Self-repairing warp-knitted interval high-strength geotextile and preparation method thereof

Abstract

The invention discloses a self-repairing warp-knitted interval high-strength geotextile and a preparation method. The self-repairing warp-knitted interval high-strength geotextile is composed of a surface layer warp-knitted high-strength geotextile body, an interval yarn layer and a surface layer warp-knitted high-strength geotextile body which are sequentially arranged from bottom to top. The surface layer warp-knitted high-strength geotextile takes high-strength synthetic fibers as raw materials; the interval yarn layer takes covering yarns as interval yarn fibers and is connected with the warp-knitted high-strength geotextile of the upper surface layer and the warp-knitted high-strength geotextile of the lower surface layer; the covering yarn is composed of an inner high-strength core yarn fiber and an outer bio-fiber wrapping layer. The high-strength geotextile has a simple and efficient composition structure, and the surface layer high-strength geotextile provides higher mechanical strength and can effectively resist the damage of various dynamic and static loads in a use environment; the special structure of the spacer fabric enables the self-repairing high-strength composite geotextile to have excellent water permeability and reverse filtration functions, permeation erosion can be effectively resisted, and the biological curing effect can deeply play a role in filling soil.

Description

Technical Field

[0001] The present invention relates to the technical field of geotextiles, and in particular to a self-repairing warp-knitted spaced high-strength geotextile and a preparation method thereof, which can be used to quickly produce a multi-layer reinforced geotextile, and can be used to protect and filter slope projects such as seawalls and riverbanks in water environments, and at the same time use bio-solidification technology to perform biological reinforcement on engineering structures. Background Art

[0002] Geotextiles are widely used in a variety of projects such as embankments, foundation pits, roads, etc., playing an important role in protection, reinforcement, isolation, etc. In embankment projects such as seawalls and river embankments in water environments, the engineering role of geotextiles is not only general reinforcement and protection, but also filtering (anti-filtration) to allow liquids (such as seawater, groundwater, etc.) to pass through the pores of the geotextile, but keep the soil particles from being lost.

[0003] With the continuous development of construction projects, slope projects in water environments often require geotextiles with higher mechanical strength, longer service life and self-repairing ability due to the complex chemical and biological environment, so as to better reinforce and protect the projects, and can use the biological solidification process to complete the self-reinforcement of the structure to achieve longer-term use. However, the existing general geotextiles cannot meet the above requirements and have the following shortcomings: 1. Poor mechanical strength, especially poor compressive strength, prone to holes, tears and other hazards when local forces are concentrated or large; 2. Insufficient service life, and less use of components with high life and good environmental tolerance; 3. Lack of self-repairing ability, unable to further reinforce the engineering structure during use, resulting in difficulties in later maintenance; 4. Limited anti-filtration function, limited protection of soil particles, etc.

[0004] Therefore, in order to meet the growing construction requirements, a new type of geotextile with high strength, long life and self-repairing ability is urgently needed to address the problems of insufficient mechanical strength, low 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 warp-knitted spacer high-strength geotextile and a preparation method thereof, which has a simple and efficient composition structure. The surface high-strength geotextile provides higher mechanical strength and can effectively resist damage from various dynamic and static loads in the use environment; and the special structure of the spacer fabric enables the self-repairing high-strength composite geotextile to have excellent water permeability and anti-filtration functions, which can effectively resist infiltration erosion and is conducive to the biological solidification effect to penetrate into the fill.

[0007] (II) Technical solution

[0008] The solution adopted by the present invention to solve the above technical problems is a self-repairing warp knitted spacer high-strength geotextile, including a self-repairing warp knitted spacer high-strength geotextile, wherein the self-repairing warp knitted spacer high-strength geotextile is composed of a surface layer of warp knitted high-strength geotextile, a spacer yarn layer and a surface layer of warp knitted high-strength geotextile arranged in sequence from bottom to top;

[0009] The surface layer warp-knitted high-strength geotextile is made of high-strength synthetic fiber as raw material;

[0010] The spacer yarn layer uses core-spun yarn as the spacer yarn fiber to connect the upper and lower surface layers of warp-knitted high-strength geotextiles; the core-spun yarn is composed of internal high-strength core yarn fibers and an external biological fiber outer sheath.

