CN104198679A - Full-waveform synchronous integrated monitoring system and method for deformation and fracture process of coal rock - Google Patents
Full-waveform synchronous integrated monitoring system and method for deformation and fracture process of coal rock Download PDFInfo
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- CN104198679A CN104198679A CN201410473355.2A CN201410473355A CN104198679A CN 104198679 A CN104198679 A CN 104198679A CN 201410473355 A CN201410473355 A CN 201410473355A CN 104198679 A CN104198679 A CN 104198679A
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Abstract
The invention provides a full-waveform synchronous integrated monitoring system and method for the deformation and fracture process for coal rock, and belongs to the field of monitoring the deformation and the fracture of the coal rock. The system comprises a loading mechanism, a sensor unit, a data processing unit, a controller, a display and a data storage device. The system adopts the loading mechanism to enable coal rock samples to be deformed and fractured. During the deformation and fracture process of the coal rock, the sensor unit and the data processing unit are controlled by the controller to synchronously collect self-potential, electric charge induction and acoustic emission signals and self-potential, electric charge induction and acoustic emission signals are stored in the data storage device, and full-waveform synchronous signals about the self-potential, the electric charge induction and the acoustic emission signals during the deformation and fracture process of the coal rock are displayed in the display in real time. The system and method can be used for synchronously monitoring the self-potential, the electric charge induction and the acoustic emission signals during the deformation and fracture process of the coal rock so as to obtain the full-waveform synchronous signals. The system has the advantages that the structure is simple, the manufacturing cost is low, multiple signals can be collected continuously and synchronously, collecting time is long and operation is simple.
Description
Technical field
The invention belongs to the coal rock deformation monitoring field of breaking, be specifically related to the synchronous comprehensive monitor system of a kind of coal rock deformation rupture process Full wave shape and method.
Background technology
Rock burst is the serious disaster of mine, increasing along with digging intensity and the degree of depth, mining conditions becomes increasingly complex, and does not originally have the mine of danger of burst also to occur impact phenomenon, and the mine power disasters such as rock burst have become the chief threat that mining area safety is produced.Therefore press on impact ground makes accurately, prediction timely, and then take measures, the generation that prevents and treats disaster is particularly important with regard to what become, becoming scientific worker and mine engineering technician's vital task, is key scientific problems in the urgent need to address in national economy and social development.
The self-potential monitoring of rock burst, electric charge induction monitoring and acoustic emission monitor(ing) respectively have superiority, but it is often not accurate enough to apply the rock burst precursor information that single monitoring means obtains, and the monitoring result of single monitoring means, with one-sidedness, can not be reacted the unstable fracture rule of development of mine deep part rock mass more all-sidedly and accurately.In recent years, coal rock deformation rupture process precursor signal observation technology obtains significant improvement, but be all independent observation mostly, mostly can only record the data such as Ring-down count, incident duration, energy, rise time, and cannot obtain Full wave shape (signal waveforms that full frequency band is whole), cannot transmit waveform, lose more effective information.
Therefore, need a kind of experimental system can monitor self-potential, electric charge induction and the acoustic emission signal in coal rock deformation rupture process simultaneously, obtain the Full wave shape synchronizing signal of coal rock deformation rupture process self-potential, electric charge induction and acoustic emission signal.
Summary of the invention
The deficiency existing for prior art, the invention provides the synchronous comprehensive monitor system of a kind of coal rock deformation rupture process Full wave shape.
