Drainage plate and mucky soil rapid drainage consolidation device and method

Abstract

The invention discloses a drainage plate and a mucky soil rapid drainage consolidation device and method.The drainage plate comprises a core plate framework of a honeycomb structure and an insulation isolation layer arranged on the outer side of the core plate framework, the core plate framework is composed of a plurality of hexagonal hollow pipes, and vacuum air guide branch pipes are embedded in cavities of the hexagonal hollow pipes; a drainage channel is formed between the core plate framework and the insulation isolation layer, a filtering layer and a protection layer are sequentially arranged on the outer side of the insulation isolation layer, and a cathode electrode layer and an anode electrode layer are arranged between the two sides of the insulation isolation layer and the filtering layer respectively. The mucky soil rapid drainage consolidation device comprises a sealing film, a direct-current power supply, a vacuum pump, a PU vacuum pipe and a plurality of drainage plates. The sealing film is fixedly connected with the protective layer of each drainage plate; positive and negative electrodes of the direct-current power supply are respectively connected with the drain board electrodes; and the vacuum pump is connected with the vacuum air guide branch pipe through the PU vacuum pipe. The fixing device is matched with the method, so that the structural strength of the drainage plate can be improved, the synergistic interaction of vacuum preloading and electro-osmosis drainage is realized, and rapid drainage is realized to achieve a soil consolidation effect.

Description

Technical Field

[0001] This application belongs to the field of consolidation of silt soil, and particularly relates to a drainage board, a device and a method for rapid drainage consolidation of silt soil. Background Art

[0002] Silt soil is soft soil deposited in a static or slow-flowing water environment. Its water content is usually as high as 50%-80%, the void ratio is greater than 1.0, the compression coefficient is high, and the shear strength is low. In engineering such as road construction and building foundation construction, if the silt soil foundation is directly used, it will cause the building to tilt and the road surface to crack due to excessive and uneven settlement, seriously affecting the project quality and safety. Traditional plastic drainage boards mostly use a single polypropylene material, with insufficient compressive strength (≤100 kPa), and are prone to deformation and blockage in highly compressible foundations, affecting the drainage effect. In addition, its structural function is single, lacking effective integration with electroosmosis technology, unable to achieve the synergistic effect of vacuum preloading and electroosmotic drainage, and unable to meet the high-efficiency drainage requirements under complex geological conditions. Summary of the Invention

[0003] This application provides a drainage board, a device and a method for rapid drainage consolidation of silt soil, aiming to improve the structural strength of the drainage board, achieve the synergistic effect of vacuum preloading and electroosmotic drainage, and enable rapid drainage to achieve the effect of soil consolidation.

[0004] To achieve the above application objectives, this application provides the following technical solutions:

[0005] According to one aspect of this application, a drainage board is provided. The drainage board includes a core board skeleton composed of a honeycomb structure formed by multiple hexagonal hollow tubes and an insulating isolation layer arranged outside the core board skeleton. The inner side of the hexagonal hollow tube is a hollow cavity, and a vacuum air guiding branch pipe is embedded in the hollow cavity. A drainage channel is formed between the core board skeleton and the insulating isolation layer. A filter layer and a protective layer are sequentially arranged outside the insulating isolation layer. A cathode electrode layer is arranged between one side of the insulating isolation layer and the filter layer, and an anode electrode layer is arranged between the other side and the filter layer.

[0006] Further, the insulating isolation layer is an EVA film with a thickness of 0.3 mm.

[0007] Further, the cathode electrode layer is made of graphene-modified carbon fiber woven cloth with a thickness of 0.5 mm and a conductivity ≥ 10 4 S / m, and the anode electrode layer is made of a titanium alloy platinum-plated fiber mesh with a wire diameter of 0.2 mm and a grid spacing of 10 mm.

[0008] Further, the filter layer uses short fiber needle-punched geotextile with an equivalent aperture O95 = 0.07 - 0.1 mm, and the protective layer uses a composite geomembrane with a thickness of 0.3 mm.

[0009] According to another aspect of the present application, a rapid drainage consolidation device for silt soil is provided, which includes a sealing film, a DC power supply, a vacuum pump, a PU vacuum tube, and a plurality of drainage plates described in the above technical solutions; the sealing film is fixedly connected to the protective layer of each drainage plate; the positive and negative electrodes of the DC power supply are respectively connected to the anode electrode layer and the cathode electrode layer on the drainage plate through wires, the vacuum pump is connected to the PU vacuum tube, and the PU vacuum tube is connected to the vacuum air guiding branch pipe on the drainage plate.

