Biological self-repairing reinforced composite geotextile and preparation method thereof

Abstract

The invention discloses biological self-repairing reinforced composite geotechnical cloth and a preparation method. The biological self-repairing reinforced composite geotechnical cloth is composed of glass fiber reinforced geotechnical cloth and biological composite fiber self-repairing geotechnical cloth which are sequentially arranged from top to bottom. The glass fiber reinforced geotextile comprises a geotextile base material and glass fibers, the glass fibers are fixed on the geotechnical cloth base material through a needling process. A scientific structure formed by overlapping the glass fiber reinforced geotextile and the biological composite fiber self-repairing geotextile is adopted, so that the bearing capacity and the tensile property of the geotextile of the composite structure are enhanced, the geotextile is prevented from being damaged due to elastic deformation, and the mechanical property of the geotextile of the composite structure is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of geotextiles, and in particular to a bio-self-repairing reinforced composite geotextile and a preparation method thereof. Background Art

[0002] With the continuous construction of my country's national infrastructure, various protective measures have been taken to prevent seawater erosion of the shoreline and protect the safety of shoreline buildings. Among them, geotextiles are widely used. Glass fiber composite geotextiles are suitable for the construction of highways, railways, water conservancy projects, airports, ports, land reclamation, landfills, municipal engineering projects, etc. They can meet the needs of high-strength reinforcement layers, solve the problem of excessive settlement and deformation of embankments, and improve their stability. The engineering function of glass fiber composite geotextiles is to allow liquids (such as groundwater) to pass through while meeting the needs of high reinforcement strength and low elongation, and can improve the bearing capacity of the foundation and reduce uneven subsidence.

[0003] In fact, with the continuous development of construction projects, bioreinforced composite geotextiles with longer lifespans and self-repairing capabilities are needed in slope protection projects in seawater environments to adapt to seawater erosion. However, existing glass fiber composite geotextiles cannot meet these requirements and have the following shortcomings: 1. Short service life, especially in seawater environments, prone to aging, cracking, and damage; 2. Weak functionality, simple structure, and no self-repair ability.

[0004] Therefore, in order to meet the existing construction requirements and lower the subsequent maintenance costs, in order to address the problems of glass fiber composite geotextiles having no self-repairing ability and being prone to aging and cracking, there is an urgent need for a biological self-repairing reinforced composite geotextile with a scientific structural composition and certain self-repairing ability. Summary of the Invention

[0005] (1) Technical issues to be solved

[0006] The technical problem to be solved by the present invention is to provide a bio-self-repairing reinforced composite geotextile and a preparation method, which adopts a scientific structure of overlapping a glass fiber reinforced geotextile with a layer of bio-composite fiber self-repairing geotextile to enhance the bearing capacity and tensile properties of the geotextile of the composite structure, to prevent the geotextile from being damaged due to elastic deformation, and thus enhance the mechanical properties of the geotextile of the composite structure.

[0007] (2) Technical solution

[0008] The solution adopted by the present invention to solve the above technical problems is a biological self-repairing reinforced composite geotextile, which is composed of a glass fiber reinforced geotextile and a biological composite fiber self-repairing geotextile arranged in sequence from top to bottom; the glass fiber reinforced geotextile includes a geotextile substrate and glass fibers; the glass fibers are fixed on the geotextile substrate by a needle punching process.

[0009] The above scheme adopts a scientific structure of overlapping glass fiber reinforced geotextile and a layer of bio-composite fiber self-repairing geotextile to enhance the bearing capacity and tensile properties of the geotextile of the composite structure, so as to prevent the damage of the geotextile due to elastic deformation, thereby enhancing the mechanical properties of the geotextile of the composite structure.

[0010] In some embodiments, the glass fiber includes a plurality of warp threads and a plurality of weft threads arranged at the same distance and interwoven with each other to form a plurality of tic-tac-toe structures.

[0011] In some embodiments, the spacing between two adjacent warps is the same as the spacing between two adjacent wefts, so that the central pores of each tic-tac-toe structure formed by two adjacent warps and two adjacent wefts are uniform and of the same size.

