An in-situ dispersed soil modification method and modification system based on electroosmosis principle

Abstract

The present invention discloses an in-situ dispersive soil modification method and modification system based on the electroosmosis principle, wherein the modification system comprises a conductive tube, a drainage pipeline, a pump body and a DC power supply, wherein: the conductive tube comprises an anode conductive tube and a cathode conductive tube, both of which are closed at one end and open at the other end, and a plurality of through holes are provided on the tube body; the drainage pipeline comprises an anode drainage branch pipe, an anode drainage main pipe, a cathode drainage branch pipe and a cathode drainage main pipe; the open end of the anode conductive tube and the open end of the cathode conductive tube are respectively connected to the anode drainage branch pipe and the cathode drainage branch pipe; the pump body comprises an anode pump body and a cathode pump body; they are respectively connected to the anode drainage main pipe and the cathode drainage main pipe; the positive pole of the DC power supply is connected to the anode conductive tube, and the negative pole is connected to the cathode conductive tube. The in-situ dispersive soil modification method based on the electroosmosis principle provided by the present invention can more comprehensively improve the dispersibility of the soil body and avoid the phenomenon of uneven modification.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and in particular to an in-situ dispersed soil modification method and modification system based on the electroosmosis principle. Background Art

[0002] Dispersed soil is one of the special soil types that has attracted much attention in the geotechnical engineering community in recent years. In low-salinity water or pure water, the cohesion between fine particles is mostly or even completely lost, and the particles that exist in agglomerates disperse themselves into primary particles. Engineering practice shows that the anti-erosion ability of dispersed soil is very low, which can easily cause engineering accidents such as dam pipe bursts and roadbed instability, so it is extremely harmful. Dams or water-retaining structures are damaged due to the use of dispersed soil.

[0003] Clay particles undergo isomorphous substitution due to their own structural composition (Al 3+ Replacement of Si 4 + or Mg 2+ Al 3+ The crystal shape remains basically unchanged, but the charge in the crystal is unbalanced, resulting in residual negative charge, so cations need to be adsorbed to balance the charge. The surface of clay particles will adsorb cations, which are attracted by the negative charge on the surface of the clay particles. At the same time, due to their own thermal motion, they leave the interface and diffuse into the medium environment. The two balance each other so that the cations are distributed in a balanced diffusion outside the surface of the clay particles, forming a diffuse double layer. The concentration of cations is the largest at the surface of the clay particles, and is distributed decreasingly along the surface of the clay particles, and finally equals the ion concentration in the medium environment.

[0004] The study found that the dispersion mechanism of dispersed soil is mainly due to the presence of more sodium ions in the soil and the strong alkalinity of the soil. In essence, this can be reflected by the thickness of the double layer. According to the double layer theory, the thickness of the double layer is inversely proportional to the ion valence, that is, the higher the ion valence, the thinner the double layer thickness. When clay particles adsorb monovalent sodium ions, the thickness of their double layer is thicker than that of clay particles adsorbing divalent calcium ions, which in turn manifests as increased dispersion. At the same time, the greater the soil pH, the greater the OH - The higher the content, the - It adsorbs onto clay particles and reacts with the hydroxyl groups on the surface or edge of the particles, reducing the Zeta potential and adsorbing more cations, which increases the thickness of the double electric layer on the particle surface. The increase in repulsion between particles makes the particles tend to disperse, showing enhanced dispersibility.

[0005] The exchange capacity of exchangeable cations increases with the increase of atomic valence and bond strength. Therefore, the order of strength of common cation exchange capacity is: Fe 3+ >Al3+ >Ca 2+ >Mg 2+ >NH 4+ >K + >Na + >Li + Under the same conditions of concentration, temperature and other factors, the double layer thickness of monovalent sodium ions is twice that of divalent calcium ions and magnesium ions, and three times that of trivalent aluminum ions. 2+ , Ca 2+ and Al 3+ Due to the replacement of cations, the double electrical layer thickness of soil particles can be thinned, and particles can be condensed, effectively reducing the dispersion of the soil.