[0010] According to another aspect of the present application, a rapid drainage consolidation method for silt soil is provided, which is carried out using the rapid drainage consolidation device for silt soil described in the above technical solutions, and the steps are as follows:

[0011] S1. Site pretreatment: Level the site and lay a sand cushion layer with a thickness of 0.5 m and a permeability coefficient ≥ 1×10 -2 cm / s on the site;

[0012] S2. Drainage plate construction: Use a plate inserter to vertically insert the drainage plates into the site foundation, with the insertion depth reaching 0.5 m above the bearing layer, the spacing between drainage plates being 0.8 - 1.2 m, and the exposed length being 10 cm;

[0013] S3. System installation: Connect the anode electrode layer and the cathode electrode layer of the drainage plate to the DC power supply through wires respectively, arrange the electrodes of adjacent drainage plates with alternating positive and negative polarities, keep the electrode distance at 0.8 - 1.2 m and lay the sealing film, thermally weld the sealing film to the protective layer of the drainage plate, and then connect the vacuum air guiding branch pipe of the drainage plate to the vacuum pump through the PU vacuum tube;

[0014] S4. Joint action start: First, turn on the vacuum pump to make the vacuum pump stable above -90 kPa within 24 h, and connect the DC power supply after 48 h. Control the voltage gradient at 5 - 15 V / m and the current density ≤ 0.5 A / m². Real-time monitor the vacuum degree, current, and drainage volume through an intelligent control system, and automatically adjust the power supply parameters.

[0015] Furthermore, the sealing film adopts a three-layer polyethylene film, the wall thickness of the PU vacuum tube is 2 mm, and the single-pump flow rate of the vacuum pump is ≥ 100 m³ / h.

[0016] Compared with the prior art, the drainage plate, the rapid drainage consolidation device and method for silt soil described in the present application have the following beneficial effects:

[0017] (1) In the present application, the core board skeleton of the drainage plate adopts a honeycomb structure, which can greatly improve the bending strength and compressive strength of the core board and form a drainage channel for discharging pore water.

[0018] (2) In this application, the vacuum air guide branch pipe in the hollow cavity is connected to the external PU vacuum pipe. Under the action of a vacuum pump, a negative pressure environment underground is established, creating a pressure difference inside and outside the drainage board, driving pore water to flow towards the drainage board. The anode electrode layer and the cathode electrode layer in the drainage board are connected to a power supply. Under the action of the electric field force, anions move towards the anode, cations move towards the cathode, and drag the surrounding polar water molecules to move, thus forming electroosmotic seepage, achieving the effect of rapid drainage and quickly consolidating the surrounding soil mass.

[0019] (3) In this application, the insulating isolation layer can prevent current leakage into the drainage channel, and the filter layer can prevent soil particles from blocking the drainage channel. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the drainage board of this application;

[0021] Figure 2 It is a schematic diagram of the use of a rapid drainage and consolidation device for soft clay soil of this application;

[0022] In the figure: 1. Core board skeleton; 2. Vacuum air guide branch pipe; 3. Hollow cavity; 4. Drainage channel; 5. Insulating isolation layer; 6. Cathode electrode layer; 7. Anode electrode layer; 8. Filter layer; 9. Protective layer; 10. Sealing film; 11. DC power supply; 12. Vacuum pump; 13. PU vacuum pipe; 14. Drainage board. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this application. Unless otherwise defined, the technical terms or scientific terms used here shall have the ordinary meaning understood by those of ordinary skill in the art in the field to which this disclosure belongs. The "upper", "lower", "left", "right", "front", "rear", etc. used in the specification and claims of this patent application of this disclosure are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly. "Connection" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Where this application is not described in detail, it is common knowledge in the technical field of this application.

[0024] Embodiment 1:

[0025] Please refer to Figure 1, this application provides a drainage board. The drainage board 14 includes a core board skeleton 1 composed of a honeycomb structure formed by multiple hexagonal hollow tubes and an insulating isolation layer 5 arranged on the outer side of the core board skeleton 1. Preferably, multiple hexagonal hollow tubes can be arranged in a row, and multiple rows are set. Adjacent rows are connected by one or two hexagonal hollow tubes to form a honeycomb structure, which can greatly improve the bending strength and compressive strength of the core board. The inner side of the hexagonal hollow tube is a hollow cavity 3, and a vacuum air guide branch pipe 2 is embedded in the hollow cavity 3. The vacuum air guide branch pipe 2 is used to connect to an external vacuum system, and a drainage channel 4 is formed between the core board skeleton 1 and the insulating isolation layer 5. An outer filter layer 8 and a protective layer 9 are sequentially arranged on the outer side of the insulating isolation layer 5. A cathode electrode layer 6 is arranged between one side of the insulating isolation layer 5 and the filter layer 8, and an anode electrode layer 7 is arranged between the other side and the filter layer 8.

