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

Abstract

The invention discloses self-repairing high-strength composite geotechnical cloth based on an MICP technology and a preparation method. The self-repairing high-strength composite geotechnical cloth is composed of first bio-fiber geotechnical cloth, high-strength composite geotechnical cloth and second bio-fiber geotechnical cloth which are sequentially arranged from bottom to top. The first bio-fiber geotextile consists of animal fur fibers, plant stem and leaf fibers and synthetic fibers, and is processed and formed by a needling process; the high-strength composite geotechnical cloth is composed of high-strength warp yarn fibers, high-strength weft yarn fibers and polypropylene fibers, and the high-strength warp yarn fibers, the high-strength weft yarn fibers and the polypropylene fibers are interwoven to form a groined structure in a warp-weft crossing and up-down overlapping Central pores of each #-shaped structure formed by the high-strength warp fibers, the high-strength weft fibers and the polypropylene fibers of the high-strength composite geotechnical cloth are uniform and consistent in size; the second bio-fiber geotextile is formed by needling animal fur fibers, plant stem and leaf fibers and synthetic fibers, penetrating through a central pore of the #-shaped structure of the high-strength composite geotextile and connecting with the fibers of the first bio-fiber geotextile.

Description

Technical Field

[0001] The present invention relates to the technical field of geotextiles, and in particular to a self-repairing high-strength composite geotextile based on MICP technology and a preparation method thereof, which can be used to reinforce and protect slope projects in water environments such as seawalls, riverbanks, and lakebanks, and at the same time, bioreinforce engineering structures such as fill or masonry blocks of the slopes using biosolidification technology. Background Art

[0002] With the continuous development of engineering technology and the continuous construction of infrastructure in my country, geotextile, another new type of engineering material after wood, steel and concrete, has been widely used in foundation pit engineering, road engineering, coastal engineering, sewage treatment plants, landfills and other projects, and plays a vital role. In the slope engineering in the water environment such as seawalls, river embankments and lake embankments, the engineering role of geotextile is: first, the reinforcement effect, which plays a role in strengthening and protecting embankments and slopes; second, the anti-filtration effect, which allows liquids (such as seawater, groundwater, etc.) to pass through while keeping the soil particles under the influence of osmotic pressure from being lost.

[0003] In fact, with the continuous development of construction projects, slope projects in water environments require geotextiles with higher strength, longer service life and self-repairing ability to better protect engineering structures. At the same time, they can use the bio-solidification process to achieve self-reinforcement and long-term use of structures, reducing later maintenance costs. However, the existing general geotextiles cannot meet the above requirements and have the following shortcomings: 1. Poor mechanical strength, especially poor tensile strength and tear strength, prone to holes, cracks and other undesirable phenomena in a variety of use environments; 2. Insufficient service life, simple structural composition, lack of fiber components with high life and good environmental tolerance; 3. No self-repairing ability, unable to self-reinforce and repair engineering structures during use, thereby unable to reduce later maintenance or reconstruction costs.

[0004] Therefore, in order to meet the growing construction requirements, a composite geotextile with high strength, long life and certain self-repairing ability is urgently needed to address the problems of insufficient strength, insufficient service life and no self-repairing ability of general geotextiles. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is to provide a self-repairing high-strength composite geotextile based on MICP technology and a preparation method thereof. On the one hand, the tensile strength of the self-repairing high-strength composite geotextile is improved and its strength is kept uniform, so that it can effectively resist the damage of loads in the environment and prevent most slope sliding in its application environment; on the other hand, the good water permeability and anti-filtration functions of the self-repairing high-strength composite geotextile are ensured, so that it can resist most infiltration erosion in its application environment.