[0006] At present, the method of adding modifiers is generally used in engineering to improve the dispersibility of soil. Due to the limitations of on-site construction conditions, it is difficult for the soil and modifier to fully mix and react, resulting in the dispersion modification results often not being uniform, and there will still be some dispersed soil residues. In addition, there is also a method of in-situ injection of liquid into the soil to improve the dispersibility of soil, but due to the limited penetration range of the modified liquid and the gradual deterioration of the permeability of the modified liquid as the soil compaction density increases, this in-situ injection method has limited effect in practical applications. Summary of the invention

[0007] The first purpose of the present invention is to provide an in-situ dispersible soil modification method based on the principle of electroosmosis, which can greatly promote the permeability of the modified liquid, thereby more comprehensively improving the dispersion of the soil and avoiding the phenomenon of uneven modification; at the same time, due to the soil reinforcement effect of the electroosmosis method itself, the dispersion of the soil is further reduced.

[0008] The second object of the present invention is to provide an in-situ dispersed soil modification system based on the principle of electroosmosis.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0010] The first aspect of the present invention provides an in-situ dispersed soil modification system based on the electroosmosis principle, comprising:

[0011] Conductive tube; the conductive tube includes an anode conductive tube and a cathode conductive tube, the anode conductive tube and the cathode conductive tube are both closed at one end and open at the other end, and a plurality of through holes are provided on the tube body of the anode conductive tube and the cathode conductive tube;

[0012] Drainage pipeline; the drainage pipeline includes an anode drainage branch pipe, an anode drainage main pipe, a cathode drainage branch pipe and a cathode drainage main pipe; the open end of the anode conductive pipe is connected to the anode drainage branch pipe, and the anode drainage branch pipe is further connected to the anode drainage main pipe; the open end of the cathode conductive pipe is connected to the cathode drainage branch pipe, and the cathode drainage branch pipe is further connected to the cathode drainage main pipe;

[0013] A pump body, comprising an anode pump body and a cathode pump body; the anode pump body and the cathode pump body are connected to the anode drainage main pipe and the cathode drainage main pipe respectively; and

[0014] A direct current power supply; the positive electrode of the direct current power supply is connected to the anode conductive tube, and the negative electrode of the direct current power supply is connected to the cathode conductive tube.

[0015] Furthermore, the conductive tube satisfies at least one of the following conditions:

[0016] a. The closed end of the conductive tube is provided with a conical drill bit;

[0017] b. The conductive tube is a steel tube;

[0018] c. The outer diameter of the conductive tube is 30 to 50 mm and the wall thickness is 2 to 5 mm;

[0019] d. The aperture of the through hole is 5 to 10 mm;

[0020] f. A portion of the conductive tube close to the closed end is wrapped with a conductive filter cloth, and the conductive filter cloth at least covers a portion of the through hole.

[0021] Further, the drainage pipe is a plastic pipe; and / or,

[0022] The open end of the anode conductive tube and the open end of the cathode conductive tube are both connected to the anode drainage branch pipe and the cathode drainage branch pipe through a hose and a pipe joint.

[0023] Furthermore, the number of the anode conductive tubes and the cathode conductive tubes are both m×n, and the number of the anode drainage branch pipes and the cathode drainage branch pipes are both n; wherein:

[0024] m,n≥1; every m anode conductive tubes are connected to an anode drainage branch pipe, and every m cathode conductive tubes are connected to a cathode drainage branch pipe; the n anode drainage branch pipes and the n cathode drainage branch pipes are respectively connected to an anode drainage main pipe and a cathode drainage main pipe.

[0025] The second aspect of the present invention provides an in-situ dispersive soil modification method based on the electroosmosis principle, comprising the following steps:

[0026] S1. Drilling m×2n boreholes on the surface of the land to be processed, wherein the m×2n boreholes are arranged into an m×2n matrix, where m, n≥1;

[0027] S2. Provide m×n anode conductive tubes and m×n cathode conductive tubes, wherein the anode conductive tubes and the cathode conductive tubes are both closed at one end and open at the other end, and the tube bodies of the anode conductive tubes and the cathode conductive tubes are both provided with a plurality of through holes; insert the anode conductive tubes and the cathode conductive tubes into the m×2n drill holes correspondingly, and make the open ends exposed to the surface; the anode conductive tubes and the cathode conductive tubes are arranged in n columns, and the n columns of anode conductive tubes and the n columns of cathode conductive tubes are arranged alternately with each other;