[0012] In some embodiments, the warp and weft of the glass fiber are uniformly cross-woven on the geotextile substrate using a warp knitting method.

[0013] In some embodiments, the warp and weft of the glass fiber are woven on the geotextile substrate using a biaxial warp knitting machine; the three-layer structure can be biaxially warp knitted to ensure that the bio-self-repairing reinforced composite geotextile is uniformly stressed in embankment reinforcement.

[0014] In some embodiments, the glass fibers include E-glass fibers.

[0015] Specifically, the glass fiber used is E-glass fiber with a tensile strength of 400-3000 MPa, an elastic modulus of 60-80 GPa, an elongation at break of 2-7%, and a melting point of approximately 850°C. The biorepairing reinforced composite geotextile's composition and weaving process are scientifically designed to enhance its mechanical strength, specifically its tensile strength, extending its service life and adapting it to various environments. Typical geotextiles have a maximum tensile strength of approximately 1000 MPa and an elastic modulus of less than 20 GPa.

[0016] By adopting the above scheme, it can be ensured that the bio-self-repairing reinforced composite geotextile is subjected to uniform force on the embankment reinforcement.

[0017] In some embodiments, the biocomposite fiber self-repairing geotextile includes synthetic fibers and animal and plant fibers; the synthetic fibers and animal and plant fibers are fixed to the glass fiber reinforced geotextile using a needle punching process.

[0018] In some embodiments, the synthetic fibers include polyester fibers and cotton fibers, and the plant and animal fibers include wool fibers; and the bio-composite fiber self-repairing geotextile comprises 40% polyester fibers, 40% cotton fibers, and 20% wool fibers.

[0019] In some embodiments, the synthetic fibers and plant and animal fibers are soaked in a saturated calcium chloride solution before the needling process; and a Bacillus pasteurianus solution is evenly sprayed on the outer surface of the prepared bio-composite fiber self-repairing geotextile.

[0020] Specifically, MICP technology, or microbial induced calcium carbonate precipitation, is a process that uses microbial activity to promote the precipitation of calcium carbonate, thereby improving the physical and chemical properties of soil or materials. This technology primarily uses bacteria to induce the precipitation of calcium carbonate in the environment, thereby strengthening the soil or repairing the material.

[0021] By adopting the above scheme, the infiltration of saturated calcium chloride solution can promote the precipitation of calcium carbonate and enhance its durability, which can prevent the sliding and erosion of most slopes in its application environment; the polyester fiber, cotton fiber and wool fiber are infiltrated with a saturated calcium chloride solution and evenly arranged on the upper layer of the glass fiber reinforced geotextile using a needle punching process; so that the bio-self-repairing reinforced composite geotextile not only has the performance of geotechnical reinforcement, but also enhances the durability of the geotextile due to the self-repairing ability of microorganisms, thereby improving the stability and bearing capacity of the soil; spraying Bacillus pasteurianus solution can promote the formation of calcium carbonate and enhance its durability, and achieve the purpose of self-repair based on MICP technology.

[0022] The solution adopted by the present invention to solve the above technical problems is a method for preparing a bio-self-repairing reinforced composite geotextile, comprising the following steps:

[0023] (1) Preparation of glass fiber reinforced geotextile: warp and weft threads made of glass fiber are evenly arranged on a flat geotextile substrate by warp knitting to ensure that the bio-self-repairing reinforced composite geotextile is evenly stressed in embankment reinforcement; warp and weft threads are evenly and cross-placed on a flat geotextile substrate, and biaxial warp knitting is performed on the three-layer structure by warp knitting;

[0024] (2) Preparation of biocomposite fiber self-repairing geotextile: polyester fiber and plant and animal fiber are soaked in saturated calcium chloride solution and evenly arranged on the upper layer of glass fiber reinforced geotextile by needle punching process;

[0025] (3) The surface of the biocomposite fiber self-repairing geotextile is evenly sprayed with a Bacillus pasteurianus microbial solution, and calcium carbonate precipitation is generated based on the MICP technology to achieve the purpose of self-repair.

