmitting transducer and to connect by spring
Receive six face pressure close coupling of the energy converter with test coal sample.
Further, the axial load end for being respectively at test four sides of coal sample is all made of flexible contact, in examination
The axial load end of coal sample top surface is tested using rigid contact.
A kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection method, specific steps are as follows:
A, the primary structure coal sample of multiple and different physico-mechanical properties or the conjunction of prefabricated different physico-mechanical properties are selected
Square moulded coal made of coal-forming, as test coal sample；
B, the piston top cover of pressure-bearing cavity is opened, one of test coal sample made of selecting step A is placed on pressure-bearing appearance
On coal sample mounting table in device, true triaxial compression system is adjusted, keeps the pressure head of each axial load each with test coal sample respectively
Face contact, while making each transmitting transducer and receiving energy converter and test each face direct-coupling of coal sample, make to live after the completion
It fills in top cover and pressure resistant vessel sealing is fixed；
C, before coal sample test, the valve of add drop pressure valve is opened, high pressure gas gas cylinder passes through loading line to pressure-bearing cavity
It is inside filled with methane gas, pressure gauge is observed after the intracorporal methane gas of pressure pocket reaches certain pressure, closes add drop pressure valve,
Then continuous observation pressure gauge numerical value change situation whithin a period of time, so that pressure-bearing inside cavity air-tightness is checked,
After airtight test finishes and confirms that air-tightness is good, the intracorporal methane gas of pressure pocket is discharged into safety gas cylinder；
D, vacuum pump is opened to vacuumizing in pressure pocket body, is observed by pressure gauge, when reaching one in pressure pocket body
Determine to stop vacuum pump after vacuum values, opening sonic apparatus makes each transmitting transducer transmitting acoustic signals, and acoustic signals are by examination
Coal sample is tested to corresponding each reception energy converter, received acoustic signals are fed back to sonic apparatus by each reception energy converter,
Sonic apparatus records in real time, and according to transmitting transducer issue sound wave at the time of and receive energy converter receive sound wave at the time of, thus
The ultrasonic velocity situation that three energy converter groups respectively measure in the case of test coal sample is in vacuum, no-load is obtained, as right
According to data；Specific velocity of wave of the sound wave in coal sample are as follows:
Wherein, L is the distance between opposite transmitting transducer and reception energy converter (i.e. test two opposite faces of coal sample
Length), t is the time that transmitting transducer issues that ultrasonic wave is received to reception energy converter, t0It is the known delay time；
E, complete step D acquisition after, open true triaxial compression system, make each axial load test coal sample it is vertical,
Independently apply σ in trend and tendency1、σ2、σ3It is main to two lateral loads, and σ1> σ2> σ3, while passing through high pressure
Gas gas cylinder is filled with gas to pressure-bearing inside cavity, closes add drop pressure valve after reaching target pressure value by pressure gauge observation；It opens
Dynamic humidification system, makes automatically controlled water jet pump spray water mist humidification into pressure pocket body by water mist spraying head, and humidity sensor is surveyed in real time
The amount intracorporal humidity value of pressure pocket feeds back to control host, when the control received real-time wet angle value of host reaches setting humidity value
Close automatically controlled water jet pump；Three that sonic apparatus is recorded under the gas pressure value, humidity value and three axis loading stress values are opened to change
The velocity of wave situation that energy device group measures after then adjusting gas pressure value, humidity value and three axis loading stress values, opens sonic apparatus again
The velocity of wave situation that the three energy converter groups of secondary record in this case measure, show that the test coal sample is in after repeatedly adjusting
In the case of different gas pressures, different humidity and different three axis loading stresses, which measures on different stratification directions
Ultrasonic velocity situation of change；
F, after the completion, three axis loading stresses of first unloading test coal sample, are then switched off water mist spraying head, then again by device in Gas
Body is discharged in safety gas cylinder by pipeline, is unloaded to the gas pressure in pressure resistant vessel, is finally opened piston top cover, is taken
The test coal sample measured out；One is chosen again in test coal sample obtained in step, step B~F is repeated, until all
The test coal sample of preparation completes test process；
G, in the case of to the different tests coal sample obtained, different gas pressures, different humidity and different three axis loading stresses
Ultrasonic velocity situation of change and the contrasting data that obtains in conjunction with step D carry out comprehensive analysis, show that different tests coal sample exists
Velocity of wave difference on different stratification directions (i.e. the trend of test coal sample, tendency and vertical), final analysis test coal sample is various
Under the conditions of Wave Velocity Anisotropy trend, tendency and the vertical velocity of wave otherness of coal sample (test).
