Dragging type land multi-channel direct-current resistivity exploration system

Abstract

The invention discloses a dragging type land multi-channel direct-current resistivity exploration system which comprises a mobile platform and a plurality of dragging type electrodes connected with the mobile platform. The dragging type electrodes comprise two power supply electrodes and at least one group of exploration electrodes, the exploration electrodes and the power supply electrodes are arranged in a dipole-dipole device, all the dragging type electrodes are in dragging connection with the mobile platform according to a fixed arrangement interval, and all the dragging type electrodes are driven by the mobile platform to integrally move and drag on the exploration ground; all the dragging type electrodes are electrically connected with a multi-channel direct-current resistivity acquisition host arranged on the mobile platform through a multi-channel large cable; and the active water supply device is used for improving the electric conductivity between the dragging type electrode and the exploration ground. By adopting the design of the active water supply device and the dragging type electrode, non-driven type electrode power supply and potential measurement on flat grounds such as land dams and roads are realized, and the problem of low data acquisition efficiency of a traditional high-density resistivity method is effectively improved.

Description

Technical Field

[0001] The invention discloses a towed onshore multi-channel DC resistivity exploration system, which belongs to the field of electrical exploration, and in particular to parallel acquisition of DC resistivity data in a flat grounding environment such as a dam, a highway, etc. Background Art

[0002] When conducting electrical exploration, the existing high-density DC resistivity technology needs to supply power to the underground and measure the potential by driving ground electrodes into the ground or using capacitive coupling. The method of driving ground electrodes is destructive to the working environment and is not suitable for environments such as dams and roads that have been built. It also has low work efficiency. After collecting data in each area, the electrodes need to be removed and then the electrode installation and construction needs to be repeated for the next exploration area, making it impossible to achieve continuous and rapid data collection. In addition, due to the expansion capabilities of the observation system, it is often necessary to lay large cables and electrodes multiple times to complete the measurement of the entire working area. The capacitive coupling method cannot achieve high current power supply. The capacitive coupling method is more sensitive to external electromagnetic interference and has poor anti-interference ability. It has low coupling ability and is difficult to generate sufficient electric field response in deeper formations. The data quality and exploration depth are greatly limited. Summary of the invention

[0003] The technical problem solved by the present invention is: to provide a towed onshore multi-channel DC resistivity exploration system in view of the low efficiency of electrical exploration using fixed electrodes driven into the ground.

[0004] The present invention is implemented by the following technical solutions:

[0005] A towed onshore multi-channel DC resistivity exploration system comprises a mobile platform 3 and a plurality of towed electrodes 4 connected to the mobile platform 3; the towed electrodes 4 comprise two power supply electrodes and at least one group of exploration electrodes arranged in a dipole-dipole arrangement with the power supply electrodes; all the towed electrodes 4 are towed and connected to the mobile platform 3 at a fixed arrangement interval, and the mobile platform 3 drives all the towed electrodes 4 to move and drag as a whole on the exploration ground; all the towed electrodes 4 are electrically connected to a multi-channel DC resistivity acquisition host 1 arranged on the mobile platform 3 through a multi-channel cable; and an active water supply device 2 is also included to increase the conductivity between the towed electrodes 4 and the exploration ground.

[0006] In the towed onshore multi-channel DC resistivity exploration system of the present invention, further, all the towed electrodes 4 are connected to the multi-channel cable 5, and the multi-channel cable 5 has integrated lines electrically connected to each electrode. All the towed electrodes 4 are towed and connected to the mobile platform 3 through the multi-channel cable 5.

[0007] In the towed onshore multi-channel DC resistivity exploration system of the present invention, further, the towed electrode 4 is provided with a cable through hole 403 for the multi-channel cable 5 to pass through, and the inner wall of the cable through hole 403 is provided with an electrode spring 402 electrically connected to the internal line of the multi-channel cable 5. The multi-channel cable 5 is fixedly passed through the cable through hole 403 of the towed electrode 4, and is electrically connected to the towed electrode through the electrode spring 402, thereby realizing the physical connection and electrical connection between the towed electrode and the multi-channel cable.

[0008] In the towed onshore multi-channel DC resistivity exploration system of the present invention, further, the towed electrode 4 is detachably spliced ​​through the spliced ​​electrode bodies 41 symmetrically along the axis of the cable through hole, thereby improving the maintainability of the electrode.