[0011] In some embodiments, the high-strength synthetic fiber of the surface warp-knitted high-strength geotextile and the high-strength core yarn fiber of the spacer yarn layer are polypropylene filament fibers, whose tensile strength is about 1000-1500MPa, and the service life buried in the application environment such as the bank slope is at least 50 years, while the tensile strength of polyester fiber, polyamide fiber and polypropylene staple 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 warp-knitted spacer high-strength geotextile are greatly improved compared with general geotextiles;

[0012] The raw materials used for the biological fiber outer covering layer of the core-spun yarn of the spacer yarn layer are animal fur fibers and plant stem and leaf fibers, and the two are mixed in a ratio of 1:1; the animal fur fibers are mainly processed from poultry feathers and livestock fur, and the plant stem and leaf fibers are mainly processed from straw fibers of crops such as corn and wheat; the gradual decomposition of the biological fiber can provide nitrogen fertilizer and carbon source for the solidification effect of microorganisms for a long time.

[0013] By adopting the above scheme, the surface warp knitted high-strength geotextile and the high-strength core yarn fiber of the spacer yarn layer provide mechanical strength and service life for the self-repairing warp knitted spacer high-strength geotextile; the biological fiber outer layer of the spacer yarn layer carries the substances required for biological solidification, which plays a role in reinforcing geotechnical structures such as backfill and masonry stones on both sides of the self-repairing warp knitted spacer high-strength geotextile; the three-dimensional interwoven structure of the spacer yarn layer makes the self-repairing warp knitted spacer high-strength geotextile have good filtering and anti-filtration functions.

[0014] In some embodiments, the outer surface of the self-repairing warp-knitted spaced high-strength geotextile is covered with a layer of polyvinyl alcohol water-soluble slow-release film with a thickness of about 1 mm.

[0015] By adopting the above scheme, the provision of the polyvinyl alcohol water-soluble slow-release film can prevent the loss of biosolidified substances on the geotextile due to water erosion during the construction period of the self-repairing warp-knitted spacer high-strength geotextile applied to seawalls, riverbanks and other slope projects in water environments.

[0016] In some embodiments, the fibers of the surface layer warp-knitted high-strength geotextile and the fibers of the spacer yarn layer are woven together by a Raschel double-needle bed warp knitting machine to form an integral whole.

[0017] In some embodiments, the fibers of the surface layer warp-knitted high-strength geotextile are woven in the warp and weft directions during warp knitting, interwoven with each other to form a square grid structure, and the central pores of the grid structure are uniform and the size is consistent; the spacer yarn fibers of the spacer yarn layer are woven into a spacer structure in an "X"-shaped crossing manner, and the thickness of the final spacer yarn layer is 10 mm; this can ensure that the spacer yarn layer has good anti-lateral displacement capability within the plane.

[0018] In some embodiments, the core-spun yarn in the spacer yarn layer is composited by wrapping a biological fiber outer sheath around the outside of the high-strength core yarn fiber through a twisting process.

[0019] In some embodiments, the diameter of the high-strength core yarn fiber in the core-spun yarn of the spacer yarn layer is not less than 80% of the fiber diameter of the surface layer warp-knitted high-strength geotextile, which can ensure that when the biological fiber outer sheath is continuously worn out in the later period of use of the geotextile, the spacer yarn layer still maintains sufficient mechanical strength; and the material consumption of the biological fiber outer sheath is calculated based on the cross-sectional area, accounting for 30%-40% of the cross-sectional area of ​​the entire core-spun yarn.

[0020] The solution adopted by the present invention to solve the above technical problems is a method for preparing a self-repairing warp-knitted spacer high-strength geotextile, comprising the following steps:

[0021] (I) preparing a core-spun yarn for a spacer yarn layer; using high-strength synthetic fiber filaments as core yarns and laying them on the upper row of a roving frame of a spinning frame; making animal fur fibers, plant stem and leaf fibers, etc. into short biological fiber yarns and laying them on the lower row of the roving frame; wrapping the short biological fiber yarns on the outside of the core yarn and spinning them into core-spun yarns through a twisting process;

[0022] (II) High-strength synthetic fibers and core-spun yarns are introduced into a Raschel double needle bed warp knitting machine. While warp knitting to form two surface layers of warp knitted high-strength geotextiles, the core-spun yarns also bind the fibers of the surface layer of warp knitted high-strength geotextiles, connecting the two surface layers and forming a spacer yarn layer; the spacing between the two needle beds can be flexibly adjusted to control the knitting thickness of the geotextile;

[0023] (III) A mixed solution of Bacillus pasteurianus, urea and calcium chloride is prepared, and the sewn self-repairing warp-knitted high-strength geotextile is immersed in the mixed solution for a period of time, and then taken out and dried.

