Composite material bagged sand well electrode for combined electroosmosis and pre-pressing

Abstract

The invention discloses a composite material bagged sand well electrode for combined electro-osmosis and pre-pressing, belongs to the technical field of soft soil foundation treatment by an electro-osmosis method, and solves the problem that an electrode is easy to corrode or poor in conductivity when a foundation is treated by an electro-osmosis method in the prior art. The device specifically comprises a conductive sand bag and a sand column, wherein the sand column is filled in the conductive sand bag; the conductive sand bag is made of a composite graphite material, the resistivity of the material is low, the conductivity of the material is superior to that of EKG conductive plastic, and the material has extremely high corrosion resistance and flexibility. According to the composite bagged sand well electrode, the conductive sand bag is filled with the sand columns to form the composite bagged sand well electrode, and the composite bagged sand well electrode integrates the functions of an electrode and a bagged sand well; the composite material bagged sand well electrode is inserted into a soft soil foundation, can be used as an electrode to play a conductive role, and can also be directly used as a bagged sand well of a vertical drainage body.

Description

Technical Field

[0001] The invention relates to the technical field of treating soft soil foundation by electroosmosis, and in particular to a composite material bagged sand well electrode for combined electroosmosis and pre-pressing. Background Art

[0002] Electroosmosis is a method for treating soft soil foundations. It uses the principle of electroosmosis to accelerate the drainage and consolidation process of the soil, thereby improving the strength and stability of the foundation and providing important technical support for various civil engineering projects. The principle of electroosmosis is to insert metal electrodes into the soil and pass direct current, so that the water in the soil flows from the anode to the cathode, thereby accelerating the drainage and consolidation process of the soil. This method is particularly suitable for treating fine-grained soft clay foundations with high water content and low permeability, and can significantly improve the strength and stability of the foundation. When the electroosmosis method treats soft soil foundations, water will flow in a directional manner under the action of electric current, especially free water and ions in the pores of the soil; this method can effectively reduce the water content of the soil, while improving the physical and chemical properties of the soil and improving its engineering performance. Vacuum preloading is also a common method for consolidating soft soil foundations. It mainly applies vacuum on the foundation surface to reduce the excess pore water pressure and promote soil consolidation; vacuum preloading can increase the effective stress of the soil, thereby improving the bearing capacity of the soil. Therefore, the electroosmosis method combined with the vacuum preloading method can often achieve good drainage and consolidation effects on soft soil foundations.

[0003] In the process of electroosmosis treatment of soft soil foundation, the electrode is a key component. It not only plays a conductive role, but also involves the drainage and reinforcement effect of the soil body; the design and material selection of the electrode have a significant impact on the electroosmosis effect. In the prior art, when the electroosmosis method is used to treat soft soil foundation, metal electrodes are usually inserted into the soft soil foundation as anodes and cathodes; the electrodes are energized by a DC power supply, so that the moisture in the soil flows from the anode to the cathode under the action of the electric field; and a water filter pipe is designed near the electrode of the cathode to collect the discharged moisture by vacuum pumping. Common electrode materials in the prior art mainly include metal materials such as iron, copper, and aluminum, electronic conductors such as graphite, and electric geosynthetics (EKG conductive plastics); metal electrodes are easily corroded during the electroosmosis process, resulting in serious loss of electrode materials; inert electrodes such as EKG conductive plastics have good corrosion resistance, but their conductivity is not excellent enough.

[0004] Therefore, the present invention provides a composite material electrode that is corrosion-resistant and has excellent electrical conductivity. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a composite material bagged sand well electrode for combined electroosmosis and pre-compression, which solves the problem of poor electrode conductivity when treating foundations by electroosmosis in the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A composite material bagged sand well electrode for combined electroosmosis and pre-pressing comprises a conductive sand bag with sand columns filled inside.

[0008] In this scheme, conductive sand bags are used to fill sand columns to form composite material bagged sand well electrodes. The composite material bagged sand well electrodes adopt an integrated structural design, integrating the functions of composite conductive material electrodes and bagged sand wells. The composite material bagged sand well electrodes are inserted into the inside of soft soil foundations, which can not only act as electrodes for conductivity, but can also be directly used as bagged sand wells for vertical drainage bodies.

