Self-repairing high-strength composite geotextile based on MICP technology and preparation method thereof

Abstract

This invention discloses a self-healing high-strength composite geotextile based on MICP technology and its preparation method. It comprises a first bio-fiber geotextile, a high-strength composite geotextile, and a second bio-fiber geotextile arranged sequentially from bottom to top. The first bio-fiber geotextile is composed of animal fur fibers, plant stem and leaf fibers, and synthetic fibers, and is formed by needle punching. The high-strength composite geotextile is composed of high-strength warp fibers, high-strength weft fibers, and polypropylene fibers, interwoven in a cross-hatching manner to form a grid-like structure. The central pores of each grid-like structure formed by the high-strength warp fibers, high-strength weft fibers, and polypropylene fibers of the high-strength composite geotextile are uniform in size and uniform in shape. The second bio-fiber geotextile, composed of animal fur fibers, plant stem and leaf fibers, and synthetic fibers, is needle-punched through the central pores of the grid-like structure of the high-strength composite geotextile and connected to the fibers of the first bio-fiber geotextile.

Description

Technical Field

[0001] This invention relates to the technical field of geotextiles, and in particular to a self-healing high-strength composite geotextile based on MICP technology and its preparation method. It can be used to reinforce and protect slope engineering projects such as seawalls, riverbanks, and lake embankments in aquatic environments, and at the same time, it can utilize bio-solidification technology to biologically reinforce engineering structures such as backfill or grouted rubble on slopes. Background Technology

[0002] With the continuous development of engineering technology and infrastructure construction in my country, geotextiles, a new type of engineering material following timber, steel, and concrete, are widely used in various projects such as foundation pit engineering, road engineering, coastal engineering, sewage treatment plants, and landfills, playing a vital role. In slope engineering projects located in aquatic environments, such as seawalls, riverbanks, and lake embankments, the engineering functions of geotextiles are: firstly, reinforcement, strengthening and protecting dams and slopes; secondly, filtration, allowing liquids (such as seawater and groundwater) to pass through while preventing the loss of soil particles under osmotic pressure.

[0003] In fact, with the continuous development of construction projects, slope engineering in aquatic environments requires geotextiles with higher strength, longer service life, and self-healing capabilities to better protect engineering structures. These geotextiles should also utilize a bio-solidification process to achieve self-reinforcement and long-term use, reducing later maintenance costs. However, existing general geotextiles cannot meet these requirements and have the following shortcomings: 1. Poor mechanical strength, especially tensile and tear strength, making them prone to holes and cracks in various usage environments; 2. Insufficient service life, with a simple structural composition and a lack of high-lifespan and environmentally resistant fiber components; 3. Lack of self-healing capabilities, unable to reinforce and repair engineering structures during use, thus failing to reduce later maintenance or reconstruction costs.

[0004] Therefore, in order to meet the increasing construction requirements and address the problems of insufficient strength, short service life, and lack of self-healing ability of general geotextiles, there is an urgent need for a composite geotextile with high strength, long service life, and certain self-healing ability. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] The technical problem to be solved by the present invention is to provide a self-healing high-strength composite geotextile based on MICP technology and its preparation method. On the one hand, it improves the tensile strength of the self-healing high-strength composite geotextile and keeps its strength uniform, which can effectively resist the damage of loads in the environment and prevent most slope sliding in its application environment. On the other hand, it ensures the good permeability and reverse filtration function of the self-healing high-strength composite geotextile, which can resist most seepage erosion in its application environment.

[0007] (II) Technical Solution

[0008] The solution adopted by the present invention to solve the above-mentioned technical problems is a self-healing high-strength composite geotextile based on MICP technology. The self-healing high-strength composite geotextile based on MICP technology includes a self-healing high-strength composite geotextile; the self-healing high-strength composite geotextile is composed of a first bio-fiber geotextile, a high-strength composite geotextile, and a second bio-fiber geotextile arranged sequentially from bottom to top.

[0009] The first bio-fiber geotextile is composed of animal fur fibers, plant stem and leaf fibers and synthetic fibers, and is formed by needle punching process.

[0010] The high-strength composite geotextile is composed of high-strength warp fibers, high-strength weft fibers, and polypropylene fibers; and the high-strength warp fibers, high-strength weft fibers, and polypropylene fibers are interwoven with each other in a warp-weft crossing and overlapping manner to form a grid-like structure; and the central pores of each grid-like structure formed by the high-strength warp fibers, high-strength weft fibers, and polypropylene fibers of the high-strength composite geotextile are uniform and of the same size.

