CN112230289B - Transient electromagnetic anti-interference detection method and system under TBM tunnel environment - Google Patents
Transient electromagnetic anti-interference detection method and system under TBM tunnel environment Download PDFInfo
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Abstract
The invention belongs to the field of underground engineering, and provides a transient electromagnetic anti-interference detection method and a transient electromagnetic anti-interference detection system in a TBM tunnel environment. The transient electromagnetic anti-interference detection method under the TBM tunnel environment comprises the steps that two electric dipole sources which are parallel to each other are arranged on a tunnel face and connected with each other, so that the emission of a transient electromagnetic field is realized; a plurality of electric field observation points are uniformly distributed between the two electric dipole sources on the tunnel face; a receiving electrode is arranged at each electric field observation point and is connected with a transmitting electrode to form a receiving array; electrifying in two electric dipole sources which are parallel to each other; and collecting a secondary electric field component parallel to the direction of the radiation source on the electric field observation point, and using the secondary electric field component to explain relevant physical parameters of the geologic body near the tunnel. The multi-electric radiation source and the array receiving electrodes are arranged on the tunneling surface, so that the detection depth and the signal-to-noise ratio can be improved, and the resolution of poor geologic bodies can be improved.
Description
Technical Field
The invention belongs to the field of underground engineering, and particularly relates to a transient electromagnetic anti-interference detection method and system in a TBM tunnel environment.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
TBM is short for English Tunnel Boring Machine, and is a novel and advanced Tunnel construction Machine which utilizes a rotary cutter to excavate, simultaneously break and Tunnel surrounding rocks in a Tunnel and form the whole Tunnel section. Is becoming the main method for designing and constructing the long and large tunnel in China. However, in the tunnel constructed by adopting the TBM, the conventional transient electromagnetic device is limited due to the existence of large-scale metal equipment, the metal members of the TBM generate strong electromagnetic interference on the acquisition of the secondary field attenuation voltage, the electromagnetic environment in the tunnel is complex, and the interference on the conventional transient electromagnetic detection method is serious. The TBM machine is used as a good conductor, after a field is turned off, the electromagnetic induction can generate larger induced electromotive force, the TBM machine is large in size and small in distance from a tunnel face, and the generated induced electromotive force is far stronger than the response generated by an abnormal body in front of the tunnel face, so that the existence of the TBM machine can bring huge interference to the vertical induced electromotive force of the TBM machine, the low-resistance false abnormal phenomenon is caused, the detection capability of a transient electromagnetic method is directly influenced, and the application of the traditional transient electromagnetic method in a TBM construction tunnel is difficult to predict in advance. Meanwhile, the space in the tunnel is narrow and complex, the TBM occupies most of the tunnel space on the tunnel face and behind the tunnel face, the drilling and geophysical prospecting method is difficult to directly develop on the tunnel face, and the arrangement of observation systems for a plurality of geophysical prospecting operations in the tunnel is restricted, so that the research and selection of the device form of the geophysical prospecting method in the tunnel need to overcome the limitation of the TBM on the forecasting operation space.
The inventor finds that in a time domain and a frequency domain, the electromagnetic response of a TBM body is strong, and some traditional denoising methods are poor in effect. At the present stage, the TBM interference elimination based on the numerical simulation method achieves a good effect on a theoretical model, but in the practical application process, the accurate modeling of the electromagnetic response of the TBM in the numerical simulation method is difficult to achieve, and the detection result error is easy to cause. When the tunnel is constructed, the TBM machine can cut rocks and can also play a role in supporting soft rock masses in the tunnel, so that the smaller the tool withdrawal distance of the TBM machine is, the better the tool withdrawal distance is, but if the TBM is too close to the tunnel face, the interference received by the conventional transient electromagnetic method can be multiplied.
Disclosure of Invention
In order to solve the problems, the invention provides a transient electromagnetic anti-interference detection method and a transient electromagnetic anti-interference detection system in a TBM tunnel environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a transient electromagnetic anti-interference detection method in a TBM tunnel environment, which comprises the following steps:
two electric dipole sources which are parallel to each other are arranged on the tunnel face and connected with each other to realize the emission of the transient electromagnetic field;
a plurality of electric field observation points are uniformly distributed between the two electric dipole sources on the tunnel face;
a receiving electrode is arranged at each electric field observation point and is connected with a transmitting electrode to form a receiving array;
electrifying in two electric dipole sources which are parallel to each other;
and collecting a secondary electric field component parallel to the direction of the radiation source on the electric field observation point, and using the secondary electric field component to explain relevant physical parameters of the geologic body near the tunnel.
