Three-dimensional direct current electric method detection device suitable for dam body disease detection

Abstract

The utility model provides a three-dimensional direct current electric method detection device suitable for dam body disease detection, which belongs to the technical field of geophysical exploration, and comprises distributed cables arranged on the upstream face, the downstream face and the top face of a dam body; the distributed cable is connected with a plurality of electrode joints; the plurality of electrodes are respectively connected with the plurality of electrode joints; and the multifunctional three-dimensional distributed electrical method instrument is connected with the distributed cable through two wiring terminals. According to the utility model, the distributed cables and the electrodes are arranged on the upstream face, the downstream face and the top face of the dam body, real three-dimensional space arrangement is realized, more accurate inversion constraint conditions are provided, and the detection accuracy is greatly improved; besides, by adopting the distributed cable arrangement, the arrangement of cables (electrodes) can be increased or decreased at any end without influencing other arranged devices, and the field implementation is very flexible.

Description

TECHNICAL FIELD

[0001] The utility model belongs to geophysical exploration technical field, more specifically, relate to a kind of three-dimensional direct current method detection device suitable for dam disease detection. BACKGROUND

[0002] The dam disease detection of water conservancy and hydropower engineering has been a popular field, and many long-running hydropower stations are plagued by such problems. Geophysical exploration is a non-destructive exploration method, widely used in various fields of national production, solving various engineering and geological problems.

[0003] Compared with destructive drilling core exploration, geophysical exploration is not only non-destructive, but also provides more comprehensive information, and has an irreplaceable role, especially for important projects such as reservoir dams.

[0004] Traditional geophysical exploration of dam disease uses two-dimensional exploration methods, such as 2D high-density resistivity method, transient electromagnetic method, and geological radar method, or multiple two-dimensional high-density resistivity method profiles are used for spatial interpolation after three-dimensional detection. The results obtained cannot reflect the three-dimensional real spatial distribution of the underground, often exaggerating the anomaly or causing abnormal deviation. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a three-dimensional direct current method detection device suitable for dam disease detection, which can realize resistivity CT (tomography) detection of the dam, and achieve true three-dimensional spatial detection. The device directly transmits the internal area of the dam, realizes more direct, efficient and high-resolution detection, and obtains more comprehensive exploration results.

[0006] To achieve the above purpose, the utility model provides a three-dimensional direct current method detection device suitable for dam disease detection, comprising:

[0007] A distributed cable is arranged on the water-facing surface, backwater surface and top surface of the dam; a plurality of electrode connectors are connected to the distributed cable;

[0008] A plurality of electrodes are connected to the plurality of electrode connectors, respectively; and

[0009] A multifunctional three-dimensional distributed electrical method instrument is connected to the distributed cable through two wiring ends.

[0010] Further, the distributed cable includes a plurality of cables, and adjacent two cables are connected through a first cable adapter. One wiring end of the multifunctional three-dimensional distributed electrical method instrument is connected to one of the cables through a second cable adapter, and the other wiring end is directly connected to the other cable.

[0011] Further, the distributed cable is arranged in an S shape on the water-facing surface, the backwater surface and the top surface of the dam body.

[0012] Further, a plurality of electrode connectors are connected to the distributed cable at equal intervals.

[0013] Further, one end of each electrode is closely attached to the surface of the dam body.

[0014] Further, the attachment part of each electrode to the surface of the dam body is coated with a conductive coupling agent or a resistance reducing agent.

[0015] Further, the electrode device used by the multifunctional three-dimensional distributed electrical method instrument is any one of AM, AMN and ABMN.

[0016] Compared with the prior art, the utility model has the following technical effects:

