Biological self-repairing geotextile suitable for soil slope

Abstract

The utility model discloses a biological self-repairing geotextile suitable for a soil slope, which is fixed on the soil slope surface by adopting anchor rods and comprises two layers of biological composite fiber geotextile arranged up and down and a layer of polypropylene fiber geotextile arranged between the two layers of biological composite fiber geotextile, the biological self-repairing geotextile is formed by connecting biological composite fiber geotextile, polypropylene fiber geotextile and biological composite fiber geotextile from top to bottom in sequence through needling. According to the biological self-repairing geotextile, the biological composite fiber geotextile, the polypropylene fiber geotextile and the biological composite fiber geotextile are connected into the biological self-repairing geotextile by adopting a needling technology; batch production of the biological self-repairing composite geotextile can be realized, the production cost is reduced, and the production efficiency is improved; and the biological self-repairing geotechnical cloth is fixed on the soil slope surface in a step shape, so that the soil slope in the application environment can be prevented from sliding and eroding.

Description

Technical Field

[0001] The utility model relates to the technical field of geotextiles, in particular to a bio-self-repairing geotextile suitable for soil slopes. Background Technique

[0002] In fact, with the continuous progress of construction projects, a bio-self-repairing geotextile suitable for soil slopes with self-repairing ability is required in the protection of soil slopes to withstand the scouring and erosion of rainwater in soil slope projects. Existing measures such as setting retaining walls and rainwater soil slopes are used to prevent rainwater from scouring and corroding the ground of soil slopes and to prevent soil erosion of soil slopes. However, the required retaining walls and rainwater soil slopes for these measures have high requirements for the bearing capacity of the ground foundation of soil slopes and are not suitable for high soil slopes.

[0003] Therefore, to meet the requirements of existing engineering construction and the relatively low maintenance cost in the later stage, and to address the environmental problems brought by existing measures, there is an urgent need to form a bio-self-repairing geotextile suitable for soil slopes. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] The technical problem to be solved by the utility model is to provide a bio-self-repairing geotextile suitable for soil slopes. A bio-composite fiber geotextile is made of synthetic fibers and animal and plant fibers infiltrated with saturated calcium chloride solution, and the made bio-self-repairing geotextile is immersed in a Bacillus subtilis microbial suspension to endow it with self-repairing ability. Then, the MICP technology is used to extend the service life of the bio-self-repairing geotextile, enabling it to adapt to various different harsh environments and having a broad engineering application scenario.

[0006] (2) Technical Solutions

[0007] The solution adopted by the utility model to solve the above technical problem is a bio-self-repairing geotextile suitable for soil slopes, which is fixed on the soil slope by anchor bolts. The bio-self-repairing geotextile includes two layers of bio-composite fiber geotextiles arranged up and down, and a layer of polypropylene fiber geotextile arranged between the two layers of bio-composite fiber geotextiles. Moreover, the bio-self-repairing geotextile is formed by needle punching connection of the bio-composite fiber geotextile, polypropylene fiber geotextile, and bio-composite fiber geotextile arranged from top to bottom in sequence.

[0008] Adopting the above solution, the bio-composite fiber geotextile, polypropylene fiber geotextile, and bio-composite fiber geotextile are connected into a bio-self-repairing geotextile by needle punching technology, which can realize the batch production of bio-self-repairing composite geotextiles, reduce production costs, and improve production efficiency.

[0009] In some embodiments, the polypropylene fiber geotextile comprises polypropylene fibers, and the polypropylene fiber geotextile is formed by needle punching connection of polypropylene fibers, so that the polypropylene fiber geotextile has high strength.

[0010] Adopting the above scheme, the polypropylene fiber has good acid and alkali resistance, the tensile strength is between 500-700 MPa, the elongation at break is between 13-15%, and the production process of polypropylene is simple, and the cost is lower than that of carbon fiber. Therefore, the polypropylene fiber geotextile has the characteristics of anti-aging, corrosion resistance, acid and alkali resistance, and good water permeability, providing good strength characteristics for the bio-self-healing geotextile.

[0011] In some embodiments, the bio-composite fiber geotextile comprises synthetic fibers and animal and plant fibers, and the bio-composite fiber geotextile is formed by needle punching connection of synthetic fibers and animal and plant fibers.