[0009] In the towed onshore multi-channel DC resistivity exploration system of the present invention, further, the towed electrode 4 is an ellipsoid or spindle electrode with small ends and a large middle, and a wear-resistant conductive coating is provided on the surface of the electrode.

[0010] In the towed onshore multi-channel DC resistivity exploration system of the present invention, further, the multi-channel DC resistivity acquisition host 1 is integrated with a differential GPS positioning module 101 .

[0011] As a preferred embodiment of the towed onshore multi-channel DC resistivity exploration system of the present invention, the active water supply device 2 includes a water tank 21 and a water distribution seat 22. The water tank 21 is arranged on the mobile platform 3. A multi-porous water outlet valve 211 is provided at the bottom of the water tank. The water distribution seat 22 is connected to the multi-porous water outlet valve 211. The multiple water inlets on the water distribution seat are connected one by one with the multiple outlets of the multi-porous water outlet valve 211. The water distribution seat 22 is provided with a water curtain outlet 222 for discharging water to the ground. The width of the water curtain formed by the water curtain outlet 222 exceeds the lateral distribution range of all towed electrodes.

[0012] As another preferred embodiment of the towed onshore multi-channel DC resistivity exploration system of the present invention, the active water supply device 2 includes a water tank 21 and a plurality of electrode water spraying units 23. The water tank 21 is arranged on the mobile platform 3. All the electrode water spraying units 23 are towed and connected to the mobile platform 3 at the same fixed arrangement spacing as the towed electrodes, and correspond one-to-one with the towed electrodes. All the electrode water spraying units 23 are nozzles 231 arranged on rollers 232. The nozzles 231 are connected to the water supply of the water tank 21 through connecting water pipes 24, and spray water toward the corresponding towed electrodes.

[0013] In the above-mentioned towed onshore multi-channel DC resistivity exploration system of the present invention, further, two electrode water spraying units 23 are symmetrically provided on both sides of each towed electrode, and the electrode water spraying units 23 on the same side of all towed electrodes are connected to the same connecting water pipe 24, and the electrode water spraying units connected in series on both sides and the towed electrodes connected in series in the middle are connected to the tail trailer 6 at the end away from the mobile platform.

[0014] In the towed onshore multi-channel DC resistivity exploration system of the present invention, further, the water tank 21 contains a conductive saline solution.

[0015] The present invention adopts the above technical solution to achieve the following beneficial effects:

[0016] (1) The present invention provides a new towed onshore multi-channel DC resistance exploration system for electrical exploration of flat land such as dams and roads on land. A mobile platform is used to drag all electrodes on the exploration ground and move them as a whole. In combination with a towed electrode with small ends and a large middle, after completing the exploration of a ground area, all towed electrodes are dragged to the next exploration area through the mobile platform, thereby realizing continuous, rapid and accurate exploration of the exploration ground. The towed electrode uses a multi-channel large cable to simultaneously realize the towed connection with the mobile platform and the electrical connection with the multi-channel DC resistivity acquisition host, which saves the line layout of the towed system. The exploration of the exploration ground can be realized by controlling the mobile platform, and the exploration operation is simpler and the exploration efficiency is high.

[0017] (2) The present invention collects electrical signals when the dragged electrode contacts the exploration ground. It does not need to drive the electrode into the ground, and will not damage the smooth ground after construction, thus ensuring the integrity of the exploration ground. At the same time, by setting an active water supply device to improve the conductivity of the dragged electrode grounding, the accuracy of the ground electrical signal collection during the electrode contact exploration process is enhanced, and the onshore high-density DC resistivity dragged continuous collection is realized.

[0018] (3) The present invention uses a multi-channel DC resistivity acquisition host with an integrated differential GPS positioning module to achieve drag-and-drop data acquisition of high-density DC resistivity. By real-time positioning of the mobile platform, the position of the acquisition point is accurately recorded during drag-and-drop data acquisition.

[0019] In summary, the towed onshore multi-channel DC resistivity exploration system provided by the present invention adopts an active water supply device and a towed electrode design, which realizes non-penetrating electrode power supply and potential measurement on flat ground such as onshore dams and roads, and combines differential GPS positioning with multi-channel data acquisition to realize towed data acquisition for high-density DC resistivity of the ground, effectively improving the problem of low data acquisition efficiency of the traditional high-density resistivity method, and providing technical support for flood control and inspection of dams.