Technical scheme of the present invention:
The synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape, comprising: load maintainer, sensor unit, data processing unit, controller, display and data storage device;
Described sensor unit, comprises a plurality of self-potential sensors, a plurality of calibrate AE sensor and a plurality of charge sensor; The input end of described sensor unit connects the electrode probe of a plurality of self-potential sensors simultaneously, an output terminal of the electric charge of the acoustic emission probe of a plurality of calibrate AE sensors, a plurality of charge sensors probe and controller; The electrode probe of described a plurality of self-potential sensors and the acoustic emission probe of a plurality of calibrate AE sensors, take and avoid crackle as principle, is arranged near the position that crackle may appear in coal petrography sample body; The electric charge probe of described a plurality of charge sensors distributes and is placed near the position of coal petrography sample;
An input end of the output terminal connection data processing unit of described sensor unit, an output terminal of data processing unit connects an input end of display, the input end of another output terminal connection data memory storage of data processing unit;
Another input end of the second output terminal connection data processing unit of described controller, the 3rd output terminal of controller connects another input end of display; The input end of described controller carries out man-machine interaction by human-computer interaction interface;
Described data processing unit, comprising: analog to digital converter and data buffer; The input end of described analog to digital converter is as the output terminal of a sensor input connection unit of data processing unit; An input end of the output terminal connection data buffer of described analog to digital converter; Another input end of data buffer connects the second output terminal of controller as another input end of data processing unit, the input end of an output terminal connection data memory storage of data buffer, another output terminal of data buffer connects another input end of display.
Coal petrography sample is placed in the loading region of load maintainer, and described load maintainer, for for coal petrography sample is loaded, makes coal petrography sample produce the mechanism of deformation fracture.
The electrode probe of self-potential sensor and the acoustic emission probe of calibrate AE sensor directly contact with the surface of the relevant position of rock mass sample respectively, and surface of contact is coupled with couplant.
Described sensor unit is for according to the corresponding steering order of controller, self-potential, electric charge induction and acoustic emission Full wave shape signal that synchronous acquisition coal petrography sample deformation rupture process produces, and synchronously convert analog electrical signal to and send data processing unit to.
Described controller is used for sending corresponding steering order to sensor unit, data processing unit and display.
Described data processing unit is used for according to the corresponding steering order of controller, receive the analog electrical signal that also amplification sensor unit sends, and be converted into digital electric signal, and the digital electric signal after conversion is sent to data storage device stores, be also sent to display simultaneously and show.
Self-potential, electric charge induction and acoustic emission digital electric signal that described data storage device transmits for receiving and store analog to digital converter.
Described display, for according to the corresponding steering order of controller, carries out simultaneous display to real-time self-potential, electric charge induction and acoustic emission signal Full wave shape.
Adopt copper mesh, make enclosed type electric magnetic shield member coal petrography sample, load maintainer, sensor unit are all covered in this electromagnetic screen member, shield the interference of external electromagnetic signal to sensor unit synchronous acquisition self-potential, electric charge induction and acoustic emission signal process.
Adopt the described synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape to carry out the method for the synchronous comprehensive monitoring of coal rock deformation rupture process Full wave shape, comprise following concrete steps:
Step 1: the corresponding loading region that coal petrography sample is fixed on to load maintainer; Described load maintainer, for for coal petrography sample is loaded, makes coal petrography sample produce the mechanism of deformation fracture;
Near step 2: arrange the electrode probe of self-potential sensor, the acoustic emission probe of calibrate AE sensor in coal petrography sample body, meanwhile, the electric charge probe of charge sensor is settled in position coal petrography sample;
According to the shape of coal petrography sample to be monitored, joint, cranny development situation and the rule of breaking, by the acoustic emission probe of the electrode probe of a plurality of self-potential sensors and a plurality of calibrate AE sensors, take and avoid crackle as principle, distribution is arranged near the position that crackle may appear in coal petrography sample body, the electric charge probe of a plurality of charge sensors is distributed simultaneously and is placed near position coal petrography sample;
Step 3: on controller, acquisition parameter is arranged or adjusted, described acquisition parameter comprises: sample frequency, sampling channel, data are preserved position and data storage file name;
Step 4: startup system, starts pre-self-potential, electric charge induction and the acoustic emission Full wave shape signal that gathers coal petrography sample, and show in real time on display but do not preserve;
Step 5: the Full wave shape signal waveform showing according to display, judge that noise signal amplitude, whether in tolerance interval, is, perform step 6, no, perform step 3;
Step 6: loading velocity, load mode are set on load maintainer, and start-up loading mechanism loads coal petrography sample;
Step 7: according to the corresponding steering order of controller, by the self-potential collecting, electric charge induction and acoustic emission signal real time data synchronization be sent to data storage device for upper layer application, go back the Full wave shape that synchronized transmission to display carries out signal simultaneously and show;
Step 8: after coal petrography sample destroys, simultaneously stop load maintainer and signals collecting.