[0011] The second bio-fiber geotextile is formed by needle-punching animal fur fibers, plant stem and leaf fibers, and synthetic fibers through the central pores of the grid-shaped structure of the high-strength composite geotextile, and connecting them with the fibers of the first bio-fiber geotextile.

[0012] In some embodiments, the synthetic fibers in both the first and second bio-fiber geotextiles are polyester fibers, the animal fur fibers are mainly processed from poultry feathers and livestock (pigs, cattle, sheep, etc.) fur, and the plant stem and leaf fibers are mainly processed from the stem fibers of gramineous crops. All the fibers of the above-mentioned bio-fiber geotextiles are mixed and then processed by needle punching. The thickness of each layer of bio-fiber geotextile is about 3-4 mm, which gives it the water permeability and reverse filtration function of general needle-punched geotextiles. The gradual decomposition of bio-fibers can provide nitrogen fertilizer and carbon source for the solidification of microorganisms for a long time.

[0013] In some embodiments, the ratio of the high-strength warp fiber, the high-strength weft fiber, and the polypropylene fiber is 1:1:6; both the high-strength warp fiber and the high-strength weft fiber are made of ultra-high molecular weight polyethylene (UHMWPE) filament fiber, and the polypropylene fiber is made of polypropylene filament fiber; the tensile strength of the UHMWPE filament fiber is approximately 3000-3500 MPa, and the tensile strength of the polypropylene filament fiber is approximately 1000-1500 MPa, and both have a service life of at least 50 years in application environments such as embankment slopes, while the tensile strength of most geotextiles made of polyester fiber, polyamide fiber, and polypropylene staple fiber is usually between 500-800 MPa, and the service life is less than 30 years. Therefore, the tensile strength and service life of the self-healing high-strength composite geotextile based on MICP technology are significantly higher than those of general geotextiles.

[0014] In some embodiments, the side length of the central aperture of all the grid structures is 4 mm.

[0015] By adopting the above scheme, in the self-healing high-strength composite geotextile, the high-strength composite geotextile improves the mechanical strength and service life; the first bio-fiber geotextile and the second bio-fiber geotextile carry the substances required for microbial solidification, and play a role in biologically reinforcing the slope backfill, grouted riprap and other geotechnical structures on both sides of the geotextile.

[0016] In some embodiments, the outer surface of the self-healing high-strength composite geotextile is covered with a layer of PVA water-soluble slow-release film.

[0017] In some embodiments, the two outer surfaces of the self-healing high-strength composite geotextile are covered with a layer of PVA water-soluble slow-release film.

[0018] Using the above scheme, self-healing high-strength composite geotextile based on MICP technology is applied to slope engineering projects such as seawalls, riverbanks, and lake embankments that are in aquatic environments. It is required to avoid the loss of biological solidified substances on the geotextile due to water erosion during the construction period. Therefore, the setting of the PVA water-soluble slow-release film can prevent the loss of microbial solidified substances due to water erosion during construction.

[0019] In some embodiments, the proportion of synthetic fibers in both the first and second bio-fiber geotextiles is not less than 40%.

[0020] In some embodiments, the synthetic fiber content in the first and second bio-fiber geotextiles is about 40%, and the remainder is an arbitrary mixture of animal fur fiber and plant stem and leaf fiber, with a content of about 60%.

[0021] By adopting the above scheme, the mechanical strength of the first bio-fiber geotextile and the second bio-fiber geotextile can be guaranteed.

[0022] In some embodiments, the high-strength warp fibers, high-strength weft fibers, and polypropylene fibers of the high-strength composite geotextile are woven together by a warp knitting machine to form an integral structure; wherein, the polypropylene fiber is the matrix and accounts for not less than 60%.

[0023] In the above scheme, the polypropylene fiber is the matrix and accounts for no less than 60% to ensure the strength of the high-strength composite geotextile; while the high-strength warp fiber and high-strength weft fiber can play a reinforcing role, and the density of the high-strength warp fiber and high-strength weft fiber can be specifically determined according to the reinforcement requirements.

[0024] In some embodiments, the high-strength composite geotextile is fixed and limited after being connected to the first bio-fiber geotextile by needle punching of the fibers of the second bio-fiber geotextile; and the high-strength composite geotextile can be treated by a thermal bonding process after weaving so that the three types of fibers, namely high-strength warp fibers, high-strength weft fibers and polypropylene fibers, are bonded together at the intersection nodes.