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an overall schematic diagram of the towed onshore multi-channel DC resistivity exploration system of Example 1.

[0022] Figure 2 Schematic diagram of the water tank of the active water supply device in Example 1.

[0023] Figure 3 Schematic diagram of the water distribution seat of the active water supply device in Example 1.

[0024] Figure 4a , 4b They are schematic diagrams of the dragging electrode in the first embodiment.

[0025] Figure 5 This is a schematic diagram of the multi-channel DC resistivity acquisition host in Example 1.

[0026] Figure 6 This is a schematic diagram of a multi-channel DC resistivity acquisition circuit according to Embodiment 1.

[0027] Figure 7 This is an overall schematic diagram of the towed onshore multi-channel DC resistivity exploration system of Example 2.

[0028] Figure 8 Schematic diagram of the electrode water spray unit of the active water supply device in Example 2.

[0029] Fig. 9 Schematic diagram of the nozzle and roller of the electrode water spray unit in the second embodiment.

[0030] Numbers in the figure: 1-multi-channel DC resistivity acquisition host, 101-differential GPS positioning module, 2-active water supply device, 21-water tank, 211-multi-hole water outlet valve, 22-water distribution seat, 221-water inlet, 222-water curtain outlet, 23-electrode water spray unit, 231-sprinkler, 232-roller, 233-water spray connector, 24-connecting water pipe, 3-mobile platform, 4-drag electrode, 41-spliced ​​electrode body, 401-electrode screw hole, 402-electrode shrapnel, 403-large cable through hole, 5-multi-channel large cable, 6-tail trailer. DETAILED DESCRIPTION

[0031] Embodiment 1

[0032] See also Figure 1 , the figure shows a specific implementation scheme of the towed onshore multi-channel DC resistivity exploration system of the present invention, which specifically includes a multi-channel DC resistivity acquisition host 1, an active water supply device 2, a mobile platform 3, a towed electrode 4, and a multi-channel cable 5.

[0033] In this embodiment, the mobile platform 3 and the sixteen groups of drag-type electrodes connected to the mobile platform 3 are the main body of the exploration system. The mobile platform 3 is a mobile vehicle equipped with a multi-channel DC resistivity acquisition host 1, an active water supply device 2 and a drag-type electrode 4, which can be implemented by a trolley or an electric drive trolley. The drag-type electrode 4 in this embodiment includes two power supply electrodes C and fourteen exploration electrodes P. Several exploration electrodes P and the power supply electrodes C form a dipole-dipole device for simultaneous multi-channel acquisition. All the drag-type electrodes 4 are dragged and connected to the mobile platform 3 according to a fixed arrangement spacing. In this embodiment, after all the drag-type electrodes 4 are equidistantly connected in series to the mobile platform 3, the mobile platform 3 drives all the drag-type electrodes 4 to move and drag as a whole on the exploration ground. All the drag-type electrodes 4 are electrically connected to the multi-channel DC resistivity acquisition host 1 set on the mobile platform 3 through a multi-channel cable 5. The multi-channel DC resistivity acquisition host 1 is provided with a multi-channel DC resistivity acquisition circuit, and the electrical signals of the exploration ground are multi-channelly acquired and processed through the drag-type electrodes. After completing the exploration of a ground area, the mobile platform directly moves all the dragging electrodes as a whole to the next area to achieve continuous exploration.

[0034] Further, all the towed electrodes 4 are connected in series to the multi-channel cable 5, which is a multi-core cable with integrated lines electrically connected to each electrode. At the same time, all the towed electrodes 4 are connected to the mobile platform 3 through the multi-channel cable 5. The multi-channel cable 5 connected from the multi-channel DC resistivity acquisition host 1 is first clamped and fixed by the wire pipe clamp on the mobile platform 3, and then extended to be connected in series with the towed electrodes 4, thus avoiding the multi-channel cable 5 directly connected to the mobile platform 3 through the multi-channel DC resistivity acquisition host 1. In this embodiment, all the towed electrodes 4 are connected to the multi-channel cable 5 at equal intervals. The multi-channel cable 5 serves as a cable electrically connected between the towed electrodes 4 and the multi-channel DC resistivity acquisition host 1, and also as a tow rope for towing the towed electrodes 4 and the mobile platform 3, avoiding the problem of redundant lines during the exploration process caused by setting too many cables.

