CN108710152B - Tunnel forward probe system and detection method based on binary channels amplitude-modulated wave - Google Patents
Tunnel forward probe system and detection method based on binary channels amplitude-modulated wave Download PDFInfo
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- CN108710152B CN108710152B CN201810432569.3A CN201810432569A CN108710152B CN 108710152 B CN108710152 B CN 108710152B CN 201810432569 A CN201810432569 A CN 201810432569A CN 108710152 B CN108710152 B CN 108710152B
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
Abstract
The invention discloses a kind of tunnel forward probe system and detection method based on binary channels amplitude-modulated wave, the system are made of signal generating module, two-way constant current source module and fibre optic current sensor.The amplitude-modulated wave of signal generating module generation two-way different carrier frequencies, it is separately input to two constant current source modules, the output electric current of constant current source module directly connects on shield all the way, and another way connects in the same point of shield after inversely passing through sensing fiber ring with the output of first via constant-current source.Sensing fiber ring is wrapped in main drive shaft and holds, and the ground of constant current source module connects on the anchor pole of tunnel rear certain distance.The output signal of fibre optic current sensor obtains shield electric current and cutterhead electric current after bandpass filtering, envelope detection, A/D sampling simultaneously.Compared with traditional unidirectional power supply and alternative method power supply, the present invention preferably solves the problems, such as that fibre optic current sensor measurement coefficient changes over time, and improves the detection reliability of system.
Description
Technical field
The invention belongs to geology advanced detection technology fields, use binary channels amplitude-modulated wave more particularly, to a kind of, simultaneously
The geology forward probe system and detection method that shield and cutterhead electric current to complete-section tunnel boring machine measure.
Background technique
Electrical survey (-ing) is a kind of geological exploration method that application is wider, and this method in geologic body by applying intensity one
It is fixed, the adjustable electric current of frequency, the different characteristic presented under the electric field according to different geologic bodies (resistivity and induced polarization rate),
To judge the water content or other information of geologic body.
2002, German GEO S.R.L. applied the method in rock tunnel(ling) machine (Tunnel Boring Machine, TBM)
On, with the cutterhead and shield of TBM, electric current is conveyed into geologic body as detection electrode, for forecasting the geology on tunneling direction
Situation, this method help larger in terms of improving engineering safety coefficient.
In practical projects, people are often more concerned with the geological state on tunneling direction, it is therefore desirable to cutterhead electric current
Intensity measures, but the cutterhead of TBM and shield are to hold to link together by main drive shaft, conventional means can not to cutterhead and
It carries out insulating between shield and directly measures cutterhead electric current.Fibre-optic current shielding tunnel forward probe system is devised thus,
When measurement by Optical Fiber Winding on main drive shaft is held, it is wrapped in the optical fiber that main drive shaft is held and forms sensing fiber ring, then wearing
The electric current for crossing sensing fiber ring can be measured, and measurement result indicates U=kI in the form of measuring voltage U, be proportional to
The electric current I held across main drive shaft, proportionality coefficient k.
But in the application, the measurement scale coefficient k of fibre optic current sensor is not unalterable, by temperature, light
The many factors joint effect such as fine state, ambient vibration, changes at any time, so that being increased by the calculated I error of U and k
Greatly, the accurate judgement to geological state is influenced.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of tunnels based on binary channels amplitude-modulated wave
Thus road forward probe system and detection method solve the fibre optic current sensor measurement coefficient for measuring probe current intensity
The technical issues of measurement error increases caused by changing over time.
To achieve the above object, according to one aspect of the present invention, a kind of tunnel based on binary channels amplitude-modulated wave is provided
Forward probe system, comprising: signal generating module, two-way constant current source module, fibre optic current sensor and signal processing module；
The signal generating module, frequency modulating signal is identical for generating, the different two-way amplitude-modulated wave letter of carrier frequency
Number；
The two-way constant current source module, for generating the two-way driving current for being proportional to the two-way amplitude modulation wave voltage signal
Signal, wherein first via driving current signal is connected on shield, and the second tunnel driving current signal inversely passes through sensing fiber ring
After be connected on shield；Respectively some electric current passes through sensing fiber ring to this two-way driving current signal, and produces wherein
The optical signal of raw different carrier frequencies；
The fibre optic current sensor, the output optical signal for that will pass through the sensing fiber ring pass through photoelectric conversion,
Obtain the detection electric signal comprising two carrier frequencies；
The signal processing module, for by it is described include that two carrier frequency detectable signals are separated by bandpass filtering,
Then two-way measurement voltage signal is obtained after envelope detection and A/D sampling respectively, wherein the two-way measurement voltage signal
In first via measurement voltage signal reflect the size of cutterhead electric current, the second drive test amount in the two-way measurement voltage signal
Voltage signal reflects the size of shield electric current.
