Coastal anti-scour fill embankment slope protection structure and construction method

Abstract

The invention discloses a coastal anti-scour fill embankment slope protection structure and a construction method. The coastal anti-scour fill embankment slope protection structure comprises an embankment slope protection body, and the embankment slope protection body comprises first geotechnical cloth, a plurality of sand filling pipe bags, second geotechnical cloth, a sand cushion layer and wave absorbing blocks; the first geotechnical cloth is sequentially arranged between the side slope and the sand cushion layer, between the side slope and the sand filling pipe bag, between the seabed and the sand filling pipe bag and between the seabed and the sand cushion layer in the extending direction from the side slope to the seabed. A plurality of sand filling pipe bags are arranged above the first geotechnical cloth; the second geotechnical cloth is arranged above the first geotechnical cloth; gaps are formed between every two adjacent sand filling pipe bags, between the sand filling pipe bags and the first geotechnical cloth and between the sand filling pipe bags and the second geotechnical cloth, and the gaps are filled with biological cement reinforcing sandy soil; the sand cushion layer is arranged above the second geotechnical cloth; and the wave absorbing blocks are arranged above the sand cushion layer.

Description

Technical Field

[0001] The present invention relates to the technical field of coastal fill embankment slope protection, and in particular to a coastal anti-scour fill embankment slope protection structure and a construction method. Background Art

[0002] With the vigorous development of my country's economy, the general highway system has been continuously improved, and the highway service functions have been continuously enhanced, which has promoted the integration process of various regions. As a key link connecting coastal cities and regions, coastal highways have not only effectively alleviated traffic pressure and stimulated the development of tourism, but also greatly promoted regional economic integration and coordinated development, and accelerated the optimization and upgrading of the industrial structure. The construction of coastal highways actively promotes the integration of transportation and tourism industries, accelerates the construction of a "highway +" development pattern, and promotes the deep integration of general national and provincial trunk highways with local industries, tourism, and rural revitalization. Therefore, further strengthening the construction of coastal highways is of great significance to the development of coastal areas.

[0003] Since coastal highways are located near the sea, they are inevitably subject to long-term erosion by seawater. The impact of waves will pose a serious threat to the roadbed fill under the road surface. Therefore, breakwaters need to be set up. The current breakwaters are mainly composed of sand cushion layers and cast-in-place blocks. They not only effectively weaken the impact of waves on the slope protection, but also prevent the erosion of the roadbed fill by seawater to a certain extent; however, this construction method still has the following shortcomings: 1. The labor cost required for cast-in-place blocks is high; 2. The high and low tides caused by tidal phenomena affect the grouting time and construction period of block construction, and the quality of the blocks cannot be guaranteed; 3. The block resources are insufficient and local materials cannot be used, resulting in high procurement costs.

[0004] Therefore, in order to further optimize the construction of breakwaters, save construction costs and enhance the strength of breakwaters, a simple and efficient coastal anti-scour fill embankment slope protection structure is urgently needed. 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 coastal anti-scour fill embankment slope protection structure and construction method, wherein sand-filled tube bags are used to compact the roadbed fill below the high water level, and biocement-reinforced sand is used to fill the gaps between the sand-filled tube bags. At the same time, wave-breaking blocks are arranged on the upper layer of the slope protection body to prevent waves; the sand-filled tube bags and wave-breaking blocks have the functions of compaction and wave prevention, and compared with cast-in-place block stones, they have the characteristics of convenient material acquisition and efficient construction.

[0007] (2) Technical solution

[0008] The solution adopted by the present invention to solve the above technical problems is a coastal anti-scour fill embankment slope protection structure arranged on the slope and seabed. The coastal anti-scour fill embankment slope protection structure includes an embankment slope protection body, which includes a first geotextile, a plurality of sand-filled tube bags, a second geotextile, a sand cushion layer and wave-breaking blocks;

[0009] The first geotextile is sequentially arranged between the slope and the sand cushion layer, between the slope and the sand-filled tube bag, between the seabed and the sand-filled tube bag, and between the seabed and the sand cushion layer along the extension direction from the slope to the seabed;