[0026] (3) Beneficial effects

[0027] Compared with the prior art, the present invention designs a bio-self-repairing reinforced composite geotextile and its preparation method.

[0028] (1) The structural composition and weaving process of the present invention are scientific, which can improve the mechanical strength of the bio-self-repairing reinforced composite geotextile, that is, enhance the tensile strength, extend the service life and adapt to different environments, and have a wide range of engineering application scenarios;

[0029] (2) During the manufacturing process of the present invention, plant and animal fibers soaked in a saturated calcium chloride solution are added to the biocomposite fiber self-repairing geotextile, and microorganisms that can promote soil solidification are sprayed on its surface to make it have self-repairing ability; however, due to the constraints of the environmental humidity state, the biocomposite fiber self-repairing geotextile has certain limitations; therefore, a scientific structure of glass fiber reinforced geotextile and a layer of biocomposite fiber self-repairing geotextile is adopted to enhance the load-bearing capacity and tensile properties of the geotextile of the composite structure, to prevent the geotextile from being damaged due to elastic deformation, thereby enhancing the mechanical properties of the geotextile of the composite structure;

[0030] (3) The present invention uses microbial induced carbonate precipitation technology to achieve self-repair. In the event of damage or erosion during construction, the bio-self-repairing reinforced composite geotextile can adapt to scouring in various engineering constructions to prevent the composite geotextile from breaking or not fitting the rock and soil layer after damage occurs during use.

[0031] (4) The present invention adopts acupuncture technology, which makes it easy to realize the mass production of bio-self-repairing reinforced composite geotextiles, reduce production costs and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0033] Figure 1 This is a schematic diagram of the cross-sectional structure of a bio-self-repairing reinforced composite geotextile of the present invention;

[0034] Figure 2 This is a schematic diagram of the planar structure of the glass fiber reinforced geotextile of the present invention.

[0035] The names of the components corresponding to the various reference numerals in the figure are: 1. Glass fiber reinforced geotextile; 1-1. Warp; 1-2. Weft; 1-3. Geotextile substrate; 2. Biocomposite fiber self-repairing geotextile. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention are described in further detail with reference to 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.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] The following describes the embodiments 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 embodiments, 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 features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0039] 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 this 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.

[0040] 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 illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0041] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0042] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0043] like Figure 1-Figure 2 As shown, the present invention provides a biorepairing reinforced composite geotextile, comprising a glass fiber reinforced geotextile 1 and a biorepairing composite fiber self-repairing geotextile 2, arranged sequentially from top to bottom. The glass fiber reinforced geotextile 1 includes geotextile substrates 1-3 and glass fibers, which are affixed to the geotextile substrates 1-3 via a needle punching process. This scheme employs a scientific structure in which the glass fiber reinforced geotextile 1 is superimposed on a layer of biorepairing composite fiber self-repairing geotextile 2 to enhance the load-bearing capacity and tensile strength of the composite geotextile, preventing damage to the geotextile due to elastic deformation, thereby enhancing the mechanical properties of the composite geotextile.

[0044] In some embodiments, the glass fiber includes a plurality of warps 1-1 and a plurality of wefts 1-2 arranged at the same distance, which are interwoven to form a plurality of tic-tac-toe structures. In some embodiments, the spacing between two adjacent warps 1-1 and the spacing between two adjacent wefts 1-2 are the same, so that the central pores of each tic-tac-toe structure formed by two adjacent warps 1-1 and two adjacent wefts 1-2 are uniform and of the same size. In some embodiments, the warps 1-1 and wefts 1-2 of the glass fiber are uniformly cross-woven on the geotextile substrate 1-3 using a warp knitting method. In some embodiments, the warps 1-1 and wefts 1-2 of the glass fiber are woven on the geotextile substrate 1-3 using a biaxial warp knitting machine; the three-layer structure can be biaxially warp knitted to ensure that the bio-self-repairing reinforced composite geotextile is uniformly stressed for embankment reinforcement. In some embodiments, the glass fiber includes E-glass fiber. Specifically, the glass fiber used is E-glass fiber with a tensile strength of 400-3000 MPa, an elastic modulus of 60-80 GPa, an elongation at break of 2-7%, and a melting point of approximately 850°C. The biorepairing reinforced composite geotextile has a scientific composition and weaving process, which can improve the mechanical strength of the biorepairing reinforced composite geotextile, namely, enhance its tensile strength, extend its service life, and adapt to different environments. Generally, the maximum tensile strength of geotextiles is approximately 1000 MPa, and the elastic modulus is less than 20 GPa. This solution ensures that the biorepairing reinforced composite geotextile is evenly stressed during embankment reinforcement.