[0035] See also Figure 5The multi-channel DC resistivity acquisition host 1 of this embodiment has a built-in differential GPS positioning module 101 and a multi-channel high-speed acquisition card to realize system positioning and data acquisition. The differential GPS positioning module 101 can accurately record the location of the acquisition point during dragging data acquisition. The acquisition program is controlled by an industrial computer. The multi-channel DC resistivity acquisition host 1 supplies power to the underground through the dragging electrode 4 through an external DC high-voltage battery box, and measures the current internally through a high-stability sampling resistor. The multi-channel DC resistivity acquisition host 1 is fixedly installed on the mobile platform 3 and moves with the mobile platform 3. The multi-channel DC resistivity acquisition host has a multi-channel acquisition card with an integrated multi-channel DC resistivity acquisition circuit, which is electrically connected to the dragging electrode 4 through the multi-core line in the multi-channel cable 5, and is collected and controlled by real-time communication with the differential GPS positioning module 101, and the ground is powered by controlling the Sic full-bridge circuit. In this embodiment, the multi-channel DC resistivity acquisition host 1 uses the Nodaga TPC6000-B101-C1 as an industrial computer, the multi-channel acquisition card uses the ART USB5633-D, and the differential GPS positioning module 101 uses the Alpha 6 high-precision mapping GPS.

[0036] The multi-channel DC resistivity acquisition host 1 is electrically connected to the multi-channel cable 5. Figure 6 As shown, the two power supply electrodes C connected in series on the multi-channel cable 5 are connected to the low-frequency high-voltage power supply on the multi-channel DC resistivity acquisition host to form a loop to supply power to the exploration ground. The remaining fourteen exploration electrodes P are connected to the power supply electrode C through dipole-dipole wiring. The multi-channel cable 5 contains sixteen core wires, of which the two core wires connecting the two power supply electrodes C are connected to the positive and negative poles of the power supply from the host. One end of the remaining fourteen core wires is connected to the dragging electrode, and the other end is connected to the signal conditioning module in the host. Then the signal conditioning module inputs the signal to the multi-channel acquisition card for data acquisition and processing, and simultaneously collects the multi-point potential of the exploration ground through multi-channel. The number of exploration electrodes P can be adjusted according to the actual exploration area size and the setting spacing. The specific multi-channel DC resistivity circuit principle belongs to the mature electrical exploration acquisition technology, and this embodiment will not be elaborated here.

[0037] At the same time, this embodiment also uses a multi-channel cable 5 as a tow rope for connecting all the towed electrodes 4 in series. Figure 4a and 4b A cable through hole 403 is provided on the dragging electrode 4 for the multi-channel cable 5 to pass through. The inner wall of the cable through hole 403 is provided with an electrode spring 402 electrically connected to the internal line of the multi-channel cable 5. The multi-channel cable 5 is fixedly passed through the cable through hole 403 of the dragging electrode 4 and is electrically connected to the dragging electrode through the electrode spring 402. The electrode spring 402 is made of brass spring with high conductivity.

[0038] A multi-section rigid body can be used on the multi-channel cable 5 to be plugged into the cable through hole 403 of the dragging electrode 4. The cables and sockets connected to the dragging electrodes 4 are pre-arranged inside the multi-channel cable 5. After the rigid body on the multi-channel cable 5 is installed in the cable through hole 403 of the dragging electrode, the dragging electrode is realized through the axial positioning component on the rigid body. The axial positioning of the cable through hole 403 can be achieved by machining a positioning shoulder or installing a clamp ring on the rigid body, and the electrode spring 402 in the cable through hole 403 is aligned and connected through the reserved electrical socket on the multi-channel cable, so as to realize the electrical connection and physical connection between the multi-channel cable 5 and the dragging electrode 4 at the same time. The multi-channel cable 5 is a multi-core cable, on which a socket that can be connected to the electrode spring 402 on the dragged electrode is distributed according to the distribution spacing of the dragged electrodes. The dragged electrodes 4 described in this embodiment are connected in series on the multi-channel cable 5, which refers to the physical series connection between all the dragged electrodes through the multi-channel cable, and does not mean that all the dragged electrodes are connected in series through the multi-channel cable. The line arrangement of the multi-channel DC resistivity acquisition circuit between the dragged electrodes and the multi-channel DC resistivity acquisition host in the multi-channel cable 5 is a mature electrical exploration technology. This embodiment does not repeat the line arrangement of the acquisition circuit in the multi-channel cable 5.