[0028] S3. Provide n anode drainage branch pipes and n cathode drainage branch pipes, connect the open ends of n columns of anode conductive tubes to the n anode drainage branch pipes, respectively, and connect the open ends of n columns of cathode conductive tubes to the n cathode drainage branch pipes; connect the n anode drainage branch pipes to an anode drainage main pipe, and connect the n cathode drainage branch pipes to a cathode drainage main pipe; then connect the anode drainage main pipe to the anode pump body, and connect the cathode drainage main pipe to the cathode pump body;

[0029] S4. Connect m×n anode conductive tubes in series and connect them to the positive electrode of a DC power supply; connect m×n cathode conductive tubes in series and connect them to the negative electrode of a DC power supply;

[0030] S5. Turn on the DC power supply to perform electroosmosis treatment, and use the anode pump to pump the modified liquid into the anode drainage main pipe, and use the cathode pump to extract Na-containing liquid from the plot. + Waste liquid.

[0031] Further, in step S2, the conductive tube satisfies at least one of the following conditions:

[0032] a. The closed end of the conductive tube is provided with a conical drill bit;

[0033] b. The conductive tube is a steel tube;

[0034] c. The outer diameter of the conductive tube is 30 to 50 mm and the wall thickness is 2 to 5 mm;

[0035] d. The aperture of the through hole is 5 to 10 mm;

[0036] f. A portion of the conductive tube close to the closed end is wrapped with a conductive filter cloth, and the conductive filter cloth at least covers a portion of the through hole.

[0037] Furthermore, in step S2, the height of the conductive tube exposed above the ground is 0.2-0.5 m; and / or,

[0038] The conductive tube body exposed to the ground at least includes a portion of through holes.

[0039] Furthermore, in step S5, the modifying liquid contains a dispersible modifier, and the dispersible modifier includes at least one of AlCl3 and CaCl2.

[0040] Furthermore, in step S5, during the electroosmosis treatment, intermittent power supply is adopted, with power supply for 8 to 10 hours and rest for 2 to 4 hours; then the positive and negative poles of the DC power supply are swapped and the electroosmosis treatment is continued.

[0041] Furthermore, step S5 further includes: detecting the Na-containing + Na in wastewater + When the content of Na + When the content is lower than the safe value, stop the electroosmosis treatment.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention combines electroosmosis with dispersive soil modification, and realizes the controllable directional movement and reaction of the dispersive modifier in the soil through electroosmosis, which greatly improves the efficiency and effect of dispersive soil modification. Compared with conventional dispersive soil modification technology, in addition to dispersive soil modification, electroosmosis also effectively improves the soil strength near the anode. The modification method of the present invention not only has simple construction process, strong operability, but also has significant dispersive modification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic structural diagram of a conductive tube in an embodiment of the present invention;

[0045] Figure 2 It is a schematic diagram of the arrangement of the anode conductive tube and the cathode conductive tube and their connection with the drainage branch pipe;

[0046] Figure 3 is a schematic diagram of the arrangement of a drainage pipe in an embodiment of the present invention;

[0047] Among them: 1. Conductive pipe; 2. Drainage hole; 3. Conductive filter cloth; 4. Exhaust hole; 5. Conical drill bit; 6. Anode conductive pipe; 7. Cathode conductive pipe; 8. Hose; 9. Pipe fitting; 10. Drainage branch pipe; 11. Cable; 12. Backfill soil; 13. Anode drainage branch pipe; 14. Cathode drainage branch pipe; 15. Anode drainage main pipe; 16. Cathode drainage main pipe. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and embodiments of the present invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0050] As described in the background technology, the method of adding a modifier is generally used in current projects to improve the dispersibility of soil. Due to the limitations of on-site construction conditions, it is difficult for the soil and the modifier to fully mix and react, resulting in the dispersion modification results often being not uniform enough, and some dispersed soil residues still exist. In addition, there is also a method of in-situ injection of liquid into the soil to improve the dispersibility of soil, but due to the limited penetration range of the modified liquid, and as the soil compaction density increases, the permeability of the modified liquid gradually deteriorates, so this in-situ injection method has limited effect in practical applications.