[0007] (II) Technical solution

[0008] The solution adopted by the present invention to solve the above technical problems is a self-repairing high-strength composite geotextile based on MICP technology, a self-repairing high-strength composite geotextile based on MICP technology, including a self-repairing high-strength composite geotextile; the self-repairing high-strength composite geotextile is composed of a first biofiber geotextile, a high-strength composite geotextile, and a second biofiber geotextile arranged in sequence from bottom to top;

[0009] The first biofiber geotextile is composed of animal fur fibers, plant stem and leaf fibers, and synthetic fibers, and is formed by a needle punching process;

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

[0011] The second biofiber geotextile is formed by needle-punching animal fur fibers, plant stem and leaf fibers and synthetic fibers, passing through the central pores of the tic-tac-toe structure of the high-strength composite geotextile, and connecting with the fibers of the first biofiber geotextile.

[0012] In some embodiments, the synthetic fibers in the first biofiber geotextile and the second biofiber geotextile 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 Gramineae crops; all the fibers of the above-mentioned biofiber geotextiles are mixed and processed into shape by a needle punching process, and the forming thickness of each layer of biofiber geotextile is about 3-4mm, so that it has the water permeability and anti-filtration functions of general needle-punched geotextiles, and the gradual decomposition of biofibers can provide nitrogen fertilizer and carbon source for the solidification effect of microorganisms for a long time.

[0013] In some embodiments, the ratio of the high-strength warp yarn fiber, the high-strength weft yarn fiber and the polypropylene fiber is 1:1:6; the high-strength warp yarn fiber and the high-strength weft yarn fiber are both ultra-high molecular weight polyethylene (UHMWPE) filament fibers, and the polypropylene fiber is polypropylene filament fibers; the tensile strength of the ultra-high molecular weight polyethylene (UHMWPE) filament fibers used is about 3000-3500MPa, and the tensile strength of the polypropylene filament fibers used is about 1000-1500MPa, and the service life of both in application environments such as embankment slopes is at least 50 years, while the tensile strength of polyester fibers, polyamide fibers and polypropylene staple fibers used in most geotextiles is generally between 500-800MPa, 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 tic-tac-toe structures is 4 mm.

[0015] By adopting the above scheme, in the self-repairing high-strength composite geotextile, the high-strength composite geotextile has improved mechanical strength and service life; the first biofiber geotextile and the second biofiber geotextile carry the substances required for microbial solidification, which play a role in biological reinforcement of geotechnical structures such as slope filling, masonry blocks and other geotechnical structures on both sides of the geotextile.

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

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

[0018] By adopting the above scheme, the self-healing high-strength composite geotextile based on MICP technology is applied to slope projects in water environments such as seawalls, riverbanks, and lakebanks. It is required to avoid water erosion during the construction period, which may cause the loss of biosolidified substances on the geotextile; 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 the first biofiber geotextile and the second biofiber geotextile is no less than 40%.

[0020] In some embodiments, the content of synthetic fibers in the first biofiber geotextile and the second biofiber geotextile is about 40%, and the rest is a random mixture of animal fur fibers and plant stem and leaf fibers, with a content of about 60%.

[0021] By adopting the above solution, the mechanical strength of the first biofiber geotextile and the second biofiber geotextile can be ensured.

[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 fibers are the matrix, and the proportion is not less than 60%.

[0023] By adopting the above scheme, the polypropylene fiber is the matrix, and the proportion is not less than 60% to ensure the strength of the high-strength composite geotextile; the high-strength warp fiber and the high-strength weft fiber can play a reinforcing role, and the density of the high-strength warp fiber and the high-strength weft fiber can be specifically determined according to the reinforcement requirements.

[0024] In some embodiments, the high-strength composite geotextile is fixed in place after the fibers of the second biofiber geotextile are connected to the first biofiber geotextile through needle-punching; and, after weaving, the high-strength composite geotextile can be treated with a thermal bonding process to bond the three types of fibers, namely, high-strength warp fibers, high-strength weft fibers and polypropylene fibers, together at the intersection nodes.

[0025] By adopting the above scheme, the three fibers, namely, high-strength warp yarn fiber, high-strength weft yarn fiber and polypropylene fiber, are bonded together at the intersection nodes through a thermal bonding process, so that the three fibers can be fixed together without slipping to maintain the stability of the central pore size.