[0025] Using the above method, the three types of fibers—high-strength warp fibers, high-strength weft fibers, and polypropylene fibers—are bonded together at their intersections using a thermal bonding process. This ensures that the three fibers are fixed together and will not slip, thus maintaining the stability of the central pore size.

[0026] In some embodiments, when the fibers of the second bio-fiber geotextile are needle-punched through the central pores of the grid structure of the high-strength composite geotextile, they avoid the fibers of the high-strength composite geotextile, which can be achieved through a grid positioning method.

[0027] The grid positioning method uses the needle-punching machine's mesh surface as a two-dimensional coordinate system. After the first bio-fiber geotextile and the high-strength composite geotextile are sequentially positioned and laid on the needle-punching machine, the computer measures the parameters of the side length of the central pore and the fiber diameter of the grid structure of the high-strength composite geotextile. It also measures the centroid coordinates of the first pore located at the corner point of the high-strength composite geotextile that is close to the positioning edge, and uses it as the starting reference coordinates. The above parameters are then input into the computer program, which outputs the relative coordinates of other pores, thereby achieving precise positioning of the pores of the entire high-strength composite geotextile.

[0028] The limiting laying method uses two orthogonal edges on the needle-punched machine mesh as limiting sides. The right-angled boundaries of the first bio-fiber geotextile and the high-strength composite geotextile are aligned with the limiting sides and laid on the needle-punched machine mesh, and the first bio-fiber geotextile and the high-strength composite geotextile are fixed with a pressing device.

[0029] Using the above scheme, after locating the central pores of the high-strength composite geotextile using the grid positioning method, the fibers of the second bio-fiber geotextile are needle-punched through the central pores of the grid structure of the high-strength composite geotextile, avoiding the fibers of the high-strength composite geotextile, and connecting with the fibers of the first bio-fiber geotextile, thus fixing the high-strength composite geotextile while forming it.

[0030] The solution adopted by this invention to solve the above-mentioned technical problems is a method for preparing a self-healing high-strength composite geotextile based on MICP technology, comprising the following steps:

[0031] (I) Preparation of the first bio-fiber geotextile: using animal fur fiber, plant stem and leaf fiber and synthetic fiber as raw materials, the first bio-fiber geotextile is formed by needle punching process;

[0032] (II) Preparation of high-strength composite geotextile: High-strength warp fibers, high-strength weft fibers and polypropylene fibers are woven together by warp and weft crossing and overlapping, and then heat-bonded at the intersection to make high-strength composite geotextile.

[0033] (III) Align the right-angled boundary of the first bio-fiber geotextile with the limiting edge of the needle punching machine, lay it on the mesh laying surface of the needle punching machine, then align the right-angled boundary of the high-strength composite geotextile with the limiting edge of the needle punching machine, lay it on top of the first bio-fiber geotextile, and fix the two layers of geotextile with the edge presser; use the grid positioning method to obtain the coordinates of all pore areas of the high-strength composite geotextile as the needle punching area;

[0034] (IV) The raw materials of the second bio-fiber geotextile, animal fur fiber, plant stem and leaf fiber and synthetic fiber, are laid on the high-strength composite geotextile after being filament-woven into a web, and the second bio-fiber geotextile is formed by needle punching.

[0035] (V) Prepare a mixed solution of Bacillus pasteurellii, urea and calcium chloride, spray it evenly on the surface of the sewn self-healing high-strength composite geotextile and let it dry.

[0036] In some embodiments, the high-strength composite geotextile formed in step (II) has polypropylene fibers woven between adjacent high-strength warp fibers and adjacent high-strength weft fibers; the high-strength warp fibers, high-strength weft fibers and polypropylene fibers have pores between each other, and the high-strength warp fibers and polypropylene fibers are evenly arranged in the longitudinal direction and the high-strength weft fibers and polypropylene fibers are evenly arranged in the transverse direction, so that the size of the central pores of each grid structure of the self-healing high-strength composite geotextile is the same, and the size of the central pores is sufficient to prevent most of the mud and sand from passing through in its application environment.

[0037] In some embodiments, during the needle punching process in step (IV), the needle passes through the central pore of the grid-shaped structure of the high-strength composite geotextile, entangles the fibers of the second bio-fiber geotextile near the needle with the fibers of the first bio-fiber geotextile, and while forming the second bio-fiber geotextile, restricts the position of the high-strength composite geotextile and makes the three-layer geotextile structure form an integral structure.

[0038] In some embodiments, the method further includes step (VI), applying a polyvinyl alcohol (PVA) coating liquid to the surface of a self-healing high-strength composite geotextile using a coating machine to form a PVA water-soluble slow-release film.

