Composite geotextile base material and self-repairing high-strength composite geotextile

Abstract

The utility model discloses a composite geotechnical cloth base material and self-repairing high-strength composite geotechnical cloth. The self-repairing high-strength composite geotechnical cloth comprises the self-repairing high-strength composite geotechnical cloth, the self-repairing high-strength composite geotechnical cloth is composed of first bio-fiber geotechnical cloth, a composite geotechnical cloth base material and second bio-fiber geotechnical cloth which are sequentially arranged from bottom to top. The composite geotextile base material comprises a plurality of #-shaped structures formed by interweaving a plurality of warps and a plurality of wefts which are arranged at the same distance in a warp and weft crossing and up-down overlapping mode. The warps comprise first warps and second warps; the wefts comprise first wefts and second wefts; n second warps are arranged among the first warps; n second wefts are arranged among the first wefts. According to the self-repairing high-strength composite geotechnical cloth, the tensile strength of the self-repairing high-strength composite geotechnical cloth is improved, the strength of the self-repairing high-strength composite geotechnical cloth is kept uniform, damage of loads in the environment can be effectively resisted, and most side slopes in the application environment are prevented from sliding.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of geotextile, especially to composite geotextile substrate and self-repairing high-strength composite geotextile, which can be used for reinforcing and protecting the side slope engineering in water environment such as sea embankment, river embankment and lake embankment, and simultaneously using biological solidification technology to biologically reinforce the filling or grouting block stone engineering structures of the side slope. BACKGROUND

[0002] With the continuous development of engineering technology and the continuous construction of infrastructure, after wood, steel and concrete, another new type of engineering material, geotextile, is widely used in foundation pit engineering, road engineering, coastal engineering, sewage treatment field, garbage landfill field and other various engineering, and plays a vital role. In the side slope engineering in water environment such as sea embankment, river embankment and lake embankment, the engineering role of geotextile is: first, the reinforcement effect plays a reinforcing and protecting role for embankment, side slope and the like; second, the reverse filtration effect makes the liquid (such as seawater, groundwater and the like) permeate while keeping the soil particles under the action of osmotic pressure from being lost.

[0003] In fact, with the continuous development of construction engineering, the side slope engineering in water environment needs geotextile with higher strength, longer service life and self-repairing ability to better protect the engineering structures, and at the same time, the biological solidification process can be used to realize the self-reinforcement and long-term use of the structures and reduce the maintenance cost in the later period. However, the existing general geotextile cannot meet the above requirements and has the following shortcomings: 1. Poor mechanical strength, especially poor tensile strength and tear resistance, which is prone to holes, cracks and other adverse phenomena in various use environments; 2. Insufficient service life, simple structure, lack of high-life and environmentally resistant fiber components; 3. No self-repairing ability, unable to reinforce and repair the engineering structures during use, thereby unable to reduce the maintenance or reconstruction cost in the later period.

[0004] Therefore, in order to meet the increasing construction requirements, in view of the problems of insufficient strength, insufficient service life and no self-repairing ability of general geotextile, there is an urgent need for a composite geotextile with high strength, long service life and certain self-repairing ability. UTILITY MODEL CONTENT

[0005] (I) Technical problem to be solved

[0006] The technical problems to be solved by the utility model are to provide a composite geotextile base material and a self-repairing high-strength composite geotextile, on the one hand, the tensile strength of the self-repairing high-strength composite geotextile is improved, and the strength is uniform, which can effectively resist the damage of the load in the environment and prevent most of the slope sliding in the application environment; on the other hand, the self-repairing high-strength composite geotextile guarantees good water permeability and reverse filtration function, and can resist most of the penetration erosion in the application environment.

[0007] (II) Technical solutions

[0008] The utility model adopts the scheme of composite geotextile base material to solve the above technical problems, the composite geotextile base material includes multiple warp threads and multiple weft threads arranged at the same distance in the way of warp-weft crossing and up-down overlapping, and is interwoven to form multiple well-shaped structures;The warp thread includes first warp thread and second warp thread;The weft thread includes first weft thread and second weft thread;N second warp threads are arranged between the first warp threads;N second weft threads are arranged between the first weft threads.