[0051] In view of various problems of dispersive soil modification, the present invention provides an in-situ dispersive soil modification method based on the electroosmosis principle.

[0052] Electroosmosis is a soft foundation reinforcement method that inserts positive and negative electrodes into the foundation and passes low-voltage direct current to improve the strength of soft clay by generating an electrokinetic effect. Under the action of the direct current field, the polar water molecules with cations in the soil pores will flow from the anode to the cathode to form electroosmosis, while the negatively charged soil particles will move toward the anode to form electrophoresis. The soil particles are deposited near the anode, making the soil near the anode denser and increasing its strength. If dispersible modifiers such as AlCl3 and CaCl2 are added to the anode, they will be transported from the anode to the cathode by electroosmosis, and the soil along the way will be modified, thereby achieving the purpose of overall soil modification. Compared with traditional modification methods, this method can improve the dispersibility of the soil more comprehensively and avoid the phenomenon of uneven modification. At the same time, due to the soil reinforcement effect of the electroosmosis method itself, the dispersibility of the soil is further reduced.

[0053] Specifically, the in-situ dispersive soil modification method based on the electroosmosis principle provided by the present invention comprises the following steps:

[0054] S1. Drilling m×2n boreholes on the surface of the land to be processed, wherein the m×2n boreholes are arranged into an m×2n matrix, where m, n≥1;

[0055] S2. Provide m×n anode conductive tubes 6 and m×n cathode conductive tubes 7, wherein the anode conductive tubes 6 and the cathode conductive tubes 7 are both closed at one end and open at the other end, and a plurality of through holes are provided on the tube bodies of the anode conductive tubes 6 and the cathode conductive tubes 7; insert the anode conductive tubes 6 and the cathode conductive tubes 7 into the m×2n drill holes correspondingly, and make the open ends exposed to the surface; the anode conductive tubes 6 and the cathode conductive tubes 7 are arranged in n rows, and the n rows of anode conductive tubes 6 and the n rows of cathode conductive tubes 7 are arranged alternately with each other;

[0056] S3. Provide n anode drainage branch pipes 13 and n cathode drainage branch pipes 14, connect the open ends of n columns of anode conductive tubes 6 to the n anode drainage branch pipes 13, and connect the open ends of n columns of cathode conductive tubes 7 to the n cathode drainage branch pipes 14; connect the n anode drainage branch pipes 13 to an anode drainage main pipe 15, and connect the n cathode drainage branch pipes 14 to a cathode drainage main pipe 16; then connect the anode drainage main pipe 15 to the anode pump body, and connect the cathode drainage main pipe 16 to the cathode pump body;

[0057] S4. Connect m×n anode conductive tubes 6 in series and connect them to the positive electrode of the DC power supply; connect m×n cathode conductive tubes 7 in series and connect them to the negative electrode of the DC power supply;

[0058] S5. Turn on the DC power supply to perform electroosmosis treatment, and use the anode pump to pump the modified liquid into the anode drainage main pipe 15, and use the cathode pump to extract Na-containing liquid from the plot. + Waste liquid.

[0059] In the above step S1, the soil block to be treated refers to a plot containing dispersed soil and requiring dispersed modification. Before drilling, the plot is preferably cleared and backfilled. The borehole diameter needs to be adapted to the conductive tube 1 so as to facilitate the insertion of the conductive tube 1 into the borehole. The boreholes are preferably arranged in a matrix, and the number of boreholes can be determined according to the size of the plot to be treated, for example, 20×20, 20×50, 50×100, 100×100, 100×200, 200×500, and the like.

[0060] In the above step S2, the structure of the conductive tube 1 is as shown in the attached figure. Figure 1 The conductive tube 1 is divided into two types: an anode conductive tube 6 and a cathode conductive tube 7. They have the same structure, one end of which is closed and the other end is open. A plurality of through holes are provided on the tube bodies of the anode conductive tube 6 and the cathode conductive tube 7. The closed end of the conductive tube 1 is preferably provided with a drill bit, for example Figure 1 The conical drill bit 5 in the drill bit is convenient for insertion into the borehole on the ground.