A second aspect of the present invention provides a transient electromagnetic anti-interference detection system in a TBM tunnel environment, including:
the two electric dipole sources are arranged on the tunnel face in parallel and connected to realize the emission of the transient electromagnetic field;
electric field observation points which are uniformly distributed between the two electric dipole sources;
the receiving electrodes are arranged at each electric field observation point and connected with the transmitting electrodes to form a receiving array;
and the signal processor is used for receiving the secondary electric field component parallel to the radiation source direction on each electric field observation point after the two electric dipole sources parallel to each other are electrified so as to explain the related physical parameters of the geologic body near the tunnel.
The invention has the beneficial effects that:
the invention enhances the emission signal by a plurality of radiation sources and adopts the array receiving method, thereby having large data acquisition quantity, being beneficial to the subsequent high-resolution revealing research and simultaneously being beneficial to effectively reducing the interference of the TBM machine on the detection of the transient electromagnetic method.
According to the invention, the multiple electric radiation sources and the array type receiving electrodes are arranged on the tunneling surface, so that the detection depth and the signal-to-noise ratio can be improved, and the resolution of the poor geologic body is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of a transient electromagnetic anti-interference detection method in a TBM tunnel environment according to an embodiment of the present invention;
FIG. 2 is a schematic view of a radiation source layout according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the layout of the electric field observation point receiving electrodes according to the embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the art, and should not be construed as limiting the present invention.
The transient electromagnetic anti-interference detection method in the TBM tunnel environment utilizes a multi-radiation electric source for emission, and the influence of detection by the TBM transient electromagnetic method can be reduced to the maximum extent by the aid of a secondary electric field array receiving device.
Referring to fig. 1, the transient electromagnetic anti-interference detection method in the TBM tunnel environment of the present embodiment includes:
step 1: two electric dipole sources which are parallel to each other are arranged on the tunnel face and connected to each other to realize the emission of the transient electromagnetic field, as shown in figure 2.
In a specific implementation, two mutually parallel electric dipole sources are connected by a conducting wire.
When the electric dipole source is arranged on the tunnel face, two electric dipole sources which are parallel to each other are arranged and tightly attached to the tunnel face, and the power supply directions of the two parallel electric dipole sources are ensured to be the same so as to ensure that the secondary field received by the electric dipole sources has a reinforcing effect; and the other two parallel electric dipole sources are vertically arranged on the tunnel face so as to avoid the contact of the upper electric dipole source and a cutter head of the TBM machine, which causes inaccurate detection.
The electric dipole source is an electric dipole radiation source.
Step 2: and a plurality of electric field observation points are uniformly distributed between the two electric dipole sources on the tunnel face.
For example: between the electric dipole radiation sources, 16 electric field observation points are uniformly and equidistantly arranged on the tunnel face, as shown in figure 3.
It should be noted here that in other embodiments, other numbers of electric field observation points may be uniformly distributed between two electric dipole sources.
And step 3: and a receiving electrode is arranged at each electric field observation point and is connected with the transmitting electrode to form a receiving array.
In specific implementation, a receiving electrode is arranged at each electric field observation point, and an array receiving mode is realized. The electrode is a grounding electrode; each observation point is positioned at the midpoint of the receiving electrode, and the connecting line of the observation point and the electrode is parallel to the electric dipole source so as to ensure that the secondary electric field component parallel to the radiation source direction can be acquired.
And 4, step 4: two electric dipole sources parallel to each other are energized.
And 5: and collecting a secondary electric field component parallel to the direction of the radiation source on the electric field observation point, and using the secondary electric field component to explain relevant physical parameters of the geologic body near the tunnel.
In a tunnel construction environment of the TBM, in a radiation field excited by an electrical source and a secondary field component, the amplitude of the electric field component is stronger than that of the magnetic field component, and the spatial distribution rule of the electric field component is more favorable for advanced detection, so that an electric field component acquisition-based device form is adopted to acquire the x-direction component of the secondary electric field parallel to the radiation source direction during receiving.
Meanwhile, a gap exists between the TBM cutter head and the tunneling surface, so that radiation of an electric field to the rear of the tunneling surface is blocked, normal components of the electric field on interfaces of different media are not continuous, power lines of a radiation field hardly pass through the TBM, the TBM cannot generate a secondary abnormal electric field, and the x-direction component of the secondary electric field obtained under the excitation of an electric radiation source is hardly influenced by the TBM.
Therefore, compared with a device based on a magnetic field component, the device based on electric field component acquisition has a better shielding effect on the interference of the TBM machine, and is more suitable for the tunnel constructed by the TBM.
In one or more embodiments, a transient electromagnetic interference rejection detection system in a TBM tunnel environment includes:
(1) the two electric dipole sources are arranged on the tunnel face in parallel and connected to realize the emission of the transient electromagnetic field.
