A method and system for combining microorganisms and vibroflotation to strengthen foundation

Abstract

The present invention discloses a method and system for microbial-vibroflotation combined reinforcement of foundation, which belongs to the technical field of foundation reinforcement, and solves the problem that the reinforcement effect of the surface layer of soil body by vibroflotation is poor compared with the reinforcement effect of the deeper layer; the method is specifically: loading the microbial liquid into a microbial liquid storage box; injecting the microbial liquid into the loose foundation to be reinforced by a microbial-vibroflotation combined vibrator; spraying the microbial liquid on the surface of the loose foundation to be reinforced by a microbial liquid spraying device. In the present invention, the microbial liquid is sprayed by a microbial-vibroflotation combined vibrator, and the microbial induced calcium carbonate precipitation method and the vibroflotation method of foundation reinforcement are combined, so that the microbial liquid can be better dispersed in the gaps of the loose foundation to be reinforced, and the precipitation is induced to reinforce the foundation; after reinforcement, the slurry microbial liquid is sprayed on the surface of the loose foundation to be reinforced, and the surface foundation with poor vibration reinforcement effect is subjected to microbial secondary reinforcement.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation reinforcement, and in particular to a method and system for combining microorganisms and vibration to reinforce foundation. Background Art

[0002] The reinforcement of loose foundations has always been a concern of geotechnical engineering. Loose foundations can cause potential dangers such as uneven settlement, weak foundation bearing capacity, and earthquake liquefaction, so it is necessary to find a suitable foundation reinforcement method to improve them.

[0003] Vibroflotation is a method of ground reinforcement that can be used to reinforce loose foundations. It uses the excitation force brought by repeated high-speed vibrations of the vibrator to cause compaction and liquefaction of the reinforced soft foundation to form a dense foundation. The foundation treated by the vibroflotation method has a higher density and stronger foundation bearing capacity, as well as better resistance to liquefaction. Therefore, the vibroflotation method has been widely used in the field of foundation treatment. However, studies have shown that the reinforcement effect of the vibroflotation method on the surface of the soil is not as good as that on the deeper layers, and secondary reinforcement may be required in the project.

[0004] Microbial-induced carbonate precipitation is a widely-existing biologically-induced mineralization reaction in nature, and the reinforcement of foundations by microorganisms has also been systematically and scientifically demonstrated. Among them, urea-hydrolyzing bacteria, namely urease bacteria, are widely present in the natural environment. Commonly used urease bacteria, such as Sporosarcina pasteurii, are non-toxic and harmless, have strong stability, have certain resistance to harsh environments such as strong acid and alkali, high temperature and high salt, and can still maintain strong biological characteristics.

[0005] The vibration method and the microbial reinforcement method are combined to form a foundation reinforcement method that can effectively reinforce the foundation as a whole. Therefore, in order to better achieve the foundation treatment effect, the present invention discloses a method for combining microorganisms and vibration to reinforce the foundation. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a method and system for combining microorganisms and vibration to reinforce foundations, which solves the problem that the reinforcement effect of the vibration method on the surface layer of the soil is poor compared to the reinforcement effect on the deeper layers.

[0007] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0008] A method for combining microorganisms and vibroflotation to strengthen foundations comprises the following steps:

[0009] S1: preparing a microbial liquid and loading the microbial liquid into a microbial liquid storage tank;

[0010] S2: Connect the microbial liquid storage tank and the microbial-vibratory combined vibrator; inject the microbial liquid into the loose foundation to be reinforced through the microbial-vibratory combined vibrator;

[0011] S3: Connect the microbial liquid storage tank and the microbial liquid spraying device; spray the microbial liquid on the surface of the loose foundation to be reinforced through the microbial liquid spraying device.

[0012] In this scheme, a microbial-vibratory combined vibrator is used to spray microbial liquid, which combines the microbial induced calcium carbonate precipitation method and the vibratory method in foundation reinforcement, so that the microbial liquid can be better dispersed in the gaps of the loose foundation to be reinforced, and induces the formation of precipitation to reinforce the foundation; after reinforcement, the slurry microbial liquid is sprayed on the surface of the loose foundation to be reinforced, and the surface foundation with poor vibratory reinforcement effect is subjected to microbial secondary reinforcement, thereby avoiding the problem of poor reinforcement effect of the surface soil of the foundation after the vibratory method is used to reinforce the foundation.

[0013] Furthermore, the microbial liquid in S1 is a urease-producing bacteria liquid.