[0061] In a preferred embodiment, the through holes include two types, one is a drainage hole 2, which is located on the tube body of the conductive tube 1 near the closed end; the other is an exhaust hole 4, which is located on the tube body of the conductive tube 1 near the open end. When the conductive tube 1 is inserted into the drill hole, the drainage hole 2 is located below the clay, and the exhaust hole 4 is located above the ground surface.

[0062] The function of the drainage hole 2 is to allow the modified liquid in the anode conductive tube 6 to penetrate into the soil and make the Na + The waste liquid is sucked into the cathode conductive tube 7. In a preferred embodiment, a filter cloth is wrapped on the part of the conductive tube 1 near the closed end, and the filter cloth covers the drainage hole 2. The purpose of setting the filter cloth is to prevent soil particles from blocking the drainage hole 2 during the burial of the conductive tube 1 and the construction process, and to prevent soil particles from being drawn out when the cathode conductive tube 7 is drained, causing blockage. Furthermore, in order to prevent the filter cloth attached to the surface of the conductive tube 1 from affecting the electroosmosis of the electrode in the soil, it is preferred to use a conductive filter cloth 3 to reduce its influence on the electroosmosis efficiency.

[0063] During the electroosmosis process, gas will be generated by electrolysis around the electrodes. By providing an exhaust hole 4 on the pipe body above the ground surface, the gas generated by the reaction can be discharged in time, thereby increasing the efficiency of the electroosmosis.

[0064] The diameters of the drainage holes 2 and the vent holes 4 can be 5 to 10 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc. The drainage holes 2 are preferably evenly distributed on the circumference of the tube body, so that the modified liquid can evenly penetrate into the soil, and the surrounding soil containing Na + The waste liquid is evenly sucked into the cathode conductive tube 7.

[0065] The outer diameter of the conductive tube 1 may be 30-50 mm, such as 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, etc. The wall thickness may be 2-5 mm, such as 2 mm, 3 mm, 4 mm, 5 mm, etc. In a preferred embodiment, the conductive tube 1 is a steel flower tube.

[0066] When inserting the conductive tube 1 into the borehole, the insertion depth can be selected according to the distribution position of the dispersed soil sample in the soil body. Conventional dispersed soil is mostly concentrated in the shallow surface. Therefore, it is only necessary to insert the conductive tube 1 into the dispersed soil in the soil body. The height of the conductive tube 1 exposed to the surface can generally be set to 0.2 to 0.5m, for example, 0.2m, 0.3m, 0.4m, 0.5m, etc.

[0067] As attached Figure 2As shown, in the present invention, the boreholes are arranged in a matrix, and when the anode conductive tubes 6 and the cathode conductive tubes 7 are inserted, the anode conductive tubes 6 and the cathode conductive tubes 7 are arranged in n columns, and the n columns of anode conductive tubes 6 and the n columns of cathode conductive tubes 7 are arranged alternately. The advantage of such an arrangement is that during the subsequent electroosmosis treatment, the dispersibility modifier in the anode conductive tubes 6 can react evenly and thoroughly in the soil, which is conducive to improving the dispersibility modification effect of the soil.

[0068] like Figure 2-3 As shown, in the above step S3, when arranging the anode drainage branch pipe 13 and the cathode drainage branch pipe 14, each column of anode conductive tubes 6 is correspondingly arranged with an anode drainage branch pipe 13, and each column of cathode conductive tubes 7 is correspondingly arranged with a cathode drainage branch pipe 14. Specifically, the open ends of the m anode conductive tubes 6 in each column are connected to the corresponding anode drainage branch pipe 13, and the open ends of the m cathode conductive tubes 7 in each column are connected to the corresponding cathode drainage branch pipe 14. Then, the n anode drainage branch pipes 13 are connected to an anode drainage main pipe 15, and the n cathode drainage branch pipes 14 are connected to a cathode drainage main pipe 16. All drainage pipes can be plastic pipes, such as PVC pipes.

[0069] There is no limitation on the connection method between the conductive pipe 1 and the drainage branch pipe 10. For example, a hose 8 and a pipe joint 9 can be used for connection (see attached). Figure 1 ). Similarly, the drainage branch pipe 10 and the drainage main pipe can also be connected by a pipe joint 9.