[0026] In some embodiments, when the fibers of the second biofiber geotextile are needle-punched and pass through the central pores of the tic-tac-toe structure of the high-strength composite geotextile, avoiding the fibers of the high-strength composite geotextile can be achieved by a grid positioning method;

[0027] The grid positioning method is to use the mesh surface of the needle punching machine as a two-dimensional coordinate system, and after the first biofiber geotextile and the high-strength composite geotextile are sequentially limited and laid on the needle punching machine, the parameters of the central pore side length and fiber diameter of the tic-tac-toe structure of the high-strength composite geotextile are measured by computer, and the centroid coordinates of the first pore located at the corner point of the high-strength composite geotextile close to the limited edge are measured and used as the starting reference coordinates, and then the above parameters are input into the computer program, and the relative coordinates of other pores are output, so as to realize the precise positioning of the pores of the whole high-strength composite geotextile;

[0028] The limited laying is to use two orthogonal edges on the needle punching machine's laying surface as limited edges, align the right-angled boundaries of the first biofiber geotextile and the high-strength composite geotextile with the limited edges and lay them on the needle punching machine's laying surface, and fix the first biofiber geotextile and the high-strength composite geotextile with a edge press.

[0029] By adopting the above scheme, after the central pores of the high-strength composite geotextile are located by the grid positioning method, the fibers of the second biofiber geotextile are needle-punched to pass through the central pores of the tic-tac-toe structure of the high-strength composite geotextile, avoiding the fibers of the high-strength composite geotextile, and connected with the fibers of the first biofiber geotextile, thereby limiting and fixing the high-strength composite geotextile while forming.

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

[0031] (I) preparing a first biofiber geotextile; using animal fur fibers, plant stem and leaf fibers and synthetic fibers as raw materials, and forming the first biofiber geotextile through a needle punching process;

[0032] (II) preparing a high-strength composite geotextile; using a warp knitting machine to weave high-strength warp yarn fibers, high-strength weft yarn fibers and polypropylene fibers together in a manner of warp and weft crossing and overlapping each other, and then subjecting the cross nodes to thermal bonding treatment to prepare a high-strength composite geotextile;

[0033] (III) aligning the right-angle boundary of the first biofiber geotextile with the limiting edge of the needle punching machine, laying it on the net surface of the needle punching machine, and then aligning the right-angle boundary of the high-strength composite geotextile with the limiting edge of the needle punching machine, laying it on the first biofiber geotextile, and fixing the two layers of geotextiles with a clamp; using a 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 biofiber geotextile, animal fur fibers, plant stem and leaf fibers and synthetic fibers are spun into a web and laid on the high-strength composite geotextile, and the second biofiber geotextile is formed by needle punching;

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

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

[0037] In some embodiments, during the acupuncture in step (IV), the needle passes through the central pore of the tic-tac-toe structure of the high-strength composite geotextile, and the fibers of the second biofiber geotextile near the needle are entangled with the fibers of the first biofiber geotextile. While forming the second biofiber geotextile, the position of the high-strength composite geotextile is restricted, and the three-layer geotextile structure forms an integral structure.

[0038] In some embodiments, the invention further comprises step (VI), wherein a polyvinyl alcohol (PVA) coating liquid is coated on the surface of the self-repairing high-strength composite geotextile using a coating machine to form a layer of PVA water-soluble slow-release film.

[0039] In some embodiments, the PVA water-soluble slow-release film is made of polyvinyl alcohol (PVA) coating liquid and is coated on the surface of the self-repairing high-strength composite geotextile using a coating machine, and the thickness of the formed PVA water-soluble slow-release film is about 1 mm.

[0040] (III) Beneficial effects

[0041] Compared with the prior art, the present invention designs a self-repairing high-strength composite geotextile based on MICP technology and a preparation method thereof.