Beneficial effect: self-potential, electric charge induction and the acoustic emission signal of the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape of the present invention in can Simultaneous Monitoring coal rock deformation rupture process, obtains the Full wave shape synchronizing signal of coal rock deformation rupture process self-potential, electric charge induction and acoustic emission signal.System architecture of the present invention is simple, cost of manufacture is low, can odd row signal synchronous acquisition, acquisition time is long, simple to operate.
Accompanying drawing explanation
Fig. 1 is the synchronous comprehensive monitor system structural representation of coal rock deformation rupture process Full wave shape of one embodiment of the present invention;
Fig. 2 is the sensor amplifier circuit theory diagrams of the self-potential sensor of one embodiment of the present invention employing;
Fig. 3 is the pre-amplification circuit schematic diagram of the charge sensor of one embodiment of the present invention employing;
Fig. 4 is the structural representation of the data processing unit of one embodiment of the present invention;
Fig. 5 is the synchronous integrated monitoring process flow diagram of coal rock deformation rupture process Full wave shape of one embodiment of the present invention;
Fig. 6 is the probe of various sensors of one embodiment of the present invention position distribution schematic diagram on coal petrography sample.
Wherein, 1. downforce 6. electrode probe of upward pressure head 5. pressing machinees of lower cross-over block 4. pressing machinees of the upper cross-over block 3. pressing machine downforce heads of coal petrography sample 2. pressing machine upward pressure heads to 7. acoustic emission probe 8. electric charges, the 9. sensor unit 10. data processing unit 101. analog to digital converter 102. data buffer 11. display 12. hard disk 13. controller 14. electromagnetic screen members of popping one's head in.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
One embodiment of the present invention provide the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape, structured flowchart as shown in Figure 1, comprising: pressing machine, sensor unit 9, data processing unit 10, display 11, hard disk 12, controller 13, electromagnetic screen member 14;
What the load maintainer of present embodiment adopted is pressing machine, utilize pressing machine to load coal petrography sample deformation is broken coal petrography sample, the pressing machine adopting is the microcomputer controlled electro-hydraulic servo universal hydraulic testing machine of the WAW-600D of Jinan Fang Chen instrument and equipment company limited production, maximum test force reaches 600KN, this testing machine is controlled experiment power, displacement, speed by microcomputer, acquisition, processing, printing from experimental data, all realize robotization.When specific experiment, pressing machine adopts two kinds of load controlling mode to carry out uniaxial loading to coal petrography sample 1, and loading velocity general control is at 20～500N/s.
What present embodiment data storage device adopted is hard disk 12, and model is WD1502FAEX.
