CN105044790A - System and method for determining orientation of anomalous body on the basis of circumferential electrode scanning - Google Patents
System and method for determining orientation of anomalous body on the basis of circumferential electrode scanning Download PDFInfo
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- CN105044790A CN105044790A CN201510348935.3A CN201510348935A CN105044790A CN 105044790 A CN105044790 A CN 105044790A CN 201510348935 A CN201510348935 A CN 201510348935A CN 105044790 A CN105044790 A CN 105044790A
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Abstract
The invention discloses a system and method for determining the orientation of an anomalous body on the basis of circumferential electrode scanning and belongs to the technical field of tunneling geological ahead monitoring. The system comprises multiple circumferential electrodes, a constant-current driving circuit, a voltage measuring circuit, an extended cable, and an anchor pole. The multiple circumferential electrodes are uniformly distributed on a tunnel wall a certain distance behind the shield of a tunnel boring machine. The constant-current driving circuit successively supplies constant current to the circumferential electrodes. The voltage measuring circuit acquires corresponding shield voltage. The orientation of the anomalous body can be accurately determined by the analysis of the voltage on the shield. The system is simple in structure and easy to be manually operated.
Description
Technical field
Visit technical field before the invention belongs to Tunnel Engineering geology, more specifically, relate to a kind of anomalous body orientation based on circumferential electrode scanning and judge system and method.
Background technology
2002, Geo company of Germany develops tunnel forward probe system BEAM (Bore-TunnelingElectricalAheadMonitoring) based on focusing current method, its principle of work utilizes cutterhead to apply probe current to front of tunnel heading, and the mode measuring the apparent resistivity of geologic body analyzes the tectonic structure in front.In China, start late, and carry out analogue simulation more to the research of BEAM, until 2008, someone utilizes same focusing current method to carry out tunnel forward probe, is aided with induced polarization analysis, could determine the size of anomalous body and the approximate distance in front.But because of focusing current ratio juris defect, in its measuring process, there is no the concept in " orientation ", broadly tunnel front geological is regarded as an entirety and analyze, even if so find the existence of geological anomalous body, its concrete orientation also cannot be judged.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of anomalous body orientation based on circumferential electrode scanning and judge system and method, by to being distributed in complete-section tunnel boring machine (TunnelBoringMachine, TBM) circumferential electrode at shield rear applies constant current excitation, measure the voltage on TBM shield, the orientation of anomalous body can be judged.
For achieving the above object, according to one aspect of the present invention, provide a kind of anomalous body orientation based on circumferential electrode scanning to judge system, comprise multiple circumferential electrode, constant-current drive circuit, tension measuring circuit, prolongation cable and anchor pole, wherein:
Described multiple circumferential electrode is evenly arranged in the tunnel wall at TBM shield rear in the mode of dividing equally circumference; The positive pole of described constant-current drive circuit is connected with described multiple circumferential electrode, in the mode of multiple-way supply successively to each circumferential electrode loading current; The positive pole of described tension measuring circuit is connected with described TBM shield, measures corresponding TBM shield voltage; Described anchor pole is squeezed in soil layer, is connected negative pole one end of described constant-current drive circuit and described tension measuring circuit by described prolongation cable.
According to another aspect of the present invention, a kind of anomalous body orientation determination methods based on circumferential electrode scanning is provided, comprises:
Anchor pole is squeezed in soil layer, negative pole one end of constant-current drive circuit and tension measuring circuit is connected by extending cable, after there is anomalous body in front to be determined, with the distribution mode of dividing equally circumference, multiple circumferential electrode is squeezed in the tunnel wall at TBM shield rear, described constant-current drive circuit in the mode of multiple-way supply successively to each circumferential electrode loading current, described tension measuring circuit measures corresponding TBM shield voltage, and judges the orientation of described anomalous body according to described TBM shield voltage.
In general, the above technical scheme conceived by the present invention compared with prior art, has following beneficial effect:
1. the present invention compensate for the deficiency that BEAM system judges for anomalous body orientation, can measure its orientation accurately after detecting anomalous body;
2. structure of the present invention is simple, and simple installation, does not require the experience educational background of operating personnel.
Accompanying drawing explanation
Fig. 1 is that the anomalous body orientation that the present invention is based on circumferential electrode scanning judges the structural representation of system.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Figure 1 shows that the anomalous body orientation that the present invention is based on circumferential electrode scanning judges the structural representation of system, comprise multiple circumferential electrode, constant-current drive circuit, tension measuring circuit, prolongation cable and anchor pole.
In the utilization process of real system, constant-current drive circuit should export steadily, and internal resistance is adjustable.Tension measuring circuit should select range at the accurate voltage table of 0 ~ 5V.Eight or more circumferential electrodes are evenly arranged in the tunnel wall of TBM shield rear in the mode of dividing equally circumference.Each circumferential electrode answers specification consistent, avoids shape difference to cause result distortion.Circumferential electrode and anchor surface rust cleaning, to reduce contact resistance, improve measurement sensistivity.