Preferably, it is I that the current amplitude of the two-way constant-current source output signal of the two-way constant current source module is equal0, connect
On the same tie point of shield.
Preferably, the first via measurement voltage signal is U1=kI1, second tunnel measurement voltage signal is U2=k
(I0-I1)=kI2, wherein I1For the electric current for flowing to cutterhead by base bearing, that reflects the geology of TBM front geological body letters
Breath, I2For the electric current for flowing to lithosome from shield, that reflects the geological information of side geologic body, k is proportionality coefficient.
Preferably, the electric current I of cutterhead is flowed to1ForFlow to the electric current I of shield2For
It is another aspect of this invention to provide that providing a kind of tunnel forward probe method based on binary channels amplitude-modulated wave, wrap
It includes:
It is identical to generate frequency modulating signal, the different two-way amplitude-modulated wave signal of carrier frequency；
The two-way driving current letter for being proportional to the two-way amplitude modulation wave voltage signal is generated by the two-way amplitude-modulated wave signal
Number, wherein first via driving current signal is connected on shield, after the second tunnel driving current signal inversely passes through sensing fiber ring
It is connected on shield；
Photoelectric conversion will be passed through by the output signal of the sensing fiber ring, obtains the detection comprising two carrier frequencies
Electric signal；
By the detection electric signal for including two carrier frequencies by bandpass filtering separation, then examined respectively by envelope
Two-way measurement voltage signal is obtained after involving A/D sampling, wherein the first via in the two-way measurement voltage signal measures voltage
Signal reflects the size of cutterhead electric current, and the second tunnel measurement voltage signal in the two-way measurement voltage signal reflects shield
The size of electric current.
Preferably, it is I that the current amplitude of the two-way constant-current source output signal is equal0, meet the same company in shield
On contact.
Preferably, the first via measurement voltage signal is U1=kI1, second tunnel measurement voltage signal is U2=k
(I0-I1)=kI2, wherein I1For the electric current for flowing to cutterhead by base bearing, that reflects the geology of TBM front geological body letters
Breath, I2For the electric current for flowing to lithosome from shield, that reflects the geological information of side geologic body, k is proportionality coefficient.
Preferably, the electric current I of cutterhead is flowed to1ForFlow to the electric current I of shield2For
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) amplitude-modulated wave method is used, interference of the strong vibration to fibre optic current sensor of construction site is able to suppress, improves and surveys
The stability of amount system.
(2) two-way current source supply method is used, fibre optic current sensor measurement scale coefficient k time-varying is eliminated and measurement is tied
The influence of fruit improves the reliability of system.
Detailed description of the invention
Fig. 1 is that a kind of structure of tunnel forward probe system based on binary channels amplitude-modulated wave provided in an embodiment of the present invention is shown
It is intended to.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The present invention devises a kind of use binary channels amplitude-modulated wave, while measuring the tunneling boring hard rock tunnel of shield and cutterhead electric current
Road development machine (Tunnel Boring Machine, TBM) geology forward probe system and detection method are carried using two-way difference
Input signal of the amplitude-modulated signal of wave frequency rate as constant current source module, the output of constant current source module are separately input to cutterhead and shield
On, while the current signal of cutterhead and shield is measured, become at any time to eliminate the measurement scale system of fibre optic current sensor
The influence of change improves the reliability of detection.
It is a kind of tunnel forward probe system based on binary channels amplitude-modulated wave provided in an embodiment of the present invention as shown in Figure 1
Structural schematic diagram, comprising: signal generating module, two-way constant current source module, fibre optic current sensor and signal processing module；
Signal generating module, frequency modulating signal is identical for generating, the different two-way amplitude-modulated wave signal of carrier frequency；
Two-way constant current source module, for generating the two-way driving current letter for being proportional to the two-way amplitude modulation wave voltage signal
Number, wherein first via driving current signal is connected on shield, after the second tunnel driving current signal inversely passes through sensing fiber ring
It is connected on shield；Respectively some electric current passes through sensing fiber ring to this two-way driving current signal, and generates wherein
The optical signal of different carrier frequencies；
Specifically, generating frequency modulating signal by signal generating module is f0, carrier frequency is respectively f1And f2Two-way tune
Amplitude wave signal, carrier frequency f1Amplitude-modulated wave signal is input in first via constant current source module, first via constant current source module it is defeated
It is galvanically connected on shield out；Carrier frequency is f2Amplitude-modulated wave signal is input in the second constant current source module, the second road constant-current source
The output electric current of module is connected on shield after inversely passing through sensing fiber ring, and the ground of two-way constant current source module terminates at tunnel
On the anchor pole of road rear certain distance.Specific connection type is as shown in Fig. 1 in Detailed description of the invention.
