CN108710152A - Tunnel forward probe system based on binary channels amplitude-modulated wave and detection method - Google Patents
Tunnel forward probe system based on binary channels amplitude-modulated wave and detection method Download PDFInfo
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- CN108710152A CN108710152A CN201810432569.3A CN201810432569A CN108710152A CN 108710152 A CN108710152 A CN 108710152A CN 201810432569 A CN201810432569 A CN 201810432569A CN 108710152 A CN108710152 A CN 108710152A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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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.Signal generating module generates the amplitude-modulated wave of two-way different carrier frequencies, it is separately input to two constant current source modules, the output current of constant current source module is directly connected on shield all the way, and another way is connected on the output of first via constant-current source in the same point of shield after inversely passing through sensing fiber ring.Sensing fiber ring is wrapped in main drive shaft and holds, and the ground of constant current source module is connected 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 simultaneously after bandpass filtering, envelope detection, A/D samplings.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, using 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 technology
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 Project, 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
Crossing the electric current of sensing fiber ring can be measured, and measurement result indicates U=kI in the form of measuring voltage U, is 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 is increased by the calculated I errors of U and k
Greatly, the accurate judgement to geological state is influenced.
Invention content
For the disadvantages described above or Improvement requirement 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, including：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 will pass through sensing fiber ring to this two-way driving current signal, and produce 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 opto-electronic conversion,
Obtain including the detection electric signal of 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 samplings, wherein the two-way measurement voltage signal respectively
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 I1To flow to the electric current of cutterhead by base bearing, that reflects the geology of TBM front geological bodies letters
Breath, I2To flow to the electric current of 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；
By the two-way amplitude-modulated wave signal two-way amplitude-modulated wave signal electricity is proportional to by constant current source module generation
The two-way driving current signal of pressure, wherein first via driving current signal is connected on shield, and the second tunnel driving current signal is inverse
It is connected on shield to after sensing fiber ring；
Opto-electronic conversion will be passed through by the output signal of the sensing fiber ring, obtain the detection for including two carrier frequencies
Electric signal；
By the detection electric signal for including two carrier frequencies by bandpass filtering separation, then passes through envelope respectively and examine
Two-way measurement voltage signal is obtained after involving A/D samplings, wherein the first via measuring 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.
Preferably, it is I that the current amplitude of the two-way constant-current source output signal is equal0, it is connected on the same company of 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 I1To flow to the electric current of cutterhead by base bearing, that reflects the geology of TBM front geological bodies letters
Breath, I2To flow to the electric current of 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, the strong vibration of construction site can be inhibited to the interference of fibre optic current sensor, 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 is tied to measuring
The influence of fruit improves the reliability of system.
Description of the drawings
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 implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be 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
It does not constitute a conflict with each other and 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, the measurement scale system to eliminate fibre optic current sensor becomes at any time
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, including：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 will pass through sensing fiber ring to this two-way driving current signal, and generate wherein
The optical signal of different carrier frequencies；
Specifically, it is f to generate frequency modulating signal by signal generating module0, 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
Go out to be galvanically connected on shield；Carrier frequency is f2Amplitude-modulated wave signal is input in the second constant current source module, the second road constant-current source
The output current of module is connected to after inversely passing through sensing fiber ring on shield, 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 description of the drawings.
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, it is connected on the same tie point of shield.
Fibre optic current sensor obtains including two for the output optical signal of sensing fiber ring to be passed through opto-electronic conversion
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 detached by bandpass filtering, then
Two-way measurement voltage signal is obtained after envelope detection and A/D samplings, wherein first in two-way measurement voltage signal respectively
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, including it is f that the detection electric signal of two carrier frequencies, which passes through centre frequency,1Bandpass filtering, envelope detection
And A/D samplings, 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 bodies, I2To flow to the electric current of lithosome from shield, that reflects side geologic bodies
Geological information, k is proportionality coefficient.
In embodiments of the present invention, it can be flowed to by first via measurement voltage signal and the second tunnel measurement voltage signal
The electric current I of cutterhead1ForFlow to the electric current I of shield2For
Due to voltage value U1And U2It measures and obtains simultaneously, assume 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, including：
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 amplitude modulation wave voltage by two-way constant current source module in hardware realization
It number generates and to be proportional to the two-way driving current signal of the voltage signal.
Opto-electronic conversion will be passed through by the output optical signal of sensing fiber ring, obtain two-way detectable signal；
In embodiments of the present invention, it can will pass through sensing fiber ring by fibre optic current sensor in hardware realization
Output signal passes through opto-electronic conversion, obtains the detection electric signal for including two carrier frequencies.
By the detection electric signal comprising two carrier frequencies by bandpass filtering detach, then respectively pass through envelope detection and
Two-way measurement voltage signal is obtained after A/D samplings, 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, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., 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, which is characterized in that including：It is 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 will pass through sensing fiber ring to this two-way driving current signal, and generate 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 pass through opto-electronic conversion, obtain
Include the detection electric signal of 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 samplings, wherein in the two-way measurement voltage signal respectively
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 output letter of the two-way constant current source module
Number current amplitude it is equal be I0, it is connected 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 I1To flow to the electric current of cutterhead, reflection by base bearing
The geological informations of TBM front geological bodies, I2To flow to the electric current of 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, which is characterized in that including：
It is identical to generate frequency modulating signal, the different two-way amplitude-modulated wave signal of carrier frequency；
By the two-way amplitude-modulated wave signal two-way amplitude modulation wave voltage signal is proportional to by constant current source module generation
Two-way driving current signal, wherein first via driving current signal is connected on shield, and the second tunnel driving current signal is inversely worn
It is connected on shield after crossing sensing fiber ring；
Opto-electronic conversion will be passed through by the output signal of the sensing fiber ring, obtain the detection telecommunications for including two carrier frequencies
Number；
By it is described include two carrier frequencies detection electric signal by bandpass filtering detach, then respectively pass through envelope detection and
Two-way measurement voltage signal is obtained after A/D samplings, wherein the first via measuring signal reflection in the two-way measurement voltage signal
The size of cutterhead electric current, the second tunnel measurement voltage signal in the two-way measurement voltage signal reflect the big of shield electric current
It is small.
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, it is connected 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 I1To flow to the electric current of cutterhead, reflection by base bearing
The geological informations of TBM front geological bodies, I2To flow to the electric current of 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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Cited By (1)
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| CN108646300A (en) * | 2018-05-08 | 2018-10-12 | 华中科技大学 | Fibre-optic current shielding tunnel forward probe device based on amplitude-modulated wave and detection method |
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| CN108646300B (en) * | 2018-05-08 | 2019-04-12 | 华中科技大学 | Fibre-optic current shielding tunnel forward probe device and detection method based on amplitude-modulated wave |
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