[0045] In some embodiments, the biocomposite fiber self-healing geotextile 2 comprises synthetic fibers and plant and animal fibers; the synthetic fibers and plant and animal fibers are affixed to the glass fiber reinforced geotextile 1 using a needle-punching process. In some embodiments, the synthetic fibers comprise polyester fibers and cotton fibers, and the plant and animal fibers comprise wool fibers. Furthermore, the biocomposite fiber self-healing geotextile 2 comprises 40% polyester fibers, 40% cotton fibers, and 20% wool fibers. In some embodiments, the synthetic fibers and plant and animal fibers are impregnated with a saturated calcium chloride solution before the needle-punching process. A Bacillus pasteurianus solution is evenly sprayed on the outer surface of the biocomposite fiber self-healing geotextile 2. The concentration of the saturated calcium chloride solution is 1 mol / L, and the OD600 concentration of the Bacillus pasteurianus solution is 1.0. Specifically, MICP technology, or microbial induced calcium carbonate precipitation technology, utilizes microbial activity to promote calcium carbonate precipitation, thereby improving the physical and chemical properties of soil or materials. This technology primarily uses bacteria to induce calcium carbonate precipitation in the environment, thereby strengthening soil or repairing materials. By adopting the above scheme, the infiltration of saturated calcium chloride solution can promote the precipitation of calcium carbonate and enhance its durability, which can prevent the sliding and erosion of most slopes in its application environment; the polyester fiber, cotton fiber and wool fiber are infiltrated with a saturated calcium chloride solution and evenly arranged on the upper layer of the glass fiber reinforced geotextile 1 by a needle punching process; so that the bio-self-repairing reinforced composite geotextile has both geotechnical reinforcement properties and the durability of the geotextile is enhanced due to the self-repairing ability of microorganisms, thereby improving the stability and bearing capacity of the soil; spraying Bacillus pasteurianus solution can promote the formation of calcium carbonate and enhance its durability, and achieve the purpose of self-repair based on MICP technology.

[0046] The present invention provides a method for preparing a biorepairing reinforced composite geotextile, comprising the following steps:

[0047] (1) Preparing a glass fiber reinforced geotextile 1: using a warp knitting method to evenly arrange the warp threads 1-1 and weft threads 1-2 made of glass fibers on a flat geotextile substrate 1-3 to ensure that the bio-self-repairing reinforced composite geotextile is evenly stressed in the embankment reinforcement; placing the warp threads 1-1 and weft threads 1-2 evenly and crosswise on the flat geotextile substrate 1-3, and performing biaxial warp knitting on the three-layer structure using a warp knitting method;

[0048] (2) Preparation of biocomposite fiber self-repairing geotextile 2: impregnating polyester fiber and plant and animal fiber with saturated calcium chloride solution and evenly arranging them on the upper layer of glass fiber reinforced geotextile 1 by needle punching;

[0049] (3) The surface of the biocomposite fiber self-repairing geotextile 2 is evenly sprayed with a Bacillus pasteurianus microbial solution, and calcium carbonate precipitation is generated based on the MICP technology to achieve the purpose of self-repair.