[0039] The dragging electrode 4 in this embodiment adopts a split assembly structure. The dragging electrode 4 is divided into two spliced ​​electrode bodies 41 that are separated in half along the axial direction of the cable through hole. Electrode screw holes 401 that can be detachably fixed by screws are processed on the electrode entities of the spliced ​​electrode bodies 41 located on both sides of the cable through hole. The dragging electrode 4 is spliced ​​into an integral electrode through two symmetrical spliced ​​electrode bodies 41.

[0040] When the dragging electrode 4 is installed on the multi-channel cable, the separated spliced ​​electrode bodies 41 are snapped on the installation position of the multi-channel cable 5 from both sides, and then fixedly connected into an integral dragging electrode 4 by detachable connectors such as screws or tying rings to complete the installation and fixation of the dragging electrode on the multi-channel cable 5, and at the same time, the two halves of the spliced ​​electrode body 41 are used to clamp the dragging electrode 4 on the multi-channel cable. The separated spliced ​​electrode body 41 is also more convenient for achieving accurate and reliable electrical connection between the electrode shrapnel inside the cable through hole 403 and the interface on the multi-channel cable 5. Since the dragging electrode 4 rarely rotates during the towing process, the electrode body side located at the bottom will be more worn than the upper side due to long-term friction with the ground. The spliced ​​electrode body 41 with a detachable structure can also facilitate the replacement of the half of the electrode body that is more worn, reducing the cost of replacing the entire electrode body.

[0041] See again Figure 4aThe dragging electrode 4 of this embodiment adopts an ellipsoid or spindle electrode with small ends and a large middle. The electrode body adopts a good conductor material, such as a copper electrode, and a wear-resistant conductive coating is provided on the electrode surface. The ellipsoid or spindle electrode can ensure that the protruding part of the electrode body is always in contact with the ground during the process of being moved and dragged by the multi-channel large cable. The wear-resistant conductive coating is provided on the surface of the electrode body to further reduce the wear of the dragging electrode when it is moved and dragged on the exploration ground, increase the service life of the electrode, and can adapt to the flat and hard ground environment.

[0042] This embodiment also includes an active water supply device 2 for improving the conductivity between the dragging electrode 4 and the exploration ground. Figure 2 and Figure 3 As shown, the active water supply device 2 includes a water tank 21 and a water distribution seat 22. The water tank 21 is arranged on the mobile platform 3. The water tank 21 is filled with a saline solution with good conductivity. A multi-porous water outlet valve 211 is arranged at the bottom of the water tank. The water distribution seat 22 is connected to the multi-porous water outlet valve 211. A plurality of water inlets 221 on the water distribution seat 22 are connected one by one with a plurality of outlets of the multi-porous water outlet valve 211. A water curtain outlet 222 for discharging water to the ground is arranged on the water distribution seat 22. The width of the water curtain formed by the water curtain outlet 222 exceeds the lateral distribution range of all the towed electrodes.

[0043] The active water supply device 2 in this embodiment is all arranged on the mobile platform 3. During the movement of the mobile platform 3, the multi-hole water outlet valve 211 is opened, and the water in the water tank 21 forms a water curtain sprayed on the ground through the water curtain outlet 222 of the water distribution seat 22 under the action of gravity. Since the mobile platform 3 drives the towed electrode connected behind to drag on the exploration ground, the active water supply device 2 wets the exploration ground first, so that the ground environment is moistened when the towed electrode 4 behind is dragged, which is conducive to improving the conductivity of the towed electrode 4 and the exploration ground. This embodiment adopts the method of distributing water to the exploration ground with a water curtain, and the width of the water distribution can cover the ground range where all towed electrodes move, ensuring that all electrodes can be humidified.