[0039] In some embodiments, the PVA water-soluble slow-release film is made from polyvinyl alcohol (PVA) coating liquid and coated onto the surface of a self-healing high-strength composite geotextile using a coating machine, and the resulting PVA water-soluble slow-release film has a thickness of approximately 1 mm.

[0040] (III) Beneficial Effects

[0041] Compared with existing technologies, this invention designs a self-healing high-strength composite geotextile based on MICP technology and its preparation method.

[0042] (1) The present invention has a scientific and reasonable composition structure and weaving process. On the one hand, it improves the tensile strength of the self-healing high-strength composite geotextile and keeps its strength uniform, which can effectively resist the damage of loads in the environment and prevent most of the slope sliding in its application environment. On the other hand, it ensures the good water permeability and reverse filtration function of the self-healing high-strength composite geotextile, which can resist most of the seepage erosion in its application environment.

[0043] (2) The high-strength, long-life material selected in this invention can adapt to the water environment of projects such as seawalls, riverbanks, and lakebanks, has good environmental tolerance, has a longer service life than ordinary geotextiles, reduces the later maintenance cost, and is more economical.

[0044] (3) This invention uses common warp knitting and needle punching techniques for sewing, which makes it easy to mass-produce self-healing high-strength composite geotextiles; no binding fibers are needed when composite three-layer geotextile structures, saving production costs; and positioning pore needle punching is used to ensure that the strength and service life of the original high-strength composite geotextile are not damaged when composite connecting three-layer structures.

[0045] (4) The present invention has biological self-repair capability. After the laying is completed, the biological solidification reaction is initiated, which can gradually strengthen the soil filling, grouting and other geotechnical structures on both sides of the geotextile. The biological fiber geotextile used in the present invention has the water permeability and reverse filtration function of general needle-punched geotextile, and the gradual decomposition of the fiber can provide nitrogen fertilizer and carbon source for the solidification of microorganisms for a long time.

[0046] (5) When the present invention is applied to slope engineering such as seawalls, riverbanks, and lakebanks in a water environment and PVA water-soluble slow-release film is applied, the present invention can control the start time of biological solidification. When the PVA water-soluble slow-release film is laid, it can effectively prevent seawater from contaminating the geotextile and causing the loss of biological solidification bacteria and substances, thus possessing a scientific and reasonable function.

[0047] (6) The PVA water-soluble slow-release film used in this invention has clean and pollution-free dissolution and degradation products that will not cause damage to the environment, which is in line with the concept of green development. In addition, the animal fur fiber and plant stem and leaf fiber used in this invention are mainly derived from agricultural and animal husbandry production waste, realizing the resource reuse of waste, which is in line with the concept of energy conservation and emission reduction. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Fig. 1 This is a schematic diagram of a self-healing high-strength composite geotextile based on MICP technology according to the present invention.

[0050] Fig. 2 This is a schematic diagram of the weaving method of the high-strength composite geotextile of the present invention;

[0051] Fig. 3 This is a plan view of the limiting installation of the acupuncture machine according to the present invention.

[0052] The component names corresponding to the various labels in the figure are: 1. First bio-fiber geotextile; 2. High-strength composite geotextile; 2-1. High-strength warp fiber; 2-2. High-strength weft fiber; 2-3. Polypropylene fiber; 3. Second bio-fiber geotextile; 4. PVA water-soluble slow-release film; 5. Needle-punched mesh surface; 6. Edge presser; 7. Limiting edge; L is the side length of the central pore of the grid structure. Detailed Implementation