[0042] (1) The present invention has a scientific and reasonable composition structure and weaving process. On the one hand, the tensile strength of the self-repairing high-strength composite geotextile is improved, and its strength is kept uniform, which can effectively resist the damage of the load in the environment and prevent the slope sliding in most of its application environments; on the other hand, it ensures the good water permeability and anti-filtration function of the self-repairing high-strength composite geotextile, and can resist most of the infiltration erosion in its application environment;

[0043] (2) The high-strength and long-life materials used in the present invention can adapt to the water environment of seawalls, riverbanks, lake embankments and other projects, have good environmental tolerance, and have a longer service life than general geotextiles, reducing the subsequent maintenance costs and being more economical;

[0044] (3) The present invention adopts common warp knitting technology and needle punching technology to sew, which is easy to realize the mass production of self-repairing high-strength composite geotextiles; no binding fiber is required when the three-layer geotextile structure is composited, saving production costs; and positioning pore needle punching is adopted to achieve the strength and service life of the original high-strength composite geotextile when the three-layer structure is composited and connected;

[0045] (4) The present invention has biological self-repairing ability. After laying, the biological solidification reaction starts, and the earth filling, masonry blocks and other geotechnical structures on both sides of the geotextile can be gradually reinforced; the biofiber geotextile used in the present invention has the water permeability and anti-filtration functions of the 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) The present invention is applied to seawalls, riverbanks, lake embankments and other slope projects in water environments, and when a PVA water-soluble slow-release film is applied, the present invention can control the start time of the biosolidification effect. When the PVA water-soluble slow-release film is laid, it can effectively prevent seawater from infecting the geotextile and causing the loss of bacteria and substances for biosolidification, and has a scientific and reasonable function;

[0047] (6) The dissolved and degraded products of the PVA water-soluble sustained-release film used in the present invention are clean and pollution-free, and will not cause damage to the environment, which is in line with the concept of green development; in addition, the animal fur fibers and plant stem and leaf fibers used in the present invention are mainly derived from waste produced by agriculture and animal husbandry, which realizes the resource recycling of waste and is in line with the concept of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 This is a schematic structural diagram of a self-repairing high-strength composite geotextile based on MICP technology of the present invention;

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

[0051] Figure 3 It is a schematic plan view of the limiting paving of the needling machine of the present invention.

[0052] The names of the components corresponding to the various figure marks in the figure are: 1. The first biofiber geotextile; 2. High-strength composite geotextile; 2-1. High-strength warp fiber; 2-2. High-strength weft fiber; 2-3. Polypropylene fiber; 3. The second biofiber geotextile; 4. PVA water-soluble sustained-release film; 5. Needle punching machine mesh surface; 6. Edge press; 7. Limiting edge; L is the side length of the central pore of the tic-tac-toe structure. DETAILED DESCRIPTION