In embodiments of the present invention, the current amplitude of the two-way constant-current source output signal of two-way constant current source module is equal is
I0, connect on the same tie point of shield.
Fibre optic current sensor is obtained for the output optical signal of sensing fiber ring to be passed through photoelectric conversion comprising two
The detection electric signal of carrier frequency；
Wherein, sensing fiber ring is wrapped in main drive shaft and holds.
Signal processing module, the detection electric signal for that will include two carrier frequencies are separated by bandpass filtering, then
Two-way measurement voltage signal is obtained after envelope detection and A/D sampling respectively, wherein first in two-way measurement voltage signal
Road measurement voltage signal reflects the size of cutterhead electric current, the second tunnel measurement voltage signal reflection in two-way measurement voltage signal
The size of shield electric current.
Specifically, it is f that the detection electric signal comprising two carrier frequencies, which passes through centre frequency,1Bandpass filtering, envelope detection
And A/D sampling, obtain first via measurement voltage signal；The detection electric signal is f by centre frequency simultaneously2Bandpass filtering, packet
Network detection and A/D sample to obtain the second tunnel measurement voltage signal.
In embodiments of the present invention, first via measurement voltage signal is U1=kI1, the second measurement voltage signal is U2=k
(I0-I1)=kI2, wherein I0=I1+I2, I1Electric current to flow to cutterhead by base bearing leads to the preceding spy electric current of geologic body,
That reflects the geological information of TBM front geological body, I2For the electric current for flowing to lithosome from shield, that reflects side geologic bodies
Geological information, k is proportionality coefficient.
In embodiments of the present invention, by first via measurement voltage signal and the second available flow direction of tunnel measurement voltage signal
The electric current I of cutterhead1ForFlow to the electric current I of shield2For
Due to voltage value U1And U2Measurement obtains simultaneously, assumes that fibre optic current sensor is surveyed compared to interleaved power method
Measure that proportionality coefficient k is constant within a very short time, can really realize through the invention the measurement of cutterhead electric current and shield electric current with
The fibre optic current sensor proportionality coefficient k changed over time is unrelated.
The tunnel forward probe method based on binary channels amplitude-modulated wave that the present invention also provides a kind of, comprising:
It is identical to generate frequency modulating signal, the different two-way amplitude-modulated wave signal of carrier frequency；
In embodiments of the present invention, frequency modulating signal phase can be generated by signal generating module in hardware realization
Together, the different two-way amplitude-modulated wave signal of carrier frequency.
The two-way driving current signal for being proportional to two-way amplitude modulation wave voltage signal is generated by two-way amplitude-modulated wave signal, wherein
First via driving current signal is connected on shield, and the second tunnel driving current signal is connected to shield after inversely passing through sensing fiber ring
On shield；
In embodiments of the present invention, can be believed by two-way constant current source module by two-way amplitude modulation wave voltage in hardware realization
It number generates and to be proportional to the two-way driving current signal of the voltage signal.
Photoelectric conversion will be passed through by the output optical signal of sensing fiber ring, obtains two-way detectable signal；
In embodiments of the present invention, sensing fiber ring can will be passed through by fibre optic current sensor in hardware realization
Output signal passes through photoelectric conversion, obtains the detection electric signal comprising two carrier frequencies.