[0012] In some embodiments, before the needle punching process, the synthetic fibers and animal and plant fibers are infiltrated with a saturated calcium chloride solution to provide a better environment for microbial-induced carbonate precipitation.

[0013] In some embodiments, the synthetic fibers include polypropylene fibers and jute fibers, and the animal and plant fibers include wool fibers; moreover, the polypropylene fibers in the bio-composite fiber geotextile account for 40%, the jute fibers account for 40%, and the wool fibers account for 20%.

[0014] Adopting the above scheme, the polypropylene fibers provide good strength characteristics. After the jute fibers are decomposed, they can enhance the anti-permeability ability of bacteria. After the wool fibers are decomposed, they can provide nitrogen fertilizer for microbial decomposition in the long term and also have tear resistance.

[0015] In some embodiments, the bio-self-healing geotextile is infiltrated in the microbial suspension required for soil solidification, so that the microorganisms are fully adsorbed on the surface of the geotextile.

[0016] In some embodiments, the microbial suspension includes a Bacillus subtilis suspension.

[0017] Specifically, the MICP technology, namely the microbial-induced calcium carbonate precipitation technology, is a process that uses microbial activities to promote calcium carbonate precipitation, thereby improving the physical and chemical properties of soil or materials; this technology mainly induces the precipitation of calcium carbonate in the environment through the action of bacteria, and then consolidates the soil or repairs the materials.

[0018] Adopting the above - mentioned scheme, the synthetic fibers and animal and plant fibers infiltrated and saturated with calcium chloride solution are made into a bio - composite fiber geotextile, providing a better environment for microbial - induced carbonate precipitation; the prepared bio - self - repairing geotextile is immersed in a Bacillus subtilis microbial suspension to endow it with self - repairing ability. In the case of damage and erosion in the project, the bio - self - repairing geotextile can adapt to the scouring in various engineering constructions to prevent problems such as rupture and non - fitting with the soil layer of the composite geotextile after the project is damaged during use; based on the MICP technology, the service life of the bio - self - repairing geotextile is extended, enabling it to adapt to various different harsh environments and having a wide range of engineering application scenarios.

[0019] In some embodiments, a plurality of the bio - self - repairing geotextiles are fixed on the soil slope through anchor bolts; a plurality of the bio - self - repairing geotextiles are sequentially fixed on the soil slope in a stepped shape from top to bottom; and each of the bio - self - repairing geotextiles is fixed on the soil slope through two anchor bolts.

[0020] Adopting the above - mentioned scheme, the scientific structure of fixing the bio - self - repairing geotextile on the soil slope in a stepped manner by using anchor bolts enhances the bearing capacity and tensile performance of the bio - self - repairing geotextile; at the same time, it prevents the geotextile from being damaged due to elastic deformation, thereby enhancing the mechanical properties of the bio - self - repairing geotextile and enabling it to adapt to the wet environment.

[0021] A construction method of a bio - self - repairing geotextile applicable to soil slopes of the present utility model includes the following steps:

[0022] (1) Prepare the bio - self - repairing geotextile: The polypropylene fibers are made into a polypropylene fiber geotextile through a needling process. At the same time, the polypropylene fibers, jute fibers, and wool fibers soaked in a saturated calcium chloride solution are made into a bio - composite fiber geotextile through a needling process; the polypropylene fiber geotextile is stacked on the bio - composite fiber geotextile, and the polypropylene fiber geotextile and the bio - composite fiber geotextile are connected into one body by using the needling technology; the bio - composite fiber geotextile is stacked on the polypropylene fiber geotextile, and the bio - composite fiber geotextile and the polypropylene fiber geotextile and the bio - composite fiber geotextile that have been connected into one body are connected into one body by using the needling process; thus, a structure is formed in which two layers of bio - composite fiber geotextiles sandwich a layer of polypropylene fiber geotextile.

[0023] (2) Immerse the prepared bio - self - repairing geotextile in a high - concentration Bacillus subtilis suspension to allow Bacillus subtilis to fully adsorb on the surface of the geotextile; then cultivate it under appropriate temperature and humidity conditions to enable Bacillus subtilis to reproduce on the surface of the geotextile.