[0053] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0056] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an 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 aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0057] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0058] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0059] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0060] like Figure 1-Figure 3As shown, the present invention provides a self-repairing high-strength composite geotextile based on MICP technology, including a self-repairing high-strength composite geotextile; the self-repairing high-strength composite geotextile is composed of a first biofiber geotextile 1, a high-strength composite geotextile 2, and a second biofiber geotextile 3 arranged in sequence from bottom to top; the first biofiber geotextile 1 is composed of animal fur fibers, plant stem and leaf fibers, and synthetic fibers, and is formed by a 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 The fiber 2-1, the high-strength weft yarn fiber 2-2 and the polypropylene fiber 2-3 are interwoven with each other in a tic-tac-toe structure in a manner of crossing the warp and weft and overlapping up and down; and the central pores of each tic-tac-toe structure formed by the high-strength warp yarn fibers 2-1, the high-strength weft yarn fibers 2-2 and the polypropylene fiber 2-3 of the high-strength composite geotextile 2 are uniform and consistent in size; the second biofiber geotextile 3 is made of animal fur fibers, plant stem and leaf fibers and synthetic fibers that are needle-punched through the central pores of the tic-tac-toe structure of the high-strength composite geotextile 2 and are connected with the fibers of the first biofiber geotextile 1 to form a shape. In some embodiments, the synthetic fibers in the first biofiber geotextile 1 and the second biofiber 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 Gramineae crops; all the fibers of the above-mentioned biofiber geotextiles are mixed and formed by a needle punching process, and the forming thickness of each layer of the biofiber geotextile is 4 mm, so that it has the water permeability and anti-filtration functions of a general needle-punched geotextile, and the gradual decomposition of the biofiber can provide nitrogen fertilizer and carbon source for the solidification effect of microorganisms for a long time. In some embodiments, the ratio of the high-strength warp yarn fiber 2-1, the high-strength weft yarn fiber 2-2 and the polypropylene fiber 2-3 is 1:1:6; the high-strength warp yarn fiber 2-1 and the high-strength weft yarn fiber 2-2 are both made of ultra-high molecular weight polyethylene (UHMWPE) filament fibers, and the polypropylene fiber 2-3 is made of polypropylene filament fibers; the tensile strength of the ultra-high molecular weight polyethylene (UHMWPE) filament fibers used is about 3000-3500MPa, and the tensile strength of the polypropylene filament fibers used is about 1000-1500MPa, and the service life of both in application environments such as embankment slopes is at least 50 years, while the tensile strength of polyester fibers, polyamide fibers and polypropylene staple fibers used in most geotextiles is generally between 500-800MPa, 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 tic-tac-toe structures is 4 mm.By adopting the above scheme, in the self-repairing high-strength composite geotextile, the high-strength composite geotextile 2 has improved mechanical strength and service life; the first biofiber geotextile 1 and the second biofiber geotextile 3 carry the substances required for microbial solidification, which play a role in biological reinforcement of geotechnical structures such as slope filling, masonry blocks and other geotechnical structures on both sides of the geotextile.

[0061] In some embodiments, the outer surface of the self-repairing 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, the two outer surfaces of the self-repairing high-strength composite geotextile located above and below are covered with a layer of PVA water-soluble slow-release film 4. Using the above scheme, the self-repairing high-strength composite geotextile based on MICP technology is applied to slope projects in water environments such as seawalls, river embankments, and lake embankments. It is required to avoid water erosion during the construction period to cause the loss of biosolidified substances on the geotextile; therefore, the setting of the PVA water-soluble slow-release film 4 can prevent the loss of microbial solidified substances caused by water erosion during construction.

[0062] In some embodiments, in some embodiments, the content of synthetic fibers in the first biofiber geotextile 1 and the second biofiber geotextile 3 is about 40%, and the rest is a random mixture of animal fur fibers and plant stem and leaf fibers, with a content of about 60%. By adopting the above scheme, the mechanical strength of the first biofiber geotextile 1 and the second biofiber geotextile 3 can be ensured.

[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 the proportion is not less than 60% to ensure the strength of the high-strength composite geotextile 2; and the high-strength warp fibers 2-1 and the high-strength weft fibers 2-2 can play a reinforcing role, and the density of the high-strength warp fibers 2-1 and the 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 connected to the first biofiber geotextile 1 by needle-punching the fibers of the second biofiber geotextile 3 and then fixed in position; and the high-strength composite geotextile 2 can be treated with a thermal bonding process after weaving to bond the three fibers of high-strength warp fibers 2-1, high-strength weft fibers 2-2 and polypropylene fibers 2-3 together at the intersection nodes. With the above scheme, 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 by a thermal bonding process, so that the three fibers can be fixed together without slipping, so as to maintain the stability of the central pore size.

