Intelligent desaturation three-dimensional geogrid for soft foundation reinforcement and construction method of intelligent desaturation three-dimensional geogrid

Abstract

The invention discloses an intelligent desaturation three-dimensional geogrid for soft foundation reinforcement and a construction method thereof.The three-dimensional geogrid is provided with an electrolysis desaturation system and a microorganism desaturation system, and the three-dimensional geogrid is arranged in pairs and comprises an upper-layer grid and a lower-layer grid; the upper-layer grating and the lower-layer grating are respectively different electrode plates, and a plurality of resistors are arranged above the lower-layer grating at intervals; a plurality of liquid inlet pipelines are paved on the surfaces of the upper-layer grating and the lower-layer grating in a crossed manner, the liquid inlet pipeline positioned on the upper-layer grating is communicated with the liquid inlet pipeline positioned on the lower-layer grating through a bracket, the liquid inlet pipelines are connected with a saccharomycetes culture device, and the saccharomycetes culture device is connected with a hydraulic device. According to the method, the electrolysis desaturation method and the biological desaturation method are combined, when the electrolysis desaturation method stops in emergency, the biological desaturation method can still play a role, and the fault tolerance of the desaturation system is improved; meanwhile, the stability and durability of the desaturation method are ensured.

Description

Technical Field

[0001] The invention relates to an intelligent desaturated three-dimensional geogrid and a construction method thereof, and in particular to an intelligent desaturated three-dimensional geogrid for reinforcing a soft foundation and a construction method thereof. Background Art

[0002] Most ports are built on muddy beaches, usually with a dredger-filled foundation with poor foundation conditions. The use of geogrids to reinforce the base of the yard can significantly improve the reinforcement effect. The pavement structure consists of a surface layer, a base layer, and a cushion layer. The base layer and cushion layer not only play a load-bearing role, but also have the function of dispersing the upper load. Their strength and deformation directly affect the service life of the entire pavement structure. The dredger-filled foundation is mostly silt or clay. The dredger-filled soil has a high water content and is difficult to drain, has low shear strength, high compressibility, large settlement, and poor resistance to liquefaction. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to propose an intelligent desaturated three-dimensional geogrid for reinforcing soft foundations and a construction method thereof, so as to improve the anti-liquefaction strength of soft soil through the combination of electrolytic desaturation and microbial desaturation.

[0004] Technical solution: The three-dimensional geogrid of the present invention is provided with an electrolysis desaturation system and a microbial desaturation system. The three-dimensional geogrid adopts grids arranged in pairs, including an upper grid and a lower grid. The upper grid and the lower grid are different electrode plates respectively, and a plurality of resistors are arranged at intervals above the lower grid; a plurality of liquid inlet pipes are cross-laid on the surfaces of the upper grid and the lower grid, and the liquid inlet pipe located on the upper grid is connected to the liquid inlet pipe located on the lower grid through a bracket, and the liquid inlet pipe is connected to a yeast culture device, and the yeast culture device is connected to a hydraulic device.

[0005] The hydraulic device is connected to the control end, and the yeast in the yeast culture device is driven by the hydraulic device to flow into the liquid inlet pipe and then into the soil through the liquid outlet hole.

[0006] The resistor is connected to the control terminal.

[0007] The outer side surface of the support is provided with a plurality of liquid outlet holes for injecting yeast liquid.

[0008] The liquid inlet pipeline is connected to the yeast culture device through a liquid inlet pipe.

[0009] The yeast microorganisms in the yeast culture device are cultured to 10-100 g / L, the concentration of the glucose solution is 3-20 g / L, and the overall pH value is maintained at 4.5-5.

[0010] The upper grid and the lower grid are connected to a power source, and the upper grid and the lower grid are used as two electrode plates to electrolyze pore water, which can effectively improve the anti-liquefaction performance of the foundation.

[0011] The three-dimensional geogrid is made of conductive metal wire or conductive fiber film. The interlocking effect and tensile strength of the three-dimensional geogrid with the soil can also play a reinforcing role, ensuring that the foundation has sufficient strength.

[0012] The three-dimensional geogrid is laid in the sand cushion layer, the bottom of the sand cushion layer is the soil foundation, and the top layer and the base layer are laid. The sand cushion layer not only plays a load-bearing role, but also has the function of dispersing the upper load. It is the main structural layer of the pavement structure, and its strength and deformation directly affect the service life of the entire pavement structure.

