CN215894977U - Scanning electrical method advanced geological prediction device carried on large-diameter slurry shield - Google Patents
Scanning electrical method advanced geological prediction device carried on large-diameter slurry shield Download PDFInfo
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- CN215894977U CN215894977U CN202122327616.8U CN202122327616U CN215894977U CN 215894977 U CN215894977 U CN 215894977U CN 202122327616 U CN202122327616 U CN 202122327616U CN 215894977 U CN215894977 U CN 215894977U
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Abstract
The utility model discloses a scanning electric method advanced geological prediction device carried on a large-diameter slurry shield, which comprises a measuring electrode arranged on a cutter head or a shield of a shield machine or the cutter head and the shield, wherein the measuring electrode is electrically insulated with the cutter head and the shield, a shield electrode which is used by the shield or the shield and the cutter head, a grounded return electrode and a reference electrode, an angle measuring device arranged at the rotation center of the shield machine and a transmitting and receiving system arranged in the shield machine, the measuring electrode, the shield electrode, the return electrode and the reference electrode are respectively and electrically connected with the transmitting and receiving system through leads, and the angle measuring device is connected and communicated with the transmitting and receiving system. The device disclosed by the utility model can measure the distribution of the electrical parameters of the section to be excavated in front of the tunnel face, realize real-time uninterrupted measurement of the electrical parameters of the stratum and fine detection and evaluation of the front of the tunnel face, and thus provide the specific position of the abnormal geologic body on the section to be excavated for a construction party.
Description
Technical Field
The utility model belongs to the technical field of scanning electric method advanced geological prediction, and particularly relates to a scanning electric method advanced geological prediction device carried on a large-diameter slurry shield in the field.
Background
With the development of large-scale capital construction projects such as domestic railways, highways, water conservancy and the like and the improvement of the capability of a shield machine manufacturer for independently researching and developing the shield machine, the proportion of shield construction adopted in tunnel construction is higher and higher. In shield construction, when encountering water-containing structures such as broken zones, karst caves, underground rivers and the like, serious accidents such as machine damage, project delay, even casualties and the like caused by water inrush disasters are often caused. In order to avoid the above accidents, the geological conditions in front of the tunnel face are usually detected by a method of advanced geological prediction, and reasonable construction plans and treatment measures are preset according to the measurement and evaluation results. At present, a main implementation method and a device for geological exploration aiming at poor water-containing structure in shield (or TBM) construction are a BEAM (Bore-Tunneling electric Ahead Monitoring) system developed by Germany GD company. In recent years, the number of large-diameter tunnels in China is gradually increased, and the commonly used geological forecast results are usually presented in a one-dimensional or two-dimensional mode and cannot meet the requirement of the large-diameter tunnels on detailed evaluation of the tunnel face.
Disclosure of Invention
The utility model aims to provide a scanning electric method advanced geological prediction device which can be carried on a large-diameter slurry shield and can realize detailed evaluation on a rock stratum in front of a large-diameter tunnel face.
The utility model adopts the following technical scheme:
the utility model provides a carry on scanning electric method advance geology prediction device of major diameter slurry shield, its improvement lies in: the measuring electrode is electrically insulated from the cutter head and the shield, the shield or the shield and the cutter head serve as a shielding electrode, the grounded return electrode and the reference electrode, an angle measuring device arranged at the rotation center of the shield machine and an emission and receiving system arranged in the shield machine, the measuring electrode, the shielding electrode, the return electrode and the reference electrode are respectively electrically connected with the emission and receiving system through leads, and the angle measuring device is connected with the emission and receiving system for communication.
Furthermore, when the measuring electrodes are arranged on the cutter head, the number of the measuring electrodes is more than two, and the radial distances from the measuring electrodes to the center of the cutter head are different; when the measuring electrodes are arranged on the shield, the number of the measuring electrodes is more than two.
Further, the return electrode and the reference electrode are formed by a metal conductive rod member including a ground anchor.
Further, the angle measuring means is served by a sensor for measuring an angle including a rotary encoder.
Furthermore, the transmitting and receiving system adopts a portable case or a fixed frame and is placed or installed at a main controller or a PLC of the shield tunneling machine, and the transmitting and receiving system comprises a transmitting circuit, a receiving circuit and a computer.
The advanced geological prediction method of the scanning electrical method carried on the large-diameter slurry shield uses the above device, and the improvement lies in that: the measuring electrode respectively emits low-frequency or direct current to the front of the palm surface; the shielding electrode emits focusing current to the side and the front; under the focusing action, the low-frequency or direct current emitted by the measuring electrode enters deeply into the front of the tunnel face; the apparent resistivity curve and the percentage frequency effect curve are obtained by measuring the apparent resistivity and the frequency domain excitation parameters under different frequencies, and the curve results measured by each measuring electrode reflect the integrity and the water-containing characteristics of rock stratums at different positions of the section to be excavated in front of the face, so that the precise evaluation of the rock stratum in front of the large-diameter face is realized.
The utility model has the beneficial effects that:
the device disclosed by the utility model can measure the distribution of the electrical parameters of the section to be excavated in front of the tunnel face, realize real-time uninterrupted measurement of the electrical parameters of the stratum and fine detection and evaluation of the front of the tunnel face, and thus provide the specific position of the abnormal geologic body on the section to be excavated for a construction party.
The method disclosed by the utility model is based on the device carried on the slurry shield machine, and realizes the fine evaluation of the rock stratum in front of the large-diameter tunnel face by measuring the electrical parameters of the geologic body in front of the tunnel face.
