CN201508417U - Tunnel or pit advance geological prediction induced polarization time-domain receiver equipment - Google Patents
Tunnel or pit advance geological prediction induced polarization time-domain receiver equipment Download PDFInfo
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- CN201508417U CN201508417U CN2009202271479U CN200920227147U CN201508417U CN 201508417 U CN201508417 U CN 201508417U CN 2009202271479 U CN2009202271479 U CN 2009202271479U CN 200920227147 U CN200920227147 U CN 200920227147U CN 201508417 U CN201508417 U CN 201508417U
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Abstract
The utility model relates to tunnel or pit advance geological prediction induced polarization time-domain receiver equipment which enhances the properties of induced polarization time-domain receiver equipment, has stronger anti-interference capability, is more suitable for the detecting in tunnels and improves the accuracy of tunnel advance geological prediction. The structure of the utility model is that the tunnel or pit advance geological prediction induced polarization time-domain receiver equipment comprises a measured signal input end, an anti-interference and trapped wave resistance circuit, a changeable gain difference input amplifier, a trapped wave low-pass filter, a second stage gain amplifier, a polarity discrimination and signal polarity turnover circuit, a photoelectricity isolating circuit, a central processing unit and a technical grade personal computer, which are connected in turn, meanwhile, the photoelectricity isolating circuit respectively controls the changeable gain difference input amplifier and the second stage gain amplifier through a first stage gain controller and a second stage gain controller, and the central processing unit is used for receiving the stop pulses coming from transmitting equipment.
Description
Technical field
The utility model relates in a kind of tunnel or the tunnel time domain advanced prediction technology based on induced polarization, specifically a kind of tunnel or tunnel induced polarization time domain receiver equipment for advance geologic prediction.
Background technology
A large amount of Tunnel Engineering are arranged in China's water conservancy and hydropower, the field of traffic, the Tunnel Engineering geologic hazard is the key factor of restriction constructing tunnel, often because the tunnel excavation front geological condition is not clear, unforeseen geologic hazard often appears, as gushing water, prominent mud, cave in etc.Carry out in the process of coal mining in the down-hole, often also can run into geologic hazards such as old empty water, the consequence that these geologic hazards cause is gently then to destroy by rush of water facility, floods the tunnel, and normal construction is forced to interrupt; Heavy then cause great casualties, produce enormous economic loss, even therefore some underground works can be forced to suspend or relocate.So, for these geologic hazards make forward probe or the forecast just seem necessary, also highly significant.
Induced polarization (IP, Introduced Polarization) method is as a kind of important electromagnetic survey method, is widely used in resource exploration and the engineering investigation with its unique advantage (economic, harmless, fast reach abundant information etc.).Induced polarization method is to reach the purpose of surveying forecast by the effect of induced polarization that receives and analyze various anomalous bodys.It has the bad water body reflection in pair tunnel sensitive characteristics, can be used to forecast work square gushing water anomalous body and water yield situation thereof in front.In the advance geologic prediction of tunnel and tunnel, induced polarization method to the tunnel water body poorly the forecast of plastid have a significant effect.We can say that induced polarization is one of a kind of method the most promising in present all forward probe methods.
The direct water detection of time-domain induced polarization method is the method with China independent intellectual property right of China physical prospecting worker in the mid-1970s collective utility model in last century.It mainly is to utilize underground water induced polarization mechanism, a new method of formation.Its principle be on ground to the big electric current of one of underground supply, it will make underground different rock or water body be stimulated and produce polarization, the rock mass of polarization or water body polarization secondary electrical field obtain the parameters such as attenuation coefficient of polarizability and polarization current by reception.Last century, secondary time difference in induced polarization appearred in the mid-80.This method is as excitation current to the underground electric current of different sizes that infeeds respectively, when measuring partly the declining of polarized potential respectively, poor when the polarization of measuring the power supply of big electric current partly declines and during partly the declining of little electric current power supply polarization, contain free water the water-bearing zone difference on the occasion of, and water cut is big more, and the secondary time difference value is big more.Measured value by known conditions is relevant, can calculate water cut.Through tens building sites, up to a hundred borings are all succeedd.