[0053] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] It should be noted that the following description covers various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0057] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0058] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0059] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0060] like Figs. 1-3As shown, this invention provides a self-healing high-strength composite geotextile based on MICP technology, comprising a self-healing high-strength composite geotextile; the self-healing high-strength composite geotextile is composed of a first bio-fiber geotextile 1, a high-strength composite geotextile 2, and a second bio-fiber geotextile 3 arranged sequentially from bottom to top; the first bio-fiber geotextile 1 is composed of animal fur fibers, plant stem and leaf fibers, and synthetic fibers, and is formed by needle punching; the high-strength composite geotextile 2 is composed of high-strength warp fibers 2-1, high-strength weft fibers 2-2, and polypropylene fibers 2-3; and the high-strength warp fibers... The high-strength weft fibers 2-1, 2-2, and 2-3 of the high-strength composite geotextile 2 are interwoven in a warp-weft crossing and overlapping manner to form a grid-like structure; and the central pores of each grid-like structure formed by the high-strength warp fibers 2-1, 2-2, and 2-3 of the high-strength composite geotextile 2 are uniform and of the same size; the second bio-fiber geotextile 3 is formed by needle-punching animal fur fibers, plant stem and leaf fibers, and synthetic fibers through the central pores of the grid-like structure of the high-strength composite geotextile 2, and connecting with the fibers of the first bio-fiber geotextile 1. In some embodiments, the synthetic fibers in the first bio-fiber geotextile 1 and the second bio-fiber geotextile 3 are both polyester fibers, the animal fur fibers are mainly processed from poultry feathers and livestock (pigs, cattle, sheep, etc.) fur, and the plant stem and leaf fibers are mainly processed from the stem fibers of gramineous crops; all the fibers of the above-mentioned bio-fiber geotextile are mixed and then processed by needle punching, and the thickness of each layer of bio-fiber geotextile is 4mm, so that it has the water permeability and reverse filtration function of general needle-punched geotextile, while the gradual decomposition of bio-fibers can provide nitrogen fertilizer and carbon source for the solidification of microorganisms for a long time. In some embodiments, the ratio of the high-strength warp fiber 2-1, the high-strength weft fiber 2-2, and the polypropylene fiber 2-3 is 1:1:6; both the high-strength warp fiber 2-1 and the high-strength weft fiber 2-2 are made of ultra-high molecular weight polyethylene (UHMWPE) filament fiber, and the polypropylene fiber 2-3 is made of polypropylene filament fiber; the tensile strength of the UHMWPE filament fiber is approximately 3000-3500 MPa, and the tensile strength of the polypropylene filament fiber is approximately 1000-1500 MPa, and both have a service life of at least 50 years in application environments such as embankment slopes, while the tensile strength of most geotextiles made of polyester fiber, polyamide fiber, and polypropylene staple fiber is usually between 500-800 MPa, and the service life is less than 30 years. Therefore, the tensile strength and service life of the self-healing high-strength composite geotextile based on MICP technology are significantly higher than those of general geotextiles. In some embodiments, the side length of the central aperture of all the grid structures is 4 mm.Using the above scheme, in the self-healing high-strength composite geotextile, the high-strength composite geotextile 2 improves the mechanical strength and service life; the first bio-fiber geotextile 1 and the second bio-fiber geotextile 3 carry the substances required for microbial solidification, and play a role in biologically reinforcing the slope backfill, grouting, and other geotechnical structures on both sides of the geotextile.

[0061] In some embodiments, the outer surface of the self-healing high-strength composite geotextile is covered with a layer of PVA water-soluble slow-release film 4, and the thickness of the PVA water-soluble slow-release film 4 is 1 mm. In some embodiments, both the upper and lower outer surfaces of the self-healing high-strength composite geotextile are covered with a layer of PVA water-soluble slow-release film 4. Using the above scheme, the self-healing high-strength composite geotextile based on MICP technology is applied to slope engineering projects in aquatic environments such as seawalls, riverbanks, and lake embankments. It is required to prevent the loss of bio-solidified substances on the geotextile due to water erosion during the construction period; therefore, the setting of the PVA water-soluble slow-release film 4 can prevent the loss of microbial solidified substances due to water erosion during construction.

[0062] In some embodiments, the synthetic fiber content of the first bio-fiber geotextile 1 and the second bio-fiber geotextile 3 is approximately 40%, with the remainder being an arbitrary mixture of animal fur fibers and plant stem and leaf fibers, comprising approximately 60%. By employing the above scheme, the mechanical strength of the first bio-fiber geotextile 1 and the second bio-fiber geotextile 3 can be guaranteed.

[0063] In some embodiments, the high-strength warp fibers 2-1, high-strength weft fibers 2-2, and polypropylene fibers 2-3 of the high-strength composite geotextile 2 are woven together by a warp knitting machine to form an integral structure; wherein, the polypropylene fibers 2-3 are the matrix and account for no less than 60% to ensure the strength of the high-strength composite geotextile 2; while the high-strength warp fibers 2-1 and high-strength weft fibers 2-2 can play a reinforcing role, and the density of the high-strength warp fibers 2-1 and high-strength weft fibers 2-2 can be specifically determined according to the reinforcement requirements.