[0009] In some embodiments, N=3.

[0010] In some embodiments, the first warp thread is made of high-strength warp yarn fiber;The first weft thread is made of high-strength weft yarn fiber;The second warp thread and the second weft thread are both made of polypropylene fiber.

[0011] Specifically, the high-strength warp yarn fiber and the high-strength weft yarn fiber are both 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 ultra-high molecular weight polyethylene (UHMWPE) filament fiber is about 3000-3500MPa, and the tensile strength of the polypropylene filament fiber is about 1000-1500MPa, and the service life of both in the application environment such as the embankment slope is at least 50 years, while the tensile strength of the polyester fiber, the polyamide fiber and the polypropylene short fiber used in most geotextiles is usually between 500-800MPa, and the service life is less than 30 years, therefore, the tensile strength and service life of the self-repairing high-strength composite geotextile are significantly higher than those of the general geotextile.

[0012] In some embodiments, the spacing between adjacent first warp threads and second warp threads, the spacing between adjacent second warp threads and second warp threads, the spacing between adjacent first weft threads and second weft threads, and the spacing between adjacent second weft threads and second weft threads are the same;So that the center apertures of each well-shaped structure formed by the first warp thread, the second warp thread, the first weft thread and the second weft thread are uniform and have consistent size.

[0013] Specifically, three second meridians are arranged between every two adjacent first meridians; three second latitudes are arranged between every two adjacent first latitudes; then a cross-shaped structure is formed between adjacent first meridians, second meridians, first latitudes and second latitudes; a cross-shaped structure is formed between adjacent two second meridians, first latitudes and second latitudes, and a cross-shaped structure is formed between adjacent two second meridians and two second latitudes.

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

[0015] In some embodiments, the first meridians, the second meridians, the first latitudes and the second latitudes are knitted together by a warp knitting machine to form an integral structure; wherein the second meridians and the second latitudes are the matrix and the proportion is not less than 60%.

[0016] By the above scheme, the second meridians and the second latitudes are the matrix and the proportion is not less than 60%, so as to ensure the strength of the composite geotextile substrate; and the first meridians and the first latitudes can play a reinforcing role, and the density of the first meridians and the first latitudes can be determined according to the reinforcement requirement.

[0017] The utility model discloses a scheme for solving the above technical problem, and the self-repairing high-strength composite geotextile comprises a self-repairing high-strength composite geotextile; the self-repairing high-strength composite geotextile is composed of a first biological fiber geotextile, a composite geotextile substrate as described above and a second biological fiber geotextile arranged from bottom to top.

[0018] In some embodiments, the first biological fiber geotextile is made of animal fur fibers, plant stem and leaf fibers and synthetic fibers and is processed by needle punching process; the second biological fiber geotextile is made of animal fur fibers, plant stem and leaf fibers and synthetic fibers and is connected with the fibers of the first biological fiber geotextile by needle punching through the central apertures of the cross-shaped structures of the composite geotextile substrate.

[0019] In some embodiments, the content of the synthetic fibers in the first biological fiber geotextile and the second biological fiber geotextile accounts for about 40%, and the rest is any mixture of animal fur fibers and plant stem and leaf fibers, which accounts for about 60%; so as to ensure the mechanical strength of the first biological fiber geotextile and the second biological fiber geotextile.

[0020] Specifically, the synthetic fibers in the first and second bio-fiber geotextiles are polyester fibers, the animal fur fibers are mainly processed from feathers of poultry and fur of livestock (pigs, cattle, sheep, etc.), and the plant stem and leaf fibers are mainly processed from stem fibers of gramineous crops; the fibers of the above bio-fiber geotextiles are mixed and processed into the shape by needling process, and each layer of the bio-fiber geotextile has a thickness of about 3-4 mm, so that it has the water permeability and reverse filtration functions of general needled geotextiles, and the gradual decomposition of the bio-fibers can provide nitrogen fertilizer and carbon source for the solidification of microorganisms for a long time.