Compared with prior art, by the present invention in that the coal sample of different physico-mechanical properties is in different gas pressures, difference
Under the conditions of humidity and different three axis loading stresses, so as to simulate coal body in the truth of deep underground, then above-mentioned
On the basis of different condition variation, to test coal sample in trend, tendency and vertical, ultrasonic wave variation is measured on three directions respectively
Situation, finally obtain it is above-mentioned it is various under the conditions of test the anisotropic feature of ultrasonic velocity of coal sample, survey for subsequent coal mine
It visits exploitation and theory support is provided.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the stratification direction schematic diagram of coal sample in the present invention.
In figure: 1, pressure-bearing cavity, 2, piston top cover, 3, coal sample mounting table, 4, test coal sample, 5, add drop pressure valve, 6, height
Pressure gas gas cylinder, 7, pressure gauge, 8, true triaxial compression system, 9, axial load, 10, transmitting transducer, 11, reception energy converter, 12,
Vacuum pump, 13, safety gas cylinder, 14, sonic apparatus, 15, water mist spraying head, 16, humidity sensor, 17, automatically controlled water jet pump, 18, control
Host；X-axis is trend, and y-axis is tendency, and z-axis is vertical.
Specific embodiment
The present invention will be further described below.
As shown, a kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection device, including pressure-bearing cavity 1,
Gas delivery system, coal sample mounting table 3, true triaxial compression system 8, energy converter group, sonic apparatus 14 and humidification system,
The pressure-bearing cavity 1 is made of the pressure resistant vessel and piston top cover 2 of open topped, and the sealing of piston top cover 2 is fixed on
The open-mouth of pressure resistant vessel, coal sample mounting table 3 are fixed in pressure resistant vessel, and test coal sample 4 is on coal sample mounting table 3, described
Test coal sample 4 is square；
Multiple axial loads 9 of the true triaxial compression system 8 be each passed through pressure resistant vessel side wall and piston top cover 2 and examination
Four sides and the top surface contact of coal sample 4 are tested, energy converter group is three, and three energy converter groups are evenly distributed on test coal sample 4
Six faces (i.e. three energy converter groups are separately positioned on the trend of test coal sample 4, tendency and vertical), energy converter group is opposite by two
The transmitting transducer 10 and reception energy converter 11 of setting form, and transmitting transducer 10 and reception energy converter 11 are respectively coupled in test
Two opposite faces of coal sample 4, three energy converter groups are connect by connecting line with the sonic apparatus 14 outside pressure resistant vessel；
The gas delivery system includes vacuum pump 12, safety gas cylinder 13 and high pressure gas gas cylinder 6, the vacuum pump 12
One end is connected to by pipeline with pressure resistant vessel inner sealing, and the other end of vacuum pump 12 is connected to by pipeline with safety gas cylinder 13,
High pressure gas gas cylinder 6 is connected to by loading line with pressure resistant vessel inner sealing, equipped with add drop pressure valve 5 on loading line, two
A pressure gauge 7 is attached separately to filling between add drop pressure valve 5 and pressure resistant vessel on the pipeline between vacuum pump 12 and pressure resistant vessel
On air pipe；
The humidification system includes controlling host 18, automatically controlled water jet pump 17, humidity sensor 16 and water mist spraying head 15, automatically controlled
Water jet pump 17 is on the outside of pressure resistant vessel, and humidity sensor 16 and water mist spraying head 15 are each attached in pressure resistant vessel, automatically controlled water spray
One end of pump 17 is connect by water-supply-pipe with water mist spraying head 15, and the other end of automatically controlled water jet pump 17 connects water source；Control host 18
It is connected with humidity sensor 16.
Further, 3 top surface of coal sample mounting table and 9 end of multiple axial loads open up round recessed, make three energy converters
Transmitting transducer 10 and reception energy converter 11 in group are respectively in each round recessed, and make each transmitting transducing by spring
The six face pressure close coupling of device 10 and reception energy converter 11 with test coal sample 4.
Further, 9 end of axial load for being respectively at test 4 four sides of coal sample is all made of flexible contact, is in
9 end of axial load for testing 4 top surface of coal sample uses rigid contact.
A kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection method, specific steps are as follows:
A, the primary structure coal sample of multiple and different physico-mechanical properties or the conjunction of prefabricated different physico-mechanical properties are selected
Square moulded coal made of coal-forming, as test coal sample 4；
B, the piston top cover 2 of pressure-bearing cavity 1 is opened, one of test coal sample 4 made of selecting step A is placed on pressure-bearing
On coal sample mounting table 3 in container, adjust true triaxial compression system 8, make the pressure head of each axial load 9 respectively with test coal sample 4
Each face contact, while make each transmitting transducer 10 and receive energy converter 11 and test coal sample 4 each face direct-coupling,
It after the completion seals piston top cover 2 and pressure resistant vessel to fix；
C, before coal sample test, the valve of add drop pressure valve 5 is opened, high pressure gas gas cylinder 8 passes through loading line to pressure pocket
It is filled with methane gas in body 1, observes pressure gauge 7 after the methane gas in pressure-bearing cavity 1 reaches certain pressure, closes add drop
Pressure valve 5, the then numerical value change situation whithin a period of time of continuous observation pressure gauge 7, thus to 1 inside air-tightness of pressure-bearing cavity into
Row checks, after airtight test finishes and confirms that air-tightness is good, the methane gas in pressure-bearing cavity 1 is discharged into substitute
13 in bottle；
D, vacuum pump 12 is opened to vacuumizing in pressure-bearing cavity 1, is observed by pressure gauge 7, is reached when in pressure-bearing cavity 1
Stop vacuum pump after to certain vacuum value, opening sonic apparatus 14 makes each transmitting transducer 10 emit acoustic signals, sound wave letter
Number through overtesting coal sample 4 to corresponding each reception energy converter 11, each reception energy converter 11 is by received acoustic signals
Feed back to sonic apparatus 14, sonic apparatus 14 records in real time, and at the time of issue sound wave according to transmitting transducer 10 and receives energy converter
At the time of receiving sound wave, to show that test coal sample 4 be in that three energy converter groups in the case of vacuum, no-load respectively measure surpasses
Acoustic velocity situation, as contrasting data；Specific velocity of wave of the sound wave in coal sample are as follows:
Wherein, L is the distance between opposite transmitting transducer 10 and reception energy converter 11 (i.e. test 4 two phases of coal sample
The length on opposite), t is the time that transmitting transducer 10 issues that ultrasonic wave is received to reception energy converter 11, t0Be sonic apparatus
The delay time known；
E, after the acquisition for completing step D, true triaxial compression system 8 is opened, makes each axial load 9 hanging down in test coal sample 4
To, trend and tendency on independently apply σ1、σ2、σ3It is main to two lateral loads, and σ1> σ2> σ3, while passing through height
Pressure gas gas cylinder 6 closes add drop pressure after reaching target pressure value by the observation of pressure gauge 7 to gas is filled with inside pressure-bearing cavity 1
Valve 5；Start humidification system, automatically controlled water jet pump 17 is made to spray water mist humidification into pressure-bearing cavity 1 by water mist spraying head 15, humidity passes
Humidity value in 16 real-time measurement pressure-bearing cavity 1 of sensor feeds back to control host 18, when the control received real-time humidity of host 18
Value closes automatically controlled water jet pump 17 when reaching setting humidity value；It opens sonic apparatus 14 and is recorded in the gas pressure value, humidity value and three
Then the velocity of wave situation that three energy converter groups under axis loading stress value measure adjusts gas pressure value, humidity value and three axis and adds
After carrying stress value, opens sonic apparatus 14 and be again recorded in the velocity of wave situation that three energy converter groups in this case measure, through excessive
Show that the test coal sample 4 is in the case of different gas pressures, different humidity and different three axis loading stresses after secondary adjustment, the examination
Test the ultrasonic velocity situation of change that coal sample 4 measures on different stratification directions；
F, after the completion, three axis loading stresses of first unloading test coal sample 4, are then switched off water mist spraying head 15, then again will watt
This gas is discharged in safety gas cylinder 13 by pipeline, is unloaded to the gas pressure in pressure resistant vessel, is finally opened piston
Top cover 2 takes out the test coal sample 4 measured；Choose one again in test coal sample 4 obtained in step, repeat step B~
F, until the test coal sample 4 of all preparations completes test process；
G, in the case of to the different tests coal sample 4 obtained, different gas pressures, different humidity and different three axis loading stresses
Ultrasonic velocity situation of change and the contrasting data that obtains in conjunction with step D carry out comprehensive analysis, show that different tests coal sample 4 exists
Velocity of wave difference on different stratification directions (i.e. the trend of test coal sample 4, tendency and vertical), final analysis test coal sample 4 is each
Wave Velocity Anisotropy (testing trend, tendency and the vertical velocity of wave otherness of coal sample 4) under the conditions of kind.