[0064] In some embodiments, the high-strength composite geotextile 2 is fixed and limited after being connected to the first bio-fiber geotextile 1 by needle punching of the fibers of the second bio-fiber geotextile 3; furthermore, after weaving, the high-strength composite geotextile 2 can be treated with a thermal bonding process to bond the three types of fibers—high-strength warp fiber 2-1, high-strength weft fiber 2-2, and polypropylene fiber 2-3—together at their intersections. Using the above method, the three types of fibers—high-strength warp fiber 2-1, high-strength weft fiber 2-2, and polypropylene fiber 2-3—are bonded together at their intersections through a thermal bonding process, ensuring that the three fibers are fixed together and do not slip, thus maintaining the stability of the central pore size.

[0065] In some embodiments, when the fibers of the second bio-fiber geotextile 3 are needle-punched and pass through the central pores of the grid-like structure of the high-strength composite geotextile 2, they avoid the fibers of the high-strength composite geotextile 2. This can be achieved through a grid positioning method. The grid positioning method uses the needle-punching machine's mesh-laying surface 5 as a two-dimensional coordinate system. After the first bio-fiber geotextile 1 and the high-strength composite geotextile 2 are sequentially positioned and laid on the needle-punching machine, the parameters of the side length of the central pores and the fiber diameter of the grid-like structure of the high-strength composite geotextile 2 are measured by computer, and the parameters of the fibers closely attached to the high-strength composite geotextile 2 are also measured. The centroid coordinates of the first pore at the corner of the limiting edge 7 are used as the starting reference coordinates. These parameters are then input into a computer program, which outputs the relative coordinates of other pores, thereby achieving precise positioning of the pores in the entire high-strength composite geotextile 2. The limiting laying method uses two orthogonal edges on the needle-punched mesh surface 5 as limiting edges 7. The right-angled boundaries of the first bio-fiber geotextile 1 and the high-strength composite geotextile 2 are aligned with the limiting edges 7 and laid on the needle-punched mesh surface 5. The first bio-fiber geotextile 1 and the high-strength composite geotextile 2 are then fixed using an edge presser 6. Using this scheme, after the central pore of the high-strength composite geotextile 2 is located using the grid positioning method, the fibers of the second bio-fiber geotextile 3 are needle-punched, passing through the central pores of the grid structure of the high-strength composite geotextile 2, avoiding the fibers of the high-strength composite geotextile 2, and connecting with the fibers of the first bio-fiber geotextile 1. This simultaneously shapes and limits the positioning of the high-strength composite geotextile 2.

[0066] This invention also provides a method for preparing a self-healing high-strength composite geotextile based on MICP technology, comprising the following steps:

[0067] (I) Preparation of the first bio-fiber geotextile 1: Using poultry feathers, livestock (pig, cattle, sheep, etc.) fur, gramineous crop stem fibers and polyester fibers as raw materials, the first bio-fiber geotextile 1 is formed by needle punching process with a thickness of 4mm.

[0068] (II) Preparation of high-strength composite geotextile 2: Ultra-high molecular weight polyethylene (UHMWPE) filament fibers are selected as high-strength warp fibers 2-1 and high-strength weft fibers 2-2, and polypropylene filament fibers are selected as polypropylene fibers 2-3; the high-strength warp fibers 2-1, high-strength weft fibers 2-2 and polypropylene fibers 2-3 are woven together by warp and weft crossing and overlapping, and then heat-bonded at the intersection to make high-strength composite geotextile 2;

[0069] (III) Align the right-angled boundary of the first bio-fiber geotextile 1 with the limiting edge 7 of the needle punching machine, and lay it on the mesh laying surface 5 of the needle punching machine. Then align the right-angled boundary of the high-strength composite geotextile 2 with the limiting edge 7 of the needle punching machine, and lay it on top of the first bio-fiber geotextile 1. Fix the two layers of geotextile with the edge presser 6. Use the grid positioning method to obtain the coordinates of all pore areas of the high-strength composite geotextile 2 as the needle punching area.

[0070] (IV) The raw materials of the second bio-fiber geotextile 3, namely poultry feathers, livestock (pig, cattle, sheep, etc.) fur, gramineous crop stem fibers and polyester fibers, are laid on the high-strength composite geotextile 2 after being filament-by- ...

[0071] (V) Prepare a mixed solution of Bacillus pasteurellii, urea and calcium chloride, spray it evenly on the surface of the sewn self-healing high-strength composite geotextile and let it dry.

[0072] (VI) Apply polyvinyl alcohol (PVA) coating liquid to the surface of the self-healing high-strength composite geotextile using a coating machine to form a PVA water-soluble slow-release film 4 with a thickness of 1 mm.