[0021] With the above scheme, in the self-repairing high-strength composite geotextile, the composite geotextile substrate improves the mechanical strength and service life; the first and second bio-fiber geotextiles carry the substances required for microbial solidification, and play a role in biologically reinforcing the slope filling, masonry and other earthwork structures on both sides of the geotextile.

[0022] 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.

[0023] In some embodiments, the PVA water-soluble slow-release film is made of polyvinyl alcohol (PVA) coating solution, 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.

[0024] With the above scheme, the self-repairing high-strength composite geotextile is applied to slope engineering in water environment such as seawall, river embankment and lake embankment, and it is required to avoid the loss of bio-solidified substances on the geotextile due to water erosion during 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.

[0025] In some embodiments, the composite geotextile substrate is fixed by limiting the fibers of the second bio-fiber geotextile after being connected to the first bio-fiber geotextile by needling; and the composite geotextile substrate can be treated by heat bonding process after weaving to bond the first and second warps and the first and second wefts together at the intersection nodes.

[0026] With the above scheme, the first and second warps and the first and second wefts are bonded together at the intersection nodes by heat bonding process, so that they are fixed together and cannot slip to maintain the stability of the central pore size.

[0027] In some embodiments, when the fibers of the second bio-fiber geotextile are needled and pass through the central pore of the lattice-shaped structure of the composite geotextile substrate, they can avoid the fibers of the composite geotextile substrate and be realized by grid positioning method;

[0028] The grid positioning method is that the first bio-fiber geotextile and the composite geotextile base material are sequentially positioned and laid on the needle punching machine, the parameters such as the center hole length of the cross-shaped structure of the composite geotextile base material and the fiber diameter are measured by a computer, the barycentric coordinates of the first hole at the corner point of the close-limiting edge of the composite geotextile base material are measured and taken as the starting reference coordinates, the above parameters are input into the computer program, and the relative coordinates of other holes are output, so that the hole positioning of the whole composite geotextile base material is realized.

[0029] The limiting laying is that the right-angle boundaries of the first bio-fiber geotextile and the composite geotextile base material are aligned with the limiting edges and laid on the needle punching machine, and the first bio-fiber geotextile and the composite geotextile base material are fixed by the edge press.

[0030] By the grid positioning method, the center hole of the composite geotextile base material is positioned, the fibers of the second bio-fiber geotextile are needle punched, pass through the center hole of the cross-shaped structure of the composite geotextile base material, avoid the fibers of the composite geotextile base material, are connected with the fibers of the first bio-fiber geotextile, and are formed at the same time of being limited and fixed.

[0031] The preparation method of the self-repairing high-strength composite geotextile comprises the following steps:

[0032] (I) preparing a first bio-fiber geotextile; animal fur fibers, plant stem and leaf fibers and synthetic fibers are used as raw materials to form the first bio-fiber geotextile through needle punching process;

[0033] (II) preparing a composite geotextile base material; high-strength warp fibers, high-strength weft fibers and polypropylene fibers are woven together in a warp-weft crossing and upper-lower overlapping manner by using a warp knitting machine, and then the cross nodes are subjected to hot adhesion treatment to prepare the composite geotextile base material;

[0034] (III) aligning the right-angle boundaries of the first bio-fiber geotextile with the limiting edges of the needle punching machine, laying the first bio-fiber geotextile on the needle punching machine, aligning the right-angle boundaries of the composite geotextile base material with the limiting edges of the needle punching machine, laying the composite geotextile base material on the first bio-fiber geotextile, and fixing the two layers of geotextiles by using an edge press; the coordinates of all hole regions of the composite geotextile base material are obtained by using a grid positioning method, and are taken as the needle punching region;

[0035] (IV) placing the raw materials of the second bio-fiber geotextile, animal fur fibers, plant stem and leaf fibers and synthetic fibers on the composite geotextile base material after silk arrangement and netting, and forming the second bio-fiber geotextile by needle punching;

[0036] (V) Prepare a mixed solution of Bacillus pasteurii, urea and calcium chloride, and evenly spray the mixed solution on the surface of the self-repairing high-strength composite geotextile and dry.