[0014] In this scheme, when calcium ions exist in the solution, since the surface of the urease bacteria carries a negative charge, the calcium ions are gradually adsorbed on the surface of the urease bacteria and react with the carbonate ions in the solution to generate calcium carbonate crystals with a certain cementing effect that wrap around the urease bacteria, thereby allowing the soil particles to be cemented and bonded by the generated calcium carbonate crystals.

[0015] Furthermore, S2 includes:

[0016] S201: connecting one end of the microbial liquid transmission tube to the microbial liquid storage box, and connecting the other end of the microbial liquid transmission tube to the microbial-vibration combined vibrator;

[0017] S202: The microbial liquid in the microbial liquid storage box is transmitted to the top of the microbial-vibration combined vibrator through the microbial liquid transmission pipe;

[0018] S203: The microbial liquid is sprayed at the top of the microbial-vibration combined vibrator to form a high-pressure vibration top spray liquid;

[0019] S204: Control the microorganism-vibration combined vibrator to sink to a specified depth and perform retention vibration;

[0020] S205: After the residual vibration is completed, the microorganism-vibration combined vibrator is lifted to the surface, and the vibration is completed; a deep microorganism-vibration reinforcement foundation is formed inside the loose foundation to be reinforced, and a surface vibration compact foundation is formed on the surface of the loose foundation to be reinforced.

[0021] In this scheme, the high-pressure spraying of bacterial liquid at the top of the microbial-vibratory combined vibrator can play three major roles: helping the vibrator to sink and penetrate, helping the soil to liquefy, and better entering the gaps between the soil for reinforcement; with the occurrence of vibration and soil liquefaction, the deep foundation is reinforced into a deep microbial-vibratory reinforced foundation.

[0022] Furthermore, S3 includes:

[0023] S301: removing the microorganism-vibration combined vibrator connected to the end of the microorganism liquid transmission pipe and replacing it with a microorganism liquid spraying device;

[0024] S302: The microbial liquid in the microbial liquid storage box is transmitted to the microbial liquid spraying device through the microbial liquid transmission pipe;

[0025] S303: The microbial liquid is sprayed onto the surface of the vibrated compacted foundation through a microbial liquid spraying device to form a microbial secondary reinforced surface foundation.

[0026] In this scheme, the density of the surface foundation after vibration reinforcement is relatively weaker than that of the deep layer. Therefore, a microbial liquid spraying device is used to evenly spray the microbial slurry onto the surface vibration compacted foundation. The microbial liquid penetrates into the surface vibration compacted foundation that has not yet been completely compacted to form a microbial secondary reinforcement of the surface foundation, completing the secondary reinforcement of the surface foundation by microorganisms, and preventing the problem of the soil on the surface of the foundation being still loose after vibration reinforcement.

[0027] In the second aspect, the present invention provides a system for combining microorganisms and vibration to reinforce foundations based on a method for combining microorganisms and vibration to reinforce foundations provided in the first aspect, comprising a microorganism liquid storage box, a microorganism liquid transmission pipe, a microorganism-vibration combined vibrator and a microorganism liquid spraying device; the microorganism liquid storage box is connected to one end of the microorganism liquid transmission pipe, and the other end of the microorganism liquid transmission pipe is connected to the microorganism-vibration combined vibrator or the microorganism liquid spraying device.

[0028] Furthermore, the microbial liquid transmission pipe and the microbial-vibration combined vibrator are connected via a pipe connection device.

[0029] The beneficial effects of the present invention are:

[0030] The method for combining microorganisms and vibroflotation to reinforce foundation provided by the present invention uses vibroflotation to reinforce the deep foundation, and then performs secondary reinforcement of the surface foundation by spraying microbial liquid at a later stage, so that the foundation strength is improved; compared with the reinforced foundation after the traditional vibroflotation method, the method solves the problem that the reinforcement effect of the surface vibroflotation reinforcement area is poor due to insufficient upper load and continuous vibration.

[0031] The method for combining microorganisms and vibroflotation to reinforce foundations provided by the present invention utilizes a microorganism-vibroflotation combined vibrator to spray microbial bacterial liquid at high pressure. Under the repeated vibration and loosening of the vibrator, the microbial bacterial liquid sprayed at high pressure can better enter the cracks in the soil and carry out the calcium carbonate precipitation project, thereby realizing the combination of vibroflotation technology and microbial induced calcium carbonate technology, and can reinforce a foundation with strong bearing capacity and anti-liquefaction ability.