Claims (4)
1. a kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection device, which is characterized in that including pressure-bearing cavity
(1), gas delivery system, coal sample mounting table (3), true triaxial compression system (8), energy converter group, sonic apparatus (14) and humidification system
System,
The pressure-bearing cavity (1) is made of the pressure resistant vessel and piston top cover (2) of open topped, and piston top cover (2) sealing is fixed
In the open-mouth of pressure resistant vessel, coal sample mounting table (3) is fixed in pressure resistant vessel, and test coal sample (4) is in coal sample mounting table (3)
On, the test coal sample (4) is square；
Multiple axial loads (9) of the true triaxial compression system (8) be each passed through pressure resistant vessel side wall and piston top cover (2) with
Four sides and the top surface contact of coal sample (4) are tested, energy converter group is three, and three energy converter groups are evenly distributed on test coal sample
(4) six faces, energy converter group are made of two transmitting transducers being oppositely arranged (10) and reception energy converter (11), and transmitting is changed
Energy device (10) and reception energy converter (11) are respectively coupled in two opposite faces of test coal sample (4), and three energy converter groups pass through company
Wiring is connect with the sonic apparatus (14) outside pressure resistant vessel；
The gas delivery system includes vacuum pump (12), safety gas cylinder (13) and high pressure gas gas cylinder (6), the vacuum pump
(12) one end is connected to by pipeline with pressure resistant vessel inner sealing, and the other end of vacuum pump (12) passes through pipeline and safety gas cylinder
(13) it is connected to, high pressure gas gas cylinder (6) is connected to by loading line with pressure resistant vessel inner sealing, is equipped on loading line
Add drop pressure valve (5), two pressure gauges (7) are attached separately on the pipeline between vacuum pump (12) and pressure resistant vessel and add drop pressure valve
(5) on the loading line between pressure resistant vessel；
The humidification system includes controlling host (18), automatically controlled water jet pump (17), humidity sensor (16) and water mist spraying head (15),
Automatically controlled water jet pump (17) is on the outside of pressure resistant vessel, and humidity sensor (16) and water mist spraying head (15) are each attached to pressure resistant vessel
Interior, one end of automatically controlled water jet pump (17) is connect by water-supply-pipe with water mist spraying head (15), and the other end of automatically controlled water jet pump (17) connects
Water receiving source；Control host (18) and humidity sensor (16) connection.
2. a kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection device according to claim 1, feature
It is, coal sample mounting table (3) top surface and multiple axial loads (9) end open up round recessed, make in three energy converter groups
Transmitting transducer (10) and reception energy converter (11) are respectively in each round recessed, and make each transmitting transducer by spring
(10) and receive energy converter (11) with test coal sample (4) six face pressure close coupling.
3. a kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection device according to claim 1, feature
It is, described axial load (9) end for being respectively at test (4) four sides of coal sample is all made of flexible contact, in test coal
Axial load (9) end of sample (4) top surface uses rigid contact.
4. a kind of true triaxial gas-liquid-solid coupling coal sample Wave Velocity Anisotropy detection method, which is characterized in that specific steps are as follows:
A, the primary structure coal sample of multiple and different physico-mechanical properties or the synthesis coal of prefabricated different physico-mechanical properties are selected
Manufactured square moulded coal, as test coal sample (4)；
B, the piston top cover (2) of pressure-bearing cavity (1) is opened, one of test coal sample (4) made of selecting step A, which is placed on, holds
On coal sample mounting table (3) in pressure vessel, adjust true triaxial compression system (8), make the pressure head of each axial load (9) respectively with examination
Each face contact of coal sample (4) is tested, while making each transmitting transducer (10) and receiving energy converter (11) and test coal sample (4)
Each face direct-coupling after the completion seals piston top cover (2) and pressure resistant vessel and fixes；
C, before coal sample test, the valve of add drop pressure valve (5) is opened, high pressure gas gas cylinder (6) passes through loading line to pressure pocket
It is filled with methane gas in body (1), observes pressure gauge (7) after the methane gas in pressure-bearing cavity (1) reaches certain pressure, closes
Add drop pressure valve (5), then continuous observation pressure gauge (7) numerical value change situation whithin a period of time, thus to pressure-bearing cavity (1)
Internal air-tightness is checked, after airtight test finishes and confirms that air-tightness is good, by the gas in pressure-bearing cavity (1)
Gas is discharged into safety gas cylinder (13)；