[0010] The plurality of sand-filled tube bags are placed above the first geotextile; the plurality of sand-filled tube bags include multiple layers of sand-filled tube bags, each layer of sand-filled tube bags is sequentially arranged along a direction parallel to a connecting line between the side slope and the seabed, and the multiple layers of sand-filled tube bags are sequentially arranged along a direction extending from the side slope to the seabed, and the multiple layers of sand-filled tube bags are sequentially arranged from bottom to top along a direction perpendicular to the seabed; and the multiple layers of sand-filled tube bags are staggered in a direction perpendicular to the seabed and in a direction parallel to the connecting line between the side slope and the seabed;

[0011] The second geotextile is arranged above the first geotextile; and the two ends of the second geotextile that are farthest apart along the extension direction from the slope to the seabed are arranged closely to the first geotextile, and the portion between the two ends is arranged at a distance from the first geotextile to form a receiving space for receiving the plurality of sand-filled tube bags; and the second geotextile is arranged in sequence between the first geotextile and the sand cushion layer, between the sand-filled tube bags and the sand cushion layer, and between the first geotextile and the sand cushion layer along the extension direction from the slope to the seabed;

[0012] A gap is formed between every two adjacent sand-filled tube bags, between the sand-filled tube bag and the first geotextile, and between the sand-filled tube bag and the second geotextile, and the gap is filled with biocement reinforced sand;

[0013] The sand cushion layer is arranged above the second geotextile;

[0014] The wave-breaking block is arranged above the sand cushion layer.

[0015] Specifically, the staggered arrangement means that when the sand-filled tube bags are stacked in layers, the gaps formed between the sand-filled tube bags in any layer are staggered with the gaps formed between the sand-filled tube bags in an adjacent layer.

[0016] In some embodiments, the gap between the sand-filled tube bags in any layer is located at the center of the sand-filled tube bags in the adjacent layer, which helps to disperse the upper pressure of the sand-filled tube bags and enhance the integrity of the sand-filled tube bags. At the same time, the cross-placement can reduce the scouring surface and improve the anti-scouring ability of the sand-filled tube bags.

[0017] With the above solution, the sand-filled tube bags are easy to construct. Compared with stone, the sand in the sand-filled tube bags can be directly obtained by blowing and filling, which reduces the transportation time and cost. The sand-filled tube bags use a mud pump to pump sand for in-situ filling, which greatly reduces human resources.

[0018] In some embodiments, the embankment slope protection body includes a first slope protection body located below the high water line, and a second slope protection body located above the high water line;

[0019] The first slope protection body is arranged on the slope and the seabed, and the first slope protection body includes, from the inside to the outside, a first geotextile, a plurality of sand-filled tube bags, a second geotextile, a sand cushion layer and wave-breaking blocks;

[0020] The second slope protection body is arranged on the slope, and the second slope protection body includes a first geotextile, a second geotextile, a sand cushion layer and a wave-breaking block arranged in sequence from the inside to the outside.

[0021] Specifically, the second slope protection body located above the high water mark is extended from the side slope away from the seabed to the bottom of the road surface.

[0022] It should be noted that the high water mark is designed according to different application scenarios.

[0023] With the above scheme, sand-filled tube bags are used to compact the roadbed below the high water level, and the gaps between the sand-filled tube bags are filled with biocement-reinforced sand. At the same time, wave-breaking blocks are arranged on the upper layer of the slope protection body to prevent waves. The sand-filled tube bags and wave-breaking blocks have the functions of compaction and wave prevention, and compared with cast-in-place block stones, they are easy to obtain materials and have high construction efficiency.

[0024] In some embodiments, the sand-filled tube bag is a long tube structure, and the cross-sections of the sand-filled tube bag at both ends along its length are arc-shaped, so that gaps are formed between every two adjacent sand-filled tube bags, between the sand-filled tube bag and the first geotextile, and between the sand-filled tube bag and the second geotextile.

[0025] By adopting the above solution, the gap can be filled with biocement reinforced sand to ensure the stability of the entire structure.

[0026] In some embodiments, the first geotextile, the second geotextile, and the bag body of the sand-filled tube bag are all made of high-strength composite materials; and multiple first geotextiles and multiple second geotextiles are arranged side by side along a direction parallel to the connecting line between the slope and the seabed; the overlap width between every two adjacent first geotextiles is not less than 1m, and the overlap width between every two adjacent second geotextiles is not less than 1m.

[0027] Specifically, the high-strength composite material can be glass fiber or polypropylene filament, which has excellent strength, acid and alkali resistance, and ductility. Its service life exceeds 50 years and is suitable for permanent slope protection projects. The materials of the geotextiles and sand-filled tube bags currently used in slope protection projects have a service life of no more than 20 years. The aging of the geotextiles and bag materials will pose a hidden danger to permanent slope protection projects.

