CN104932023B - A kind of tunnel forward probe device and its detection method based on fibre optic current sensor - Google Patents
A kind of tunnel forward probe device and its detection method based on fibre optic current sensor Download PDFInfo
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- CN104932023B CN104932023B CN201510349349.0A CN201510349349A CN104932023B CN 104932023 B CN104932023 B CN 104932023B CN 201510349349 A CN201510349349 A CN 201510349349A CN 104932023 B CN104932023 B CN 104932023B
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- fibre optic
- current sensor
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- optical fiber
- optic current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention discloses a kind of tunnel forward probe device and detection method based on fibre optic current sensor, the system is made up of constant-current source, voltmeter, LASER Light Source, fibre optic current sensor and anchor pole.In complete-section tunnel boring machine (Tunnel Boring Machine, TBM driving part) passes to constant electric current I, enclosed using Optical Fiber Winding one at the rear of the rear of cutterhead and shield respectively, can know the size of current on cutterhead, shield, TBM rears Support Equipment using fibre optic current sensor, the apparent resistance of the voltage calculating geologic body on shield is further measured to judge the water content and rock category of geologic body.Compared with conventional tunnel electric current forward probe method, substantial amounts of pre insulated work is eliminated.
Description
Technical field
The invention belongs to visit applied technical field before Tunnel Engineering geology, fibre-optic current is based on more particularly, to one kind
The tunnel forward probe device and its detection method of sensor.
Background technology
2002, German GEO S.R.L. developed the tunnel forward probe system (Bore- based on focus current method
Tunneling Electrical Ahead Monitoring, BEAM), its operation principle is to front of tunnel heading using cutterhead
Apply probe current, the geological structure in front is analyzed by way of the apparent resistance for measuring geologic body, while in order to improve spy
Precision and directionality are surveyed, same phase is passed on the shield of complete-section tunnel boring machine (Tunnel Boring Machine, TBM)
Bucking current, " extruding " probe current the characteristics of repelled each other using the same sex makes it more be concentrated to front of tunnel heading.But the party
Method needs to be insulated the cutterhead and shield of TBM before application, due to shield and cutterhead bulky, complex structure, and bears
Huge active force, carries out that insulation is extremely difficult, and geological condition is complicated and changeable in tunneling process, and insulation has at any time can
Can failure.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of tunnel forward probe based on fibre optic current sensor
Device and corresponding detection method, the device can be realized over the ground in the case where not insulated to the cutterhead and shield of TBM
The measurement of plastid apparent resistance.
The invention provides a kind of tunnel forward probe device based on fibre optic current sensor, including optical fiber, voltmeter,
LASER Light Source, fibre optic current sensor, constant-current source and anchor pole, wherein：
The optical fiber detours a circle or multi-turn between shield and cutterhead, and one end of optical fiber is connected with LASER Light Source, another
End be connected with fibre optic current sensor, the positive pole of voltmeter and constant-current source is connected with shield, the negative pole of voltmeter and constant-current source and
The anchor pole injected in rock stratum positioned at distal end is connected.
It is another aspect of this invention to provide that additionally providing a kind of advanced based on the above-mentioned tunnel based on fibre optic current sensor
The detection method of detection device, including：
Linearly polarized light being sent using LASER Light Source, fibre optic current sensor is entered into by the optical fiber between shield and cutterhead
In, the size of deflection angle is measured by fibre optic current sensor, calculate electric current I1Size；
Using the voltage U on voltmeter measurement shield；
Using this electric current I1With the apparent resistance R that voltage U calculates front of tunnel heading1=U/I1。
Further, optical fiber, one end of the optical fiber and institute are wound a ring or multiple ring in the periphery of TBM rears protection equipment
State LASER Light Source to be connected, the other end is connected with the fibre optic current sensor.
It is another aspect of this invention to provide that additionally providing a kind of advanced based on the above-mentioned tunnel based on fibre optic current sensor
The detection method of detection device, including：
Linearly polarized light being sent using LASER Light Source, fibre optic current sensor is entered into by the optical fiber between shield and cutterhead
In, the size of deflection angle is measured by fibre optic current sensor, calculate electric current I1Size；
Linearly polarized light being sent using LASER Light Source, fibre-optic current biography is entered into by the optical fiber of TBM rears protection equipment periphery
In sensor, the size of deflection angle is measured by fibre optic current sensor, calculate electric current I2Size；
Using the voltage U on voltmeter measurement shield；
Calculate the electric current I that geologic body is flowed on shield3, I3=I0-I1-I2, wherein I0It is the constant electricity provided in constant-current source
Stream；
Calculate the apparent resistance R of geologic body around shield3=U/I3。
This method has the characteristics that：
1. worked completely without the pre insulated between shield and cutterhead, in BEAM synthesis, probe current and protection are electric
Stream is artificially to realize separating by insulated working, and this method simply applies an electric current, you can with by optical fiber electricity
Flow sensor measures probe current I1With protective current I2Concrete numerical value, and need not be insulated.