[0009] Furthermore, the conductive sand bag includes a woven bag, and the sand column is filled in the woven bag; a layer of composite geoconductive cloth is provided on the outside of the woven bag; a plurality of graphite metal composite conductors are provided between the woven bag and the composite geoconductive cloth; and upper and lower binding ends are respectively fixed at both ends of the composite geoconductive cloth.

[0010] In this scheme, the composite geoconductive fabric wraps the woven bag and sand column on the outermost side, with the largest cross-sectional area, small overall resistance and excellent conductive performance. In addition, the designed composite geoconductive fabric has the largest contact area with the surrounding soil, and can conduct electricity well with the surrounding soil and moisture.

[0011] Furthermore, the graphite metal composite conductor includes a polyester wire, around which a plurality of copper wires are woven by a braiding machine; a layer of composite geoconductive fabric is wrapped around the plurality of copper wires; and the gap between the copper wires and the composite geoconductive fabric is filled with graphite conductive glue.

[0012] In this scheme, polyester wire and copper wire are woven together by a weaving machine and then embedded between the woven bag and the composite geoconductive fabric. The copper wire can greatly improve the conductive efficiency of the electrode; the role of the polyester wire is to improve the tensile strength of the graphite metal composite conductor to avoid it being broken during sand filling, transportation and construction operations.

[0013] Furthermore, the constituent materials of the composite geoconductive fabric include, by weight: 70 parts of expanded graphite, 8 parts of aluminum powder, 5 parts of antimony tin oxide, 15 parts of glass fiber, 10 parts of epoxy resin and 3 parts of carbonizing agent.

[0014] Furthermore, the conductive sand bag is a bag body formed by interlacing and weaving a number of resin flat wires, and a composite geotechnical conductive flat wire is arranged every several resin flat wires along the length direction of the bag body; sand columns are filled in the bag body; upper and lower binding openings are fixed at both ends of the bag body respectively.

[0015] In this solution, resin flat wires and composite geotechnical conductive flat wires are woven into conductive sand bags. This weaving design does not reduce the radial water permeability of the stratum to the sand well, ensuring that moisture in the soil can flow into the composite bag sand well electrode.

[0016] Furthermore, the composite geotechnical conductive flat wire includes a composite graphite flat belt, which is a hollow double-layer structure; a single-layer flat rope woven from nylon wire and copper wire is arranged between the double-layer structure, and the gap between the single-layer braided rope and the composite graphite flat belt is filled with graphite conductive glue.

[0017] In this scheme, copper wire is added to the composite geoconductive flat wire, which has better conductive properties than pure composite geoconductive fabric.

[0018] Furthermore, the constituent materials of the composite graphite flat strip include, by weight: 60 parts of expanded graphite, 5 parts of aluminum powder, 5 parts of antimony tin oxide, 25 parts of glass fiber, 12 parts of epoxy resin and 2 parts of carbonizing agent.

[0019] Furthermore, the conductive sand bag includes a woven bag, and the sand column is filled in the woven bag; a plurality of graphite metal composite conductive flat strips are distributed circumferentially on the outer side of the woven bag, and the plurality of graphite metal composite conductive flat strips are tied to the woven bag by cable ties; upper and lower binding ends are fixed at both ends of the woven bag and the graphite metal composite conductive flat strips.

[0020] In this solution, several graphite metal composite conductive flat strips are directly fixed to the outside of the woven bag by cable ties, which has a simple structure, reduces the difficulty of processing technology, and is easy to implement; several graphite metal composite conductive flat strips are equidistantly arranged on the outer periphery of the woven bag, which does not affect the overall water permeability of the sandbag.

[0021] Furthermore, the graphite metal composite conductive flat strip comprises a composite graphite flat strip, which is a hollow double-layer structure; a plurality of conductors woven from polyester wire and copper wire are arranged side by side between the double-layer structures, and graphite conductive glue is filled between the plurality of conductors and the composite graphite flat strip.