[0017] The three-dimensional direct current electrical method detection device suitable for dam body disease detection of the utility model realizes the real three-dimensional space arrangement by arranging the distributed cable and the electrode on the water-facing surface, the backwater surface and the top surface of the dam body. Since the electrode is distributed on three sides of the dam space, the tomographic detection of the direct current resistivity method can be realized on any different two sides. The electric field directly transmits the inside of the dam body, and the electric field change information of the inside area of the dam body with diseases is directly transmitted to the electrode on the opposite side for receiving. Since the direct current field rays in each direction can be restricted to each other, compared with the two-dimensional electrical method exploration, the detection device of the utility model provides more accurate inversion constraint conditions, and greatly improves the detection accuracy. Since the detection device of the utility model adopts the real three-dimensional space direct current electrical method detection, the obtained data body information is extremely rich, and the stereogram such as high-resolution true three-dimensional electric field intensity, current intensity and apparent resistivity can be obtained, and the technical level of exploration is greatly improved. In addition, the detection device of the utility model can increase or reduce the arrangement of the cable line (electrode) at any one end without affecting other arranged devices by adopting the distributed cable arrangement, and the on-site implementation is very flexible. The detection device of the utility model has a large number of electrodes, and the equipment is completed once, and the efficiency is much higher than that of the two-dimensional high-density electrical method detection on the dam body, and the on-site operation time and economic cost can be effectively saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0019] Figure 1 A three-dimensional direct current method detection device suitable for dam disease detection provided by the embodiment of the utility model is arranged on the whole structure schematic view of dam body;

[0020] Figure 2 A connection structure schematic view of distributed cable, electrode and multifunctional three-dimensional distributed electrical method instrument provided by the embodiment of the utility model is provided;

[0021] Figure 3 For Figure 2 Partial amplification structure schematic view in.

[0022] In the figure, various reference signs:

[0023] 1, distributed cable, 2, first cable adapter, 3, electrode, 4, multifunctional three-dimensional distributed electrical method instrument, 5, electrode connector, 6, second cable adapter. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clear and clear, the utility model is further described in detail in the following with the help of the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0025] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] It should be understood that the terms "length", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0027] The terms used in the embodiment of the utility model are only for the purpose of describing specific examples, and are not intended to limit the utility model. The singular forms "a", "said" and "the" used in the embodiment of the utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0028] The terms "first", "second", "third", etc. are used only for the purpose of description, to distinguish between objects, such as substances, from one another, and cannot be understood as indicating or implying relative importance or implying the number of the indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0029] Please refer to Figures 1-3 A three-dimensional direct current method detection device suitable for dam body disease detection provided by the embodiments of the present application will be described.

[0030] In an embodiment of the present application, the three-dimensional direct current method detection device suitable for dam body disease detection provided by the embodiments of the present application comprises a distributed cable 1, a plurality of electrodes 3 and a multifunctional three-dimensional distributed electrical method instrument 4, the distributed cable 1 is arranged on the water-facing surface, the backwater surface and the top surface of the dam body; a plurality of electrode connectors 5 are connected to the distributed cable 1; the plurality of electrodes 3 are connected to the plurality of electrode connectors 5 respectively; the multifunctional three-dimensional distributed electrical method instrument 4 is connected to the distributed cable 1 through two wiring ends thereof.

[0031] In the present embodiment, the distributed cable 1 is used to realize the transmission of the instructions sent by the multifunctional three-dimensional distributed electrical method instrument 4; the number of the electrodes 3 is consistent with the number of the total electrode connectors 5 on the distributed cable 1, the plurality of electrodes 3 are used to be in close contact with the surface of the dam body, to implement the power supply and receiving measurement of the direct current; the multifunctional three-dimensional distributed electrical method instrument 4 is the instrument host of the entire detection device, which sends instructions according to certain logic, and performs data acquisition and measurement data recording, such as recording the power supply current I, the power supply voltage U, the measurement current AI and the measurement voltage AU. The computer performs data processing according to the three-dimensional space direct current field measurement data body obtained by the multifunctional three-dimensional distributed electrical method instrument 4, mainly including model gridding, using algorithms such as damping least square method and smooth constraint least square method to perform inversion and iteration of the data model, until a certain root mean square error is met, and finally obtaining the inferred geoelectric model.

[0032] In the present embodiment, the measuring line network composed of the electrodes 3, the distributed cable 1 and the like is three-dimensional and distributed in three dimensions, and the measuring line network is distributed on the water-facing surface of the dam body, the top surface of the dam body and the backwater surface of the dam body and the like.