2. in traditional focus current method, cutterhead voltage and shield voltage need to measure respectively, between cutterhead is in not
In disconnected rotation, continuously measuring its magnitude of voltage has certain difficulty, and in the method, the cutterhead voltage in the case of naked is equal to
Shield voltage, therefore only measurement shield voltage just can reach analysis requirement, bypass the problem that cutterhead voltage is uninterruptedly measured.
3. fibre optic current sensor is used for TBM equipment, realizes and the section electric current of major diameter labyrinth machinery is surveyed
Amount, is innovation of the invention, and the measurement means are a kind of non-contact measurements, it is not necessary to which original equipment is changed
It is dynamic.
Brief description of the drawings
Fig. 1 is the amperometry of the tunnel forward probe specific implementation based on fibre optic current sensor in the present invention；
Fig. 2 is a kind of tunnel forward probe schematic device based on fibre optic current sensor in the embodiment of the present invention；
Fig. 3 is another tunnel forward probe schematic device based on fibre optic current sensor in the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
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 additionally, technical characteristic involved in invention described below each implementation method
Not constituting conflict each other can just be mutually combined.
Principle first to apparatus of the present invention is illustrated, tunnel forward probe of the present invention based on fibre optic current sensor
Device includes constant-current source, voltmeter, LASER Light Source, fibre optic current sensor and anchor pole composition.Wherein, shield of the constant-current source to TBM
Clypeus point passes to electric current I0, optical fiber detours a circle or multi-turn between cutterhead and shield, shield and rear guarantee equipment respectively, and
With the magnitude of voltage on voltmeter measurement shield, the negative pole of constant-current source and voltmeter is connected on the anchor pole outside hundreds of meters.
Fibre optic current sensor is the equipment of independent research, and its theoretical foundation is magnetic rotation effect, inclined by measuring line
Shake deflection angle of the light in magnetic field, the magnetic induction intensity on TBM surfaces can be calculated, according to Ampère circuital theorem, can calculate
The optical fiber of fibre optic current sensor to detour and flow through electric current inside ring.
The inventive method does not need pre insulated work, in practical engineering application, passes to size with constant-current source as shown in Figure 1
It is I0Constant current, the electric current can be divided into three parts and flow to cutterhead, shield and TBM rears respectively and ensure equipment.By optical fiber electricity
The optical fiber of flow sensor detours a circle or multi-turn between cutterhead and shield, you can measure the electric current number that cutterhead is flowed to by shield
Value I1.The optical fiber of another fibre optic current sensor is detoured a circle or multi-turn between shield and TBM rears guarantee equipment, i.e.,
It is measurable to go out to flow to the current values I that TBM rears ensure equipment by shield2.According to Kirchhoff's current law (KCL), flowed on shield
The electric current I of geologic body3Can be by calculating, I3=I0-I1-I2。
In order to illustrate its principle, the method is simplified using Fig. 2, the coupling part only between shield and cutterhead around
Row one encloses optical fiber, the electric current I that this fibre optic current sensor is measured1It is probe current.Voltage U on measurement shield, due to shield
Without insulation between shield and cutterhead, therefore cutterhead voltage is equal to shield voltage, and the voltage receives geologic body apparent resistance and detection
The combined influence of size of current.Calculate the apparent resistance R of geologic body1=U/I1, you can the geological state in front is determined, it is general next
Say, R1If increase, front has and larger is likely to occur solid rock, R1If reduced, front geological body rich water rate is high.
As shown in Fig. 2 the invention provides a kind of tunnel forward probe device based on fibre optic current sensor, the dress
Put including optical fiber, voltmeter, LASER Light Source, fibre optic current sensor, constant-current source and anchor pole, wherein：
Detoured a circle using optical fiber between shield and cutterhead, and one end of optical fiber is connected with LASER Light Source, the other end and light
Fiber current sensor be connected, the positive pole of voltmeter and constant-current source is connected with shield, the negative pole of voltmeter and constant-current source with positioned at far
The anchor pole injected in rock stratum at end is connected (for example, the anchor pole is located at outside hundreds of meters).
Due to no insulation between cutterhead and shield, therefore an electric current part for constant-current source can flow to cutterhead, this part electricity
Stream must completely extend across the ring that optical fiber is coiled into.The linearly polarized light that LASER Light Source is sent enters into fiber-optic current sensor by optical fiber
In device, under the influence of this portion of electrical current, the deflection angle of linearly polarized light can change, and be measured by fibre optic current sensor
The size of deflection angle, i.e., can calculate the size of electric current.Voltmeter is used to measure the voltage on shield.Using this electric current and
Voltage can calculate the apparent resistivity of front of tunnel heading, distance and attribute for judging anomalous body.