[0024] (3) Remove sundries such as loose stones, loose layers, weeds, withered branches and fallen leaves, and garbage on the slope surface of the soil slope. The bio-self-repair geotextile is in a stepped shape and is fixed on the surface of the soil slope by anchor bolts to ensure that the bio-self-repair geotextile fully adheres to the soil slope, reducing the possibility of rainwater directly entering the interior of the soil slope and preventing soil collapse.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the utility model designs a bio-self-repair geotextile applicable to soil slopes.

[0027] (1) The utility model uses a needling technique to connect a bio-composite fiber geotextile, a polypropylene fiber geotextile, and a bio-composite fiber geotextile into a bio-self-repair geotextile, which can realize the batch production of bio-self-repair composite geotextiles, reduce production costs, and improve production efficiency.

[0028] (2) The synthetic fibers of the polypropylene fiber geotextile and the bio-composite fiber geotextile of the utility model contain polypropylene fibers. Polypropylene fibers have good acid and alkali resistance, a tensile strength between 500 - 700 MPa, an elongation at break between 13 - 15%, and a simple production process for polypropylene, with a lower cost compared to carbon fiber. This enables the polypropylene fiber geotextile to have the characteristics of anti-aging, corrosion resistance, acid and alkali resistance, and good water permeability, providing good strength characteristics for the bio-self-repair geotextile.

[0029] (3) The polypropylene fibers in the bio-composite fiber geotextile of the utility model provide good strength characteristics. After the jute fibers decompose, they can enhance the anti-permeability ability of bacteria, and after the wool fibers decompose, they can provide nitrogen fertilizer for the long-term decomposition of microorganisms, and also have tear resistance.

[0030] (4) The utility model makes a bio-composite fiber geotextile from synthetic fibers and animal and plant fibers infiltrated and saturated with calcium chloride solution, providing a better environment for microbial-induced carbonate precipitation. The made bio-self-repair geotextile is immersed in a Bacillus subtilis microbial suspension to endow it with self-repair ability. In the case of damage and erosion in the project, the bio-self-repair geotextile can adapt to the scouring in various engineering constructions to prevent problems such as rupture and non-conformity with the soil layer of the composite geotextile after the project is damaged during use. Based on the MICP technology, the service life of the bio-self-repair geotextile is extended, enabling it to adapt to various different harsh environments and having a wide range of engineering application scenarios.

[0031] (5) The utility model adopts a scientific structure of fixing the bio-self-repair geotextile on the soil slope in a stepped manner with anchor bolts, enhancing the bearing capacity and tensile performance of the bio-self-repair geotextile. At the same time, it prevents the geotextile from being damaged due to elastic deformation, thereby enhancing the mechanical properties of the bio-self-repair geotextile and enabling it to adapt to a humid environment. Brief Description of the Drawings

[0032] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0033] Figure 1 It is a schematic diagram of the bio-self-repairing geotextile of the present utility model fixed on a soil slope;

[0034] Figure 2 It is a schematic cross-sectional structure diagram of a bio-self-repairing geotextile applicable to soil slopes of the present utility model.

[0035] The corresponding component names for the reference numerals in the drawings are: 1. Bio-self-repairing geotextile; 1-1. Bio-composite fiber geotextile; 1-2. Polypropylene fiber geotextile; 2. Anchor rod; 3. Soil slope. Detailed Description of the Embodiments

[0036] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] The following illustrates the embodiments of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The present application can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without 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 those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.

[0039] It should be noted that the following description relates to 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 specific structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art should 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 an apparatus and / or practice a method. Additionally, this apparatus and / or method can be implemented using other structures and / or functionality in addition to one or more of the aspects set forth herein.

[0040] It should also be noted that the diagrams provided in the following embodiments only illustrate the basic concept of this application schematically. Only the components related to this application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the layout type of its components may also be more complex.

[0041] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the examples can be practiced without these specific details.

[0042] The following describes the technical solutions provided by each embodiment of this application in conjunction with the accompanying drawings.