[0026] As a preferred embodiment, the insulating isolation layer 5 is an EVA film with a thickness of 0.3 mm.

[0027] As a preferred embodiment, the cathode electrode layer 6 is made of graphene-modified carbon fiber woven cloth with a thickness of 0.5 mm and a conductivity ≥ 10 4 S / m. The anode electrode layer 7 is made of a platinum-plated titanium alloy fiber mesh with a wire diameter of 0.2 mm and a grid spacing of 10 mm. The electrochemical corrosion resistance of the electrode layer is more than 3 times better than that of traditional steel electrodes, effectively avoiding the problem of "anode consumption".

[0028] As a preferred embodiment, the filter layer 8 is made of short fiber needle-punched geotextile with an equivalent aperture O95 = 0.07 - 0.1 mm, and the protective layer 9 is made of composite geomembrane with a thickness of 0.3 mm.

[0029] Example 2

[0030] Please refer to Figure 1 and Figure 2 , this application provides a device for rapid drainage and consolidation of silt soil, which includes a sealing film 10, a DC power supply 11, a vacuum pump 12, a PU vacuum tube 13 and multiple drainage boards 14 in Example 1; the sealing film 10 is fixedly connected to the protective layer 9 of each drainage board 14; the positive and negative poles of the DC power supply 11 are respectively connected to the anode electrode layer 7 and the cathode electrode layer 6 on the drainage board 14 through wires, the vacuum pump 12 is connected to the PU vacuum tube 13, and the PU vacuum tube 13 is connected to the vacuum air guide branch pipe 2 on the drainage board 14.

[0031] In this embodiment, the core plate skeleton 1 of the drainage board 14 adopts a honeycomb structure, which greatly improves the flexural strength and compressive strength of the core plate, and forms a drainage channel 4 for discharging pore water. When the drainage channel 4 has poor drainage due to core plate deformation or blockage, the pore water can be discharged through the hollow cavity 3 of the core plate skeleton 1; the vacuum air guide branch pipe 2 in the hollow cavity 3 is connected to the external PU vacuum pipe, and a subsoil negative pressure environment is established under the action of the vacuum pump 12, forming a pressure difference inside and outside the drainage board 14, driving the pore water to flow towards the drainage board 14. The anode electrode layer 7 and the cathode electrode layer 6 in the drainage board 14 are connected to the DC power supply 11. Under the action of the electric field force, anions move towards the anode, cations move towards the cathode, and drag the surrounding polar water molecules to move, thus forming an electroosmotic seepage. The insulating isolation layer 5 is to prevent current leakage to the drainage channel 4, and the filter layer 8 is to prevent soil particles from blocking the drainage channel 4. This device in this embodiment can realize the function of synergistic efficiency increase of the vacuum preloading negative pressure field and the electroosmotic electric field, and improve the drainage efficiency.

[0032] Embodiment 3:

[0033] Please refer to Figure 1 and Figure 2 , this application provides a method for rapid drainage consolidation of silt soil, which is carried out using a device for rapid drainage consolidation of silt soil in Embodiment 2. The steps are as follows:

[0034] S1. Site pretreatment: Level the site and lay a sand cushion layer with a thickness of 0.5 m and a permeability coefficient ≥ 1×10 -2 cm / s on the site;

[0035] S2. Construction of the drainage board 14: Use a board inserter to vertically insert the drainage board 14 into the site foundation, with the insertion depth reaching 0.5 m above the bearing stratum. The spacing of the drainage boards 14 is 0.8 - 1.2 m, and the exposed length is 10 cm;

[0036] S3. System installation: Connect the anode electrode layer 7 and the cathode electrode layer 6 of the drainage board 14 to the DC power supply 11 through wires respectively. The electrodes of adjacent drainage boards 14 are arranged alternately with positive and negative polarities, and the pole distance is kept at 0.8 - 1.2 m. Lay the sealing film 10, thermally weld the sealing film 10 to the protective layer 9 of the drainage board 14, and then connect the vacuum air guide branch pipe 2 of the drainage board 14 to the vacuum pump 12 through the PU vacuum pipe 13;

[0037] S4. Combined action start-up: First, turn on the vacuum pump 12 to make the vacuum pump 12 stable above -90 kPa within 24 hours. After 48 hours, connect the DC power supply 11, control the voltage gradient at 5 - 15 V / m, and the current density ≤ 0.5 A / m². Then, monitor the vacuum degree, current, and drainage volume in real time, and adjust the power supply parameters according to the monitoring situation. The whole process can be automatically monitored and the power supply parameters can be adjusted through an intelligent control system, which can be pre-designed based on previous implementation data, test data, etc.