Detection electric signal comprising two carrier frequencies is separated by bandpass filtering, then respectively by envelope detection and
Two-way measurement voltage signal is obtained after A/D sampling, wherein the first via measuring signal in two-way measurement voltage signal reflects knife
The size of disk electric current, the second tunnel measurement voltage signal in two-way measurement voltage signal reflect the size of shield electric current.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of tunnel forward probe system based on binary channels amplitude-modulated wave characterized by comprising signal generating module, double
Road constant current source module, fibre optic current sensor and signal processing module；
The signal generating module, frequency modulating signal is identical for generating, the different two-way amplitude-modulated wave signal of carrier frequency；
The two-way constant current source module, for generating the two-way driving current letter for being proportional to the two-way amplitude modulation wave voltage signal
Number, wherein first via driving current signal is connected on shield, after the second tunnel driving current signal inversely passes through sensing fiber ring
It is connected on shield；Respectively some electric current passes through sensing fiber ring to this two-way driving current signal, and generates wherein
The optical signal of different carrier frequencies；
The fibre optic current sensor, the output optical signal for that will pass through the sensing fiber ring are obtained by photoelectric conversion
Detection electric signal comprising two carrier frequencies；
The signal processing module, for by it is described include that two carrier frequency detectable signals are separated by bandpass filtering, then
Two-way measurement voltage signal is obtained after envelope detection and A/D sampling respectively, wherein in the two-way measurement voltage signal
First via measurement voltage signal reflects the size of cutterhead electric current, the second drive test amount voltage in the two-way measurement voltage signal
Signal reflects the size of shield electric current.
2. system according to claim 1, which is characterized in that the two-way constant-current source of the two-way constant current source module exports letter
Number current amplitude it is equal be I0, connect on the same tie point of shield.
3. system according to claim 2, which is characterized in that the first via measurement voltage signal is U1=kI1, described
Second tunnel measurement voltage signal is U2=k (I0-I1)=kI2, wherein I1For the electric current for flowing to cutterhead by base bearing, reflection
The geological information of TBM front geological body, I2For the electric current for flowing to lithosome from shield, that reflects the geology of side geologic body
Information, k are proportionality coefficient.
4. system according to claim 3, which is characterized in that flow to the electric current I of cutterhead1ForFlow to shield
Electric current I2For
5. a kind of tunnel forward probe method based on binary channels amplitude-modulated wave characterized by comprising
It is identical to generate frequency modulating signal, the different two-way amplitude-modulated wave signal of carrier frequency；
The two-way for being proportional to the two-way amplitude modulation wave voltage signal is generated by constant current source module by the two-way amplitude-modulated wave signal
Driving current signal, wherein first via driving current signal is connected on shield, and the second tunnel driving current signal inversely passes through biography
It is connected on shield after sense fiber optic loop；
Photoelectric conversion will be passed through by the output signal of the sensing fiber ring, obtains the detection telecommunications comprising two carrier frequencies
Number；
By it is described include that the detection electric signal of two carrier frequencies is separated by bandpass filtering, then respectively by envelope detection and
Two-way measurement voltage signal is obtained after A/D sampling, wherein the first via measurement voltage signal in the two-way measurement voltage signal
The size of cutterhead electric current is reflected, the second tunnel measurement voltage signal in the two-way measurement voltage signal reflects shield electric current
Size.
6. according to the method described in claim 5, it is characterized in that, the current amplitude of the two-way constant current output signal is equal
For I0, connect on the same tie point of shield.
7. according to the method described in claim 6, it is characterized in that, the first via measurement voltage signal is U1=kI1, described
Second tunnel measurement voltage signal is U2=k (I0-I1)=kI2, wherein I1For the electric current for flowing to cutterhead by base bearing, reflection
The geological information of TBM front geological body, I2For the electric current for flowing to lithosome from shield, that reflects the geology of side geologic body
Information, k are proportionality coefficient.
8. the method according to the description of claim 7 is characterized in that flowing to the electric current I of cutterhead1ForFlow to shield
Electric current I2For
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| JP2001183188A (en) * | 1999-12-24 | 2001-07-06 | Yokogawa Denshikiki Co Ltd | Monitoring apparatus for carried-out amount of rock |
| US8867026B2 (en) * | 2011-08-16 | 2014-10-21 | The Johns Hopkins University | Chip-scale optomechanical gravimeter |
| CN102494801B (en) * | 2011-12-07 | 2013-05-29 | 电子科技大学 | Distributed optical delay optical fiber temperature sensor |
| CN203605976U (en) * | 2013-12-06 | 2014-05-21 | 山东大学 | Distributed type optical fiber temperature and stress sensing device |
| CN104932023B (en) * | 2015-06-23 | 2017-06-20 | 华中科技大学 | A kind of tunnel forward probe device and its detection method based on fibre optic current sensor |
| CN106226822B (en) * | 2016-09-28 | 2018-04-10 | 华中科技大学 | A kind of geology forward probe method based on two-way current balance type and rock tunnel(ling) machine |
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