For square water body and water yield thereof in face of the forecast work, the receiver of induced polarization is a very crucial part, and it has influence on the collection of data and the explanation of final forecast achievement.Though induced polarization application on the ground is comparative maturity, but the application on subterranean tunnel or tunnel is generally speaking just preliminary trial also, because the tunnel is different with the acquisition environment on ground, ground location be the interpretation problems of a semispace basically, this helps the processing and the decipher of induced polarization; Detection in most of tunnel then is equivalent to a nearly total space interpretation problems, and this has just increased the multi-solution of induced polarization, is unfavorable for very much various unusual judgements; In addition,, make measuring accuracy be affected, need do various processing, but its final explanation results can be subjected to very big influence because the secondary field signal of induced polarization is very faint and be subject to interference.Therefore, the development that is suitable for the induced polarization time domain receiver equipment of tunnel advanced prediction has just become a key.
The utility model content
The purpose of this utility model is exactly in order to address the above problem, a kind of tunnel or tunnel induced polarization time domain receiver equipment for advance geologic prediction are provided, it is on the research basis of existing induced polarization transmitter it to be carried out certain improvement, attempt to improve the performance of induced polarization time domain receiver equipment, has stronger antijamming capability, be adapted to the detection in the tunnel more, improve the accuracy of tunnel geological forecast.
For achieving the above object, the utility model adopts following technical proposals:
A kind of tunnel or tunnel induced polarization time domain receiver equipment for advance geologic prediction, it comprises measured signal input end, anti-interference and trap circuit, variable-gain differential input amplifier, trap low-pass filter, second level gain amplifier, polarity discriminating and signal polarity reverse circuit, photoelectric isolating circuit, CPU and the technical grade PC that connects successively; Simultaneously, photoelectric isolating circuit is also respectively by first order gain controller control variable-gain differential input amplifier, by second level gain controller control second level gain amplifier; CPU receives the stop pulse from transmitter.
Described anti-interference and trap circuit comprises that common mode suppresses circuit and one-level trap circuit, and wherein, common mode suppresses the interference of circuit absorbing high-frequency signal; The one-level trap circuit is passive 50Hz trap circuit, and damping capacity is not less than-42dB.
Described trap low-pass filter is the passive 50Hz trap circuit of secondary, and its damping capacity is not less than-42dB.
Described photoelectric isolating circuit is isolated by analog linearity photoelectricity and digital photoelectricity two isolated parts is formed.
Described polarity discriminating and signal polarity reverse circuit are positive signal with the negative polarity conversion of signals automatically, and the zone bit of positive-negative polarity is represented in output simultaneously.
Described technical grade PC carries out data analysis, drawing and preservation, and discharge time and sampling interval are set before the sampling, shows charging, discharge curve; Demonstration can show discharge parameter: polarizability, the dough softening, rate of induced polarization, sampled value when partly declining, and when mark partly declines on curve, and provide 5 to show ranges; Preserve discharge curve and discharge and recharge sampled value and open the file of having preserved, check information such as sampled value, discharge curve, engineering name, gear, discharge parameter.
Induced polarization time domain receiver equipment of the present utility model, the common mode that comprises its hardware circuit suppresses circuit, one-level 50Hz trap circuit, variable-gain differential input amplifier, secondary 50Hz trap circuit, 8 rank 10Hz low-pass filters, secondary gain amplifier, polarity discriminating and signal polarity reverse circuit, photoelectric isolating circuit, CPU, RS232 interface etc., and the technical grade PC is responsible for the analysis, drawing, preservation of data etc. in addition.
It mainly is the interference of absorbing high-frequency signal that common mode suppresses circuit.
The 50Hz trap circuit, the passive 50Hz trap circuit of one-level, damping capacity is not less than-42dB; Insert the passive 50Hz trap circuit in the second level behind first order amplifier, its damping capacity is not less than-42dB.Therefore, direct current amplifier to the 50Hz power frequency component have-84bB～-damping capacity of 4dB.