Drawings
Fig. 1 is a schematic view of the general structure of the device disclosed in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Embodiment 1, as shown in fig. 1, this embodiment discloses a scanning electrical method advanced geological prediction device mounted on a large-diameter slurry shield, which includes a measurement electrode 3 mounted on a cutter head 1 and/or a shield 2 of a shield machine, the measurement electrode is electrically insulated from the cutter head and the shield, a shield electrode served by the shield or the shield and the cutter head, a grounded return electrode 4 (B electrode) and a reference electrode 5 (N electrode), an angle measurement device 6 mounted at a rotation center of the shield machine, and a transmitting and receiving system 7 mounted in the shield machine, the measurement electrode, the shield electrode, the return electrode and the reference electrode are respectively electrically connected with the transmitting and receiving system through leads, and the angle measurement device is connected and communicated with the transmitting and receiving system.
In the working process of the shield machine, the transmitting and receiving system feeds low-frequency/direct current to the shielding electrode and the measuring electrode (the current returns to the return electrode through the ground), the equipotential of the measuring electrode and the shielding electrode is kept, the transmitting and receiving system collects the current flowing out of the measuring electrode and the voltage difference between the shield or the cutter head and the reference electrode, the cutter head angle information provided by the angle measuring device is collected, and the apparent resistivity distribution of the section to be excavated in front of the tunnel face is obtained through post signal processing and data processing.
In the embodiment, when the measuring electrodes are arranged on the cutter head, the number of the measuring electrodes is more than two, and the radial distances from the measuring electrodes to the center of the cutter head are different, so that the measuring electrodes are used for measuring the resistivity distribution of the section to be dug in front of the tunnel face; when the measuring electrodes are arranged on the shield, the number of the measuring electrodes is more than two, and the measuring electrodes are used for measuring the geological conditions around the shield machine.
The return electrode and the reference electrode may be formed by a metal conductive rod member such as a ground anchor. The return electrode and the reference electrode are in good contact with the ground, and can be arranged in the tunnel or outside the tunnel.
The angle measuring device is used for measuring the rotating angle position of the cutter head, can be a sensor for measuring angles such as a rotary encoder, and the like, and sends the measured angle information to the transmitting and receiving system to provide the angle information for the post data processing.
The transmitting and receiving system adopts a portable case or a fixed frame and can be placed or installed at the positions of a main controller or a PLC (programmable logic controller) of the shield tunneling machine and the like, and the transmitting and receiving system comprises a transmitting circuit, a receiving circuit and a computer.
The embodiment also discloses a scanning electrical method advanced geological prediction method carried on the large-diameter slurry shield, which uses the device to take a plurality of independent electrodes on a cutter head as measuring electrodes to respectively emit low-frequency or direct current to the front of the palm surface; emitting focusing current to the side and the front by using a shield machine body as a shielding electrode; under the focusing action, the low-frequency or direct current emitted by the measuring electrode enters deeply into the front of the tunnel face; the apparent resistivity curve and the percentage frequency effect curve are obtained by measuring the apparent resistivity and the frequency domain excitation activation parameters under different frequencies, and the curve results measured by each independent measuring electrode can reflect the integrity and the water-containing property of rock strata at different positions of a section to be excavated in front of a tunnel face in a reasonable pole distribution mode, so that the precise evaluation of the rock strata in front of the large-diameter tunnel face is realized.
Claims (5)
1. A scanning electric method advanced geological prediction device carried on a large-diameter slurry shield is characterized in that: the measuring electrode is electrically insulated from the cutter head and the shield, the shield or the shield and the cutter head serve as a shielding electrode, the grounded return electrode and the reference electrode, an angle measuring device arranged at the rotation center of the shield machine and an emission and receiving system arranged in the shield machine, the measuring electrode, the shielding electrode, the return electrode and the reference electrode are respectively electrically connected with the emission and receiving system through leads, and the angle measuring device is connected with the emission and receiving system for communication.
2. The scanning electric method advanced geological prediction device mounted on a large-diameter slurry shield according to claim 1, characterized in that: when the measuring electrodes are arranged on the cutter head, the number of the measuring electrodes is more than two, and the radial distances from the measuring electrodes to the center of the cutter head are different; when the measuring electrodes are arranged on the shield, the number of the measuring electrodes is more than two.
3. The scanning electric method advanced geological prediction device mounted on a large-diameter slurry shield according to claim 1, characterized in that: the return electrode and the reference electrode are served by a metal conductive rod member including a ground anchor.
4. The scanning electric method advanced geological prediction device mounted on a large-diameter slurry shield according to claim 1, characterized in that: the angle measuring device is served by a sensor for measuring angles including a rotary encoder.
5. The scanning electric method advanced geological prediction device mounted on a large-diameter slurry shield according to claim 1, characterized in that: the transmitting and receiving system adopts a portable case or a fixed frame and is placed or installed at a main controller or a PLC of the shield tunneling machine, and the transmitting and receiving system comprises a transmitting circuit, a receiving circuit and a computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122327616.8U CN215894977U (en) | 2021-09-23 | 2021-09-23 | Scanning electrical method advanced geological prediction device carried on large-diameter slurry shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122327616.8U CN215894977U (en) | 2021-09-23 | 2021-09-23 | Scanning electrical method advanced geological prediction device carried on large-diameter slurry shield |
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| Publication Number | Publication Date |
|---|---|
| CN215894977U true CN215894977U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122327616.8U Active CN215894977U (en) | 2021-09-23 | 2021-09-23 | Scanning electrical method advanced geological prediction device carried on large-diameter slurry shield |
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| CN (1) | CN215894977U (en) |
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2021
- 2021-09-23 CN CN202122327616.8U patent/CN215894977U/en active Active
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