[0028] By adopting the above solution, the connection stability between the first geotextiles and the second geotextiles can be ensured.

[0029] In some embodiments, the biocement reinforced sand comprises sand, mineralized microorganisms, and biofiber; and calcium chloride solution is added to the sand to induce the mineralized microorganisms.

[0030] In some embodiments, the mineralizing microorganism is selected from the facultative anaerobic Bacillus pasteurianus, which has a strong survival ability and is best suited to survive in an environment of 15-37°C and a pH of 9-10. The alkaline environment of seawater is conducive to the metabolism of the bacteria, thereby promoting rapid reinforcement of sand; the biofiber is selected from agricultural waste fibers such as rice straw and stalks.

[0031] In some embodiments, the soil material of the sand cushion layer is biocement reinforced sand.

[0032] By adopting the above scheme, the gaps between the sand-filled tube bags, the sand-filled tube bags and the first geotextile, and the sand-filled tube bags and the second geotextile are filled with biocement-reinforced sand, and the soil material of the sand cushion layer is biocement-reinforced sand. Through the metabolism of microorganisms, insoluble carbonates are induced to crystallize on the surface of the sand, thereby increasing the anti-permeability of the soil. This effectively solves the impact of seawater scouring on the gaps in the sand-filled tube bags, and ensures that after the bag body of the sand-filled tube bag is aged and damaged, the overall slope protection still has a stable and complete structure, solving the problem that after the bag body of the general geotextile and the sand-filled tube bag is damaged, the gaps between the bag bodies are not treated in time, which makes it easier for seawater erosion to accelerate.

[0033] In some embodiments, the wave-breaking block is made of concrete cast in a mold, and the edge of the wave-breaking block is smooth.

[0034] The solution adopted by the present invention to solve the above technical problems is a construction method of a coastal anti-scour fill embankment slope protection structure, comprising the following steps:

[0035] (1) Leveling the side slope and the seabed in the paving area of the main body of the embankment slope protection, arranging the first geotextile above the side slope and the seabed in the paving area of the main body of the embankment slope protection; and arranging a plurality of first geotextiles side by side in a direction parallel to the connecting line between the side slope and the seabed; the overlap width between each two adjacent first geotextiles arranged side by side is not less than 1m; and the top and bottom ends of each two adjacent first geotextiles are fixed by steel pipes;

[0036] (2) First, the surface of the first geotextile is placed on the seabed in the paving area of the main body of the embankment slope protection, close to the slope, and a layer of sand-filled tube bags is laid side by side along the direction of the connecting line between the slope and the seabed; then, multiple layers of sand-filled tube bags are laid in sequence from the slope to the seabed; and the adjacent two layers of sand-filled tube bags are staggered in the length direction;

[0037] (3) The gaps between the sand-filled tube bags and between the sand-filled tube bags and the slope are filled with biocement reinforced sand by pouring through a pumping device;

[0038] (4) The sand-filled tube bags need to be laid layer by layer, and the long and short sides of the sand-filled tube bags between the upper and lower layers are staggered and stacked. The number of sand-filled tube bags arranged in each layer is the same, ensuring that the slope of the water-facing slope formed after the sand-filled tube bags are stacked is the same as the slope of the side slope below the high water level line; based on this standard, repeat steps (2) and (3) for each layer until the stacking reaches the high water level line;

[0039] (5) pouring biocement reinforced sand from bottom to top in the gaps between the water-facing slopes of the sand-filled tube bags, and compacting the water-facing slopes with a hydraulic vibration compactor;

[0040] (6) The second geotextile is laid side by side along the direction of the connecting line between the side slope and the seabed, on the top of the side slope and the sand-filled tube bag, on the water-facing slope of the sand-filled tube bag, and above the first geotextile that is close to the seabed; and the overlap width between each two adjacent second geotextiles arranged side by side is not less than 1m; the first geotextile and the second geotextile are fixed with steel pipes at the overlapping part between the side slope and the seabed;

[0041] (7) pouring sand and soil above the first geotextile and the second geotextile in the sand-filled tube bag above the high water mark to set a sand cushion layer, and compacting the sand cushion layer by a hydraulic vibrating compactor;

[0042] (8) Arrange the wave-breaking blocks on top of the sand cushion layer using lifting equipment.