[0024] In some embodiments, after the step (III) is completed, the polyvinyl alcohol coating liquid is sprayed on the surface of the self-repairing high-strength composite geotextile using a coating machine to form a layer of polyvinyl alcohol water-soluble slow-release film.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention designs a self-repairing warp-knitted spacer high-strength geotextile and a preparation method thereof.

[0027] (1) The present invention has a simple and efficient composition structure. The surface high-strength geotextile provides high mechanical strength and can effectively resist the damage of various dynamic and static loads in the use environment; and the special structure of the spacer fabric makes the self-repairing high-strength composite geotextile have excellent water permeability and anti-filtration functions, which can effectively resist penetration erosion and is conducive to the biological solidification effect to penetrate into the fill soil;

[0028] (2) The invention uses high-life materials that can better adapt to the water environment of the embankment project, have good tolerance to weak alkalinity in the environment, have a longer service life than general geotextiles, and achieve long-term reliable protection;

[0029] (3) The present invention has a unique self-repairing ability. During use, the biological fibers on the outside of the core-spun yarn can gradually decompose, providing nitrogen fertilizer and carbon source for the long-term curing effect of microorganisms. The biological curing reaction can further reinforce the geotechnical structure protected by the geotextile, bond soil particles and repair cracks in the structure, further improving the life and reliability of the engineering structure, saving maintenance costs, and having high economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 It is a structural schematic diagram of a self-repairing warp-knitted spaced high-strength geotextile of the present invention;

[0032] Figure 2 It is a schematic cross-sectional view of the core-spun yarn structure of the spacer yarn layer of the present invention.

[0033] The names of the components corresponding to the various reference numerals in the figure are: 1. surface warp-knitted high-strength geotextile; 2. spacer yarn layer; 2-1. high-strength core yarn fiber; 2-2. biological fiber outer layer; 3. polyvinyl alcohol water-soluble sustained-release film. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0041] like Figure 1-Figure 2 As shown, the present invention provides a self-repairing warp knitted spacer high-strength geotextile, including a self-repairing warp knitted spacer high-strength geotextile, the self-repairing warp knitted spacer high-strength geotextile is composed of a surface warp knitted high-strength geotextile 1, a spacer yarn layer 2 and a surface warp knitted high-strength geotextile 1 arranged in sequence from bottom to top; the surface warp knitted high-strength geotextile 1 uses high-strength synthetic fiber as raw material; the spacer yarn layer 2 uses core-spun yarn as spacer yarn fiber, connecting the upper and lower surface warp knitted high-strength geotextiles 1; the core-spun yarn is composed of an internal high-strength core yarn fiber 2-1 and an external biological fiber outer sheath 2-2. In some embodiments, the high-strength synthetic fiber of the surface warp-knitted high-strength geotextile 1 and the high-strength core yarn fiber 2-1 of the spacing yarn layer 2 are made of polypropylene filament fiber, which has a tensile strength of 1000-1500MPa and a service life of at least 50 years when buried in application environments such as embankment slopes. The tensile strength of polyester fiber, polyamide fiber and polypropylene staple 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 warp-knitted spacing high-strength geotextile are greatly improved compared with general geotextiles; the raw materials used for the biological fiber outer layer 2-2 of the core yarn of the spacing yarn layer 2 are animal fur fibers and plant stem and leaf fibers, and the two are mixed in a 1:1 ratio; animal fur fibers are mainly processed from poultry feathers and livestock fur, and plant stem and leaf fibers are mainly processed from straw fibers of crops such as corn and wheat; the gradual decomposition of the biological fiber can provide nitrogen fertilizer and carbon source for the solidification of microorganisms for a long time. By adopting the above scheme, the surface warp knitted high-strength geotextile 1 and the high-strength core yarn fiber 2-1 of the spacer yarn layer 2 provide mechanical strength and service life for the self-repairing warp knitted spacer high-strength geotextile; the biological fiber outer layer 2-2 of the spacer yarn layer 2 carries the substances required for biological solidification, which plays a role in reinforcing geotechnical structures such as backfill and masonry stones on both sides of the self-repairing warp knitted spacer high-strength geotextile; the three-dimensional interwoven structure of the spacer yarn layer 2 makes the self-repairing warp knitted spacer high-strength geotextile have good filtering and anti-filtration functions.