[0013] A construction method of an intelligent desaturated three-dimensional geogrid for reinforcing a soft foundation comprises the following steps:

[0014] S1. Obtain the relationship between the saturation and resistivity of unsaturated sand under electrolysis conditions;

[0015] S2, input the data into the control terminal and set the desaturation threshold according to the project needs;

[0016] S3. Cultivate the yeast microorganism to 10-100 g / L according to the desaturation requirements, the concentration of the glucose solution is 3-20 g / L, and the overall pH value is maintained at 4.5-5;

[0017] S4. Place a three-dimensional grid on the foundation, connect the grid to the charging line, connect the bracket to the liquid inlet pipe of the bacterial liquid, lay a sand cushion layer after the grid is installed, and lay the base layer and surface layer on the sand cushion layer;

[0018] S5, obtaining the resistance value of the current foundation soil through a resistor, and converting it into the current soil saturation;

[0019] S6. If the current soil saturation value exceeds the threshold, the control end controls the hydraulic device to inject the bacterial solution into the soil, and the oxygen generated by the electrolysis of the pore water enables the yeast to perform aerobic respiration. In addition to anaerobic respiration, the yeast also performs aerobic respiration;

[0020] S7. Repeat the above steps to keep the soil in an unsaturated state for a long time.

[0021] Beneficial effects: The present invention has the following advantages:

[0022] 1) The present invention skillfully combines the electrolytic desaturation method and the biological desaturation method. When the electrolytic desaturation method stops due to an emergency, the biological desaturation method can still continue to work, thereby improving the fault tolerance of the desaturation system; at the same time, yeast can undergo a long-term and stable chemical reaction, thereby allowing bubbles to remain in the foundation for a long time, thereby ensuring the stability and durability of the desaturation method;

[0023] 2) The present invention uses a three-dimensional geogrid as a carrier for reinforcing the foundation, combines the electrolysis desaturation method and the microbial desaturation method to improve the anti-liquefaction performance of the soil. The oxygen generated by the electrolysis of pore water enables the yeast to perform aerobic respiration. In addition to anaerobic respiration, the yeast can also perform aerobic respiration at the same time, which can produce more gas than anaerobic respiration, so that the anti-liquefaction performance of the soil is further improved. The process is simple and the function is powerful;

[0024] 3) The invention is simple to construct, and organically combines reinforced soil, microbial desaturation, electrolytic desaturation, and detection system. It is green, environmentally friendly, economical, and easy to apply in engineering practice. It can fully and automatically regulate the stability of soft soil foundation for a long time.

[0025] 4) The present invention uses three-dimensional geogrids to reinforce the foundation, and utilizes the advantages of horizontal reinforced cushions and vertical connecting brackets for two-way reinforcement, effectively solving the problem of uneven settlement of the foundation;

[0026] 5) The structural form of the three-dimensional grid of the present invention can effectively change the development trend of the destruction of the plastic zone inside the foundation, make up for the defect of low tensile strength of the filler, and effectively prevent the destruction from developing deep;

[0027] 6) The present invention uses the upper and lower layers of conductive geogrids as two electrode plates to electrolyze pore water, which can not only effectively improve the anti-liquefaction performance of the foundation, but also the tensile strength of the grid itself and the interlocking effect of the soil can play a reinforcing role, ensuring that the foundation has sufficient strength;

[0028] 7) The yeast used in the present invention is widely present in nature and will not damage the original ecological environment. In addition, the artificially cultivated yeast is easy to obtain, the cultivation process is simple, and the gas production capacity is huge. The products of aerobic or anaerobic respiration of the yeast are also non-hazardous and clean and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a front view of the present invention;

[0031] Figure 3 is a top view of the present invention;

[0032] Figure 4It is a structural schematic diagram of a three-dimensional grid vertical connecting frame of the present invention;

[0033] Figure 5 It is a construction schematic diagram of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] like Figure 1 to Figure 5 As shown, the intelligent desaturated three-dimensional geogrid for reinforcing soft foundation of the present invention is laid in the sand cushion layer 14, which can not only reinforce the roadbed in the horizontal direction, but also further enhance the reinforcement effect of the soil in the vertical direction. Below the sand cushion layer 14 is the soil foundation 16, and above it are the base layer and the surface layer 15. The sand cushion layer 14 not only plays a load-bearing role, but also has the function of dispersing the upper load. It is the main structural layer of the pavement structure, and its strength and deformation directly affect the service life of the entire pavement structure.

[0036] The three-dimensional geogrid is provided with an electrolysis desaturation system and a microbial desaturation system. The three-dimensional geogrid adopts a grid arranged in pairs, including an upper grid 1 and a lower grid 2. The geogrid is made of a conductive metal wire or a conductive fiber film. The upper grid 1 and the lower grid 2 are used as different electrode plates and are connected to a power supply 9. Using the upper grid 1 and the lower grid 2 as two electrode plates to electrolyze pore water can not only effectively improve the anti-liquefaction performance of the foundation, but also the interlocking effect and tensile strength of the three-dimensional grid itself with the soil can play a reinforcing role to ensure that the foundation has sufficient strength. A plurality of brackets 3 are connected between the upper grid 1 and the lower grid 2 to form a three-dimensional frame. The outer side of each bracket 3 is provided with a plurality of liquid outlets 13 for injecting yeast liquid.