[0073] The mixed solution is prepared as follows: the mixed solution contains a cementing solution and a bacterial solution, which are mixed in a volume ratio of 1:1; the cementing solution is a 1 mol / L urea solution and a 1 mol / L calcium chloride solution mixed in a 1:1 ratio; the bacterial solution is a Bacillus pasteurellii bacterial solution with a concentration of OD600 = 1.0.

[0074] In some embodiments, the high-strength composite geotextile 2 formed in step (II) is woven with polypropylene fibers 2-3 between adjacent high-strength warp fibers 2-1 and adjacent high-strength weft fibers 2-2; the high-strength warp fibers 2-1, high-strength weft fibers 2-2 and polypropylene fibers 2-3 are separated by pores, and the longitudinal high-strength warp fibers 2-1 and polypropylene fibers 2-3 are evenly arranged, and the transverse high-strength weft fibers 2-2 and polypropylene fibers 2-3 are evenly arranged, so that the size of the central pores of each grid structure of the self-healing high-strength composite geotextile is the same, and the size of the central pores meets the requirement that most of the mud and sand can be prevented from passing through in its application environment.

[0075] In some embodiments, during the needle punching process in step (IV), the needle passes through the central pore of the grid-shaped structure of the high-strength composite geotextile 2, entangles the fibers of the second bio-fiber geotextile 3 near the needle with the fibers of the first bio-fiber geotextile 1, and while forming the second bio-fiber geotextile 3, restricts the position of the high-strength composite geotextile 2 and makes the three-layer geotextile structure form an integral structure.

[0076] In some embodiments, the PVA water-soluble slow-release film 4 is made from polyvinyl alcohol (PVA) coating liquid and coated onto the surface of a self-healing high-strength composite geotextile using a coating machine, and the thickness of the formed PVA water-soluble slow-release film 4 is about 1 mm.

[0077] The following is a specific application scenario of the self-healing high-strength composite geotextile based on MICP technology described in the above embodiments, but it is not limited to this: The self-healing high-strength composite geotextile based on MICP technology is transported from the factory to the embankment construction site. After leveling the slope area to be laid, the self-healing high-strength composite geotextile based on MICP technology is laid in that area. During construction, an overlap of more than 10cm is required between every two pieces of geotextile. During construction, if the slope experiences slight deformation, the laid self-healing high-strength composite geotextile based on MICP technology will... The process involves repairing minor deformations in the adaptive engineering of high-strength composite geotextiles to ensure a tight bond between the geotextile and the slope fill, allowing the geotextile to function properly in terms of protection, filtration, and bio-self-healing. After laying, a gravel cushion layer and grouted riprap are then laid on top of the geotextile. During construction, the PVA water-soluble slow-release film slowly dissolves, temporarily resisting water erosion of the geotextile. After completion, the film is basically dissolved, and water penetrates into the geotextile, triggering a bio-solidification (MICP) reaction that reinforces the structures on both sides of the geotextile.

[0078] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A self-healing high-strength composite geotextile based on MICP technology, characterized in that: It includes a self-healing high-strength composite geotextile; the self-healing high-strength composite geotextile is composed of a first bio-fiber geotextile (1), a high-strength composite geotextile (2), and a second bio-fiber geotextile (3) arranged sequentially from bottom to top; The first bio-fiber geotextile (1) is composed of animal fur fibers, plant stem and leaf fibers and synthetic fibers, and is formed by needle punching process; The high-strength composite geotextile (2) is composed of high-strength warp fibers (2-1), high-strength weft fibers (2-2), and polypropylene fibers (2-3); and the high-strength warp fibers (2-1), the high-strength weft fibers (2-2), and the polypropylene fibers (2-3) interweave with each other in a cross-cutting and overlapping manner to form a grid structure; and the central pores of each grid structure formed by the high-strength warp fibers (2-1), the high-strength weft fibers (2-2), and the polypropylene fibers (2-3) of the high-strength composite geotextile (2) are uniform and of the same size; The second bio-fiber geotextile (3) is formed by needle punching animal fur fibers, plant stem and leaf fibers and synthetic fibers through the central pores of the grid structure of the high-strength composite geotextile (2) and connecting with the fibers of the first bio-fiber geotextile (1). The outer surface of the self-healing high-strength composite geotextile is covered with a layer of PVA water-soluble slow-release film (4); the proportion of synthetic fibers in the first bio-fiber geotextile (1) and the second bio-fiber geotextile (3) is not less than 40%; the high-strength warp fibers (2-1), high-strength weft fibers (2-2) and polypropylene fibers (2-3) of the high-strength composite geotextile (2) are woven together by a warp knitting machine to form an integral structure; wherein, the polypropylene fibers (2-3) are the matrix and account for not less than 60%; the high-strength composite geotextile (2) is fixed by needle punching the fibers of the second bio-fiber geotextile (3) to the first bio-fiber geotextile (1); and the high-strength composite geotextile (2) is treated by a thermal bonding process after weaving so that the three fibers of high-strength warp fibers (2-1), high-strength weft fibers (2-2) and polypropylene fibers (2-3) are bonded together at the intersection nodes; When the fibers of the second bio-fiber geotextile (3) are needle-punched and pass through the central pores of the grid structure of the high-strength composite geotextile (2), they avoid the fibers of the high-strength composite geotextile (2) and are positioned by a grid method. The grid positioning method uses the needle punching machine mesh surface (5) as a two-dimensional coordinate system. After the first bio-fiber geotextile (1) and the high-strength composite geotextile (2) are sequentially positioned and laid on the needle punching machine, the computer measures the parameters of the side length of the central pore and the fiber diameter of the grid structure of the high-strength composite geotextile (2). The centroid coordinates of the first pore located at the corner point of the high-strength composite geotextile (2) close to the limiting edge (7) are measured and used as the starting reference coordinates. The above parameters are then input into the computer program, and the relative coordinates of other pores are output, thereby achieving precise positioning of the pores of the entire high-strength composite geotextile (2). The limiting laying method uses two orthogonal edges on the needle punching machine laying surface (5) as limiting edges (7). The right-angled boundaries of the first bio-fiber geotextile (1) and the high-strength composite geotextile (2) are aligned with the limiting edges (7) and laid on the needle punching machine laying surface (5). The first bio-fiber geotextile (1) and the high-strength composite geotextile (2) are fixed with the edge presser (6).