[0042] In some embodiments, the outer surface of the self-repairing warp knitted high-strength geotextile is covered with a layer of polyvinyl alcohol water-soluble slow-release film 3, and the thickness is 1 mm. With the above solution, the setting of the polyvinyl alcohol water-soluble slow-release film 3 can prevent the loss of biosolidified substances on the geotextile due to water erosion during the construction period of the self-repairing warp knitted high-strength geotextile applied to seawalls, river embankments and other slope projects in water environments.

[0043] In some embodiments, the fibers of the surface warp-knitted high-strength geotextile 1 and the fibers of the spacer yarn layer 2 are woven together by a Raschel double-needle bed warp knitting machine to form an integral body. In some embodiments, the fibers of the surface warp-knitted high-strength geotextile 1 are woven in a warp and weft lining manner during warp knitting, interweaving to form a square grid structure, and the central pores of the grid structure are uniform and the size is consistent; the spacer yarn fibers of the spacer yarn layer 2 are woven into a spacer structure in an "X"-shaped crossing manner, and the thickness of the spacer yarn layer 2 finally formed is 10 mm; it can ensure that the spacer yarn layer 2 has good anti-lateral displacement ability in the plane. In some embodiments, the core-spun yarn in the spacer yarn layer 2 is composited with a biological fiber outer sheath 2-2 wrapped on the outside of the high-strength core yarn fiber 2-1 through a twisting process.

[0044] In some embodiments, in the core-spun yarn of the spacer yarn layer 2, the diameter of the high-strength core yarn fiber 2-1 is 80% of the fiber diameter of the surface warp-knitted high-strength geotextile 1, which can ensure that when the biological fiber outer sheath 2-2 is continuously worn out in the later period of use of the geotextile, the spacer yarn layer 2 still maintains sufficient mechanical strength; and the material consumption of the biological fiber outer sheath 2-2 is calculated based on the cross-sectional area, accounting for 40% of the cross-sectional area of ​​the entire core-spun yarn.

[0045] The present invention provides a method for preparing a self-repairing warp-knitted spacer high-strength geotextile, comprising the following steps:

[0046] (I) preparing a core-spun yarn for a spacer yarn layer 2; selecting polypropylene filament fiber as a high-strength core yarn fiber 2-1 as the material of the inner core yarn, and laying it on the upper row of the roving frame of the spinning frame; making bio-fiber short yarns from poultry feathers, livestock fur, crop straw fibers, etc., as the material of the bio-fiber outer layer 2-2, and laying it on the lower row of the roving frame; wrapping the bio-fiber short yarns on the outside of the core yarn, and spinning it into a core-spun yarn through a twisting process;

[0047] (II) Polypropylene filament fiber is selected as a high-strength synthetic fiber as the material of the surface warp-knitted high-strength geotextile 1, and the polypropylene filament fiber and the core-spun yarn are introduced into the Raschel double needle bed warp knitting machine. While the two surface warp-knitted high-strength geotextiles 1 are warp-knitted, the core-spun yarn also binds the fibers of the surface warp-knitted high-strength geotextile 1, connects the two surface layers and forms a spacer yarn layer 2; the spacing between the two needle beds is adjusted, and the weaving thickness of the obtained self-repairing warp-knitted spacer high-strength geotextile is 10 mm;

[0048] (III) preparing a mixed solution of Bacillus pasteurianus, urea and calcium chloride, immersing the sewn self-repairing warp-knitted high-strength geotextile in the mixed solution for a period of time, and then taking it out to dry;

[0049] (IV) A coating machine is used to spray the polyvinyl alcohol coating liquid onto the surface of the self-repairing warp-knitted high-strength geotextile to form a layer of polyvinyl alcohol water-soluble sustained-release film 3 with a film thickness of 1 mm.

[0050] 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.

[0051] A specific application scenario of the self-repairing warp knitted high-strength geotextile of the above embodiment is given below, but it is not limited to this: the self-repairing warp knitted high-strength geotextile is transported from the factory to the roadbed construction site, and the self-repairing warp knitted high-strength geotextile is laid in the area after the slope area to be laid is leveled; during the construction process, generally at least 10 cm overlap is required between each two pieces of MICP double-sided self-repairing geotextile; after laying, a gravel cushion layer is laid on the geotextile, and other geotechnical structures such as cast-in-place blocks are built; during construction, the polyvinyl alcohol water-soluble slow-release film slowly dissolves to temporarily prevent water from scouring the geotextile. After completion, the film is basically dissolved, and water penetrates into the geotextile, triggering a microbial curing (MICP) reaction, and reinforcing the geotechnical structures on both sides of the geotextile. 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.