[0037] A plurality of liquid inlet pipes 4 are cross-laid on the surface of the upper grid 1 and the lower grid 2, and the liquid inlet pipe 4 located on the upper grid 1 is connected to the liquid inlet pipe 4 located on the lower grid 2 through a bracket 3. The liquid inlet pipe 4 is connected to the yeast culture device through a liquid inlet pipe 12, the yeast culture device is connected to a hydraulic device 6, and the hydraulic device 6 is connected to a control end 8. The yeast in the yeast culture device is driven by the hydraulic device 6 to flow into the liquid inlet pipe 4, and then flow into the soil through the liquid outlet 13. The yeast used in the present invention is easy to culture and has a large gas production capacity, and will not affect the original ecological environment. The oxygen generated by the electrolysis of pore water enables the yeast to perform aerobic respiration. In addition to anaerobic respiration, the yeast can also perform aerobic respiration at the same time, thereby significantly improving the gas production efficiency compared with anaerobic respiration, and further improving the anti-liquefaction strength of the soil. The process is simple and the function is powerful.

[0038] In this embodiment, yeast incubators are provided on both sides of the hydraulic device 6, including a first yeast incubator 5 and a second yeast incubator 7. The first yeast incubator 5 and the second yeast incubator 7 are connected to the liquid inlet pipes 4 located on both sides of the three-dimensional geogrid through liquid inlet pipes 12 respectively.

[0039] A plurality of resistors 10 are arranged at intervals above the lower grid 2. The resistors 10 are connected to the control terminal 8 through wires 11. The soil resistance value is measured through the resistors 10. When the soil resistance value reaches a set value, the control terminal 8 starts to work, energizes the geogrid, and injects bacterial liquid into the soil through a hydraulic device.

[0040] When the saturation of the soil reaches the set threshold, the control terminal 8 controls the hydraulic device 6 to drive the yeast in the yeast culture device to flow into the soil. According to the desaturation requirements, the yeast microorganisms are cultured to 10-100g / L, the glucose solution concentration is 3-20g / L, and the overall pH value is maintained at 4.5-5. At this time, the geogrid plate electrolyzes the soil pore water to produce a reaction:

[0041]

[0042] Anode: 4OH - -4e - =2H 2 O+O 2 ↑

[0043] Cathode: 4H + +4e - =2H 2 ↑

[0044] Yeast performs aerobic respiration and anaerobic respiration, and the reactions are as follows:

[0045] Aerobic respiration: C 6 H 12 O 6 (Glucose)+6H 2 O(water)+6O 2 (Oxygen) enzyme → 6CO 2 (Carbon dioxide) + 12H 2 O (water) + ATP (a lot of energy)

[0046] Anaerobic respiration: alcoholic fermentation: C 6 H 12 O 6 (Glucose) → 2C 2 H 5 OH(alcohol)+2CO 2 (Carbon dioxide) + ATP (energy).

[0047] The present invention uses a three-dimensional geogrid as a carrier for reinforcing the foundation, and combines the electrolysis desaturation method and the microbial desaturation method to improve the anti-liquefaction performance of the soil. In addition, the oxygen generated by the electrolysis of pore water allows yeast to perform aerobic respiration. In addition to anaerobic respiration, yeast can also perform aerobic respiration at the same time, thereby producing more gas than anaerobic respiration, further improving the anti-liquefaction performance of the soil, and the process is simple and powerful. By cleverly combining the electrolysis desaturation method and the biological desaturation method, when the electrolysis desaturation method stops in an emergency, the biological desaturation method can still continue to play a role, thereby improving the fault tolerance of the desaturation system. At the same time, yeast can undergo a long-term and stable chemical reaction, so that bubbles can be retained in the foundation for a long time, ensuring the stability and durability of the desaturation method.

[0048] The construction method of the intelligent desaturated three-dimensional geogrid for reinforcing soft foundation of the present invention comprises the following steps:

[0049] S1. Carry out the Miller Soil Box model test based on the principle of measuring soil resistivity by voltammetry to obtain the relationship between the saturation and resistivity of unsaturated sand under electrolysis conditions. According to the formula In the formula, ρ is the resistivity of the soil, U is the voltage between the positive and negative electrodes, S is the cross-sectional area of ​​the current passing through the soil, i is the current passing through both ends of the soil, and L is the distance between the positive and negative electrodes. Where ρ is the soil resistivity, ρ ω is the resistivity of pore water, S r is the saturation of the soil, and a, b, and f are all empirical parameters. Since the pore water in the soil will generate heat and cause temperature changes during the electrolysis process, it is necessary to correct the relationship between the saturation and resistivity of sand under electrolysis conditions, using the formula In the formula, ρ T is the resistivity of sand, ɑ is 0.025℃ -1 , 18 is the resistivity at 18°C, and T is the temperature of the sand.