[0070] After the drainage pipes are connected, the anode drainage main pipe 15 is connected to the anode pump body, and the cathode drainage main pipe 16 is connected to the cathode drainage main pipe 16. Both the anode pump body and the cathode pump body can adopt jet pumps.

[0071] In the above step S4, all the anode conductive tubes 6 are connected in series by using the cable 11 and connected to the positive electrode of the DC power supply; all the cathode conductive tubes 7 are connected in series and connected to the negative electrode of the DC power supply.

[0072] In the above step S5, when the power is turned on, a DC electric field is formed between each anode conductive tube 6 and the corresponding cathode conductive tube 7. Then, the anode pump body and the cathode pump body are started. The anode pump body pumps the modified liquid into the anode drainage main pipe 15, and the modified liquid enters each anode conductive tube 6 through the anode drainage branch pipe 13, and finally penetrates into the dispersed soil through the drainage hole 2 on the pipe body. Among them, the modified liquid contains a dispersible modifier, and the dispersible modifier includes but is not limited to at least one of AlCl3, CaCl2, etc. Under the action of electroosmosis, the cationic Al in the dispersible modifier is 3+ , Ca 2+ It moves toward the cathode conductive tube 7 and interacts with the Na +A replacement reaction occurs, replacing it, thereby reducing the thickness of the double electric layer on the surface of the clay particles and reducing the dispersion. At the same time, through the suction action of the cathode pump body, the cathode conductive tube 7 removes the replaced Na + The solution is extracted in sequence through the cathode conductive pipe 7, the cathode drainage branch pipe 14 and the cathode drainage main pipe 16, thereby avoiding secondary dispersion of the soil.

[0073] In the preferred embodiment, in order to ensure the construction quality and to reinforce the soil at all locations, the electroosmosis treatment is carried out by intermittent alternating power supply, with each power supply being 8 to 10 hours and then resting for 2 to 4 hours. Then the positive and negative poles of the DC power supply are swapped, that is, the original anode becomes the cathode, and the modified liquid is pumped in and then the Na-containing liquid is pumped out. + Waste liquid; the original cathode becomes the anode, and the Na + The waste liquid becomes the pumped-in modifying liquid.

[0074] Furthermore, during the electroosmotic treatment, the pumped Na + The waste liquid was tested to determine the Na + When Na + When the content is lower than the safe value, stop the electroosmosis treatment; when Na + When the content is higher than the safety value, continue the electro-osmosis treatment. The safety value can be measured by the identification test of the dispersed soil.

[0075] Furthermore, after the electro-osmosis is completed, the construction site is cleaned, the drainage pipes and cables 11 are removed, and the conductive tube 1 is pulled out for reuse.

[0076] In summary, the present invention provides an in-situ dispersive soil modification method based on the principle of electroosmosis, which can improve the dispersibility of the soil more comprehensively and avoid the phenomenon of uneven modification; at the same time, due to the soil reinforcement effect of the electroosmosis method itself, the dispersibility of the soil is further reduced. The in-situ dispersive soil modification method provided by the present invention is expected to be used to solve the engineering construction problem of damage to dam bodies or water retaining structures caused by the presence of dispersive soil.

[0077] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. An in-situ dispersed soil modification system based on the principle of electroosmosis, characterized in that: include: Conductive tube; The conductive tube comprises an anode conductive tube and a cathode conductive tube, each of which is closed at one end and open at the other end, and a plurality of through holes are provided on the tube body of the anode conductive tube and the cathode conductive tube; a conductive filter cloth is wrapped on a portion of the tube body of the conductive tube close to the closed end, and the conductive filter cloth at least covers a portion of the through holes; one end of the conductive tube is exposed to the ground, and the exposed tube body includes at least a portion of the through holes; Drainage pipeline; the drainage pipeline includes an anode drainage branch pipe, an anode drainage main pipe, a cathode drainage branch pipe and a cathode drainage main pipe; the open end of the anode conductive pipe is connected to the anode drainage branch pipe, and the anode drainage branch pipe is further connected to the anode drainage main pipe; the open end of the cathode conductive pipe is connected to the cathode drainage branch pipe, and the cathode drainage branch pipe is further connected to the cathode drainage main pipe; The pump body comprises an anode pump body and a cathode pump body; the anode pump body and the cathode pump body are respectively connected to the anode drainage main pipe and the cathode drainage main pipe; the cathode pump body is used to extract Na-containing water from the land. + Wastewater; A DC power supply; the positive electrode of the DC power supply is connected to the anode conductive tube, and the negative electrode of the DC power supply is connected to the cathode conductive tube; and A modified liquid, wherein the modified liquid contains a dispersible modifier, and the dispersible modifier includes at least one of AlCl3 and CaCl2; the modified liquid is pumped into the anode drainage main pipe through the anode pump body; Among them, the number of the anode conductive tubes and the cathode conductive tubes are both m×n, and the number of the anode drainage branch pipes and the cathode drainage branch pipes are both n; wherein: m, n≥1; every m anode conductive tubes are connected to an anode drainage branch pipe, and every m cathode conductive tubes are connected to a cathode drainage branch pipe; the n anode drainage branch pipes and the n cathode drainage branch pipes are respectively connected to an anode drainage main pipe and a cathode drainage main pipe.