[0037] In some embodiments, the step (II) forms the composite geotextile substrate; the adjacent high-strength warp fibers and the adjacent high-strength weft fibers are both woven with the polypropylene fibers; the high-strength warp fibers, the high-strength weft fibers and the polypropylene fibers leave gaps between each other, and the longitudinal high-strength warp fibers and the polypropylene fibers are evenly arranged, and the transverse high-strength weft fibers and the polypropylene fibers are evenly arranged, so that the sizes of the central gaps of each cross-shaped structure of the self-repairing high-strength composite geotextile are the same, and the sizes of the central gaps meet the requirements of preventing most of the silt from penetrating in the application environment.

[0038] In some embodiments, the step (IV) is that when the needle is pierced through the central gap of the cross-shaped structure of the composite geotextile substrate, the fibers of the second biological fiber geotextile near the needle are entangled with the fibers of the first biological fiber geotextile, so that the position of the composite geotextile substrate is limited when the second biological fiber geotextile is made, and the three-layer geotextile structure forms an integral structure.

[0039] In some embodiments, the step (VI) is that a polyvinyl alcohol (PVA) coating solution is coated on the surface of the self-repairing high-strength composite geotextile by using a coating machine to form a PVA water-soluble slow-release film.

[0040] (Three) beneficial effects

[0041] Compared with the prior art, the composite geotextile substrate and the self-repairing high-strength composite geotextile,

[0042] (1) The utility model has scientific and reasonable composition structure and weaving process, on the one hand, improve the tensile strength of self-repairing high-strength composite geotextile, and make its strength keep uniformity, can effectively resist the destruction of the load in the environment, prevent most of the side slope sliding in its application environment;On the other hand, it guarantees that the self-repairing high-strength composite geotextile has good water permeability and reverse filtration function, and can resist most of the penetration erosion in its application environment.

[0043] (2) The high-strength and long-life material used in the utility model can adapt to the water environment of sea embankment, river embankment, lake embankment and other projects, has good environmental tolerance, has longer service life than general geotextile, reduces the later maintenance cost, and is more economical.

[0044] (3) The utility model discloses adopt common warp knitting technology and needle punching technology sewing, and easy to realize the batch production of self -repairing high -strength composite geotextile, need not use binding fiber when composite three -layer geotextile structure, save production cost, and adopt the positioning pore needle punching, realize when composite connection three -layer structure without destroying the strength and service life of original composite geotextile base material,

[0045] (4) The utility model discloses have biological self -repairing ability, after laying, biological solidification reaction starts, can gradually reinforce the earthwork, culvert block stone and other earthwork structures of geotextile two sides, the biological fiber geotextile used in the utility model has the water -permeable, inverse filtration function of general needle punching geotextile, and the nitrogen fertilizer and carbon source that the fiber gradually decomposes can long -term provide the solidification of microorganism,

[0046] (5) The utility model discloses be applied to the sea embankment, river embankment, lake embankment and the side slope engineering in water environment, and when PVA water -soluble slow -release film is applied, the utility model can control biological solidification effect start -up time, and PVA water -soluble slow -release film can effectively prevent seawater from infecting geotextile and causing the loss of biological solidification bacteria and substance when laying, with scientific and reasonable function,

[0047] (6) The dissolving and degradation product of PVA water -soluble slow -release film used in the utility model is clean and pollution -free, does not cause damage to the environment, meets the concept of green development, in addition, the animal fur fiber and plant stem and leaf fiber used in the utility model mainly come from the waste of agricultural and animal husbandry production, realize the resource reutilization of waste, meet the concept of energy saving and emission reduction. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0049] Figure 1 It is the weaving mode schematic view of the composite geotextile base material of embodiment one.

[0050] Figure 2 It is the structure schematic view of the self -repairing high -strength composite geotextile of embodiment two.

[0051] Figure 3 It is the plane schematic view of the needle punching machine limiting laying of embodiment two.