[0022] In this solution, braided polyester wire and copper wire are designed inside the composite graphite flat strip, which increases the thickness and cross-sectional area of ​​the graphite metal composite conductive flat strip and reduces the resistivity; at the same time, the copper wire inside the composite graphite flat strip can improve the conductive performance of the graphite metal composite conductive flat strip.

[0023] Furthermore, the constituent materials of the composite graphite flat strip include, by weight: 65 parts of expanded graphite, 8 parts of aluminum powder, 10 parts of antimony tin oxide, 15 parts of glass fiber, 10 parts of epoxy resin and 3 parts of carbon forming agent.

[0024] The beneficial effects of the present invention are:

[0025] The composite material bagged sand well electrode for combined electroosmosis and pre-pressing of the present invention uses conductive sand bags to fill sand columns, and has both conductive and drainage functions, and realizes the integration of electrodes and drainage bodies compared to existing metal electrodes; during construction, the two construction processes of installing bagged sand wells and installing electrodes can be combined into one, and one-time construction improves construction speed and reduces engineering costs; after the electrode and the drainage body are integrated, a more flexible planar layout can be carried out; the electrode is closer to the drainage body, which speeds up cathode drainage.

[0026] The conductive sand bag of the present invention adopts composite graphite material, which has low resistivity and better conductivity than EKG conductive plastic, and has strong corrosion resistance and flexibility. The composite material bagged sand well electrode has high drainage efficiency; the sand well electrode manufacturing method is simple, easy to operate, and has low production cost. Copper wire is arranged inside the conductive sand bag to enhance the current at the bottom of the electrode, thereby increasing the electric field strength in the deep formation, so as to achieve the purpose of enhancing the deep electroosmosis effect. The copper wire inside the conductive sand bag is all wrapped with composite graphite material, which improves the performance of the conductor and solves the problem of easy corrosion of traditional metal electrodes; even long-term electroosmosis can maintain low resistivity, especially in the reinforcement treatment of high-salinity marine sedimentary strata, blown silt and other areas. The composite graphite material electrode has low resistivity and high melting point, which solves the problem of EKG plastic drainage board heating and resistivity increase in the middle and late stages of electroosmosis as the formation resistance and interface resistance increase, and then the electrode softens and fails. The purpose of adding aluminum powder and antimony tin oxide to the composite graphite electrode material is to improve the conductivity of expanded graphite; metal aluminum has better corrosion resistance than commonly used conductive metal materials such as copper and iron, and is cheaper than antimony tin oxide. Adding a certain amount of aluminum powder is aimed at reducing the proportion of antimony tin oxide, which plays a role in optimizing the economic efficiency of the material. The composite graphite electrode is a flexible material with a rougher surface, which is more fully in contact with the surrounding soil, and can reduce the interface resistance during the electroosmosis process.

[0027] The installation and construction method of the composite bagged sand well electrode for combined electroosmosis and preloading of the present invention is consistent with that of the ordinary bagged sand well, and can be used in combination with the vacuum preloading method and the heap load preloading method when treating soft soil foundations, and has a wide range of application scenarios. Since the conductive sand bag has strong corrosion resistance, the cathode and anode can be swapped by exchanging the positive and negative poles of the power supply during the electroosmosis operation without consuming the electrodes, thereby improving the foundation treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a composite material bagged sand well electrode provided in Example 1 of the present invention;

[0029] Figure 2 A schematic diagram of the cross-sectional structure of a composite material bagged sand well electrode provided in Example 1 of the present invention;

[0030] Figure 3This is a schematic diagram of the cross-sectional structure of a graphite metal composite conductor according to Example 1 of the present invention;

[0031] Figure 4 This is a partial enlarged view of the composite geotechnical conductive fabric of Example 1 of the present invention;

[0032] Figure 5 A schematic diagram of the composite material bagged sand well electrode structure provided in Example 2 of the present invention;

[0033] Figure 6 It is a partial enlarged view of the resin flat wire and the composite geotechnical conductive flat wire in Example 2 of the present invention;

[0034] Figure 7 A schematic diagram of the cross-sectional structure of a composite bagged sand well electrode provided in Example 2 of the present invention;