[0065] In some embodiments, when the fibers of the second biofiber geotextile 3 are needle-punched and pass through the central pores of the tic-tac-toe structure of the high-strength composite geotextile 2, they avoid the fibers of the high-strength composite geotextile 2, which can be achieved by a grid positioning method; the grid positioning method uses the needle-punching machine laying surface 5 as a two-dimensional coordinate system, and after the first biofiber geotextile 1 and the high-strength composite geotextile 2 are sequentially laid on the needle-punching machine, the computer measures the parameters of the central pore side length and fiber diameter of the tic-tac-toe structure of the high-strength composite geotextile 2, and measures the position of the high-strength composite geotextile 2 close to the high-strength composite geotextile 2. The centroid coordinates of the first pore on the corner point of the limiting edge 7 are used as the starting reference coordinates, and then the above parameters are input into the computer program to output the relative coordinates of other pores, so as to realize the precise positioning of the pores of the whole high-strength composite geotextile 2; the limiting laying is to use the two orthogonal edges on the needle loom paving surface 5 as the limiting edges 7, align the right-angled boundaries of the first biofiber geotextile 1 and the high-strength composite geotextile 2 with the limiting edges 7 and lay them on the needle loom paving surface 5, and fix the first biofiber geotextile 1 and the high-strength composite geotextile 2 with the edge press 6. With the above scheme, after the central pores of the high-strength composite geotextile 2 are located by the grid positioning method, the fibers of the second biofiber geotextile 3 are needle-punched, pass through the central pores of the tic-tac-toe structure of the high-strength composite geotextile 2, avoid the fibers of the high-strength composite geotextile 2, and connect with the fibers of the first biofiber geotextile 1, and the high-strength composite geotextile 2 is fixed while being formed.

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

[0067] (I) preparing a first biofiber geotextile 1; using feathers of poultry animals, fur of livestock (pigs, cattle, sheep, etc.), stem fibers of gramineous crops and polyester fibers as raw materials, and forming the first biofiber geotextile 1 by needle punching process, with a thickness of 4 mm;

[0068] (II) preparing a high-strength composite geotextile 2; selecting ultra-high molecular weight polyethylene (UHMWPE) filament fibers as high-strength warp fibers 2-1 and high-strength weft fibers 2-2, and selecting polypropylene filament fibers as polypropylene fibers 2-3; using a warp knitting machine to weave the high-strength warp fibers 2-1, high-strength weft fibers 2-2, and polypropylene fibers 2-3 together in a manner of warp and weft crossing and overlapping up and down, and then subjecting the intersections to thermal bonding treatment to prepare a high-strength composite geotextile 2;

[0069] (III) aligning the right-angle boundary of the first biofiber geotextile 1 with the limiting edge 7 of the needle punching machine, laying it on the net surface 5 of the needle punching machine, and then aligning the right-angle boundary of the high-strength composite geotextile 2 with the limiting edge 7 of the needle punching machine, laying it on the first biofiber geotextile 1, and fixing the two layers of geotextiles with the edge clamp 6; using 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 biofiber geotextile 3, poultry feathers, livestock (pigs, cattle, sheep, etc.) fur, stem fibers of gramineous crops and polyester fibers are spun into a web and laid on the high-strength composite geotextile 2, and the second biofiber geotextile 3 is formed by needle punching, and the thickness is 4 mm; the needle punching process also connects the fibers of the second biofiber geotextile 3 and the first biofiber geotextile 1 together, and the high-strength composite geotextile 2 is fixed in position;

[0071] (V) preparing a mixed solution of Bacillus pasteurianus, urea and calcium chloride, spraying the solution evenly on the surface of the sewn self-repairing high-strength composite geotextile and drying the solution;

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

[0073] The mixed solution has the following proportions: the mixed solution comprises a binder and a bacterial solution, which are mixed in a volume ratio of 1:1; the binder is a mixture of 1 mol / L urea solution and 1 mol / L calcium chloride solution in a ratio of 1:1; the bacterial solution uses Bacillus pasteurianus 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; gaps are left between the high-strength warp fibers 2-1, high-strength weft fibers 2-2 and polypropylene fibers 2-3, 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 central pores of each tic-tac-toe structure of the self-repairing high-strength composite geotextile are the same in size, and the size of the central pores is sufficient to prevent most mud and sand from passing through in its application environment.