[0050] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0051] The following is a specific application scenario of the bio-self-repairing reinforced composite geotextile of the present invention, but it is not limited to this: the bio-self-repairing reinforced composite geotextile is transported from the factory to the seawall. After the area to be laid is leveled, debris on the embankment surface should be cleaned up. When laying begins, the operating vessel enters the laying position according to the positioning method, and then drops anchor to position. The four anchors at the four corners of the vessel are fixed in an eight-shaped pattern. After that, the rolled bio-self-repairing reinforced composite geotextile drum is slowly placed into the water, and the starting end of the geotextile is fixed with a small anchor. The vessel is slowly moved by the four anchor machines on the operating vessel, and the drum is dragged to lay it in the area, and gravel is dropped on board as it is laid. During the construction process, there needs to be an overlap of more than 10 cm between each two pieces of bio-self-repairing reinforced composite geotextile.

[0052] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A biorepairing reinforced composite geotextile, characterized by: The invention comprises a glass fiber reinforced geotextile (1) and a biocomposite fiber self-repairing geotextile (2) arranged in sequence from top to bottom; the glass fiber reinforced geotextile (1) comprises a geotextile base material (1-3) and glass fibers; the glass fibers are fixed on the geotextile base material (1-3) by a needle punching process.

2. The biorepairing reinforced composite geotextile according to claim 1, characterized in that: The glass fiber comprises a plurality of warps (1-1) and a plurality of wefts (1-2) arranged at the same distance and interwoven with each other to form a plurality of tic-tac-toe structures.

3. The biorepairing reinforced composite geotextile according to claim 2, characterized in that: The spacing between two adjacent warps (1-1) and the spacing between two adjacent wefts (1-2) are the same, so that the central pores of each well-shaped structure formed by the two adjacent warps (1-1) and the two adjacent wefts (1-2) are uniform and of the same size.

4. The biorepairing reinforced composite geotextile according to claim 1, characterized in that: The warp threads (1-1) and weft threads (1-2) of the glass fibers are uniformly cross-woven on the geotextile substrate (1-3) by using a warp knitting method.

5. The biorepairing reinforced composite geotextile according to claim 4, characterized in that: The warp threads (1-1) and weft threads (1-2) of the glass fibers are woven onto the geotextile substrate (1-3) using a biaxial warp knitting machine.

6. The biorepairing reinforced composite geotextile according to claim 1, characterized in that: The glass fibers include E-glass fibers.

7. The biorepairing reinforced composite geotextile according to claim 1, characterized in that: The biocomposite fiber self-repairing geotextile (2) comprises synthetic fibers and animal and plant fibers; the synthetic fibers and animal and plant fibers are fixed on the glass fiber reinforced geotextile (1) by using a needle punching process.

8. The biorepairing reinforced composite geotextile according to claim 7, characterized in that: The synthetic fibers include polyester fibers and cotton fibers, and the plant and animal fibers include wool fibers; and the biocomposite fiber self-repairing geotextile (2) comprises 40% polyester fibers, 40% cotton fibers, and 20% wool fibers.

9. The biorepairing reinforced composite geotextile according to claim 7, characterized in that: The synthetic fibers and animal and plant fibers are soaked in a saturated calcium chloride solution before the needling process; and a Bacillus pasteurianus solution is evenly sprayed on the outer surface of the prepared bio-composite fiber self-repairing geotextile (2).

10. A method for preparing a biorepairing reinforced composite geotextile, characterized by: The following steps are involved: (1) Preparing a glass fiber reinforced geotextile (1): uniformly arranging warp threads (1-1) and weft threads (1-2) made of glass fibers on a flat geotextile substrate (1-3) by using a warp knitting method to ensure that the bio-self-repairing reinforced composite geotextile is uniformly stressed for embankment reinforcement; uniformly cross-plying the warp threads (1-1) and weft threads (1-2) on the flat geotextile substrate (1-3), and biaxially warp knitting the three-layer structure by using a warp knitting method; (2) Preparation of biocomposite fiber self-repairing geotextile (2): impregnating polyester fiber and plant and animal fiber with a saturated calcium chloride solution and evenly arranging them on the upper layer of the glass fiber reinforced geotextile (1) by needle punching; (3) The surface of the biocomposite fiber self-repairing geotextile (2) is evenly sprayed with a Bacillus pasteurianus microbial solution, and calcium carbonate precipitation is generated based on the MICP technology to achieve the purpose of self-repair.

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