[0043] In some embodiments, in step (3), the biocement reinforced sand is mixed with the sand containing biofiber and the microorganisms that can induce mineralization by spraying. The steps are: first spraying the microorganism suspension that can induce mineralization on the surface of the sand, then spraying calcium chloride and urea solution, repeating the above steps for a second spraying, so that the microorganisms that can induce mineralization and the sand are fully mixed to complete the preparation of the biocement reinforced sand.

[0044] In some embodiments, in step (5) and step (7), the biocement reinforced sand and sand cushion layer should be filled during low tide to reduce the loss of sand during the filling process due to water erosion.

[0045] (3) Beneficial effects

[0046] Compared with the existing technology, the present invention designs a coastal anti-scour fill embankment slope protection structure and construction method.

[0047] (1) The present invention uses sand-filled tube bags to compact the roadbed below the high water mark, and uses biocement-reinforced sand to fill the gaps between the sand-filled tube bags. At the same time, wave-breaking blocks are arranged on the upper layer of the slope protection body to prevent waves. The sand-filled tube bags and wave-breaking blocks have the functions of compaction and wave prevention, and compared with cast-in-place block stones, they have the characteristics of convenient material acquisition and high construction efficiency.

[0048] (2) The multi-layer sand-filled tube bags of the present invention are staggered in a direction perpendicular to the seabed and in a direction parallel to the connecting line between the slope and the seabed, which helps to disperse the upper pressure of the sand-filled tube bags and enhance the integrity of the sand-filled tube bags. At the same time, the cross-placement can reduce the scouring surface and improve the anti-scouring ability of the sand-filled tube bags.

[0049] (3) The sand-filled tube bag used in the present invention is convenient for construction. Compared with stone materials, the sand in the sand-filled tube bag can be directly obtained by blowing and filling, which reduces the time and cost of transportation. The sand-filled tube bag adopts a slurry pump to pump the sand for in-situ filling, which greatly reduces human resources.

[0050] (4) The first geotextile, the second geotextile, and the bag body of the sand-filled tube bag of the present invention are all made of high-strength composite materials; such as glass fiber or polypropylene filament materials, which have excellent strength, acid and alkali resistance, and ductility. Their service life exceeds 50 years and are suitable for permanent slope protection projects. However, the materials of the geotextiles and sand-filled tube bags currently used in slope protection projects have a service life of no more than 20 years. The aging of the geotextiles and bag materials will cause hidden dangers to permanent slope protection projects.

[0051] (5) The mineralized microorganisms of the present invention are selected from the facultative anaerobic Bacillus pasteurianus. Bacillus pasteurianus has a strong survival ability and is most suitable for living in an environment of 15-37°C and a pH of 9-10. The alkaline environment of seawater is conducive to the metabolism of the bacteria, thereby promoting the rapid reinforcement of sand soil.

[0052] (6) The gaps between the sand-filled tube bags, the sand-filled tube bags and the first geotextile, and the sand-filled tube bags and the second geotextile of the present invention are filled with biocement-reinforced sand, and the soil material of the sand cushion layer adopts biocement-reinforced sand. Through the metabolism of microorganisms, insoluble carbonates are induced to crystallize on the surface of the sand, thereby increasing the anti-permeability performance of the soil. This effectively solves the influence of seawater scouring on the gaps of the sand-filled tube bags, and can ensure that after the bag body of the sand-filled tube bag is aged and damaged, the overall slope protection still has a stable and complete structure, solving the problem that after the bag body of the general geotextile and the sand-filled tube bag is damaged, the gaps between the bag bodies are not handled in time, which makes it easier for seawater erosion to accelerate. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] 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.

[0054] Figure 1 This is a cross-sectional view of a coastal anti-scour fill embankment slope protection structure of the present invention;

[0055] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0056] Figure 3 for Figure 1 Cross-sectional view at the middle BB;

[0057] Figure 4 Schematic diagram of the composition of biocement reinforced sand of the present invention.