In embodiments of the present invention, anchor pole is squeezed in the soil layer outside hundreds of rice, negative pole one end of constant-current drive circuit and tension measuring circuit is connected by extending cable, after treating to determine that there is high-impedance state (low resistance state) anomalous body in front with focusing current method or other means, multiple circumferential electrode is squeezed in the tunnel wall at shield rear, distribute in the mode of dividing equally circumference, each circumferential electrode is drawn electric wire and is connected with a polycore cable, and the other end of this polycore cable connects the positive pole of constant-current drive circuit.Tension measuring circuit positive pole is connected with TBM shield.Constant-current drive circuit is in the mode of multiple-way supply successively to each circumferential electrode loading current, and corresponding shield voltage measured by the accurate voltage table in tension measuring circuit.Analyze the shield voltage recorded after all completing, if anomalous body to be positioned is high-impedance state (low resistance state) anomalous body, then namely the circumferential electrode orientation corresponding to shield voltage maximum (little) value is the orientation of anomalous body.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the anomalous body orientation based on circumferential electrode scanning judges a system, it is characterized in that, comprises multiple circumferential electrode, constant-current drive circuit, tension measuring circuit, prolongation cable and anchor pole, wherein:
Described multiple circumferential electrode is evenly arranged in the tunnel wall at TBM shield rear in the mode of dividing equally circumference; The positive pole of described constant-current drive circuit is connected with described multiple circumferential electrode, in the mode of multiple-way supply successively to each circumferential electrode loading current; The positive pole of described tension measuring circuit is connected with described TBM shield, measures corresponding TBM shield voltage; Described anchor pole is squeezed in soil layer, is connected negative pole one end of described constant-current drive circuit and described tension measuring circuit by described prolongation cable.
2. judge system based on the anomalous body orientation of circumferential electrode scanning as claimed in claim 1, it is characterized in that, each circumferential electrode is drawn electric wire and is connected with a polycore cable, and the other end of described polycore cable connects the positive pole of described constant-current drive circuit.
3. the anomalous body orientation determination methods based on circumferential electrode scanning, it is characterized in that, comprise: anchor pole is squeezed in soil layer, negative pole one end of constant-current drive circuit and tension measuring circuit is connected by extending cable, after there is anomalous body in front to be determined, with the distribution mode of dividing equally circumference, multiple circumferential electrode is squeezed in the tunnel wall at TBM shield rear, described constant-current drive circuit in the mode of multiple-way supply successively to each circumferential electrode loading current, described tension measuring circuit measures corresponding TBM shield voltage, and the orientation of described anomalous body is judged according to described TBM shield voltage.
4. method as claimed in claim 3, it is characterized in that, the positive pole of described constant-current drive circuit is connected with described multiple circumferential electrode, and the positive pole of described tension measuring circuit is connected with described TBM shield.
5. the method as described in claim 3 or 4, is characterized in that, if described anomalous body is high-impedance state anomalous body, then namely the circumferential electrode orientation corresponding to described TBM shield voltage max is the orientation of anomalous body; If described anomalous body is low resistance state anomalous body, then namely the circumferential electrode orientation corresponding to the little value of described TBM shield voltage is the orientation of anomalous body.
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| CN201510348935.3A CN105044790B (en) | 2015-06-23 | 2015-06-23 | A kind of anomalous body orientation scanned based on circumferential electrode judges system and method |
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| CN201510348935.3A CN105044790B (en) | 2015-06-23 | 2015-06-23 | A kind of anomalous body orientation scanned based on circumferential electrode judges system and method |
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Cited By (5)
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| CN106526681A (en) * | 2016-09-28 | 2017-03-22 | 华中科技大学 | Geologic advanced detection method based on alternative power supply and full-section tunneling machine |
| CN108957563A (en) * | 2018-09-08 | 2018-12-07 | 林光琴 | A kind of advanced geology for tunnel construction detection system and detection method |
| CN110989000A (en) * | 2019-12-20 | 2020-04-10 | 山东大学 | Multi-electrode focusing TBM advanced detection system and method based on anchor rod drilling |
| CN111123372A (en) * | 2019-12-24 | 2020-05-08 | 中国矿业大学(北京) | Coal mine floor drilling induced polarization method water inrush monitoring and forecasting system and method |
| CN113703063A (en) * | 2021-09-07 | 2021-11-26 | 中煤科工集团西安研究院有限公司 | Mine azimuth focusing direct current method advanced detection method |
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| CN110989000A (en) * | 2019-12-20 | 2020-04-10 | 山东大学 | Multi-electrode focusing TBM advanced detection system and method based on anchor rod drilling |
| CN111123372A (en) * | 2019-12-24 | 2020-05-08 | 中国矿业大学(北京) | Coal mine floor drilling induced polarization method water inrush monitoring and forecasting system and method |
| CN113703063A (en) * | 2021-09-07 | 2021-11-26 | 中煤科工集团西安研究院有限公司 | Mine azimuth focusing direct current method advanced detection method |
| CN113703063B (en) * | 2021-09-07 | 2023-08-11 | 中煤科工集团西安研究院有限公司 | Advanced detection method for mine azimuth focusing direct current method |
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