When the electric dipole source is arranged on the tunneling surface, the electric dipole source is ensured to be tightly attached to the tunneling surface and is not connected with a TBM (tunnel boring machine) behind the tunneling surface. The action rule of the electric dipole source on the secondary field is the current directions of the two groups of electric dipole sources, if the current directions of the two groups of electric dipole sources are the same, the electric dipole source has a strengthening effect on the received secondary field, otherwise, the electric dipole sources are mutually counteracted. Therefore, the two electric dipole sources are parallel to each other and have the same direction, and are respectively positioned on two sides of the tunnel face of the tunnel. Meanwhile, if the two electric dipole sources are horizontally arranged on the tunnel face of the tunnel, the radiation effect is the same as that of horizontal arrangement, but when the TBM is stopped, the upper part of the cutterhead may be connected with the tunneling face, so that the electric dipole source above the cutterhead contacts with the TBM cutterhead to influence the detection precision, and the radiation source is vertically arranged.
(2) And the electric field observation points are uniformly distributed between the two electric dipole sources.
For example: and 16 electric field observation points are uniformly and equidistantly distributed on the tunnel face among the electric dipole radiation sources.
It should be noted here that in other embodiments, other numbers of electric field observation points may be uniformly distributed between two electric dipole sources.
(3) And the receiving electrodes are arranged at each electric field observation point and connected with the transmitting electrodes to form a receiving array.
In specific implementation, a receiving electrode is arranged at each electric field observation point, and an array receiving mode is realized. The electrode is a grounding electrode; each observation point is positioned at the midpoint of the receiving electrode, and the connecting line of the observation point and the electrode is parallel to the electric dipole source so as to ensure that the secondary electric field component parallel to the radiation source direction can be acquired.
(4) And the signal processor is used for receiving the secondary electric field component parallel to the radiation source direction on each electric field observation point after the two electric dipole sources parallel to each other are electrified so as to explain the related physical parameters of the geologic body near the tunnel.
In the embodiment, the emission signals are enhanced by multiple radiation sources, and the array receiving method is adopted, so that the data acquisition quantity is large, the subsequent high-resolution revealing research is facilitated, and the interference of the TBM to the detection of the transient electromagnetic method is effectively reduced.
In the embodiment, the multi-electric radiation source and the array type receiving electrodes are arranged on the tunneling surface, so that the detection depth and the signal to noise ratio can be improved, and the resolution of the poor geologic body is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A transient electromagnetic anti-interference detection method under a TBM tunnel environment is characterized by comprising the following steps:
two electric dipole sources which are parallel to each other are arranged on the tunnel face and connected with each other to realize the emission of the transient electromagnetic field;
a plurality of electric field observation points are uniformly distributed between two electric dipole sources on the tunnel face;
a receiving electrode is arranged at each electric field observation point and is connected with a transmitting electrode to form a receiving array;
electrifying in two electric dipole sources which are parallel to each other;
collecting secondary electric field components parallel to the direction of the radiation source on an electric field observation point, and interpreting related physical parameters of a geologic body near the tunnel;
the electric field observation points are uniformly arranged at equal intervals between the two electric dipole sources.
2. The transient electromagnetic anti-interference detection method in the TBM tunnel environment as recited in claim 1, wherein two electric dipole sources parallel to each other are tightly attached to the tunnel face, and the power supply directions are the same.
3. The method of claim 1, wherein two parallel electric dipole sources are vertically disposed on the tunnel face.
4. The transient electromagnetic anti-interference detection method in the TBM tunnel environment of claim 1, wherein each electric field observation point is at the midpoint of a receiving electrode, and the electric field observation point and the electrode connecting line are parallel to an electric dipole source to ensure that a secondary electric field component parallel to the radiation source direction is collected.
5. The method for transient electromagnetic anti-interference detection in a TBM tunnel environment according to claim 1, wherein a horizontal direction component of the secondary electric field parallel to the radiation source direction is collected based on an electric field component collection device form.
6. The utility model provides a transient electromagnetism anti-interference detection system under TBM tunnel environment which characterized in that includes:
the two electric dipole sources are arranged on the tunnel face in parallel and connected to realize the emission of the transient electromagnetic field;
electric field observation points which are uniformly distributed between the two electric dipole sources;
the receiving electrodes are arranged at each electric field observation point and connected with the transmitting electrodes to form a receiving array;
the signal processor is used for receiving a secondary electric field component parallel to the radiation source direction on each electric field observation point after two electric dipole sources which are parallel to each other are electrified so as to explain relevant physical parameters of a geologic body near the tunnel;
the electric field observation points are uniformly arranged at equal intervals between the two electric dipole sources.
7. The transient electromagnetic anti-interference detection system in the TBM tunnel environment of claim 6, wherein two parallel electric dipole sources are tightly attached to the tunnel face and have the same power supply direction.
8. The transient electromagnetic interference resistant detection system in a TBM tunnel environment of claim 6, wherein two mutually parallel electric dipole sources are vertically placed on the tunnel face.
9. The system of claim 6, wherein each electric field observation point is located at a midpoint of a receiving electrode, and a connecting line of the electric field observation point and the electrode is parallel to the electric dipole source, so as to ensure that a secondary electric field component parallel to a radiation source direction is collected.
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