[0033] In this embodiment, distributed cables 1 are laid on the dam surface, allowing for flexible arrangement of the survey network or the location of the multifunctional three-dimensional distributed electrical resistivity meter 4. The distributed cables 1 are continuously laid out. Assuming there are 24 cables, they can be arranged in various forms such as 12×20 grid or 24×10 grid according to actual detection needs. The number of cables is unlimited; as long as there are enough devices, cables and electrodes 3 can be added indefinitely according to the density of the survey network and the size of the dam. One end of the electrode 3 can be tightly attached to the dam surface, whether on a hard surface or a soil / rock surface. The coordinates of each electrode 3 should be pre-designed and precisely measured.

[0034] This invention provides a three-dimensional direct current resistivity tomography (DCST) detection device for dam defect detection. By deploying distributed cables 1 and electrodes 3 on the upstream, downstream, and top surfaces of the dam, a true three-dimensional spatial arrangement is achieved. Since the electrodes 3 are distributed on three sides of the dam space, DCST tomographic imaging can be performed from any two sides. The electric field directly penetrates the dam interior, directly transmitting the electric field change information of the defective internal dam area to the opposite electrode for reception. Because the DC electric field rays in different directions can mutually constrain each other, compared to two-dimensional electrical resistivity tomography, this invention's detection device can acquire electric field information directly transmitted inside the dam. During inversion, more accurate inversion constraints can be utilized, significantly improving the accuracy of inversion analysis of the internal dam structure. The detection accuracy of the diseased body is high. Because the detection device of this utility model adopts true three-dimensional spatial DC electrical method detection, the obtained data volume information is extremely rich. It can obtain high-resolution true three-dimensional three-dimensional images such as electric field intensity, current intensity, and apparent resistivity, which greatly improves the technical level of exploration. In addition, the detection device of this utility model adopts distributed cable 1, which can arbitrarily add or remove cable (or electrode 3) at one end without affecting other deployed devices, making the on-site implementation very flexible. The detection device of this utility model has a large number of electrodes and the equipment is laid out at one time, which is much more efficient than the two-dimensional high-density electrical method detection on the dam body, which can effectively save on-site operation time and reduce economic costs.

[0035] This invention provides a three-dimensional direct current resistivity tomography (DCST) device suitable for dam defect detection. This device enables transmission imaging of a DC electric field within the dam body, similar to well-to-well resistivity tomography, but with a non-destructive feature. When the power supply electrode is on one side of the dam body and the measuring electrode is on the other, transmission resistivity imaging can be performed to obtain high-resolution and rich detection information.

[0036] Further, in the embodiment, the distributed cable 1 comprises a plurality of cables, two adjacent cables are connected by the first cable adapter 2, one connection terminal of the multifunctional three-dimensional distributed electrical method instrument 4 is connected with one cable close to it by the second cable adapter 6, and the other connection terminal is directly connected with another cable close to it, as shown in Figure 2 Specifically, the distributed cable 1 generally comprises 12 cables or more, the number of cables can be unlimitedly expanded according to needs, each cable can be provided with 10 electrode connectors 5, the number of cable adapters (including the first cable adapter 2 and the second cable adapter 6) is consistent with the number of cables, and the cable adapters are used for connection between the cables to realize transmission of instructions sent by the multifunctional three-dimensional distributed electrical method instrument 4; and the total number of electrodes 3 is consistent with the total number of electrode connectors 5 on the cables.

[0037] Further, in the embodiment, the distributed cable 1 is arranged in an S shape (or a snake shape) on the water-facing surface, the backwater surface and the top surface of the dam body, that is, the distributed cable 1 is arranged on the water-facing surface, the top surface and the backwater surface of the dam body to be measured according to a certain rule to realize a true three-dimensional space arrangement. The S-shaped (or the snake-shaped) distribution can be carried out in a single cable unit, more electrodes 3 can be arranged on the limited dam body area, and more detection data can be obtained.

[0038] Further, in the embodiment, the plurality of electrode connectors 5 are connected on the distributed cable 1 at equal intervals, so that the plurality of electrodes 3 are also arranged on the dam body surface at equal intervals to ensure accuracy and consistency of the obtained detection data, simplify the measurement process and improve the detection efficiency.

[0039] Further, in the embodiment, the fitting part of each electrode 3 on the dam body surface is coated with a conductive coupling agent or a resistance reducing agent, that is, the electrode 3 is tightly fitted on the dam body surface through the conductive coupling agent or the resistance reducing agent, and the electrode 3 can better transmit and receive current.

