Fixed electrode type monitoring device for water infiltration in fractured soil body

Abstract

A fixed electrode type crack soil body water infiltration monitoring device comprises an organic glass container, the organic glass container is of a box-shaped structure, the top face of the organic glass container is transparent, a remolded soil body is contained in an inner cavity of the organic glass container, an activated carbon adsorption layer is laid on the top face of the remolded soil body, a prefabricated crack is formed in the remolded soil body, and the top face of the remolded soil body is provided with an activated carbon adsorption layer. The top end of the prefabricated crack penetrates through the activated carbon adsorption layer, a plurality of electrode fixing plates are laid on the top surface of the activated carbon adsorption layer, a plurality of electrode bars vertically penetrate through the electrode fixing plates, and the top ends of all the electrode bars are sequentially connected through a cable; according to the utility model, the electrode placement time can be saved, and the electrode placement distance precision is improved; in addition, the device is low in manufacturing cost and can be used for two-dimensional high-density measurement and three-dimensional high-density measurement; the scheme is supported by the youth science fund project of the national natural science fund, the serial number is 42207200, and the scheme is a coupling infiltration mechanism of dominant flow and matrix flow in fissure soil of the loess plateau edge irrigation area.

Description

Technical Field

[0001] The utility model relates to the technical field of soil infiltration monitoring, in particular to a fixed electrode type water infiltration monitoring device in a fissured soil. Background Art

[0002] The infiltration of water in the soil increases the moisture content in the soil, and it is easy to infiltrate to the bottom of the soil along the cracks to form a saturated area. This saturated area not only affects the stability of the soil, but also has a serious impact on various underground engineering facilities. Therefore, the infiltration characteristics of water in soil cracks need to be explored in depth.

[0003] In the prior art, the high-density electrical method instrument is a commonly used water infiltration research device. It solves underground geological problems by observing and studying the distribution law of artificially established underground stable current fields. It has the characteristics of intuitiveness, high efficiency, high resolution, high precision, etc. It studies the changes in the electrical properties of underground media by observing the changes in the artificially established stable current field on the ground, and judges the buried depth, nature and shape of underground obstacles by analysis; specifically, on the pre-selected survey lines and survey points, electrodes are arranged and connected to a special electrode conversion device with a multi-core cable; the measurement program of the instrument controls the combination of these electrodes into specified electrode devices and electrode distances, and quickly completes the resistivity observation of multiple electrode devices and multiple electrode distances at multiple survey points of the observation profile, and then with the corresponding data processing, mapping and interpretation software, the given geological exploration task can be completed in time; because the outdoor site is large in scale, the implementation is relatively difficult and the cost is high, therefore, indoor physical simulation is often used to study the infiltration characteristics of water in geological bodies, and high-density electrical method is used as a monitoring means for research, and the operation steps and methods need to be the same as those outdoors.

[0004] However, the simulation experiment of the above-mentioned prior art requires a lot of time to place the electrodes, and it is also unable to specifically show the diffusion mode of water in the cracks. In addition, when placing the electrodes, the distance between the electrodes must be controlled. Therefore, a lot of energy and time are consumed when placing the electrodes. In addition, the device is unable to show how the water in the cracks diffuses in the soil. Utility Model Content

[0005] The utility model aims to provide a fixed electrode type water infiltration monitoring device in fissured soil to solve the problems existing in the above-mentioned prior art.

[0006] A fixed electrode type water infiltration monitoring device in fractured soil, comprising an organic glass container, the organic glass container is in a box-shaped structure and the top surface is transparent, the inner cavity of the organic glass container contains reshaped soil, the top surface of the reshaped soil is paved with an activated carbon adsorption layer, the reshaped soil is provided with prefabricated fractures, the top of the prefabricated fractures penetrates the activated carbon adsorption layer; the top surface of the activated carbon adsorption layer is paved with a plurality of electrode fixing plates, the electrode fixing plates are vertically penetrated with a plurality of electrode rods, and the tops of all the electrode rods are connected in sequence by cables.