Further, as shown in figure 3, optical fiber, one end of the optical fiber are enclosed in the periphery winding one in TBM rears protection equipment
It is connected with the LASER Light Source, the other end is connected with the fibre optic current sensor.
After the electric current for flowing to each several part is measured, shield voltage U is measured, you can draw the apparent resistivity R of front of tunnel heading1
=U/I1And around shield geologic body apparent resistance R3=U/I3, use R1Judge the distance and attribute of front of tunnel heading anomalous body, use
R3Judge the distribution situation of anomalous body around shield.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include
Within protection scope of the present invention.
Claims (4)
1. a kind of tunnel forward probe device based on fibre optic current sensor, it is characterised in that described device includes optical fiber, electricity
Pressure table, LASER Light Source, fibre optic current sensor, constant-current source and anchor pole, wherein：
The optical fiber detours a circle or multi-turn between shield and cutterhead, and one end of optical fiber is connected with LASER Light Source, the other end with
Fibre optic current sensor be connected, the positive pole of voltmeter and constant-current source is connected with shield, the negative pole of voltmeter and constant-current source be located at
The anchor pole injected in rock stratum of distal end is connected.
2. device as claimed in claim 1, it is characterised in that the periphery of protection equipment winds a ring or multiple ring at TBM rears
Optical fiber, one end of the optical fiber is connected with the LASER Light Source, and the other end is connected with the fibre optic current sensor.
3. the detection method of the tunnel forward probe device based on fibre optic current sensor being based on described in claim 1 or 2, its
It is characterised by, including：
Linearly polarized light is sent using LASER Light Source to be entered into fibre optic current sensor by the optical fiber between shield and cutterhead, lead to
The size that fibre optic current sensor measures deflection angle is crossed, electric current I is measured1Size；
Using the voltage U on voltmeter measurement shield；
Using this electric current I1With the apparent resistivity R that voltage U calculates front of tunnel heading1=U/I1。
4. the detection method of the tunnel forward probe device based on fibre optic current sensor being based on described in claim 2, it is special
Levy and be, including：
Linearly polarized light is sent using LASER Light Source to be entered into fibre optic current sensor by the optical fiber between shield and cutterhead, lead to
The size that fibre optic current sensor measures deflection angle is crossed, electric current I is measured1Size；
Linearly polarized light being sent using LASER Light Source, fibre optic current sensor is entered into by the optical fiber of TBM rears protection equipment periphery
In, the size of deflection angle is measured by fibre optic current sensor, measure electric current I2Size；
Using the voltage U on voltmeter measurement shield；
Calculate the electric current I that geologic body is flowed on shield3, I3=I0-I1-I2, wherein I0It is the constant current provided in constant-current source；
Calculate the apparent resistance R of geologic body around shield3=U/I3。
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| CN201510349349.0A CN104932023B (en) | 2015-06-23 | 2015-06-23 | A kind of tunnel forward probe device and its detection method based on fibre optic current sensor |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106526681B (en) * | 2016-09-28 | 2018-06-12 | 华中科技大学 | Geology forward probe method based on interleaved power and complete-section tunnel boring machine |
| CN108710152B (en) * | 2018-05-08 | 2019-08-13 | 华中科技大学 | Tunnel forward probe system and detection method based on binary channels amplitude-modulated wave |
| 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 |
| CN111024769B (en) * | 2019-12-17 | 2020-11-24 | 中国矿业大学 | Coal mine advanced detection method for heading machine |
| CN111044771B (en) * | 2019-12-31 | 2021-01-05 | 华中科技大学 | Non-closed optical fiber loop current sensing device and current measuring method |
| CN113740920B (en) * | 2021-07-15 | 2023-04-21 | 中国矿业大学 | Advanced detection device and advanced detection method for mining |
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|---|---|---|---|---|
| JP2002106291A (en) * | 2000-10-04 | 2002-04-10 | Taisei Corp | Working face-forward geological prediction method using electromagnetic wave |
| CN103076635A (en) * | 2013-01-07 | 2013-05-01 | 山东大学 | Advanced detection system and method for TBM (Tunnel Boring Machine) tunnel construction based on forward three-dimensional induced polarization |
-
2015
- 2015-06-23 CN CN201510349349.0A patent/CN104932023B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002106291A (en) * | 2000-10-04 | 2002-04-10 | Taisei Corp | Working face-forward geological prediction method using electromagnetic wave |
| CN103076635A (en) * | 2013-01-07 | 2013-05-01 | 山东大学 | Advanced detection system and method for TBM (Tunnel Boring Machine) tunnel construction based on forward three-dimensional induced polarization |
Non-Patent Citations (2)
| Title |
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| BEAM法地质预报系统在中国TBM施工中的应用;杨卫国 等;《辽宁工程技术大学学报》;20061130;第25卷;第161-162页 * |
| 隧道TBM施工中BEAM地质超前预报系统应用;赵博;《轨道交通》;20141231;第104-107页 * |
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