[0058] The names of the components corresponding to the various figure marks in the figure are: 1. Embankment slope protection body; 1-1. First geotextile; 1-2. Sand-filled tube bag; 1-3. Biocement reinforced sand; 1-3-1. Sand; 1-3-2. Microorganisms; 1-3-3. Biofiber; 1-4. Second geotextile; 1-5. Sand cushion layer; 1-6. Wave-breaking block; 2. Seabed; 3. Slope; 4. Road surface. DETAILED DESCRIPTION

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0066] like Figures 1-4As shown, the present invention provides a coastal anti-scour fill embankment slope protection structure, which is arranged on the slope 3 and the seabed 2. The coastal anti-scour fill embankment slope protection structure includes an embankment slope protection body 1, and the embankment slope protection body 1 includes a first geotextile 1-1, a plurality of sand-filled tube bags 1-2, a second geotextile 1-4, a sand cushion layer 1-5 and a wave-breaking block 1-6; the first geotextile 1-1 is sequentially arranged between the slope 3 and the sand cushion layer 1-5, between the slope 3 and the sand-filled tube bag 1-2, between the seabed 2 and the sand-filled tube bag 1-2, and between the seabed 2 and the sand-filled tube bag 1-2. and between the seabed 2 and the sand cushion layer 1-5; the plurality of sand-filled tube bags 1-2 are placed above the first geotextile 1-1; the plurality of sand-filled tube bags 1-2 include multiple layers of sand-filled tube bags 1-2, each layer of sand-filled tube bags 1-2 is sequentially arranged along a direction parallel to the connecting line between the slope 3 and the seabed 2, and the multiple layers of sand-filled tube bags 1-2 are sequentially arranged along the direction extending from the slope 3 to the seabed 2, and the multiple layers of sand-filled tube bags 1-2 are sequentially arranged from bottom to top along a direction perpendicular to the seabed 2; and the multiple layers of sand-filled tube bags 1-2 are arranged in a direction perpendicular to the seabed 2. , and are staggered in a direction parallel to the connecting line of the slope 3 and the seabed 2; the second geotextile 1-4 is arranged above the first geotextile 1-1; and the two ends of the second geotextile 1-4 that are farthest apart along the extending direction from the slope 3 to the seabed 2 are arranged closely to the first geotextile 1-1, and the part between the two ends is arranged at a distance from the first geotextile 1-1 to form a receiving space for receiving the plurality of sand-filled tube bags 1-2; and the second geotextile 1-4 is sequentially arranged along the extending direction from the slope 3 to the seabed 2 The sand-filled tube bags 1-2 are arranged between the first geotextile 1-1 and the sand cushion layer 1-5, between the sand-filled tube bags 1-2 and the sand cushion layer 1-5, and between the first geotextile 1-1 and the sand cushion layer 1-5; a gap is formed between every two adjacent sand-filled tube bags 1-2, between the sand-filled tube bags 1-2 and the first geotextile 1-1, and between the sand-filled tube bags 1-2 and the second geotextile 1-4, and the gap is filled with biocement reinforced sand 1-3; the sand cushion layer 1-5 is arranged above the second geotextile 1-4; the wave-breaking blocks 1-6 are arranged above the sand cushion layer 1-5. Specifically, the staggered arrangement means that when the sand-filled tube bags 1-2 are stacked in layers, the gaps formed between the sand-filled tube bags 1-2 of any layer are staggered with the gaps formed between the sand-filled tube bags 1-2 of the adjacent layer. In some embodiments, the gap between the sand-filled tube bags 1-2 of any layer is located at the center of the sand-filled tube bags 1-2 of the adjacent layer, which helps to disperse the upper pressure of the sand-filled tube bags 1-2 and enhance the integrity of the sand-filled tube bags 1-2. At the same time, the cross-placement can reduce the scouring surface and improve the scouring resistance of the sand-filled tube bags 1-2.With the above solution, the sand-filled tube bag 1-2 is easy to construct. Compared with stone, the sand 1-3-1 in the sand-filled tube bag 1-2 can be directly obtained by blowing and filling, which reduces the time and cost of transportation. The sand-filled tube bag 1-2 uses a mud pump to pump the sand 1-3-1 for in-situ filling, which greatly reduces human resources.