D, vacuum pump (12) are opened to vacuumizing in pressure-bearing cavity (1), are observed by pressure gauge (7), when pressure-bearing cavity (1)
Inside reach certain vacuum value to stop vacuum pump (12) later, opening sonic apparatus (14) makes each transmitting transducer (10) to emit sound wave
Signal, acoustic signals are through overtesting coal sample (4) to corresponding each reception energy converter (11), each reception energy converter (11)
Received acoustic signals are fed back into sonic apparatus, sonic apparatus (14) records in real time, and issues sound wave according to transmitting transducer (10)
At the time of and receive energy converter (11) receive sound wave at the time of, thus obtain test coal sample (4) be in the case of vacuum, no-load
The ultrasonic velocity situation that three energy converter groups respectively measure, as contrasting data；
E, complete step D acquisition after, open true triaxial compression system, make each axial load test coal sample (4) it is vertical, walk
To with independently apply σ in tendency1、σ2、σ3It is main to two lateral loads, and σ1> σ2> σ3, while passing through high pressure watt
This gas cylinder (6) is filled with gas to pressure-bearing cavity (1) is internal, closes add drop after reaching target pressure value by pressure gauge (7) observation
Pressure valve (5)；Start humidification system, automatically controlled water jet pump (17) is made to spray water mist into pressure-bearing cavity (1) by water mist spraying head (15)
It humidifies, the humidity value in humidity sensor (16) real-time measurement pressure-bearing cavity (1) feeds back to control host (18), when control host
(18) automatically controlled water jet pump (17) are closed when received real-time wet angle value reaches setting humidity value；It opens sonic apparatus (14) and is recorded in this
The velocity of wave situation that three energy converter groups under gas pressure value, humidity value and three axis loading stress values measure, then adjusts gas
After pressure value, humidity value and three axis loading stress values, opens sonic apparatus (14) and be again recorded in three energy converters in this case
The velocity of wave situation that group measures show that the test coal sample (4) is in different gas pressures, different humidity and not after repeatedly adjusting
With the ultrasonic velocity situation of change that in the case of three axis loading stresses, which measures on different stratification directions；
F, after the completion, three axis loading stresses of first unloading test coal sample, are then switched off water mist spraying head (15), then again by device in Gas
Body is discharged in safety gas cylinder (13) by pipeline, is unloaded to the gas pressure in pressure resistant vessel, is finally opened piston top
It covers (2), takes out the test coal sample (4) measured；One is chosen again in test coal sample (4) obtained in step, repeats step
B~F, until the test coal sample (4) of all preparations completes test process；
G, in the case of to the different tests coal sample (4) obtained, different gas pressures, different humidity and different three axis loading stresses
Ultrasonic velocity situation of change and the contrasting data for combining step D to obtain progress comprehensive analysis, show that different tests coal sample (4) exists
Velocity of wave difference on different stratification directions, the Wave Velocity Anisotropy of final analysis test coal sample (4) under various conditions.
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| CN109580400A (en) * | 2018-12-27 | 2019-04-05 | 深圳大学 | High temperature and middle low strain dynamic rate load lower solid dynamic anisotropic properties test method |
| CN110988141A (en) * | 2019-11-29 | 2020-04-10 | 同济大学 | On-site soil sample three-dimensional testing device and method based on shear wave velocity |
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| CN106053231A (en) * | 2016-07-18 | 2016-10-26 | 西南石油大学 | Testing device for anisotropism of shale in true-triaxial condition and testing method of testing device |
| CN108088745A (en) * | 2017-12-18 | 2018-05-29 | 山东科技大学 | Elastic modulus of rock timeliness deterioration process test device and method under a kind of relative humidity cycle effect |
| CN108426782A (en) * | 2018-02-27 | 2018-08-21 | 山东科技大学 | The lower damage of rock evolution ultrasonic monitor device of multi- scenarios method effect |
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| CN106018558A (en) * | 2016-05-16 | 2016-10-12 | 中国矿业大学 | Coal sample shear wave velocity detection device and method based on multi-field coupling |
| CN106053231A (en) * | 2016-07-18 | 2016-10-26 | 西南石油大学 | Testing device for anisotropism of shale in true-triaxial condition and testing method of testing device |
| CN108088745A (en) * | 2017-12-18 | 2018-05-29 | 山东科技大学 | Elastic modulus of rock timeliness deterioration process test device and method under a kind of relative humidity cycle effect |
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| CN109580400A (en) * | 2018-12-27 | 2019-04-05 | 深圳大学 | High temperature and middle low strain dynamic rate load lower solid dynamic anisotropic properties test method |
| CN110988141A (en) * | 2019-11-29 | 2020-04-10 | 同济大学 | On-site soil sample three-dimensional testing device and method based on shear wave velocity |
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