[0040] Further, in the embodiment, the electrode device that can be used by the multifunctional three-dimensional distributed electrical method instrument 4 is any one of pole-pole (AM), pole-dipole (AMN) and dipole-dipole (ABMN) to realize a true three-dimensional electrical method detection and transmission imaging.

[0041] The utility model embodiment further provides a use method of a three-dimensional direct current electrical method detection device suitable for dam body disease detection, and the use method comprises the following steps:

[0042] (1) Measurement and point setting: according to a target detection area, a design measurement line network is arranged, and the coordinates of each electrode 3 are determined. Point position measurement and setting are performed on the spot by using professional measurement equipment.

[0043] (2) electrode 3 arrangement: the electrode 3 that can be closely attached to the dam surface is fixed according to the design coordinates in a certain order, and the resistance reduction measures are well done.

[0044] (3) connecting electrode 3: each electrode 3 is sequentially connected to electrode connector 5 according to the order of each row.

[0045] (4) connecting cable and main measuring station: the cable is connected between the cable and the multifunctional three-dimensional distributed electrical method instrument 4 through the first cable adapter 2 and the second cable adapter 6.

[0046] (5) grounding resistance test: after the system arrangement is completed, the multifunctional three-dimensional distributed electrical method instrument 4 is used for grounding resistance test until all qualified, meeting the test requirements.

[0047] (6) data acquisition: connect the power supply, and perform three-dimensional high-density electrical method data acquisition. The data acquisition can use pole-pole (AM), pole-dipole (AMN) and dipole-dipole (ABMN) electrode devices.

[0048] (7) instrument recovery: after the data acquisition is completed and the data is confirmed to be effective, all equipment is recovered.

[0049] (8) data processing: based on damping least square method, smooth constraint least square method and other algorithms, the data model is inverted and iterated until a certain root mean square error is met, and the inferred geoelectric model is obtained.

[0050] For example: a total of 240 electrodes 3, arranged in the form of 20*12, among which the water-facing surface of the dam is arranged with 20*4 electrodes 3, the dam top is arranged with 20*3 electrodes 3, and the backwater surface is arranged with 20*5 electrodes 3, forming a spatial trapezoidal body layout as a whole. The multifunctional three-dimensional distributed electrical method instrument 4 is used for data acquisition and data quality analysis, and the equipment is recovered after the on-site data acquisition is completed.

[0051] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A three-dimensional direct current method detection device suitable for dam body disease detection, characterized in that, The utility model relates to a kind of multi-functional three-dimensional distributed electrical method instrument and its electrode device, which is suitable for dam safety monitoring. It comprises: Distributed cable, which is laid on the upstream face, downstream face and top face of dam body; A plurality of electrode connectors are connected to the distributed cable; A plurality of electrodes are connected to the plurality of electrode connectors respectively; One end of each electrode is closely combined with the surface of dam body to supply and receive direct current for measurement; The supply electrode is on one side of dam body, and the measurement electrode is on the other side of dam body; And 2. The three-dimensional direct current method detection device for dam disease detection according to claim 1, wherein, The multi-functional three-dimensional distributed electrical method instrument is connected to the distributed cable through two connection terminals; The distributed cable comprises a plurality of cables, and two adjacent cables are connected through a first cable adapter; One connection terminal of the multi-functional three-dimensional distributed electrical method instrument is connected to one of the cables through a second cable adapter, and the other connection terminal is directly connected to the other cable.

3. The three-dimensional direct current method detecting device for dam disease detection according to claim 1, wherein, The distributed cable is laid in S shape on the upstream face, downstream face and top face of dam body.

4. The three-dimensional direct current method detecting device for dam disease detection according to claim 1, wherein, The plurality of electrode connectors are connected to the distributed cable at equal intervals.

5. The three-dimensional direct current method detection device for dam disease detection according to any one of claims 1-4, characterized in that, The combined part of each electrode with the surface of dam body is coated with conductive coupling agent or resistance-reducing agent. The electrode device used by the multi-functional three-dimensional distributed electrical method instrument is any one of AM, AMN and ABMN.

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