To several volts, span scope reaches 80dB (10000 times) from tens microvolts for variable-gain differential input amplifier, the amplitude of measured signal.The signal that uses fixed gain to measure so big variation range obviously has great difficulty.Therefore, designed the adaptive gain amplifying circuit.System according to after the data analysis that records automatically the increase of ride gain still reduce, make 12 ADC converter be equivalent to the ADC of 261/2 bit resolution, the minimum voltage of differentiating has reached 0.051uV.
Photoelectric isolating circuit is the interference of avoiding digital processing part pair amplifier part, adopts the analog photoelectricity isolation technology between numerical portion and simulation part divide; Numeral adopts independently power supply respectively with the simulation part simultaneously.
Polarity discriminating and signal polarity reverse circuit, because of input signal may have bipolarity, amplifier is provided with the polarity automatic identification circuit, is positive signal with the negative polarity conversion of signals automatically, and the zone bit of positive-negative polarity is represented in output simultaneously.
The analysis of technical grade PC, drawing and preservation can be provided with discharge time and sampling interval (default: 30s and 500ms) before the sampling, show charging, discharge curve; Demonstration can show discharge parameter: polarizability, the dough softening, rate of induced polarization, sampled value such as when partly declining, and when mark partly declines on curve, and can select 5 to show ranges; Can preserve discharge curve and discharge and recharge sampled value and can open the file of having preserved, check information such as sampled value, discharge curve, engineering name, gear, discharge parameter.
The measurement range of five gears as shown in table 1:
| Input signal peak value scope | Enlargement factor | With last with gain per stage added value (dB) |
| 200mV～2000mV | 1 | 0 |
| 20mV～ |
10 | 20 |
| 2mV～20mV | 100 | 20 |
| 200uV～2mV | 1000 | 20 |
| 20uV～200uV | 10000 | 20 |
Actual application of the present utility model is simple to operate:
1〉display interface that opens a terminal is filled in " engineering name "
2〉open port---" opening port " button, communicating to connect of foundation and acquisition system: button becomes " close port " " operation indicating " and shows the situation that is connected: success or failure, Icon Color demonstration current state above the button (red: close, green: as to open)
3〉being set the sampling time---" sampling time is set " button is provided with sampling time of discharge: Icon Color shows that current state (indigo plant: be provided with, green: as to be provided with) default value is: 30s above the button
4〉sampling interval being set---" sampling interval is set " button is provided with time interval of discharge and charging sampling: Icon Color shows that current state (indigo plant: be provided with, green: as to be provided with) default value is: 500ms above the button
5〉begin sampling---" beginning sampling " button, charging process is sampled: button becomes " finishing sampling "; Icon Color demonstration current state above the button (red: close, green: as to open), at this moment: a) start acquisition system and sample, show charging sampled value and charging curve; B) after charging finishes, acquisition system feedback discharge commencing signal enters discharge condition c automatically) under dotted state, show discharge sampled value and discharge curve, and calculate and demonstration discharge parameter d) after discharge off, acquisition system feedback discharge end signal stops to accept sampled value
6〉stop sampling---stop sampling action, so that preservation curve and sampled value stop the sampling action of sampling system;
7〉preserve curve and data---" preservation data " button, the sampled value that can preserve discharge curve and discharge and recharge this moment, be kept at " d: " under the d packing catalogue, by name:
Curve: " engineering name "+" current date "+_+" measurement number of times "+_ curve+.jpg
Data: " engineering name "+" current date "+_+" measurement number of times "+_ data+.xls
8〉finish one-shot measurement process---" clearing screen ", " close port "
Clear screen---remove sampled value and sampling curve
Communicating by letter of close port---disconnection and acquisition system
9〉quitting a program---" withdrawing from " button is annotated: when observing discharge curve, can change the observation range at any time
Under the state of " close port ", can open the file of having preserved (data file or picture file), at this moment can reply the state before preserving: charging and discharging sampled value, discharge curve, observation range, engineering name and each discharge parameter