[0043] As Figure 1 - Figure 2 shown, the present utility model provides a bio-self-repairing geotextile applicable to soil slopes, which is fixed on the soil slope surface 3 by anchor bolts 2. The bio-self-repairing geotextile 1 includes two layers of bio-composite fiber geotextiles 1-1 arranged up and down, and a layer of polypropylene fiber geotextile 1-2 disposed between the two layers of bio-composite fiber geotextiles 1-1; moreover, the bio-self-repairing geotextile 1 is formed by needle punching connection of the bio-composite fiber geotextile 1-1, polypropylene fiber geotextile 1-2, and bio-composite fiber geotextile 1-1 arranged in sequence from top to bottom. With the above solution, the bio-composite fiber geotextile 1-1, polypropylene fiber geotextile 1-2, and bio-composite fiber geotextile 1-1 are connected into a bio-self-repairing geotextile 1 by needle punching technology; mass production of the bio-self-repairing composite geotextile can be achieved, production costs can be reduced, and production efficiency can be improved.

[0044] In some embodiments, the polypropylene fiber geotextile 1-2 comprises polypropylene fibers, and the polypropylene fiber geotextile 1-2 is formed by needle punching connection of polypropylene fibers, so that the polypropylene fiber geotextile 1-2 has high strength. With the above scheme, the polypropylene fiber has good acid and alkali resistance, the tensile strength is between 500-700 MPa, the elongation at break is between 13-15%, and the polypropylene production process is simple, with lower cost compared to carbon fiber, so that the polypropylene fiber geotextile 1-2 has the characteristics of anti-aging, corrosion resistance, acid and alkali resistance, and good water permeability, providing good strength characteristics for the bio-self-repairing geotextile 1.

[0045] In some embodiments, the bio-composite fiber geotextile 1-1 comprises synthetic fibers and animal and plant fibers, and the bio-composite fiber geotextile 1-1 is formed by needle punching connection of synthetic fibers and animal and plant fibers. In some embodiments, before the needle punching process, the synthetic fibers and animal and plant fibers are infiltrated with a saturated calcium chloride solution to provide a better environment for microbial-induced carbonate precipitation. Among them, the concentration of the saturated calcium chloride solution is 1 mol / L. In some embodiments, the synthetic fibers include polypropylene fibers and jute fibers, and the animal and plant fibers include wool fibers; and the proportion of polypropylene fibers in the bio-composite fiber geotextile 1-1 is 40%, the proportion of jute fibers is 40%, and the proportion of wool fibers is 20%. With the above scheme, the polypropylene fibers provide good strength characteristics, the jute fibers can enhance the anti-permeability ability of bacteria after decomposition, the wool fibers can provide nitrogen fertilizer for microbial decomposition in the long term after decomposition, and also have tear resistance.

[0046] In some embodiments, the bio-self-healing geotextile 1 is immersed in the microbial suspension required for soil solidification so that microorganisms are fully adsorbed on the surface of the geotextile. In some embodiments, the microbial suspension includes a Bacillus subtilis suspension, and the concentration of the Bacillus subtilis suspension is OD600 = 1.0. Specifically, the MICP technology, namely the microbial-induced calcium carbonate precipitation technology, is a process that uses microbial activities to promote calcium carbonate precipitation, thereby improving the physical and chemical properties of soil or materials; this technology mainly induces the precipitation of calcium carbonate in the environment through the action of bacteria, and then reinforces the soil or repairs the materials. By adopting the above scheme, the synthetic fiber and animal and plant fiber impregnated with a saturated calcium chloride solution are made into the bio-composite fiber geotextile 1-1, which provides a better environment for microbial-induced carbonate precipitation; the prepared bio-self-healing geotextile 1 is immersed in the Bacillus subtilis microbial suspension to make it have self-healing ability. In the case of damage and erosion in the project, the bio-self-healing geotextile 1 can adapt to the scouring in various engineering constructions to prevent problems such as rupture and non-fitting with the soil layer of the composite geotextile after the project is damaged during use; based on the MICP technology, the service life of the bio-self-healing geotextile 1 is extended, enabling it to adapt to various different harsh environments and having a broad engineering application scenario.

[0047] In some embodiments, a plurality of the bio-self-healing geotextiles 1 are fixed on the soil slope 3 by anchor bolts 2; a plurality of the bio-self-healing geotextiles 1 are sequentially fixed on the soil slope 3 in a stepped manner from top to bottom; and each of the bio-self-healing geotextiles 1 is fixed on the soil slope 3 by two anchor bolts 2. By adopting the above scheme, the scientific structure of fixing the bio-self-healing geotextile 1 on the soil slope in a stepped manner by the anchor bolts 2 enhances the bearing capacity and tensile performance of the bio-self-healing geotextile 1; at the same time, it prevents the geotextile from being damaged due to elastic deformation, thereby enhancing the mechanical properties of the bio-self-healing geotextile 1 and enabling it to adapt to the environment in a wet state.