[0052] The component names corresponding to the various labels in the figure are: 1. First bio-fiber geotextile; 2. Composite geotextile substrate; 2-1. First warp; 2-2. Second warp; 2-3. First weft; 2-4. Second weft; 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 this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.

[0054] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; and they can be internal connections between two components.

[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 is also need to be explained that the figures provided in the following embodiments only illustrate the basic concept of the present application in a schematic way, and only the components related to the present application are shown in the figures, not the components number, shape and size when actually implemented, the actual implementation of each component type, number and proportion can be a voluntary change, and its component layout type can be more complex.

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

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

[0060] As shown in Figure 1 The present embodiment provides a composite geotextile base material 2, which comprises a plurality of warp threads and a plurality of weft threads arranged at the same distance to form a plurality of cross-shaped structures by interweaving each other in a warp-weft crossing and up-down overlapping manner; the warp threads comprise first warp threads 2-1 and second warp threads 2-2; the weft threads comprise first weft threads 2-3 and second weft threads 2-4; three second warp threads 2-2 are arranged between the first warp threads 2-1; three second weft threads 2-4 are arranged between the first weft threads 2-3. In some embodiments, the first warp threads 2-1 are made of high-strength warp yarn fibers; the first weft threads 2-3 are made of high-strength weft yarn fibers; the second warp threads 2-2 and the second weft threads 2-4 are made of polypropylene fibers. Specifically, the high-strength warp yarn fibers and the high-strength weft yarn fibers are both made of ultra-high molecular weight polyethylene (UHMWPE) filament fibers, and the polypropylene fibers are made of polypropylene filament fibers; the tensile strength of the ultra-high molecular weight polyethylene (UHMWPE) filament fibers used is about 3000-3500 MPa, the tensile strength of the polypropylene filament fibers used is about 1000-1500 MPa, and the service life of both in the application environment such as the embankment slope is at least 50 years, while the tensile strength of the polyester fibers, polyamide fibers and polypropylene short fibers used in most geotextiles 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-repairing high-strength composite geotextile 2 are significantly higher than those of general geotextiles.

[0061] In some embodiments, the spacing between adjacent first warp threads 2-1 and second warp threads 2-2, the spacing between adjacent second warp threads 2-2 and second warp threads 2-2, the spacing between adjacent first weft threads 2-3 and second weft threads 2-4, and the spacing between adjacent second weft threads 2-4 and second weft threads 2-4 are the same; so that the central apertures of each of the cross-shaped structures formed by the first warp threads 2-1, the second warp threads 2-2, the first weft threads 2-3 and the second weft threads 2-4 are uniform and have the same size. Specifically, three second warp threads 2-2 are arranged between each two adjacent first warp threads 2-1; three second weft threads 2-4 are arranged between each two adjacent first weft threads 2-3; then a cross-shaped structure is formed between adjacent first warp threads 2-1, second warp threads 2-2, first weft threads 2-3 and second weft threads 2-4; a cross-shaped structure is formed between adjacent two second warp threads 2-2, first weft threads 2-3 and second weft threads 2-4, and a cross-shaped structure is formed between adjacent two second warp threads 2-2, two second weft threads 2-4. In some embodiments, the side length of the central apertures of all the cross-shaped structures is 4mm.

[0062] In some embodiments, the first warp threads 2-1, the second warp threads 2-2, the first weft threads 2-3 and the second weft threads 2-4 are knitted together by a warp knitting machine to form an integral structure; wherein the second warp threads 2-2 and the second weft threads 2-4 are the matrix and account for not less than 60%. With the above scheme, the second warp threads 2-2 and the second weft threads 2-4 are the matrix and account for not less than 60%, so as to ensure the strength of the composite geotextile substrate 2; and the first warp threads 2-1 and the first weft threads 2-3 can play a reinforcing role, and the density of the first warp threads 2-1 and the first weft threads 2-3 can be specifically determined according to the reinforcement requirement. Embodiment two:

[0063] As shown in Figures 1-3 The present embodiment provides a self-repairing high-strength composite geotextile 2, which comprises a self-repairing high-strength composite geotextile 2; the self-repairing high-strength composite geotextile 2 is composed of a first biodegradable geotextile 1, a composite geotextile substrate 2 as described above, and a second biodegradable geotextile 3 arranged in turn from bottom to top.