2. The in-situ dispersed soil modification system based on the electroosmosis principle according to claim 1 is characterized in that: The conductive tube meets at least one of the following conditions: a. The closed end of the conductive tube is provided with a conical drill bit; b. The conductive tube is a steel tube; c. The outer diameter of the conductive tube is 30 to 50 mm and the wall thickness is 2 to 5 mm; d. The diameter of the through hole is 5 to 10 mm.

3. The in-situ dispersed soil modification system based on the electroosmosis principle according to claim 1 is characterized in that: The drainage pipe is a plastic pipe; and / or, The open end of the anode conductive tube and the open end of the cathode conductive tube are both connected to the anode drainage branch pipe and the cathode drainage branch pipe through a hose and a pipe joint.

4. An in-situ dispersive soil modification method based on the principle of electroosmosis, characterized in that: The in-situ dispersed soil modification method adopts the in-situ dispersed soil modification system based on the electroosmosis principle as described in any one of claims 1 to 3, and comprises the following steps: S1. Drilling m×2n boreholes on the surface of the land to be processed, wherein the m×2n boreholes are arranged into an m×2n matrix, where m, n≥1; S2. inserting the anode conductive tube and the cathode conductive tube into the m×2n boreholes respectively, with the open ends exposed to the surface, and the exposed tube bodies of the conductive tubes at least include a portion of through holes; the anode conductive tubes and the cathode conductive tubes are arranged in n columns, and the n columns of anode conductive tubes and the n columns of cathode conductive tubes are arranged alternately with each other; S3. Connect the open ends of n rows of anode conductive tubes to n anode drainage branch pipes, respectively, and connect the open ends of n rows of cathode conductive tubes to n cathode drainage branch pipes, respectively; and connect the n anode drainage branch pipes to an anode drainage main pipe, and connect the n cathode drainage branch pipes to a cathode drainage main pipe; and then connect the anode drainage main pipe to the anode pump body, and connect the cathode drainage main pipe to the cathode pump body; S4. Connect m×n anode conductive tubes in series and connect them to the positive electrode of a DC power supply; connect m×n cathode conductive tubes in series and connect them to the negative electrode of a DC power supply; S5. Turn on the DC power supply to perform electroosmosis treatment, and use the anode pump to pump the modified liquid into the anode drainage main pipe, and use the cathode pump to extract Na-containing liquid from the plot. + Waste liquid; the modified liquid contains a dispersible modifier, and the dispersible modifier includes at least one of AlCl3 and CaCl2.

5. The in-situ dispersive soil modification method based on the electroosmosis principle according to claim 4, characterized in that: In step S2, the height of the conductive tube exposed above the ground is 0.2-0.5 m.

6. The in-situ dispersive soil modification method based on the electroosmosis principle according to claim 4, characterized in that: In step S5, during the electroosmosis treatment, intermittent power supply is adopted, with power supply for 8 to 10 hours and rest for 2 to 4 hours; then the positive and negative poles of the DC power supply are swapped and the electroosmosis treatment is continued.

7. The in-situ dispersive soil modification method based on the electroosmosis principle according to claim 4, characterized in that: In step S5, it also includes: detecting the Na-containing + Na in wastewater + When the content of Na + When the content is lower than the safe value, stop the electroosmosis treatment.

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