The beneficial effects of the utility model are: this equipment can be realized the polarization compensation automatically, the variation adjustment zeroing signal of the initial polarization voltage of importing from motion tracking after the system power-up, the dc point of amplifier is remained on 0, when system formally starts work, stop to follow the tracks of and adjust and remain on the preceding up-to-date trace point once of startup.This equipment antijamming capability is strong, and the input stage of circuit has the passive 50Hz trap circuit of one-level, inserts the passive 50Hz trap circuit in the second level behind first order amplifier, can suppress the interference of 50Hz power frequency component greatly; Input stage is provided with the interference that high frequency common mode/differential mode high frequency interference suppresses circuit absorbing high-frequency signal; Be provided with the fertile low-pass filter now of 8 rank Barts simultaneously in the circuit, in addition, adopt the analog photoelectricity isolation technology and adopt independently power supply respectively between numerical portion and simulation part divide, can avoid the interference of digital processing part pair amplifier part carefully.This device measuring range is big, and measuring accuracy height, gain voltage signal are 1 (0dB)～10000 times (80dB), can amplify ± 20uV～± direct current signal of 2000mV.This equipment aspect is effective, and amplifier is provided with the polarity automatic identification circuit, is positive signal with the negative polarity conversion of signals automatically, and the zone bit of positive-negative polarity is represented in output.This equipment shows on screen with this synchronizing pulse sampled data calculating relevant parameters constantly and shows charging and discharging curve in real time in addition, preserves raw data and discharge curve simultaneously, the authenticity of aspect user's judgment data.
Description of drawings
Fig. 1 is the utility model time domain receiving equipment system constructing schematic diagram.
Wherein, 1. measured signal input end, 2. anti-interference and trap circuit, 3. variable-gain differential input amplifier, 4. trap low-pass filter, 5. second level gain amplifier, 6. polarity discriminating and signal polarity reverse circuit, 7. photoelectric isolating circuit, 8.CPU, 9. technical grade PC, 10. first order gain controller control, 11. second level gain controller, 12. stop pulses.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Among Fig. 1, it comprises measured signal input end 1, anti-interference and trap circuit 2, variable-gain differential input amplifier 3, trap low-pass filter 4, second level gain amplifier 5, polarity discriminating and signal polarity reverse circuit 6, photoelectric isolating circuit 7, CPU8 and the technical grade PC 9 that connects successively; Simultaneously, photoelectric isolating circuit 7 is also respectively by first order gain controller 10 control variable-gain differential input amplifiers 3, by second level gain controller 11 control second level gain amplifiers 5; CPU8 receives the stop pulse 12 from transmitter.
Anti-interference and trap circuit 2 comprises that common mode suppresses circuit and one-level trap circuit, and wherein, common mode suppresses the interference of circuit absorbing high-frequency signal; The one-level trap circuit is passive 50Hz trap circuit, and damping capacity is not less than-42dB.
Trap low-pass filter 4 is the passive 50Hz trap circuit of secondary, and its damping capacity is not less than-42dB.
Polarity discriminating and signal polarity reverse circuit 6 are positive signal with the negative polarity conversion of signals automatically, and the zone bit of positive-negative polarity is represented in output simultaneously.
Claims (5)
1. tunnel or tunnel induced polarization time domain receiver equipment for advance geologic prediction, it is characterized in that it comprises measured signal input end, anti-interference and trap circuit, variable-gain differential input amplifier, trap low-pass filter, second level gain amplifier, polarity discriminating and signal polarity reverse circuit, photoelectric isolating circuit, CPU and the technical grade PC that connects successively; Simultaneously, photoelectric isolating circuit is also respectively by first order gain controller control variable-gain differential input amplifier, by second level gain controller control second level gain amplifier; CPU receives the stop pulse from transmitter.
2. tunnel as claimed in claim 1 or tunnel induced polarization time domain receiver equipment for advance geologic prediction, it is characterized in that, described anti-interference and trap circuit comprises that common mode suppresses circuit and one-level trap circuit, and wherein, common mode suppresses the interference of circuit absorbing high-frequency signal; The one-level trap circuit is passive 50Hz trap circuit, and damping capacity is not less than-42dB.