[0035] Figure 8 This is a schematic diagram of the cross-sectional structure of the composite geotechnical conductive flat wire according to Example 2 of the present invention;

[0036] Fig. 9 A schematic diagram of the composite material bagged sand well electrode structure provided in Example 3 of the present invention;

[0037] Fig.10 A schematic diagram of the cross-sectional structure of a composite material bagged sand well electrode provided in Example 3 of the present invention;

[0038] Fig.11 A schematic diagram of the cross-sectional structure of a graphite metal composite conductive flat strip provided in Example 3 of the present invention;

[0039] Fig.12 It is a schematic diagram of treating soft soil foundation by using composite material bagged sand well electrode combined with vacuum preloading method in the present invention;

[0040] Fig.13 It is a schematic diagram of the plane layout of the composite material bagged sand well electrode in the present invention;

[0041] Fig.14 It is a schematic diagram of treating soft soil foundation by using composite material bagged sand well electrode combined with heap loading preloading method in the present invention.

[0042] Reference numerals:

[0043] 1. Conductive sand bag; 111. Woven bag; 112. Composite geotechnical conductive cloth; 113. Graphite metal composite conductor; 114. Lower tie; 115. Polyester thread; 116. Copper wire; 117. Graphite conductive glue; 118. Upper tie; 121. Resin flat wire; 122. Composite geotechnical conductive flat wire; 123. Composite graphite flat belt; 124. Nylon wire; 131. Graphite metal composite conductive flat strip; 132. Cable tie; 133. Composite graphite flat strip; 2. Sand column; 3. DC power supply; 4. Vacuum pump; 41. Vacuum pipeline; 5. Drainage sand cushion; 6. Sealing film; DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. The specific implementation of the present invention is described below to facilitate the understanding of the present invention by those skilled in the art, but it should be clear that the present invention is not limited to the scope of the specific implementation. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

[0045] Example 1

[0046] This embodiment provides a composite material bagged sand well electrode for combined electroosmosis and preloading. The composite material bagged sand well electrode uses a conductive sand bag 1 to fill a sand column 2, thereby realizing the integration of the electrode and the drainage body. During construction, the two construction processes of installing the bagged sand well and installing the electrode can be combined into one, thereby increasing the construction speed and reducing the engineering cost. Specifically, the method includes:

[0047] Conductive sand bag 1 and sand column 2 filled inside the conductive sand bag 1; the composite bagged sand well electrode is sunk inside the soft soil foundation, which can not only act as an electrode for conducting electricity, but also can be directly used as a bagged sand well for drainage.

[0048] like Figure 1 and Figure 2 As shown, the conductive sand bag 1 includes a woven bag 111, a composite geoconductive fabric 112 and a graphite metal composite conductor 113; the sand column 2 is filled in the woven bag 111; a layer of composite geoconductive fabric 112 is sheathed on the outside of the woven bag 111; a plurality of graphite metal composite conductors 113 are arranged between the woven bag 111 and the composite geoconductive fabric 112; and an upper tie 118 and a lower tie 114 are fixed at both ends of the composite geoconductive fabric 112. The composite geoconductive fabric 112 wraps the woven bag 111 and the sand column 2 at the outermost side, has the largest cross-sectional area, a small overall resistance, and excellent conductive performance; and the composite geoconductive fabric 112 of this design also has the largest contact area with the surrounding soil, and can conduct electricity well with the surrounding soil and moisture.

[0049] like Figure 3As shown, the graphite metal composite conductor 113 includes a polyester wire 115 and a copper wire 116, and a plurality of copper wires 116 are woven around the polyester wire 115 by a weaving machine; a layer of composite geoconductive cloth 112 is wrapped around the plurality of copper wires 116; the gap between the copper wire 116 and the composite geoconductive cloth 112 is filled with graphite conductive glue 117; the polyester wire 115 and the copper wire 116 are woven together by a weaving machine and embedded between the woven bag 111 and the composite geoconductive cloth 112, and the copper wire 116 can greatly improve the conductivity efficiency of the electrode.