[0007] Preferably, a first card slot is provided on one side of the top surface of the electrode fixing plate, and a second card slot is provided on the side of the bottom surface of the electrode fixing plate away from the first card slot, the second card slot has the same width as the first card slot and is parallel to each other; the distance from the first card slot to the nearest parallel side of the electrode fixing plate is smaller than the width of the second card slot; the distance from the second card slot to the nearest parallel side of the electrode fixing plate is smaller than the width of the first card slot.

[0008] Preferably, the electrode rod is in an overall long conical shape and the side wall is wrapped with an insulating sleeve.

[0009] The utility model discloses the following technical effects:

[0010] The utility model can save time for placing electrodes and improve the distance accuracy of electrode placement; it can vividly show the diffusion mode of water in cracks; in addition, the device is low in cost and can be used for two-dimensional high-density measurement and three-dimensional high-density measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 This is a side view of the internal structure of the utility model;

[0013] Figure 2 It is a front cross-sectional view of a single electrode fixing plate of the utility model;

[0014] Figure 3 It is an overall top view of the utility model.

[0015] in:

[0016] 1. Electrode rod; 2. Cable; 3. Isolation sleeve; 4. Organic glass container; 5. Fuchsin dyeing aqueous solution; 6. Electrode fixing plate; 7. First card slot; 8. Activated carbon adsorption layer; 9. Reshaped soil; 10. Prefabricated cracks; 11. Second card slot. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] See attached Figure 1-3 A fixed electrode type water infiltration monitoring device in a fissured soil body comprises an organic glass container 4, which is a box-shaped structure with a transparent top surface. A reshaped soil body 9 is contained in the inner cavity of the organic glass container 4, and an activated carbon adsorption layer 8 is laid on the top surface of the reshaped soil body 9. Prefabricated cracks 10 are opened in the reshaped soil body 9, and the top of the prefabricated cracks 10 penetrates the activated carbon adsorption layer 8; a plurality of electrode fixing plates 6 are laid on the top surface of the activated carbon adsorption layer 8, and a plurality of electrode rods 1 are vertically penetrated on the electrode fixing plates 6, and the tops of all electrode rods 1 are connected in sequence through cables 2.

[0020] The organic glass container 4 is transparent, which allows the experimenter to observe the internal soil infiltration. Before the experiment, it is necessary to open prefabricated cracks 10 on the activated carbon adsorption layer 8 and the reshaped soil body 9, and several electrode fixing plates 6 can be connected together end to end in sequence. The material of the electrode fixing plate 6 is water-permeable, and water can penetrate downward through the electrode fixing plate 6; a number of through holes with equal spacing are opened in advance on the electrode fixing plate 6, and the electrode rod 1 can be inserted into the through hole, and it is necessary to ensure that after the electrode rod 1 is inserted into the through hole, the bottom end of the electrode rod 1 can extend into the reshaped soil body 9. Because the through holes on the electrode fixing plate 6 are opened in advance, the experimenter does not need to measure the spacing when installing the electrode rod 1, and only needs to insert it into the through hole. This will improve the distance accuracy of the electrode placement, and also increase the placement speed and save time; the water used in the experiment is a fuchsin dyeing aqueous solution 5, which is convenient for observing the way water diffuses in the cracked soil.

[0021] A further optimized solution is that a first card slot 7 is provided on one side of the top surface of the electrode fixing plate 6, and a second card slot 11 is provided on the side of the bottom surface of the electrode fixing plate 6 away from the first card slot 7. The second card slot 11 has the same width as the first card slot 7 and is parallel to each other; the distance from the first card slot 7 to the nearest parallel side of the electrode fixing plate 6 is smaller than the width of the second card slot 11; the distance from the second card slot 11 to the nearest parallel side of the electrode fixing plate 6 is smaller than the width of the first card slot 7.

[0022] Both ends of the first card slot 7 and the second card slot 11 pass through the two opposite sides of the electrode fixing plate 6. The part from the first card slot 7 to the closest parallel side of the electrode fixing plate 6 can be inserted into the second card slot 11 on another electrode fixing plate 6. Similarly, the part from the second card slot 11 to the closest parallel side of the electrode fixing plate 6 can be inserted into the first card slot 7 of another electrode fixing plate 6. In this way, these electrode fixing plates 6 can be connected to each other to improve stability.

[0023] According to a further optimized solution, the electrode rod 1 is in an overall long conical shape and the side wall is wrapped with an insulating sleeve 3 .