[0048] A construction method of a bio-self-healing geotextile applicable to soil slopes of the present utility model includes the following steps:

[0049] (1) Preparation of the bio-self-healing geotextile 1: The polypropylene fiber is made into a polypropylene fiber geotextile 1-2 through a needling process. At the same time, the polypropylene fiber, jute fiber, and wool fiber soaked in a saturated calcium chloride solution are made into a bio-composite fiber geotextile 1-1 through a needling process. The polypropylene fiber geotextile 1-2 is stacked on the bio-composite fiber geotextile 1-1, and the polypropylene fiber geotextile 1-2 and the bio-composite fiber geotextile 1-1 are connected into one body by using the needling technique. The bio-composite fiber geotextile 1-1 is pasted and stacked on the polypropylene fiber geotextile 1-2, and the bio-composite fiber geotextile 1-1 and the polypropylene fiber geotextile 1-2 and the bio-composite fiber geotextile 1-1 that have been connected into one body are connected into one body by using the needling process. Thus, a structure is formed in which two layers of bio-composite fiber geotextiles 1-1 sandwich a layer of polypropylene fiber geotextile 1-2.

[0050] (2) The prepared bio-self-healing geotextile 1 is soaked in a high-concentration Bacillus subtilis suspension so that Bacillus subtilis is fully adsorbed on the surface of the geotextile. Then, it is cultured under appropriate temperature and humidity conditions so that Bacillus subtilis propagates on the surface of the geotextile.

[0051] (3) Debris such as floating stones, loose layers, weeds, dead branches and leaves, and garbage on the slope surface of the soil slope is removed. The bio-self-healing geotextile 1 is in a stepped shape and is fixed on the surface of the soil slope by using the anchor rod 2 to ensure that the bio-self-healing geotextile 1 fully adheres to the soil slope, so as to reduce the possibility of rainwater directly entering the interior of the soil slope and prevent the soil body from collapsing.

[0052] The following gives a specific application scenario of the bio-self-healing geotextile of the present utility model, but it is not limited thereto: The bio-self-healing geotextile is transported from the factory to the soil slope. Before laying the bio-self-healing geotextile, the surface of the soil slope is cleared, graded, and compacted. The area of the soil slope to be laid is processed into a stepped shape. When starting to lay, the bio-self-healing geotextile is spread out manually, and it is strictly prohibited for any vehicles and machines to directly pass on the geotextile. Lay one layer and fix it with an anchor rod layer by layer, and so on. When laying the geotextile, attention should be paid to making it closely adhere to the slope surface, and the joints of the geotextile should be overlapped to enhance the slope protection effect.

[0053] For the same or similar parts among the various embodiments in this specification, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0054] The above is only the specific implementation manner 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 those skilled in the art within the technical scope disclosed in the present application should be covered by 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 biorepairing geotextile suitable for soil slopes, fixed on the soil slope surface (3) by anchor rods (2), characterized in that: The biorepairing geotextile (1) comprises two layers of biocomposite fiber geotextile (1-1) arranged one above the other, and a layer of polypropylene fiber geotextile (1-2) arranged between the two layers of the biocomposite fiber geotextile (1-1); and the biorepairing geotextile (1) is formed by the biocomposite fiber geotextile (1-1), the polypropylene fiber geotextile (1-2) and the biocomposite fiber geotextile (1-1) arranged in sequence from top to bottom, connected by needle punching.

2. The bioremediation geotextile suitable for soil slopes according to claim 1, characterized in that: The polypropylene fiber geotextile (1-2) comprises polypropylene fibers, and the polypropylene fiber geotextile (1-2) is formed by connecting the polypropylene fibers through needle punching.

3. The bioremediation geotextile suitable for soil slopes according to claim 1, characterized in that: A plurality of the biorepairing geotextiles (1) are fixed on the soil slope surface (3) via anchor rods (2); the plurality of the biorepairing geotextiles (1) are fixed on the soil slope surface (3) in a step-like manner from top to bottom; and each of the biorepairing geotextiles (1) is fixed on the soil slope surface (3) via two anchor rods (2).

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