3. tunnel as claimed in claim 1 or tunnel induced polarization time domain receiver equipment for advance geologic prediction is characterized in that, described trap low-pass filter is the passive 50Hz trap circuit of secondary, and its damping capacity is not less than-42dB.
4. tunnel as claimed in claim 1 or tunnel induced polarization time domain receiver equipment for advance geologic prediction is characterized in that, described photoelectric isolating circuit is isolated by analog linearity photoelectricity and digital photoelectricity two isolated parts is formed.
5. tunnel as claimed in claim 1 or tunnel induced polarization time domain receiver equipment for advance geologic prediction, it is characterized in that, described polarity discriminating and signal polarity reverse circuit are positive signal with the negative polarity conversion of signals automatically, and the zone bit of positive-negative polarity is represented in output simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202271479U CN201508417U (en) | 2009-09-22 | 2009-09-22 | Tunnel or pit advance geological prediction induced polarization time-domain receiver equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202271479U CN201508417U (en) | 2009-09-22 | 2009-09-22 | Tunnel or pit advance geological prediction induced polarization time-domain receiver equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201508417U true CN201508417U (en) | 2010-06-16 |
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| CN2009202271479U Expired - Fee Related CN201508417U (en) | 2009-09-22 | 2009-09-22 | Tunnel or pit advance geological prediction induced polarization time-domain receiver equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672930B (en) * | 2009-09-22 | 2011-04-20 | 山东大学 | Induced polarization time domain receiver equipment for advance geologic prediction for tunnel or underground tunnel |
| CN102176059A (en) * | 2011-01-18 | 2011-09-07 | 山东大学 | Composite induced polarization instrument for advanced geological prediction of tunnel or gallery |
| CN102353994A (en) * | 2011-06-22 | 2012-02-15 | 上海艾都能源科技有限公司 | High-precision natural electric field geophysical prospecting measurement instrument |
| WO2014110689A1 (en) * | 2013-01-15 | 2014-07-24 | 山东大学 | Three-dimensional focus induced polarization device for advanced geological forecast of water burst source in underground construction |
| CN105738942A (en) * | 2016-03-09 | 2016-07-06 | 东北大学 | Mine rock structure evolution three-dimension continuous exploration system and method for exploitation process |
| CN109143378A (en) * | 2018-08-02 | 2019-01-04 | 中煤科工集团西安研究院有限公司 | A kind of secondary temporal difference method of the bed-parallel advanced detection of water bearing in coal mine roadway |
-
2009
- 2009-09-22 CN CN2009202271479U patent/CN201508417U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672930B (en) * | 2009-09-22 | 2011-04-20 | 山东大学 | Induced polarization time domain receiver equipment for advance geologic prediction for tunnel or underground tunnel |
| CN102176059A (en) * | 2011-01-18 | 2011-09-07 | 山东大学 | Composite induced polarization instrument for advanced geological prediction of tunnel or gallery |
| CN102176059B (en) * | 2011-01-18 | 2013-03-06 | 山东大学 | Composite induced polarization instrument for advanced geological prediction of tunnel or gallery |
| CN102353994A (en) * | 2011-06-22 | 2012-02-15 | 上海艾都能源科技有限公司 | High-precision natural electric field geophysical prospecting measurement instrument |
| WO2014110689A1 (en) * | 2013-01-15 | 2014-07-24 | 山东大学 | Three-dimensional focus induced polarization device for advanced geological forecast of water burst source in underground construction |
| US9256003B2 (en) | 2013-01-15 | 2016-02-09 | Shan Dong University | Three-dimensional focusing induced polarization equipment for advanced geological prediction of water inrush disaster source in underground engineering |
| CN105738942A (en) * | 2016-03-09 | 2016-07-06 | 东北大学 | Mine rock structure evolution three-dimension continuous exploration system and method for exploitation process |
| CN109143378A (en) * | 2018-08-02 | 2019-01-04 | 中煤科工集团西安研究院有限公司 | A kind of secondary temporal difference method of the bed-parallel advanced detection of water bearing in coal mine roadway |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100616 Termination date: 20110922 |