[0050] S2. Input the data into the cloud platform control terminal and set the desaturation threshold according to the project needs.

[0051] S3. According to the desaturation requirements, the yeast microorganisms are cultured to 10-100 g / L, the concentration of the glucose solution is 3-20 g / L, and the overall pH value is maintained at 4.5-5.

[0052] S4. Place a three-dimensional grid on the foundation, connect the grid to the charging line, connect the bracket to the liquid inlet pipe of the bacterial liquid, and after the grid is installed, proceed to the subsequent construction, lay the sand cushion layer, and continue to lay the base layer and surface layer on the sand cushion layer.

[0053] S5. Obtain the current resistance value of the foundation soil through the resistor, and automatically transmit it to the cloud storage according to the data collected in the test, and convert it into the current soil saturation.

[0054] S6. If the current soil saturation value exceeds the threshold, the control end starts to be powered on and the yeast culture device is turned on. The bacterial solution is injected into the soil through the hydraulic device. The oxygen generated by the electrolysis of pore water enables the yeast to perform aerobic respiration. In addition to anaerobic respiration, yeast can also perform aerobic respiration at the same time, thereby producing more gas than anaerobic respiration, thereby further improving the soil's anti-liquefaction performance.

[0055] S7. Repeat the above steps to keep the soil in an unsaturated state for a long time. The three-dimensional grid can not only reinforce the soil and ensure the overall stability of the yard, but also further enhance the anti-liquefaction ability.

Claims

1. An intelligent desaturated three-dimensional geogrid for reinforcing soft foundations, characterized in that: The three-dimensional geogrid is provided with an electrolysis desaturation system and a microbial desaturation system. The three-dimensional geogrid adopts grids arranged in pairs, including an upper grid and a lower grid. The upper grid and the lower grid are different electrode plates respectively, and a plurality of resistors are arranged at intervals above the lower grid. A plurality of liquid inlet pipes are cross-laid on the surfaces of the upper grid and the lower grid. The liquid inlet pipe located on the upper grid is connected to the liquid inlet pipe located on the lower grid through a bracket. The liquid inlet pipe is connected to a yeast culture device, and the yeast culture device is connected to a hydraulic device.

2. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 1, characterized in that: The hydraulic device is connected to the control end.

3. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 2, characterized in that: The resistor is connected to the control terminal.

4. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 1, characterized in that: The outer side surface of the bracket is provided with a plurality of liquid outlet holes.

5. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 4, characterized in that: The liquid inlet pipeline is connected to the yeast culture device through a liquid inlet pipe.

6. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 5, characterized in that: The yeast microorganisms in the yeast culture device are cultured to 10-100 g / L, the concentration of the glucose solution is 3-20 g / L, and the overall pH value is maintained at 4.5-5.

7. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 1, characterized in that: The upper grid and the lower grid are connected to a power source.

8. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 7, characterized in that: The three-dimensional geogrid is made of conductive metal wire or conductive fiber film.

9. The intelligent desaturated three-dimensional geogrid for reinforcing soft foundation according to claim 1 or 8, characterized in that: The three-dimensional geogrid is laid in a sand cushion layer, a soil foundation is provided below the sand cushion layer, and a base layer and a surface layer are provided above the sand cushion layer.

10. A construction method of the intelligent desaturated three-dimensional geogrid for reinforcing a soft foundation as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Obtain the relationship between the saturation and resistivity of unsaturated sand under electrolysis conditions; S2, input the data into the control terminal and set the desaturation threshold according to the project needs; S3. Cultivate the yeast microorganism to 10-100 g / L according to the desaturation requirements, the concentration of the glucose solution is 3-20 g / L, and the overall pH value is maintained at 4.5-5; S4. Place a three-dimensional grid on the foundation, connect the grid to the charging line, connect the bracket to the liquid inlet pipe of the bacterial liquid, lay a sand cushion layer after the grid is installed, and lay the base layer and surface layer on the sand cushion layer; S5, obtaining the resistance value of the current foundation soil through a resistor, and converting it into the current soil saturation; S6. If the current soil saturation value exceeds the threshold, the control end controls the hydraulic device to inject the bacterial solution into the soil, and the oxygen generated by the electrolysis of the pore water enables the yeast to perform aerobic respiration. In addition to anaerobic respiration, the yeast also performs aerobic respiration; S7. Repeat the above steps to keep the soil in an unsaturated state for a long time.

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