[0044] Embodiment 2

[0045] See also Figure 7 , the figure shows another specific implementation scheme of the towed onshore multi-channel DC resistivity exploration system of the present invention, which specifically includes a multi-channel DC resistivity acquisition host 1, an active water supply device 2, a mobile platform 3, a towed electrode 4, a multi-channel cable 5 and a tail trailer 6. The exploration main structure of the multi-channel DC resistivity acquisition host 1, the mobile platform 3, the towed electrode 4 and the multi-channel cable 5 in this embodiment is the same as that in the first embodiment. Different from the first embodiment in which the exploration ground is sprayed with water for humidification in advance, this embodiment adopts an active water supply method of accurately spraying water on each electrode.

[0046] Specific as Figure 8and Fig. 9 As shown, the active water supply device 2 in this embodiment includes a water tank 21, an electrode water spray unit 23 and a connecting water pipe 24. The water tank 21 is arranged on the mobile platform 3. The water tank 21 is filled with a saline solution with good conductivity. All the electrode water spray units 23 are dragged and connected to the mobile platform 3 according to the same fixed arrangement spacing as the towed electrodes, and correspond one-to-one with the positions of the towed electrodes. All the electrode water spray units 23 are nozzles 231 arranged on rollers 232. The nozzles 231 are connected to the water supply of the water tank 21 through the connecting water pipe 24. The nozzles 231 move synchronously with the towed electrodes 4 through the rollers 232 and spray water toward the corresponding towed electrodes for humidification.

[0047] The electrode water spray unit 23 in this embodiment specifically includes a spray head 231, a roller 232 and a water spray connector 233. The spray head 231, the roller 232 and the connecting water pipe 24 are all connected and installed through the water spray connector 233. The water spray connector 233 in this embodiment is a three-way structure, in which two straight-through interfaces are respectively connected to the upper-level connecting water pipe and the lower-level connecting water pipe. The spray head 231 is arranged on another bypass interface, and the roller 232 is rotatably installed on the joint pipe on the inner side of the bypass interface through a bearing. The roller 232 drives the water spray connector 233 to move forward, and the spray head 231 sprays water to the corresponding dragging electrode moving sideways.

[0048] The electrode water spray unit 23 and the corresponding towed electrode 4 are towed synchronously by the mobile platform 3 to humidify the electrode surface and the exploration ground to increase conductivity. The electrode water spray unit 23 can be transferred by using a separate tow rope, or it can be directly towed by using the connecting water pipe 24 for water supply connection of the electrode water spray unit 23 as a tow rope. The water spray connector 233 of each electrode water spray unit 23 is firmly connected to the connecting water pipes 24 of each stage through threaded joints on both sides. The multi-stage connecting water pipes 24 form a flexible connection between adjacent electrode water spray units 23, which can adapt to the directional movement of the electrode water spray unit 23 during towing.

[0049] A water supply connection is realized between the connecting water tank 24 directly connected to the water tank 21, and water is supplied to all the connected electrode water spraying units 23. The power of water supply can be achieved by passive water supply through the water pressure in the water tank, or by active water supply by setting a pressure pump and a connecting water pipe in the water tank. All nozzles spray fine salt water spray toward the corresponding dragging electrode after pressurization, so that the electrode surface is always in a wet state, achieving good grounding and conductive conditions between the exploration ground.

[0050] Furthermore, in this embodiment, two electrode water spray units 23 are symmetrically provided on both sides of each towed electrode, and the electrode water spray units 23 on the same side of all the towed electrodes are connected to the same connecting water pipe 24. The electrode water spray units 23 connected in series on both sides and the towed electrode 4 connected in series in the middle are all connected to the tail trailer 6 at the end away from the mobile platform.

[0051] The electrode water spraying units 23 are symmetrically arranged on both sides of the towed electrode, and the electrodes are sprayed with water and humidified from both sides at the same time, which can avoid the blockage of the nozzle on one side causing the electrode to be unable to be sprayed with water and humidified. At the same time, the electrode water spraying units driven by rollers arranged on both sides can ensure the stability of the towed electrode during the towing process, and avoid deviation to one side due to the traction of the electrode water spraying unit on one side. One end of the series-connected electrode water spraying unit 23 and the towed electrode 4 are connected to the mobile platform 3 and the water tank thereon, and the other end is connected through the tail tow frame 6, connecting the two towing systems of the electrode water spraying unit 23 and the towed electrode 4 into a whole, so that the electrode water spraying unit 23 and the towed electrode 4 in the towed movement form a good integrity, so that the electrode water spraying unit 23 can reliably spray water and humidify the towed electrode 4.