[0050] like Figure 4 As shown, the geosynthetic conductive fabric 112 is provided with plum blossom-shaped water-permeable holes. To ensure the mechanical strength of the geosynthetic conductive fabric 112, the water-permeable holes are spaced appropriately. To ensure that the cross-sectional area of ​​the geosynthetic conductive fabric 112 is large enough and its overall conductive performance is good, the water-permeable holes are preferably slender.

[0051] The constituent materials of the composite geoconductive fabric 112 include, by weight: 70 parts of expanded graphite, 8 parts of aluminum powder, 5 parts of antimony tin oxide, 15 parts of glass fiber, 10 parts of epoxy resin and 3 parts of carbonizing agent; wherein the expanded graphite has a particle size of 500-1000 mesh and a bulk density of 0.002-0.005 g / cm 3 ; The aluminum powder is obtained by mixing fine aluminum powder and medium aluminum powder in equal proportions, and its particle size is 350-2000 mesh; antimony tin oxide is obtained by mixing SnO2 and Sb2O3 in a weight ratio of 9:1, and the primary particle size of the mixture is 10-15nm, and the secondary particle size is 50-60nm.

[0052] The preparation process of the composite geoconductive fabric 112 is as follows: expanded graphite, aluminum powder, antimony tin oxide, glass fiber, epoxy resin and carbonizing agent are mixed in proportion, and prepared by rolling, thermoplastic and cutting molding processes; wherein the rolling pressure is 50-70MPa, the temperature is 180-200°C, and the thermoplastic temperature is 200-250°C.

[0053] The resistivity of composite geoconductive fabric 112 is not more than 5×10 -5 Ω·m.

[0054] The woven bag 111 can be formed by weaving a resin material such as polypropylene and polyethylene at one time, or by folding and sewing a single layer of plastic woven fabric in half. After preparation, the composite geoconductive fabric 112 is folded and sewn into a long bag, which is put outside the sandbag; or it can be folded and sewn into a long tube bag after being stacked into a double layer with the single layer of plastic woven fabric of the woven bag 111. The length of the composite geoconductive fabric 112 should not be shorter than the length of the plastic sandbag at both ends.

[0055] Before the conductive sand bag 1 is filled with sand, it is sealed by the lower opening 114; after the lower opening 114 is sealed, the upper sand filling frame can be used to fill sand and gravel, so that the sand and gravel form a dense sand column 2 in the conductive sand bag 1; after the sand filling is completed, it is sealed by the upper opening 118.

[0056] The upper tie opening 118 and the lower tie opening 114 can be made of nylon tie, stainless steel tie, plastic tie, etc.

[0057] Example 2

[0058] This embodiment provides a conductive sand bag 1 based on a composite bagged sand well electrode for combined electroosmosis and pre-compression provided in Embodiment 1; the conductive sand bag 1 can improve the radial water permeability of the composite bagged sand well electrode, and ensure that the water inside the soft soil foundation passes through the conductive sand bag 1 smoothly; the details are as follows:

[0059] like Figure 5-Figure 7 As shown, the conductive sand bag 1 is a bag body formed by interlacing and weaving a plurality of resin flat wires 121, and a composite geotechnical conductive flat wire 122 is provided every several resin flat wires 121 along the length direction of the bag body; the sand column 2 is filled in the bag body; the upper and lower binding openings 118 and 114 are respectively fixed at both ends of the bag body; the resin flat wires 121 and the composite geotechnical conductive flat wires 122 are woven into the conductive sand bag 1, and the weaving design will not reduce the radial water permeability of the formation to the sand well; it is ensured that the moisture in the soil can flow into the inside of the composite material bagged sand well electrode.

[0060] like Figure 8 As shown, the composite geotechnical conductive flat wire 122 includes a composite graphite flat strip 123, which is a hollow double-layer structure; a single-layer flat rope woven from nylon wire 124 and copper wire 116 is arranged between the double-layer structure, and the gap between the single-layer braided rope and the composite graphite flat strip 123 is filled with graphite conductive glue 117; copper wire is added to the composite geotechnical conductive flat wire 122, which has better conductive properties than the pure composite geotechnical conductive cloth 112 material.