[0075] In some embodiments, during the acupuncture in step (IV), the needle passes through the central pore of the tic-tac-toe structure of the high-strength composite geotextile 2, and the fibers of the second biofiber geotextile 3 near the needle are entangled with the fibers of the first biofiber geotextile 1. While forming the second biofiber geotextile 3, the position of the high-strength composite geotextile 2 is restricted, and the three-layer geotextile structure forms an integral structure.

[0076] In some embodiments, the PVA water-soluble slow-release film 4 is made of polyvinyl alcohol (PVA) coating liquid and is coated on the surface of the self-repairing 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-repairing high-strength composite geotextile based on MICP technology in the above embodiment, but it is not limited to this: the self-repairing high-strength composite geotextile based on MICP technology is transported from the factory to the embankment construction site, and the slope area to be laid is leveled, and then the self-repairing high-strength composite geotextile based on MICP technology is laid to the area; during the construction process, the overlap between each two geotextiles is required to be greater than 10 cm; during the construction process, the slope undergoes slight deformation, and the laid self-repairing high-strength composite geotextile based on MICP technology Repair the tiny deformation in the adaptive engineering of high-strength composite geotextile, ensure that the geotextile fits tightly with the slope fill, and make the protection, filtration and biological self-repair functions of the geotextile work normally; after laying, lay a gravel cushion layer on the geotextile, build and bury blocks, etc.; during the construction process, the PVA water-soluble slow-release film slowly dissolves, temporarily resisting the erosion of the geotextile by water flow, and after completion, the film is basically dissolved, and water penetrates into the geotextile, triggering a biological curing (MICP) reaction, and reinforcing the structures on both sides of the geotextile.

[0078] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0079] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A self-repairing high-strength composite geotextile based on MICP technology, characterized by: It comprises a self-repairing high-strength composite geotextile; the self-repairing high-strength composite geotextile is composed of a first biofiber geotextile (1), a high-strength composite geotextile (2), and a second biofiber geotextile (3) which are arranged in sequence from bottom to top; The first biofiber geotextile (1) is composed of animal fur fibers, plant stem and leaf fibers, and synthetic fibers, and is formed by a 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) are interwoven with each other in a manner of warp and weft crossing and overlapping up and down to form a tic-tac-toe structure; and the central pores of each tic-tac-toe 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 biofiber geotextile (3) is formed by needle-punching animal fur fibers, plant stem and leaf fibers, and synthetic fibers, passing through the central pores of the tic-tac-toe structure of the high-strength composite geotextile (2), and connecting with the fibers of the first biofiber geotextile (1).

2. The self-repairing high-strength composite geotextile based on MICP technology according to claim 1, characterized in that: The outer surface of the self-repairing high-strength composite geotextile is covered with a layer of PVA water-soluble slow-release film (4).

3. The self-repairing high-strength composite geotextile based on MICP technology according to claim 1, characterized in that: The proportion of synthetic fibers in the first biofiber geotextile (1) and the second biofiber geotextile (3) is no less than 40%.

4. The self-repairing high-strength composite geotextile based on MICP technology according to claim 1, characterized in that: 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 the proportion thereof is not less than 60%.

5. The self-repairing high-strength composite geotextile based on MICP technology according to claim 1, characterized in that: The high-strength composite geotextile (2) is connected to the first biofiber geotextile (1) by needle-punching the fibers of the second biofiber geotextile (3) and then fixed in position; and the high-strength composite geotextile (2) can be treated with a thermal bonding process after weaving, so that the three types of fibers, namely, the high-strength warp fibers (2-1), the high-strength weft fibers (2-2) and the polypropylene fibers (2-3), are bonded together at the intersection nodes.