[0024] The electrode rod 1 is wide at the top and pointed at the bottom, so that it can be more easily inserted into the reshaped soil 9. The through hole on the electrode fixing plate 6 for inserting the electrode rod 1 is also formed into an inverted frustum to adapt to the shape of the electrode rod 1 and determine the depth of the electrode rod 1 inserted into the reshaped soil 9. The insulating sleeve 3 can effectively protect the electrode rod 1, reduce the wear of the electrode rod 1 during the insertion process, and further improve the insulation effect.

[0025] When using the utility model, a reshaped soil body 9 is arranged in a plexiglass container 4 and a prefabricated fissure 10 is opened. Then, an activated carbon adsorption layer 8 is attached to the reshaped soil body 9. The top of the prefabricated fissure 10 needs to penetrate the activated carbon adsorption layer 8. The electrode fixing plate 6 is spliced ​​through the first card slot 7 and the second card slot 11 as required, and covered on the activated carbon adsorption layer 8. The electrode rod 1 with the isolation sleeve 3 is inserted into the reshaped soil body 9 through the through hole of the electrode fixing plate 6 as required, and a magenta dyeing aqueous solution 5 is injected into the top layer of the device. The electrode rods 1 are connected by a cable 2 and high-density electrical measurement is performed. The experiment is performed according to the basic working method of high-density electrical detection. At this time, the water in the prefabricated fissure 10 is The magenta dyed aqueous solution 5 penetrates downward through the electrode fixing plates 6 and the gaps therebetween, and then penetrates into the reshaped soil 9 after passing through the activated carbon adsorption layer 8. The water in the reshaped soil 9 far away from the prefabricated fissures 10 is the magenta dyed aqueous solution 5 adsorbed by the activated carbon adsorption layer 8, which is colorless water, while the water in the prefabricated fissures 10 is not adsorbed by the activated carbon adsorption layer 8 and still has color. Therefore, the diffusion characteristics of the water flow in the prefabricated fissures 10 can be identified through the organic glass container 4. The electrode fixing plate 6 based on the design that can conveniently and quickly arrange the electrode rods 1 can realize high-density electrical monitoring with a small electrode distance, which can accurately reveal the water infiltration characteristics in the reshaped soil 9 under the influence of the prefabricated fissures 10.

[0026] This utility model is supported by the National Natural Science Foundation Youth Fund Project; Project Number: 42207200; Project Leader: Zhao Kuanyao; Project Name: "Coupled Infiltration Mechanism of Predominant Flow and Matrix Flow in Fracture Soil of Loess Plateau Irrigation Area".

[0027] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A fixed electrode type water infiltration monitoring device in a fissured soil, characterized in that: include: An organic glass container (4) is in a box-shaped structure and has a transparent top surface. A reshaped soil (9) is contained in the inner cavity of the organic glass container (4). An activated carbon adsorption layer (8) is laid on the top surface of the reshaped soil (9). A prefabricated crack (10) is opened in the reshaped soil (9), and the top of the prefabricated crack (10) penetrates the activated carbon adsorption layer (8). A plurality of electrode fixing plates (6) are laid on the top surface of the activated carbon adsorption layer (8), and a plurality of electrode rods (1) are vertically penetrated on the electrode fixing plates (6). The tops of all the electrode rods (1) are connected in sequence through cables (2).

2. The fixed electrode type water infiltration monitoring device in fractured soil according to claim 1, characterized in that: A first card slot (7) is provided on one side of the top surface of the electrode fixing plate (6), and a second card slot (11) is provided on a side of the bottom surface of the electrode fixing plate (6) away from the first card slot (7); the second card slot (11) and the first card slot (7) have the same width and are parallel to each other; the distance from the first card slot (7) to the nearest parallel side surface of the electrode fixing plate (6) is less than the width of the second card slot (11); and the distance from the second card slot (11) to the nearest parallel side surface of the electrode fixing plate (6) is less than the width of the first card slot (7).

3. The fixed electrode type water infiltration monitoring device in fractured soil according to claim 1, characterized in that: The electrode rod (1) is in an overall long conical shape and its side wall is wrapped with an insulating sleeve (3).

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