[0061] The constituent materials of the composite graphite flat strip 123 include, by weight: 60 parts of expanded graphite, 5 parts of aluminum powder, 5 parts of antimony tin oxide, 25 parts of glass fiber, 12 parts of epoxy resin and 2 parts of carbon forming agent.

[0062] When preparing the composite graphite flat strip 123, a single-layer structure is first prepared by rolling, thermoplasticization and cutting molding processes, and a single-layer structure of the composite graphite flat strip 123 is covered on the upper and lower sides of the single-layer flat rope impregnated with the graphite conductive adhesive 117, and then the composite graphite flat strip 123 is formed by secondary high-temperature rolling. The secondary high-temperature rolling pressure is 90-100MPa and the temperature is 180-200°C.

[0063] Example 3

[0064] This embodiment provides a conductive sand bag 1 based on a composite material bagged sand well electrode for combined electroosmosis and pre-pressing provided in Embodiment 1; the conductive sand bag 1 has a simple structure and is easy to produce and process compared to the conductive sand bag 1 prepared by a weaving process provided in Embodiment 2; the details are as follows:

[0065] like Fig. 9 and Fig.10 As shown, the conductive sand bag 1 includes a woven bag 111, and the sand column 2 is filled in the woven bag 111; a plurality of graphite metal composite conductive flat strips 131 are distributed circumferentially on the outer side of the woven bag 111, and the plurality of graphite metal composite conductive flat strips 131 are tied to the woven bag 111 by cable ties 132; an upper tie 118 and a lower tie 114 are fixed at both ends of the woven bag 111 and the graphite metal composite conductive flat strips 131; a plurality of graphite metal composite conductive flat strips 131 are directly fixed to the outside of the woven bag 111 by cable ties 132, the structure is simple, the difficulty of the processing technology is reduced, and it is easy to implement; a plurality of graphite metal composite conductive flat strips 131 are equidistantly arranged on the outer periphery of the woven bag 111, which does not affect the overall water permeability of the sand bag.

[0066] like Fig.11 As shown, the graphite metal composite conductive flat strip 131 includes a composite graphite flat strip 133, and the composite graphite flat strip 133 is a hollow double-layer structure; a plurality of conductors woven from polyester threads 115 and copper threads 116 are arranged side by side between the double-layer structures, and a graphite conductive adhesive 117 is filled between the plurality of conductors and the composite graphite flat strip 133. The composite graphite flat strip 133 is designed with woven polyester threads 115 and copper threads 116, which increases the thickness and cross-sectional area of ​​the graphite metal composite conductive flat strip 131 and reduces the resistivity; at the same time, the copper threads 116 inside the composite graphite flat strip 133 can improve the conductive performance of the graphite metal composite conductive flat strip 131.

[0067] The composite graphite flat strip 133 is composed of the following materials by weight: 65 parts of expanded graphite, 8 parts of aluminum powder, 10 parts of antimony tin oxide, 15 parts of glass fiber, 10 parts of epoxy resin and 3 parts of carbon forming agent.

[0068] Example 4

[0069] This embodiment provides a composite material bagged sand well electrode for combined electroosmosis and preloading provided in Example 1, and provides a method for treating soft soil foundation by using a composite material bagged sand well electrode combined with vacuum preloading, such as Fig.12 As shown; specifically including:

[0070] Several composite material bagged sand well electrodes are buried in the soft soil foundation, and the burial method is the same as that of ordinary bagged sand wells. Fig.13 As shown, the composite material bagged sand well electrodes are arranged in a square structure or in a triangle structure.

[0071] After the arrangement is completed, the positive and negative electrodes of the DC power supply 3 are respectively connected to the conductive sand bags 1 of the composite material bagged sand well electrodes in two adjacent rows.

[0072] A drainage sand cushion layer 5 is laid on the soft soil foundation, and the drainage sand cushion layer 5 is covered with a sealing film 6 ; a vacuum pipeline 41 is pre-buried inside the drainage sand cushion layer 5 , and the vacuum pipeline 41 and the vacuum pump 4 are connected.