[0032] The principle of the method for combined microbial-vibration reinforcement of foundation provided by the present invention is easy to understand, easy to operate, and low in cost. It can effectively increase the reinforcement strength, anti-liquefaction ability and reinforcement uniformity of loose foundations, and is an effective foundation reinforcement method for loose foundations. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the connection structure of the microorganism-vibration combined vibrator and the microorganism liquid storage box of the present invention;

[0034] Figure 2 It is a schematic diagram of the structure of the microorganism-vibration combined vibrator of the present invention sunk into the loose foundation to be reinforced;

[0035] Figure 3 This is a schematic diagram of the structure completed in the vibro-impact stage of the present invention;

[0036] Figure 4 It is a schematic diagram of the connection structure of the microorganism-vibration combined vibrator and the microorganism liquid spraying device of the present invention.

[0037] Reference numerals:

[0038] 1. Microbial-vibration combined vibrator; 2. Microbial liquid storage box; 3. Microbial liquid; 4. Microbial liquid transmission pipe; 5. Pipe connection device; 7. Microbial liquid spraying device; 6. Deep microbial-vibration reinforcement foundation; 8. Microbial secondary reinforcement of surface foundation; 9. Loose foundation to be reinforced; 11. Surface vibration compaction foundation; DETAILED DESCRIPTION

[0039] 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.

[0040] Example 1

[0041] The embodiment provides a method for strengthening the foundation by microorganism-vibroflotation. The method uses the vibroflotation method to strengthen the deep foundation. After the reinforcement, the microbial liquid sprayed on the surface of the foundation performs secondary reinforcement of the surface foundation, which solves the problem that the surface foundation reinforcement effect is poor due to insufficient upper load and continuous vibration after the vibroflotation method is used to strengthen the foundation. The method specifically includes the following steps:

[0042] S1: Prepare microbial liquid 3 and put the microbial liquid 3 into the microbial liquid storage tank 2, such as Figure 1 As shown;

[0043] The microbial liquid 3 is a urease-producing bacteria liquid, and the urease-producing bacteria is preferably Sporosarcina pasteurianus.

[0044] S2: Connect the microbial liquid storage tank 2 and the microbial-vibratory combined vibrator 1; inject the microbial liquid 3 into the loose foundation 9 to be reinforced through the microbial-vibratory combined vibrator 1; specifically include:

[0045] S201: connecting one end of the microorganism liquid transmission tube 4 to the microorganism liquid storage box 2, and connecting the other end of the microorganism liquid transmission tube 4 to the microorganism-vibration combined vibrator 1;

[0046] S202: The microbial liquid 3 in the microbial liquid storage box 2 is transmitted to the top of the microbial-vibration combined vibrator 1 through the microbial liquid transmission pipe 4;

[0047] S203: The microbial liquid 3 forms a high-pressure spraying liquid at the top of the microbial-vibratory combined vibrator 1; the high-pressure spraying liquid at the top of the microbial-vibratory combined vibrator 1 can play three major roles: helping the vibrator to sink and penetrate, helping the soil to liquefy, and better entering the gaps between the soil to reinforce;

[0048] S204: Control the microorganism-vibration combined vibrator 1 to sink to a specified depth and perform retention vibration, such as Figure 2 As shown;

[0049] S205: After the residual vibration is completed, the microorganism-vibration combined vibrator 1 is lifted to the surface, and the vibration is completed; a deep microorganism-vibration reinforcement foundation 6 is formed inside the loose foundation 9 to be reinforced, and a surface vibration compact foundation 11 is formed on the surface of the loose foundation 9 to be reinforced. Figure 3 shown.

[0050] S3: Connect the microbial liquid storage box 2 and the microbial liquid spraying device 7; spray the microbial liquid 3 on the surface of the loose foundation 9 to be reinforced through the microbial liquid spraying device 7; specifically include:

[0051] S301: Remove the microorganism-vibration combined vibrator 1 connected to the end of the microorganism liquid transmission pipe 4 and replace it with a microorganism liquid spraying device 7, such as Figure 4 As shown;

[0052] S302: The microbial liquid 3 in the microbial liquid storage box 2 is transmitted to the microbial liquid spraying device 7 through the microbial liquid transmission pipe 4;

[0053] S303: The microbial liquid 3 is sprayed onto the surface of the surface vibro-compacted compacted foundation 11 by the microbial liquid spraying device 7 to form a microbial secondary reinforced surface foundation 8.