The sensor unit that present embodiment adopts, comprises 6 self-potential sensors, 6 calibrate AE sensors and 4 charge sensors.The input end of sensor unit 9 connects the electrode probe of 6 self-potential sensors simultaneously, an output terminal of the electric charge of the acoustic emission probe of 6 calibrate AE sensors, 4 charge sensors probe and controller 13; An input end of the output terminal connection data processing unit 10 of described sensor unit 9, an output terminal of data processing unit 10 connects an input end of display 11, the input end of another output terminal connection data memory storage of data processing unit 10; Another input end of the second output terminal connection data processing unit 10 of controller 13, the 3rd output terminal of controller 13 connects another input end of display 11; The input end of described controller 13 carries out man-machine interaction by human-computer interaction interface;
The self-potential sensor that present embodiment adopts, by electrode probe to 6 and sensor amplifier form.It is the circular copper sheet that 5mm, thickness are 0.5mm that two electrode probes are diameter.Sensor amplifier, as shown in Figure 2, by charge-sensitive level with amplify output stage two parts and form, described charge-sensitive level mainly, fast response time high by input impedance, open-loop gain integrated operational amplifier large, that the model of paster encapsulation is LMC6001 forms; The integrated operational amplifier that described amplification output stage is mainly 0P07 by CR-RC wave filter and model forms, and wherein CR-RC wave filter consists of capacitor C 11, resistance R 9, resistance R 10 and capacitor C 12; The input end of LMC6001 type integrated operational amplifier, 2 pin and 3 pin, connect respectively two electrode probes, the output terminal of the integrated operational amplifier of LMC6001,6 pin connect CR-RC filter input end, are connected with capacitor C 11; The output terminal of CR-RC wave filter, capacitor C 12 is by the input end of resistance R 2 and 0P07 type integrated operational amplifier, and 2 pin are connected in parallel; And between 2 pin of LMC6001 type integrated operational amplifier and 6 pin respectively parallel feedback capacitor C 2 and feedback resistance R1 to increase the sensitivity of the faint self-potential signal of electrode pair and to improve the signal to noise ratio (S/N ratio) of sensor; Gain-adjusted end (being GAIN end and 6 pin) non-essential resistance in parallel by 0P07 type integrated operational amplifier can regulate arbitrarily the enlargement factor of amplifying output stage between 1～101 times.
The model of the calibrate AE sensor that present embodiment adopts is PK31, acoustic emission probe 7 is the supporting acoustic emission probe of PK31 type calibrate AE sensor, PK31 type calibrate AE sensor is produced by U.S. physical acoustics company (PAC), and sensitivity is 106db, and frequency of operation is 15-40kHz.
The charge sensor that present embodiment adopts consists of electric charge probe 8 and pre-amplification circuit, what wherein pre-amplification circuit adopted is the pre-amplification circuit 2 that in Chinese patent ZL200810013033.4, accompanying drawing 3 provides, as shown in Figure 3, be documented in the first paragraph of Instructions Page 3 of this patent, be that pre-amplification circuit comprises AD8066 type operational amplifier U1A and U1B, electrochemical capacitor C24, C25, C36～C38, capacitor C 26～C35 and resistance R 18～R27; 1 pin of U1A connects R20, C28, C31 one end, 2 pin connect the other end of C30 one end and C28, R20,3 pin ground connection, and 4 pin connect the negative pole of negative supply, C35 one end and C37,8 pin connect the positive pole of positive supply, C34 one end and C38, and C34, the C35 other end, the negative pole of C38 and the positive pole of C37 join and ground connection; IN connects the other end of C29, R19 one end and C30, C29 another termination R21 one end, R21 other end ground connection, another termination of R19 C25 positive pole, C27, R18 one end, another termination of R18 C24 positive pole, C26 one end and HV power supply, C25, C24 negative pole and C27, the C26 other end join and ground connection; 4 pin of U1B connect negative supply, it is anodal that 5 pin meet R25, R27 one end and C36,6 pin connect the R25 other end, R24, R26 and C33 one end, 7 pin meet R26, the C33 other end and OUT, 8 pin connect positive supply, another termination of R24 C32, R23 one end, R23 another termination R22 one end and the C31 other end, R22, R27, the C32 other end and C36 negative pole join and ground connection.Electric charge probe 8 use shielding lines are directly connected to the input end IN end of pre-amplification circuit.Electric charge 8 materials of popping one's head in are magnetically soft alloy material, and electric charge (electric field) is had to higher sensitivity, and electric charge probe 8 is shaped as circle, and diameter has tri-kinds of 10mm, 20mm, 30mm.Present embodiment adopts copper sheet to pack shielding to the circuit board of pre-amplification circuit, can limit to greatest extent the interference of external electromagnetic signal to circuit, and the pre-amplification circuit after packing is shaped as cylindrical, is of a size of Φ 30 * 100mm.