[0073] Example 5

[0074] This embodiment provides a method for treating soft soil foundation by using a composite bagged sand well electrode combined with heap loading preloading, based on a composite bagged sand well electrode for combined electroosmosis and preloading provided in Embodiment 1; the burying method and power supply connection method of the composite bagged sand well electrode in this method are similar to those in Embodiment 4, except that:

[0075] like Fig.14 As shown, heavy objects are piled on top of the drainage sand cushion layer 5 to provide additional load for the soft soil foundation and accelerate its drainage and consolidation.

[0076] Those skilled in the art will appreciate that the embodiments herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the invention.

Claims

1. A composite material bagged sand well electrode for combined electroosmosis and pre-pressing, characterized in that: It comprises a conductive sand bag (1), wherein the conductive sand bag (1) is filled with sand columns (2).

2. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 1, characterized in that: The conductive sand bag (1) comprises a woven bag (111), and the sand column (2) is filled in the woven bag (111); a layer of composite geoconductive cloth (112) is provided on the outside of the woven bag (111); a plurality of graphite metal composite conductors (113) are provided between the woven bag (111) and the composite geoconductive cloth (112); and an upper tie opening (118) and a lower tie opening (114) are respectively fixed at both ends of the composite geoconductive cloth (112).

3. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 2, characterized in that: The graphite metal composite conductor (113) comprises a polyester wire (115), a plurality of copper wires (116) are woven around the polyester wire (115) by a weaving machine; a layer of composite geoconductive fabric (112) is wrapped around the plurality of copper wires (116); and the gaps between the plurality of copper wires (116) and the composite geoconductive fabric (112) are filled with graphite conductive glue (117).

4. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 3, characterized in that: The composite geoconductive fabric (112) comprises, by weight, 70 parts of expanded graphite, 8 parts of aluminum powder, 5 parts of antimony tin oxide, 15 parts of glass fiber, 10 parts of epoxy resin and 3 parts of carbonizing agent.

5. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 1, characterized in that: The conductive sand bag (1) is a bag body formed by interlacing and weaving a plurality of resin flat wires (121), and a composite geotechnical conductive flat wire (122) is provided every several resin flat wires (121) along the length direction of the bag body; the sand column (2) is filled in the bag body; and an upper tie opening (118) and a lower tie opening (114) are respectively fixed at both ends of the bag body.

6. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 5, characterized in that: The composite geotechnical conductive flat wire (122) comprises a composite graphite flat strip (123), wherein the composite graphite flat strip (123) is a hollow double-layer structure; a single-layer flat rope woven from nylon wire (124) and copper wire (116) is arranged between the double-layer structures, and a gap between the single-layer braided rope and the composite graphite flat strip (123) is filled with graphite conductive glue (117).

7. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 6, characterized in that: The composite graphite flat strip (123) comprises, by weight, 60 parts of expanded graphite, 5 parts of aluminum powder, 5 parts of antimony tin oxide, 25 parts of glass fiber, 12 parts of epoxy resin and 2 parts of carbon forming agent.

8. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 1, characterized in that: The conductive sand bag (1) comprises a woven bag (111), and the sand column (2) is filled in the woven bag (111); a plurality of graphite metal composite conductive flat strips (131) are distributed circumferentially on the outer side of the woven bag (111), and the plurality of graphite metal composite conductive flat strips (131) are tied to the woven bag (111) by means of a tie band (132); an upper tie opening (118) and a lower tie opening (114) are fixed at both ends of the woven bag (111) and the graphite metal composite conductive flat strips (131).

9. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 8, characterized in that: The graphite metal composite conductive flat strip (131) comprises a composite graphite flat strip (133), wherein the composite graphite flat strip (133) is a hollow double-layer structure; a plurality of conductors woven from polyester threads (115) and copper threads (116) are arranged side by side between the double-layer structures, and graphite conductive glue (117) is filled between the plurality of conductors and the composite graphite flat strip (133).

10. The composite bagged sand well electrode for combined electroosmosis and pre-pressing according to claim 9, characterized in that: The composite graphite flat strip (133) comprises, by weight, 65 parts of expanded graphite, 8 parts of aluminum powder, 10 parts of antimony tin oxide, 15 parts of glass fiber, 10 parts of epoxy resin and 3 parts of carbon forming agent.

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