[0038] As a preferred embodiment, the sealing film 10 is made of a three-layer polyethylene film, the wall thickness of the PU vacuum tube 13 is 2 mm, and the single-pump flow rate of the vacuum pump 12 is ≥ 100 m³ / h.

Claims

1. A drainage board, characterized in that, The drainage board (14) includes a core board framework (1) composed of a honeycomb structure formed by multiple hexagonal hollow tubes and an insulating isolation layer (5) arranged outside the core board framework (1). The inner side of the hexagonal hollow tube is a hollow cavity (3), and a vacuum air guide branch pipe (2) is embedded in the hollow cavity (3). A drainage channel (4) is formed between the core board framework (1) and the insulating isolation layer (5). A filter layer (8) and a protective layer (9) are sequentially arranged outside the insulating isolation layer (5). A cathode electrode layer (6) is arranged between one side of the insulating isolation layer (5) and the filter layer (8), and an anode electrode layer (7) is arranged between the other side and the filter layer (8).

2. A drainage board according to claim 1, characterized in that, The insulating isolation layer (5) is an EVA film with a thickness of 0.3 mm.

3. A drainage board according to claim 1, characterized in that, The cathode electrode layer (6) is made of graphene-modified carbon fiber woven cloth with a thickness of 0.5 mm and a conductivity ≥ 10 4 S / m. The anode electrode layer (7) is made of a platinum-plated titanium alloy fiber mesh with a wire diameter of 0.2 mm and a grid spacing of 10 mm.

4. A drainage board according to claim 1, characterized in that, The filter layer (8) uses short fiber needle-punched geotextile, and the equivalent aperture O95 = 0.07 - 0.1 mm. The protective layer (9) uses composite geomembrane with a thickness of 0.3 mm.

5. A rapid drainage and consolidation device for silty soil, characterized in that, It includes a sealing film (10), a DC power supply (11), a vacuum pump (12), a PU vacuum tube (13), and multiple drainage boards (14) according to any one of claims 1 - 4; the sealing film (10) is fixedly connected to the protective layer (9) of each drainage board (14); the positive and negative poles of the DC power supply (11) are respectively connected to the anode electrode layer (7) and the cathode electrode layer (6) on the drainage board (14) through wires. The vacuum pump (12) is connected to the PU vacuum tube (13), and the PU vacuum tube (13) is connected to the vacuum air guide branch pipe (2) on the drainage board (14).

6. A method for rapid drainage and consolidation of silt soil, characterized in that, It is carried out by using a device for rapid drainage and consolidation of silty soil according to claim 5, and the steps are as follows: S1. Site pre-treatment: Level the site and lay a sand cushion layer with a thickness of 0.5 m and a permeability coefficient ≥ 1×10 -2 cm / s on the site; S2. Construction of the drainage board (14): Use a plate insertion machine to vertically insert the drainage board (14) into the site foundation, with the insertion depth reaching 0.5 m above the bearing layer. The spacing of the drainage boards (14) is 0.8 - 1.2 m, and the exposed length is 10 cm; S3. System installation: Connect the anode electrode layer (7) and the cathode electrode layer (6) of the drainage board (14) to the DC power supply (11) through wires respectively. The electrodes of adjacent drainage boards (14) are arranged with alternating positive and negative polarities, and the pole distance is maintained at 0.8 - 1.2 m. Then lay the sealing film (10), and hot melt weld the sealing film (10) to the protective layer (9) of the drainage board (14). Then connect the vacuum air guide branch pipe (2) of the drainage board (14) to the vacuum pump (12) through the PU vacuum tube (13); S4. Start of combined action: First, turn on the vacuum pump (12) to make the vacuum pump (12) stable above -90 kPa within 24 h. After 48 h, connect the DC power supply (11), and control the voltage gradient at 5 - 15 V / m and the current density ≤ 0.5 A / m². Real-time monitor the vacuum degree, current, and drainage volume through an intelligent control system, and automatically adjust the power supply parameters.

7. A method for rapid drainage consolidation of silt soil according to claim 6, characterized in that, The sealing film (10) uses a three-layer polyethylene film. The wall thickness of the PU vacuum tube (13) is 2 mm, and the single-pump flow rate of the vacuum pump (12) ≥ 100 m³ / h.

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