[0052] 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 warp knitted spaced high-strength geotextile, comprising a self-repairing warp knitted spaced high-strength geotextile, characterized in that: The self-repairing warp knitted spacer high-strength geotextile is composed of a surface warp knitted high-strength geotextile (1), a spacer yarn layer (2) and a surface warp knitted high-strength geotextile (1) which are arranged in sequence from bottom to top; The surface layer warp-knitted high-strength geotextile (1) is made of high-strength synthetic fibers as raw materials; The spacer yarn layer (2) uses core-spun yarn as the spacer yarn fiber, connecting the upper and lower surface layers of warp-knitted high-strength geotextile (1); the core-spun yarn is composed of internal high-strength core yarn fibers (2-1) and an external biological fiber outer sheath (2-2).

2. The self-repairing warp-knitted high-strength geotextile according to claim 1, characterized in that: The outer surface of the self-repairing warp-knitted spaced high-strength geotextile is covered with a layer of polyvinyl alcohol water-soluble slow-release film (3).

3. The self-repairing warp-knitted high-strength geotextile according to claim 1, characterized in that: The fibers of the surface warp-knitted high-strength geotextile (1) and the fibers of the spacer yarn layer (2) are woven together by a Raschel double-needle bed warp knitting machine to form an integral whole.

4. The self-repairing warp-knitted high-strength geotextile according to claim 1, characterized in that: The fibers of the surface warp-knitted high-strength geotextile (1) are woven in a warp and weft interlaced manner during warp knitting to form a square grid structure, and the central pores of the grid structure are uniform and have a consistent size; the spacer yarn fibers of the spacer yarn layer (2) are woven into the spacer structure in an "X"-shaped crossing manner.

5. The self-repairing warp-knitted high-strength geotextile according to claim 1, characterized in that: The core-spun yarn in the spacer yarn layer (2) is composited by wrapping a biological fiber outer layer (2-2) around the outside of a high-strength core yarn fiber (2-1) through a twisting process.

6. The self-repairing warp-knitted high-strength geotextile according to claim 1, characterized in that: In the core-spun yarn of the spacer yarn layer (2), the diameter of the high-strength core yarn fiber (2-1) is not less than 80% of the fiber diameter of the surface warp-knitted high-strength geotextile (1); and the material usage of the biological fiber outer sheath (2-2) is calculated based on the cross-sectional area and accounts for 30%-40% of the cross-sectional area of ​​the entire core-spun yarn.

7. A method for preparing a self-repairing warp-knitted spaced high-strength geotextile, characterized in that: The following steps are involved: (I) preparing a core-spun yarn of the spacer yarn layer (2); using high-strength synthetic fiber filaments as core yarns and laying them on the upper row of the roving frame of a spinning machine; making animal fur fibers, plant stem and leaf fibers, etc. into biological fiber short yarns and laying them on the lower row of the roving frame; wrapping the biological fiber short yarns on the outside of the core yarn and spinning them into core-spun yarn through a twisting process; (II) High-strength synthetic fibers and core-spun yarns are introduced into a Raschel double needle bed warp knitting machine. While warp knitting to form two surface layers of warp knitted high-strength geotextiles (1), the core-spun yarns also bind the fibers of the surface layer of warp knitted high-strength geotextiles (1), connecting the two surface layers and forming a spacer yarn layer (2); the spacing between the two needle beds can be flexibly adjusted, thereby controlling the knitting thickness of the geotextile; (III) A mixed solution of Bacillus pasteurianus, urea and calcium chloride is prepared, and the sewn self-repairing warp-knitted high-strength geotextile is immersed in the mixed solution for a period of time, and then taken out and dried.

8. The method for preparing the self-repairing warp-knitted spaced high-strength geotextile according to claim 7, characterized in that: After the step (III) is completed, the polyvinyl alcohol coating liquid is sprayed on the surface of the self-repairing high-strength composite geotextile using a coating machine to form a layer of polyvinyl alcohol water-soluble slow-release film (3).

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