The structure of the data processing unit 10 that present embodiment adopts, as shown in Figure 4, comprising: analog to digital converter 101 and data buffer 102.The input end of described analog to digital converter 101 is as the output terminal of a sensor input connection unit 9 of data processing unit 10; An input end of the output terminal connection data buffer 102 of described analog to digital converter 101; Another input end of data buffer 102 connects the second output terminal of controller 13 as another input end of data processing unit 10, the input end of an output terminal connection data memory storage of data buffer 102, another output terminal of data buffer 102 connects another input end of display 11.
The analog to digital converter that present embodiment adopts consists of prime amplifier and analog to digital conversion circuit.Prime amplifier is placed between sensor unit 9 and analog to digital conversion circuit, the prime amplifier that present embodiment adopts is the AWA14604 type ICP prime amplifier with 10 times of voltage gains, small-signal can be amplified on fiduciary level, synchronously receive self-potential, electric charge induction and the acoustic emission signal that also amplification sensor unit transmits, and self-potential, electric charge induction harmony launching simulation electric signal after amplifying are sent to analog to digital conversion circuit processing.Self-potential, electric charge induction harmony launching simulation electric signal after analog to digital conversion circuit amplifies for synchronous receiving preamplifier, and these signals are synchronously converted to digital signal send to data buffer 102, the analog to digital conversion circuit that present embodiment adopts is that model is 16 modulus conversion chips of AD976AANZ, and the important technological parameters of AD976AANZ type modulus conversion chip is: the switching time of 16 bit resolutions, 200KSPS sampling percent of pass, differential input, parallel code output, 3.8 μ s.Data buffer 102 receives the digital signal of AD976AANZ pattern number converter and is saved to hard disk 12, for upper layer application, analyze the rule of coal petrography deformation fracture process produces under different loading environments self-potential, electric charge induction and acoustic emission signal, obtain the mutual relationship between three kinds of signals, obtain coal petrography self-potential and charge generation mechanism, for the method that adopts self-potential, electric charge induction and acoustic emission to combine provides laboratory experiment and theoretical foundation to the integrated forecasting of carrying out of mine motive force disaster.The data buffer that the data buffer 102 that present embodiment adopts is IS63LV1024-15TI for model, IS63LV1024-15TI type data buffer is nanosecond highspeed static memory, low in energy consumption, read or write speed is fast, not power-off does not disappear, and need not refresh 128Kbytes.
The controller 13 adopting in present embodiment adopts embedded TT&C system as center sampling controller, and the model of the mainboard of employing is Intel Desktop Board D201GLY, and the CPU of employing is Atom 525 (double-core four threads), and dominant frequency reaches 1800M.Controller 13 is connected with display 11 with the data buffer in data processing unit respectively, controller 13 arranges transmission indicator signal according to operational factor, control the simulating signal of IS63LV1024-15TI type data buffer receiving sensor unit 9 outputs in data processing unit 10, control display 11 and show in real time real-time self-potential, sound, the electric charge induction signal that data processing unit 10 receives, the signal that can simultaneously show 16 passages, also can select a few channel signals to show.According to the setting of operational factor, can control the data acquiring frequency (100kHz is following adjustable) of data processing unit 10, the position of the passage of data acquisition, data preservation and the filename of data preservation.According to the setting of operational factor, controller 13 can be controlled display 11 channel indication signals, signal drawing scope, shows the average of every channel signal and variance etc. simultaneously.
The display 11 adopting in present embodiment is Samsung 152N display, and resolution is 1024x768.Display 11 is for according to the instruction of controller 13, shows the waveform of real-time self-potential, electric charge induction and acoustic emission signal in the 0.5s that data processing unit collects.
What the electromagnetic screen member 14 of present embodiment adopted is copper mesh, make the rectangular parallelepiped of 400mmx400mmx150mm, and be connected with ground, coal petrography sample 1, pressing machine upward pressure head 4, pressing machine downforce 5, the upper cross-over block 2 of pressing machine upward pressure head, the lower cross-over block 3 of pressing machine downforce head, electrode probe to 6, acoustic emission probe 7, electric charge probe 8, sensor unit 9 all cover in electromagnetic screen member, shields the interference of external electromagnetic signal to sensor unit synchronous acquisition self-potential, electric charge induction and acoustic emission signal process.
The synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape of employing present embodiment carries out the method for the synchronous comprehensive monitoring of coal rock deformation rupture process Full wave shape, as shown in Figure 5, starts from step 501.
In step 502, first prepare diameter and aspect ratio and be the cylindrical coal petrography sample of 1: 2, cylindrical coal petrography sample 1 diameter adopting in present embodiment is 50mm, height is 100mm.
In step 503, this cylindrical coal petrography sample 1 is uprightly placed between pressing machine upward pressure head 4 and pressing machine downforce 5, simultaneously at pressing machine upward pressure head 4, pressing machine downforce 5 and the surface of contact of two bottom surfaces of cylindrical coal petrography sample 1, be respectively arranged with the upper cross-over block 2 of pressing machine upward pressure head, the lower cross-over block 3 of pressing machine downforce head, as shown in Figure 1, the material of cross-over block is teflon.
In step 504, electrode probe is connected to the input end of self-potential sensor, the input end that electric charge probe is connected to charge sensor, acoustic emission probe is connected to the input end of calibrate AE sensor.
In step 505, observe joint and the cranny development situation of coal petrography sample, the rule of breaking according to specimen shape and sample, by the acoustic emission probe of the electrode probe of a plurality of self-potential sensors and a plurality of calibrate AE sensors, take and avoid crackle as principle, distribution is arranged near the surface that crack position may appear in coal petrography sample, the electric charge probe of a plurality of charge sensors is distributed simultaneously and is placed near position coal petrography sample;
The position distribution of the sensor probe of present embodiment on coal petrography sample, as shown in Figure 6, electrode probe and acoustic emission probe are all coupling on coal petrography sample by conductive copper glue or conductive silver glue couplant, and are close to adhesive tape and sample; Electric charge probe is 10mm with the distance of coal petrography specimen surface.Wherein, because each self-potential sensor has pair of electrodes probe, in present embodiment, the electrode probe of each self-potential sensor is to arrange in pairs at a distance of 8mm; Wherein first pair to the 3rd pair electrode probe is distributed in along on the axial same straight line of sample, and this straight line of setting their places is 0 ° of axial start line of coal petrography sample 1.Second pair of electrode probe is arranged in the mid point of 0 ° of axial start line, the distance of second pair of electrode probe and first pair of electrode probe, the 3rd pair of electrode probe is 30mm, the distance of first pair of electrode probe and cylindrical coal petrography sample upper surface is 20mm, and the distance of the 3rd pair of electrode probe and cylindrical coal petrography sample lower surface is also 20mm; The 4th pair of electrode probe, the 5th pair of electrode probe are arranged on the intersection point of 90 ° of axial line of cylindrical coal petrography sample, 270 ° of axial line and its middle section line, and the 6th pair of electrode probe is arranged in 180 ° of axial line, apart from 25mm place, coal petrography sample upper surface; First sound transmitting probe, second sound transmitting probe are arranged on 45 ° of axial straight lines of coal petrography sample, wherein first sound transmitting probe is positioned at distance 20mm place, cylindrical coal petrography sample upper surface, and second sound transmitting probe is positioned at distance 20mm place, cylindrical coal petrography sample lower surface.The 3rd acoustic emission probe, fourth sound transmitting probe are arranged on 135 ° of axial straight lines of coal petrography sample, and wherein the 3rd acoustic emission probe is apart from 20mm place, cylindrical coal petrography sample upper surface, and fourth sound transmitting probe is apart from 20mm place, cylindrical coal petrography sample lower surface.Fifth sound transmitting probe, the 6th acoustic emission probe are arranged in 315 ° of axial line, 225 ° of axial line, and fifth sound transmitting probe is positioned at apart from 20mm place, coal petrography sample upper surface, and the 6th acoustic emission probe is apart from 20mm place, coal petrography sample lower surface, the first electric charge is popped one's head in to the 4th electric charge Probe arrangement near the distance cylindrical coal petrography sample of cylindrical coal petrography specimen surface 10mm, wherein the first electric charge is popped one's head in, the second electric charge probe is arranged in 45 ° of axial line of cylindrical coal petrography sample, near the crossing position in 135 ° of axial line and its midsection, tricharged Probe arrangement is in 225 ° of axial line of cylindrical coal petrography sample, and near the position apart from coal petrography sample upper surface 25mm, the 4th electric charge Probe arrangement is in 315 ° of axial line of cylindrical coal petrography sample, and near the position apart from coal petrography sample lower surface 25mm.