[0064] In some embodiments, the first bio-fiber geotextile 1 is made of animal fur fibers, plant stem and leaf fibers, and synthetic fibers by needle punching process; the second bio-fiber geotextile 3 is made of animal fur fibers, plant stem and leaf fibers, and synthetic fibers, which are connected to the fibers of the first bio-fiber geotextile 1 by needle punching through the center hole of the well-shaped structure of the composite geotextile substrate 2. In some embodiments, the content of synthetic fibers in the first bio-fiber geotextile 1 and the second bio-fiber geotextile 3 is about 40%, and the rest is any mixture of animal fur fibers and plant stem and leaf fibers, with a content of about 60%; which can ensure the mechanical strength of the first bio-fiber geotextile 1 and the second bio-fiber geotextile 3. Specifically, the synthetic fibers in the first bio-fiber geotextile 1 and the second bio-fiber geotextile 3 are all polyester fibers, the animal fur fibers are mainly made of poultry feathers and livestock (pigs, cows, sheep, etc.) fur, and the plant stem and leaf fibers are mainly made of stem fiber of gramineous crops; all the fibers of the above bio-fiber geotextile are mixed and processed by needle punching process, and the thickness of each layer of bio-fiber geotextile is about 3-4mm, so that it has the water permeability and reverse filtration function of general needle-punched geotextile, and the gradual decomposition of bio-fiber can provide nitrogen fertilizer and carbon source for long-term microbial solidification. By using the above scheme, in the self-repairing high-strength composite geotextile 2, the composite geotextile substrate 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 filling, masonry and other earthwork structures on both sides of the geotextile.

[0065] In some embodiments, the outer surface of the self-repairing high-strength composite geotextile 2 is covered with a layer of PVA water-soluble slow-release film 4. In some embodiments, the PVA water-soluble slow-release film 4 is made of polyvinyl alcohol (PVA) coating solution, which is coated on the surface of the self-repairing high-strength composite geotextile 2 using a coating machine, and the thickness of the formed PVA water-soluble slow-release film 4 is about 1mm. By using the above scheme, the self-repairing high-strength composite geotextile 2 is applied to the slope engineering in water environment such as seawall, river embankment, lake embankment, etc., which requires avoiding water erosion to cause the loss of biological solidification substances on the geotextile during the construction period; therefore, the setting of the PVA water-soluble slow-release film 4 can prevent the loss of microbial solidification substances caused by water erosion during construction.

[0066] In some embodiments, the composite geotextile substrate 2 is fixed by limiting the fibers of the second bio-fiber geotextile 3 after being connected with the first bio-fiber geotextile 1 by needling; and the composite geotextile substrate 2 can be treated by a hot bonding process after weaving to bond the first warp 2-1, the second warp 2-2, the first weft 2-3 and the second weft 2-4 together at the intersection nodes. With the above scheme, the first warp 2-1, the second warp 2-2, the first weft 2-3 and the second weft 2-4 are bonded together at the intersection nodes by the hot bonding process, which can fix them together without slipping to maintain the stability of the central pore size.