[0052] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of expressing the technical solutions and the convenience of description, and therefore should not be understood as limitations of the present invention.

[0053] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0054] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Towed onshore multi-channel DC resistivity exploration system, characterized by: It comprises a mobile platform (3) and a plurality of drag-type electrodes (4) connected to the mobile platform (3); The dragged electrodes (4) include two power supply electrodes and at least one group of exploration electrodes arranged in a dipole-dipole arrangement with the power supply electrodes. All the dragged electrodes (4) are dragged and connected to the mobile platform (3) at a fixed arrangement interval, and the mobile platform (3) drives all the dragged electrodes (4) to move and drag as a whole on the exploration ground. All the dragged electrodes (4) are electrically connected to a multi-channel DC resistivity acquisition host (1) arranged on the mobile platform (3) through a multi-channel large cable (5); It also includes an active water supply device (2) for improving the conductivity between the dragging electrode (4) and the exploration ground.

2. The towed onshore multi-channel DC resistivity exploration system according to claim 1 is characterized in that: All the towed electrodes (4) are connected in series to a multi-channel cable (5), and the multi-channel cable (5) is internally integrated with circuits electrically connected to each electrode. All the towed electrodes (4) are towed and connected to the mobile platform (3) via the multi-channel cable (5).

3. The towed onshore multi-channel DC resistivity exploration system according to claim 2 is characterized in that: The dragging electrode (4) is provided with a cable through hole (403) for the multi-channel cable (5) to pass through, and the inner wall of the cable through hole (403) is provided with an electrode spring (402) electrically connected to the internal line of the multi-channel cable (5). The multi-channel cable (5) is fixedly passed through the cable through hole (403) of the dragging electrode (4) and is electrically connected to the dragging electrode through the electrode spring (402).

4. The towed onshore multi-channel DC resistivity exploration system according to claim 3 is characterized in that: The dragging electrode (4) is detachably spliced ​​by splicing electrode bodies (41) symmetrically along the axis of the large cable through hole.

5. The towed onshore multi-channel DC resistivity exploration system according to claim 4 is characterized in that: The dragging electrode (4) is an ellipsoid or spindle electrode with small ends and a large middle, and a wear-resistant conductive coating is provided on the surface of the electrode.

6. The towed onshore multi-channel DC resistivity exploration system according to claim 1 is characterized in that: The multi-channel DC resistivity acquisition host (1) is integrated with a differential GPS positioning module (101).

7. The towed onshore multi-channel DC resistivity exploration system according to claim 1 is characterized in that: The active water supply device (2) comprises a water tank (21) and a water distribution seat (22); the water tank (21) is arranged on a mobile platform (3); a multi-hole water outlet valve (211) is arranged at the bottom of the water tank; the water distribution seat (22) is connected to the multi-hole water outlet valve (211); a plurality of water inlets on the water distribution seat are connected one-to-one with a plurality of outlets of the multi-hole water outlet valve (211); a water curtain outlet (222) for discharging water to the ground is arranged on the water distribution seat (22); the width of the water curtain formed by the water curtain outlet (222) exceeds the lateral distribution range of all the towed electrodes.

8. The towed onshore multi-channel DC resistivity exploration system according to claim 1 is characterized in that: The active water supply device (2) comprises a water tank (21) and a plurality of electrode water spraying units (23). The water tank (21) is arranged on a mobile platform (3). All the electrode water spraying units (23) are dragged and connected to the mobile platform (3) at a fixed arrangement spacing that is the same as that of the dragged electrodes, and correspond one to one with the dragged electrodes. All the electrode water spraying units (23) are nozzles (231) arranged on rollers (232). The nozzles (231) are connected to the water supply of the water tank (21) through a connecting water pipe (24) and spray water toward the corresponding dragged electrodes.

9. The towed onshore multi-channel DC resistivity exploration system according to claim 8, characterized in that: Two electrode water spraying units (23) are symmetrically arranged on both sides of each towed electrode. The electrode water spraying units (23) on the same side of all towed electrodes are connected in series to the same connecting water pipe (24). The electrode water spraying units connected in series on both sides and the towed electrode connected in series in the middle are connected to the tail trailer (6) at the end away from the mobile platform.

10. The towed onshore multi-channel DC resistivity exploration system according to claim 7 or 9, characterized in that: The water tank (21) contains a conductive saline solution.

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