[0054] In this embodiment, the density of the surface foundation after vibration reinforcement is weaker than that of the deep layer. Therefore, the microbial liquid spraying device 7 is used to evenly spray the microbial slurry onto the surface vibration compacted foundation 11. The microbial liquid 3 penetrates into the surface vibration compacted foundation 11 that has not been completely compacted to form a microbial secondary reinforcement surface foundation 8, completing the secondary reinforcement of the surface foundation by microorganisms, and preventing the problem that the soil on the surface of the foundation is still soft after vibration reinforcement.

[0055] Example 2

[0056] like Figure 1-Figure 4 As shown, this embodiment provides a system for combining microorganisms and vibration to reinforce the foundation based on a method for combining microorganisms and vibration to reinforce the foundation provided in Embodiment 1, specifically comprising: a microorganism liquid storage box 2, a microorganism liquid transmission pipe 4, a microorganism-vibration combined vibrator 1 and a microorganism liquid spraying device 7; the microorganism liquid storage box 2 is connected to one end of the microorganism liquid transmission pipe 4, and the other end of the microorganism liquid transmission pipe 4 is connected to the microorganism-vibration combined vibrator 1 or the microorganism liquid spraying device 7.

[0057] The microorganism liquid transmission pipe 4 and the microorganism-vibration combined vibrator 1 are connected via a pipe connection device 5 .

[0058] 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 method for combining microorganisms and vibroflotation to strengthen foundations, characterized in that: The following steps are involved: S1: preparing a microbial liquid (3), and loading the microbial liquid (3) into a microbial liquid storage tank (2); S2: connecting the microbial liquid storage tank (2) and the microbial-vibratory combined vibrator (1); injecting the microbial liquid (3) into the loose foundation to be reinforced (9) through the microbial-vibratory combined vibrator (1); S3: Connecting the microbial liquid storage box (2) and the microbial liquid spraying device (7); spraying the microbial liquid (3) onto the surface of the loose foundation (9) to be reinforced through the microbial liquid spraying device (7).

2. The method for strengthening foundation by microorganism-vibration combination according to claim 1, characterized in that: The microbial liquid (3) in S1 is a urease bacteria liquid.

3. The method for strengthening foundation by microorganism-vibration combination according to claim 2, characterized in that: The S2 includes: S201: connecting one end of the microorganism liquid transmission tube (4) to the microorganism liquid storage box (2), and connecting the other end of the microorganism liquid transmission tube (4) to the microorganism-vibration combined vibrator (1); S202: The microbial liquid (3) in the microbial liquid storage box (2) is transmitted to the top of the microbial-vibration combined vibrator (1) through the microbial liquid transmission pipe (4); S203: the microbial liquid (3) is sprayed at the top of the microbial-vibration combined vibrator (1) to form a vibration top high-pressure spraying liquid; S204: Control the microorganism-vibration combined vibrator (1) to sink to a specified depth and perform retention vibration; S205: After the residual vibration is completed, the microorganism-vibration combined vibrator (1) is lifted to the surface, and the vibration is completed; a deep microorganism-vibration reinforcement foundation (6) is formed inside the loose foundation to be reinforced (9), and a surface vibration compact foundation (11) is formed on the surface of the loose foundation to be reinforced (9).

4. The method for strengthening foundation by microorganism-vibration combination according to claim 3, characterized in that: The S3 includes: S301: removing the microorganism-vibration combined vibrator (1) connected to the end of the microorganism liquid transmission pipe (4) and replacing it with a microorganism liquid spraying device (7); S302: The microbial liquid (3) in the microbial liquid storage box (2) is transmitted to the microbial liquid spraying device (7) through the microbial liquid transmission pipe (4); S303: The microbial liquid (3) is sprayed onto the surface of the surface vibro-compacted compacted foundation (11) through the microbial liquid spraying device (7), thereby forming a microbial secondary reinforced surface foundation (8).

5. A system for implementing the method of microbial-vibration combined foundation reinforcement according to any one of claims 1 to 4, characterized in that: The invention comprises a microbial liquid storage box (2), a microbial liquid transmission pipe (4), a microbial-vibration combined vibrator (1) and a microbial liquid spraying device (7); the microbial liquid storage box (2) is connected to one end of the microbial liquid transmission pipe (4), and the other end of the microbial liquid transmission pipe (4) is connected to the microbial-vibration combined vibrator (1) or the microbial liquid spraying device (7).

6. The system of the method for combining microorganisms and vibroflotation to strengthen foundation according to claim 5, characterized in that: The microorganism liquid transmission pipe (4) and the microorganism-vibration combined vibrator (1) are connected via a pipe connection device (5).

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