[0067] In some embodiments, the fibers of the second bio-fiber geotextile 3 are needled to pass through the central pores of the lattice-shaped structure of the composite geotextile substrate 2, avoiding the fibers of the composite geotextile substrate 2, which can be achieved by a grid positioning method; the grid positioning method is to take the laying surface 5 of the needling machine as a two-dimensional coordinate system, and after the first bio-fiber geotextile 1 and the composite geotextile substrate 2 are sequentially laid on the needling machine by limiting, the parameters such as the side length of the central pores of the lattice-shaped structure of the composite geotextile substrate 2 and the fiber diameter are measured by a computer, and the centroid coordinates of the first pore located at the corner point of the close-limiting side 7 of the composite geotextile substrate 2 are measured as the starting reference coordinates, and then the above parameters are input into the computer program to output the relative coordinates of other pores, thereby achieving accurate positioning of the pores of the entire composite geotextile substrate 2; the limiting laying is to take the two orthogonal surrounding edges on the laying surface 5 of the needling machine as the close-limiting side 7, and the right-angle boundary of the first bio-fiber geotextile 1 and the composite geotextile substrate 2 is aligned with the close-limiting side 7 and laid on the laying surface 5 of the needling machine, and the first bio-fiber geotextile 1 and the composite geotextile substrate 2 are fixed by the edge press 6. With the above scheme, after the central pores of the composite geotextile substrate 2 are positioned by the grid positioning method, the fibers of the second bio-fiber geotextile 3 are needled to pass through the central pores of the lattice-shaped structure of the composite geotextile substrate 2, avoiding the fibers of the composite geotextile substrate 2, and connecting with the fibers of the first bio-fiber geotextile 1, which limits and fixes the composite geotextile substrate 2 while forming.

[0068] The preparation method of the self-repairing high-strength composite geotextile 2 of embodiment two includes the following steps:

[0069] (I) Preparation of the first bio-fiber geotextile 1; taking poultry feathers, livestock (pig, cow, sheep, etc.) fur, stem fiber of gramineous crops and polyester fiber as raw materials, the first bio-fiber geotextile 1 is formed by needling process, with a thickness of 4mm;

[0070] (II) Preparation of composite geotextile substrate 2; select ultra-high molecular weight polyethylene (UHMWPE) filament fibers as high-strength warp fibers and high-strength weft fibers, and select polypropylene filament fibers as polypropylene fibers; use a warp knitting machine to weave high-strength warp fibers, high-strength weft fibers and polypropylene fibers in a warp-weft crossing and upper-lower overlapping manner, and then perform hot bonding treatment at the cross nodes to prepare the composite geotextile substrate 2;

[0071] (III) Align the right-angle boundaries of the first bio-fiber geotextile 1 with the needle punching machine limiting edges 7, and lay them on the needle punching machine net laying surface 5, then align the right-angle boundaries of the composite geotextile substrate 2 with the needle punching machine limiting edges 7, and lay them on the first bio-fiber geotextile 1, and use the edge fixer 6 to fix the two layers of geotextiles; use the grid positioning method to obtain the coordinates of all the pore regions of the composite geotextile substrate 2 as the needle punching area;

[0072] (IV) After the raw materials of the second bio-fiber geotextile 3, i.e., poultry feathers, livestock (pig, cow, sheep, etc.) fur, and stem fiber of gramineous crops and polyester fiber are laid and netted, they are laid on the composite geotextile substrate 2, and the second bio-fiber geotextile 3 is formed by needle punching, with a thickness of 4 mm; the needle punching process also connects the fibers of the second bio-fiber geotextile 3 and the first bio-fiber geotextile 1 together, and limits and fixes the composite geotextile substrate 2;

[0073] (V) Prepare a mixed solution of Bacillus pasteurii, urea and calcium chloride, and uniformly spray it on the surface of the sewn self-repairing high-strength composite geotextile 2 and dry it;

[0074] (VI) Use a coating machine to coat polyvinyl alcohol (PVA) coating solution on the surface of the self-repairing high-strength composite geotextile 2 to form a PVA water-soluble slow-release film 4 with a thickness of 1 mm.

[0075] The mixed solution has the following ratio: the mixed solution contains cementing solution and bacterial solution, and the two are mixed at a volume ratio of 1:1; the cementing solution is prepared by mixing 1 mol / L urea solution and 1 mol / L calcium chloride solution at a ratio of 1:1; the bacterial solution is prepared by using Bacillus pasteurii bacterial solution with a concentration of OD600=1.0.

[0076] In step (IV), during needle punching, the needle penetrates the center pore of the composite geotextile substrate 2, and the fibers of the second bio-fiber geotextile 3 near the needle are entangled with the fibers of the first bio-fiber geotextile 1, thereby forming the second bio-fiber geotextile 3 while limiting the position of the composite geotextile substrate 2 and forming a whole structure of the three-layer geotextile structure.