2. A method for preparing a self-healing high-strength composite geotextile based on MICP technology, characterized in that: Includes the following steps: (I) Preparation of the first bio-fiber geotextile (1); using animal fur fiber, plant stem and leaf fiber and synthetic fiber as raw materials, the first bio-fiber geotextile (1) is formed by needle punching process. (II) Preparation of high-strength composite geotextile (2): High-strength warp fibers (2-1), high-strength weft fibers (2-2) and polypropylene fibers (2-3) are woven together by warp and weft crossing and overlapping, and then heat-bonded at the intersection to make high-strength composite geotextile (2). (III) Align the right-angled boundary of the first bio-fiber geotextile (1) with the limiting edge (7) of the needle punching machine, lay it on the mesh laying surface (5) of the needle punching machine, then align the right-angled boundary of the high-strength composite geotextile (2) with the limiting edge (7) of the needle punching machine, lay it on the first bio-fiber geotextile (1), and fix the two layers of geotextile with the edge presser (6); use the grid positioning method to obtain the coordinates of all pore areas of the high-strength composite geotextile (2) as the needle punching area; (IV) The raw materials of the second bio-fiber geotextile (3), namely animal fur fiber, plant stem and leaf fiber and synthetic fiber, are laid on the high-strength composite geotextile (2) after being filament-woven into a web, and the second bio-fiber geotextile (3) is formed by needle punching. (V) Prepare a mixed solution of Bacillus pasteurellii, urea and calcium chloride, spray it evenly on the surface of the sewn self-healing high-strength composite geotextile and let it dry. Step (VI): Apply polyvinyl alcohol (PVA) coating liquid to the surface of self-healing high-strength composite geotextile using a coating machine to form a PVA water-soluble slow-release film (4). The high-strength composite geotextile (2) formed in step (II) is woven with polypropylene fibers (2-3) between adjacent high-strength warp fibers (2-1) and adjacent high-strength weft fibers (2-2). The high-strength warp fibers (2-1), high-strength weft fibers (2-2) and polypropylene fibers (2-3) have pores between each other, and the longitudinal high-strength warp fibers (2-1) and polypropylene fibers (2-3) are evenly arranged, and the transverse high-strength weft fibers (2-2) and polypropylene fibers (2-3) are evenly arranged, so that the size of the central pores of each grid structure of the self-healing high-strength composite geotextile is the same, and the size of the central pores meets the requirement that most of the mud and sand can be prevented from passing through in its application environment. In step (IV), during needle punching, the needle passes through the central pore of the grid structure of the high-strength composite geotextile (2), entangles the fibers of the second bio-fiber geotextile (3) near the needle with the fibers of the first bio-fiber geotextile (1), and while making the second bio-fiber geotextile (3), restricts the position of the high-strength composite geotextile (2) and makes the three-layer geotextile structure form an integral structure.

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