In step 506, starting pressure machine, and not loading, because pressing machine has larger noise signal while starting, after equal pressure machine operates steadily, then loads.
In step 507, on controller, acquisition parameter is arranged or adjusted, described acquisition parameter comprises: sample frequency (sample frequency of present embodiment is 100kHz to the maximum, and 500Hz is to adjustable within the scope of 100kHz), sampling channel (sampling channel of present embodiment is 16 passages to the maximum), data are preserved position and data storage file name etc.;
In step 508, startup system, starts pre-self-potential, electric charge induction and the acoustic emission Full wave shape signal that gathers coal petrography sample, and on display, shows in real time but be not saved in hard disk;
Native system can be that 100kHz, sampling channel are 16 o'clock in sample frequency, and Full wave shape acquisition time was over 10 days continuously.
In step 509, the Full wave shape signal waveform showing according to display, judges that noise signal amplitude, whether in tolerance interval, is, performs step 510, no, performs step 507;
In step 510, loading velocity, load mode are set on pressing machine, start-up loading mechanism loads coal petrography sample;
The tolerance interval of the noise signal amplitude in present embodiment is ± 0.001V.
In step 511, according to the instruction of controller, the self-potential collecting, electric charge induction and acoustic emission signal real-time synchronization are sent to data storage device and for upper layer application and display, show;
Upper layer application can be according to the signal data of hard-disc storage, lithology in conjunction with sample, the failure mode of sample, the stress-strain diagram of sample, sample is loaded on to the self-potential of the whole process of destruction, electric charge induction and acoustic emission signal are analyzed, obtain coal rock deformation rupture process self-potential, the Changing Pattern of electric charge induction and acoustic emission, and then the mutual relationship between three kinds of signals of acquisition, obtain coal petrography self-potential and charge generation mechanism, for adopting self-potential, the method that electric charge induction and acoustic emission combine provides laboratory experiment and theoretical foundation to the integrated forecasting of carrying out of mine motive force disaster.
In step 512, after coal petrography sample destroys, stop load maintainer and signals collecting simultaneously.
Although more than described the specific embodiment of the present invention, the those skilled in the art in this area should be appreciated that these only illustrate, and can make various changes or modifications to these embodiments, and not deviate from principle of the present invention and essence.Scope of the present invention is only limited by appended claims.
Claims (10)
1. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape, is characterized in that: comprising: load maintainer, sensor unit, data processing unit, controller, display and data storage device;
Described sensor unit, comprises a plurality of self-potential sensors, a plurality of calibrate AE sensor and a plurality of charge sensor; The input end of described sensor unit connects the electrode probe of a plurality of self-potential sensors simultaneously, an output terminal of the electric charge of the acoustic emission probe of a plurality of calibrate AE sensors, a plurality of charge sensors probe and controller; The electrode probe of described a plurality of self-potential sensors and the acoustic emission probe of a plurality of calibrate AE sensors, take and avoid crackle as principle, is arranged near the position that crackle may appear in coal petrography sample body; The electric charge probe of described a plurality of charge sensors distributes and is placed near the position of coal petrography sample;
An input end of the output terminal connection data processing unit of described sensor unit, an output terminal of data processing unit connects an input end of display, the input end of another output terminal connection data memory storage of data processing unit;
Another input end of the second output terminal connection data processing unit of described controller, the 3rd output terminal of controller connects another input end of display; The input end of described controller carries out man-machine interaction by human-computer interaction interface;
Described data processing unit, comprising: analog to digital converter and data buffer; The input end of described analog to digital converter is as the output terminal of a sensor input connection unit of data processing unit; An input end of the output terminal connection data buffer of described analog to digital converter; Another input end of data buffer connects the second output terminal of controller as another input end of data processing unit, the input end of an output terminal connection data memory storage of data buffer, another output terminal of data buffer connects another input end of display.
2. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, it is characterized in that: coal petrography sample is placed in the loading region of load maintainer, described load maintainer, for for coal petrography sample is loaded, makes coal petrography sample produce the mechanism of deformation fracture.
3. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, it is characterized in that: the electrode probe of self-potential sensor and the acoustic emission probe of calibrate AE sensor directly contact with the surface of the relevant position of rock mass sample respectively, and surface of contact is coupled with couplant.
4. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, it is characterized in that: described sensor unit is used for according to the corresponding steering order of controller, self-potential, electric charge induction and acoustic emission Full wave shape signal that synchronous acquisition coal petrography sample deformation rupture process produces, and synchronously convert analog electrical signal to and send data processing unit to.
5. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, is characterized in that: described controller is used for sending corresponding steering order to sensor unit, data processing unit and display.
6. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, it is characterized in that: described data processing unit is used for according to the corresponding steering order of controller, receive the analog electrical signal that also amplification sensor unit sends, and be converted into digital electric signal, and the digital electric signal after conversion is sent to data storage device stores, be also sent to display simultaneously and show.
7. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, is characterized in that: self-potential, electric charge induction and acoustic emission digital electric signal that described data storage device transmits for receiving and store analog-to-digital conversion module.
8. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, it is characterized in that: described display, for according to the corresponding steering order of controller, carries out simultaneous display to real-time self-potential, electric charge induction and acoustic emission signal Full wave shape.
9. the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape according to claim 1, it is characterized in that: adopt copper mesh, make enclosed type electric magnetic shield member coal petrography sample, load maintainer, sensor unit are all covered in this electromagnetic screen member, shield the interference of external electromagnetic signal to sensor unit synchronous acquisition self-potential, electric charge induction and acoustic emission signal process.
10. adopt the synchronous comprehensive monitor system of coal rock deformation rupture process Full wave shape claimed in claim 1 to carry out the method for the synchronous comprehensive monitoring of coal rock deformation rupture process Full wave shape, it is characterized in that: comprise following concrete steps:
Step 1: the corresponding loading region that coal petrography sample is fixed on to load maintainer; Described load maintainer, for for coal petrography sample is loaded, makes coal petrography sample produce the mechanism of deformation fracture;
Near step 2: arrange the electrode probe of self-potential sensor, the acoustic emission probe of calibrate AE sensor in coal petrography sample body, meanwhile, the electric charge probe of charge sensor is settled in position coal petrography sample;
According to the shape of coal petrography sample to be monitored, joint, cranny development situation and the rule of breaking, by the acoustic emission probe of the electrode probe of a plurality of self-potential sensors and a plurality of calibrate AE sensors, take and avoid crackle as principle, distribution is arranged near the position that crackle may appear in coal petrography sample body, the electric charge probe of a plurality of charge sensors is distributed simultaneously and is placed near position coal petrography sample;
Step 3: on controller, acquisition parameter is arranged or adjusted, described acquisition parameter comprises: sample frequency, sampling channel, data are preserved position and data storage file name;
Step 4: startup system, starts pre-self-potential, electric charge induction and the acoustic emission Full wave shape signal that gathers coal petrography sample, and show in real time on display but do not preserve;
Step 5: the Full wave shape signal waveform showing according to display, judge that noise signal amplitude, whether in tolerance interval, is, perform step 6, no, perform step 3;
Step 6: loading velocity, load mode are set on load maintainer, and start-up loading mechanism loads coal petrography sample;
Step 7: according to the corresponding steering order of controller, by the self-potential collecting, electric charge induction and acoustic emission signal real time data synchronization be sent to data storage device for upper layer application, go back the Full wave shape that synchronized transmission to display carries out signal simultaneously and show;
Step 8: after coal petrography sample destroys, simultaneously stop load maintainer and signals collecting.
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