6. The self-repairing high-strength composite geotextile based on MICP technology according to claim 1, characterized in that: When the fibers of the second biofiber geotextile (3) are needle-punched and pass through the central pores of the tic-tac-toe structure of the high-strength composite geotextile (2), they avoid the fibers of the high-strength composite geotextile (2), which can be achieved by a grid positioning method; The grid positioning method is to use the needle loom surface (5) as a two-dimensional coordinate system, and after the first biofiber geotextile (1) and the high-strength composite geotextile (2) are sequentially limited and laid on the needle loom, the parameters of the central pore side length and fiber diameter of the tic-tac-toe structure of the high-strength composite geotextile (2) are measured by computer, and the centroid coordinates of the first pore located at the corner point of the high-strength composite geotextile (2) close to the limited edge (7) are measured and used as the starting reference coordinates, and then the above parameters are input into the computer program, and the relative coordinates of other pores are output, so as to realize the precise positioning of the pores of the entire high-strength composite geotextile (2); The limited laying method is to use two orthogonal edges on the needle loom surface (5) as limited edges (7), align the right-angled boundaries of the first biofiber geotextile (1) and the high-strength composite geotextile (2) with the limited edges (7) and lay them on the needle loom surface (5), and use a pressure device (6) to fix the first biofiber geotextile (1) and the high-strength composite geotextile (2).

7. A method for preparing a self-repairing high-strength composite geotextile based on MICP technology, characterized in that: The following steps are involved: (I) preparing a first biofiber geotextile (1); using animal fur fibers, plant stem and leaf fibers and synthetic fibers as raw materials, and forming the first biofiber geotextile (1) through a needle punching process; (II) preparing a high-strength composite geotextile (2); using a warp knitting machine to weave high-strength warp yarn fibers (2-1), high-strength weft yarn fibers (2-2) and polypropylene fibers (2-3) together in a manner of warp and weft crossing and overlapping each other, and then subjecting the cross nodes to thermal bonding treatment to prepare a high-strength composite geotextile (2); (III) aligning the right-angled boundary of the first biofiber geotextile (1) with the limiting edge (7) of the needle punching machine and laying it on the net surface (5) of the needle punching machine, and then aligning the right-angled boundary of the high-strength composite geotextile (2) with the limiting edge (7) of the needle punching machine and laying it on the first biofiber geotextile (1), and fixing the two layers of geotextiles with a clamp (6); using a 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 biofiber geotextile (3), animal fur fibers, plant stem and leaf fibers and synthetic fibers, are spun into a web and laid on the high-strength composite geotextile (2), and the second biofiber geotextile (3) is formed by needle punching; (V) Prepare a mixed solution of Bacillus pasteurianus, urea and calcium chloride, spray it evenly on the surface of the sewn self-repairing high-strength composite geotextile and let it dry.

8. The method for preparing a self-repairing high-strength composite geotextile based on MICP technology according to claim 7, characterized in that: The high-strength composite geotextile (2) formed in step (II); polypropylene fibers (2-3) are woven between adjacent high-strength warp fibers (2-1) and adjacent high-strength weft fibers (2-2); gaps are left between the high-strength warp fibers (2-1), the high-strength weft fibers (2-2) and the polypropylene fibers (2-3), and the high-strength warp fibers (2-1) and the polypropylene fibers (2-3) are evenly arranged in the longitudinal direction, and the high-strength weft fibers (2-2) and the polypropylene fibers (2-3) are evenly arranged in the transverse direction, so that the central pores of each tic-tac-toe structure of the self-repairing high-strength composite geotextile have the same size, and the size of the central pores is sufficient to prevent most mud and sand from penetrating in its application environment.

9. The method for preparing a self-repairing high-strength composite geotextile based on MICP technology according to claim 7, characterized in that: During the acupuncture in step (IV), the needle penetrates the central pore of the tic-tac-toe structure of the high-strength composite geotextile (2), and the fibers of the second biofiber geotextile (3) near the needle are entangled with the fibers of the first biofiber geotextile (1). While the second biofiber geotextile (3) is formed, the position of the high-strength composite geotextile (2) is restricted, and the three-layer geotextile structure forms an integral structure.

10. The method for preparing the self-repairing high-strength composite geotextile based on MICP technology according to claim 7, characterized in that: The method also includes step (VI), wherein a polyvinyl alcohol (PVA) coating liquid is coated on the surface of the self-repairing high-strength composite geotextile using a coating machine to form a layer of PVA water-soluble slow-release film (4).

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