[0077] The PVA water-soluble slow-release film 4 is made of polyvinyl alcohol (PVA) coating solution, and is plated on the surface of the self-repairing high-strength composite geotextile 2 using a coating machine, and the thickness of the PVA water-soluble slow-release film 4 is about 1 mm.

[0078] The following gives a specific application scenario of the self-repairing high-strength composite geotextile 2 of the above-mentioned embodiment two, but is not limited thereto: the self-repairing high-strength composite geotextile is transported from the factory to the revetment construction site, the area of the slope to be paved is leveled, and the self-repairing high-strength composite geotextile is paved in the area; during the construction process, a lap of more than 10 cm is required between every two pieces of geotextile; during the construction process, the paved self-repairing high-strength composite geotextile self-adapts to the slight deformation in the project, ensuring that the geotextile is closely attached to the slope filling, so that the protection, anti-filtration and biological self-repairing functions of the geotextile can normally play a role; after paving, a gravel cushion layer and a built-in block stone are paved on the geotextile; during the construction process, the PVA water-soluble slow-release film slowly dissolves, temporarily resisting water flow erosion of the geotextile, and after completion, the film is basically dissolved, water penetrates into the geotextile, and a biological solidification (MICP) reaction is induced, reinforcing the structures on both sides of the geotextile.

[0079] In the present specification, the same or similar parts between various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.

[0080] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A geotextile composite material, characterized by: The composite geotextile base material (2) comprises a plurality of warp threads and a plurality of weft threads arranged at the same distance to form a plurality of cross-shaped structures by interweaving each other in a crosswise and superimposed manner; the warp threads comprise first warp threads (2-1) and second warp threads (2-2); the weft threads comprise first weft threads (2-3) and second weft threads (2-4); N second warp threads (2-2) are arranged between the first warp threads (2-1); N second weft threads (2-4) are arranged between the first weft threads (2-3); the first warp threads (2-1) are made of high-strength warp yarn fibers; the first weft threads (2-3) are made of high-strength weft yarn fibers; the second warp threads (2-2) and the second weft threads (2-4) are made of polypropylene fibers; the high-strength warp yarn fibers and the high-strength weft yarn fibers are made of ultra-high molecular weight polyethylene filament fibers, and the polypropylene fibers are made of polypropylene filament fibers.

2. The geotextile composite of claim 1, wherein: The distance between adjacent first warp threads (2-1) and second warp threads (2-2), the distance between adjacent second warp threads (2-2) and second warp threads (2-2), the distance between adjacent first weft threads (2-3) and second weft threads (2-4), and the distance between adjacent second weft threads (2-4) and second weft threads (2-4) are the same; so that the center holes of each cross-shaped structure formed by the first warp threads (2-1), the second warp threads (2-2), the first weft threads (2-3) and the second weft threads (2-4) are uniform and have the same size.

3. The geotextile composite of claim 2, wherein: The side length of the center hole of all cross-shaped structures is 4mm.

4. The geotextile composite of claim 1, wherein: N=3。 5. The geotextile composite of claim 1, wherein: The first warp threads (2-1), the second warp threads (2-2), the first weft threads (2-3) and the second weft threads (2-4) are knitted together by a warp knitting machine to form an overall structure.

6. A self-repairing high-strength geotextile, characterized by: The self-repairing high-strength composite geotextile comprises a first biological fiber geotextile (1), a composite geotextile base material (2) according to any one of claims 1-5, and a second biological fiber geotextile (3) arranged from bottom to top.

7. The self-repairing high strength geotextile mat of claim 6, wherein: The outer surface of the self-repairing high-strength composite geotextile is covered with a layer of PVA water-soluble slow-release film (4).

8. The self-repairing high strength geotextile mat of claim 6, wherein: The composite geotextile base material (2) is connected and fixed by limiting the fibers of the second biological fiber geotextile (3) to the first biological fiber geotextile (1) through needling; and the first warp threads (2-1), the second warp threads (2-2), the first weft threads (2-3) and the second weft threads (2-4) can be bonded together at the cross nodes by using a hot bonding process after the knitting is completed.

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