[0067] In some embodiments, the embankment slope protection body 1 includes a first slope protection body located below the high water mark and a second slope protection body located above the high water mark. The first slope protection body is arranged on the slope 3 and the seabed 2 and includes, from the inside out, a first geotextile 1-1, a plurality of sand-filled tube bags 1-2, a second geotextile 1-4, a sand cushion layer 1-5, and wave-breaking blocks 1-6. The second slope protection body is arranged on the slope 3 and includes, from the inside out, a first geotextile 1-1, a second geotextile 1-4, a sand cushion layer 1-5, and wave-breaking blocks 1-6. Specifically, the second slope protection body located above the high water mark extends from the slope 3 away from the seabed 2 to the bottom of the road surface 4. By adopting the above scheme, the roadbed fill below the high water level is compacted using sand-filled tube bags 1-2, the gaps between the sand-filled tube bags 1-2 are filled with biocement reinforced sand 1-3, and at the same time, wave-breaking blocks 1-6 are arranged on the upper layer of the slope protection body for wave protection; the sand-filled tube bags 1-2 and wave-breaking blocks 1-6 have the functions of compaction and wave protection, and compared with cast-in-place block stones, they have the characteristics of convenient material acquisition and efficient construction.

[0068] In some embodiments, the sand-filled tube bag 1-2 is an elongated tube structure, and the cross-sections of the sand-filled tube bag 1-2 along its length are arc-shaped, so that gaps are formed between each two adjacent sand-filled tube bags 1-2, between the sand-filled tube bag 1-2 and the first geotextile 1-1, and between the sand-filled tube bag 1-2 and the second geotextile 1-4. With this solution, the gaps can be filled with biocement-reinforced sand 1-3 to ensure the stability of the entire structure.

[0069] In some embodiments, the first geotextile 1-1, the second geotextile 1-4, and the bag body of the sand-filled tube bag 1-2 are all made of high-strength composite materials; multiple first geotextiles 1-1 and multiple second geotextiles 1-4 are arranged side by side along a direction parallel to the connecting line between the slope 3 and the seabed 2; the overlap width between each two adjacent first geotextiles 1-1 is not less than 1m, and the overlap width between each two adjacent second geotextiles 1-4 is not less than 1m. Specifically, the high-strength composite material can be glass fiber or polypropylene filament, which has excellent strength, acid and alkali resistance, and ductility, and has a service life of more than 50 years, making it suitable for permanent slope protection projects. However, the materials of existing geotextiles and sand-filled tube bags 1-2 used in slope protection projects have a service life of no more than 20 years, and the aging of the geotextile and bag materials will pose a hidden danger to permanent slope protection projects. The above solution can ensure the stability of the connection between the first geotextiles 1-1 and the second geotextiles 1-4.

[0070] In some embodiments, the biocement-reinforced sand 1-3 includes sand 1-3-1, mineralized microorganisms 1-3-2, and biofiber 1-3-3; furthermore, a calcium chloride solution is added to the sand 1-3-1 to induce the mineralized microorganisms 1-3-2. In some embodiments, the mineralized microorganism 1-3-2 is selected from the facultative anaerobic Bacillus pasteurianus. Bacillus pasteurianus has strong viability and is best suited to living in an environment of 15-37°C and a pH of 9-10. The alkaline environment of seawater is conducive to the metabolism of the bacteria, thereby promoting the rapid reinforcement of the sand 1-3-1; the biofiber 1-3-3 is selected from agricultural waste fibers such as straw and stalks. The concentration of the calcium chloride solution is 1 mol / L, and the concentration of the Bacillus pasteurianus bacterial solution is OD600 = 1.0. In some embodiments, the soil material of the sand cushion layer 1-5 is biocement-reinforced sand 1-3. By adopting the above scheme, the gaps between the sand-filled tube bags 1-2 and the sand-filled tube bags 1-2, the sand-filled tube bags 1-2 and the first geotextile 1-1, and the sand-filled tube bags 1-2 and the second geotextile 1-4 are filled with biocement-reinforced sand 1-3, and the soil material of the sand cushion layer 1-5 is biocement-reinforced sand 1-3. Through the metabolism of microorganisms 1-3-2, insoluble carbonates are induced to crystallize on the surface of the sand 1-3-1, thereby increasing the soil's impermeability. This effectively solves the impact of seawater scouring on the gaps of the sand-filled tube bags 1-2, and ensures that after the bag body of the sand-filled tube bags 1-2 is aged and damaged, the slope protection as a whole still has a stable and complete structure, solving the problem that after the general geotextile and the bag body of the sand-filled tube bags 1-2 are damaged, the gaps between the bag bodies are not promptly treated, which makes it easier for seawater erosion to accelerate. In some embodiments, the wave-breaking blocks 1-6 are made of concrete cast by a mold, and the edges of the wave-breaking blocks 1-6 are smooth.

[0071] The present invention provides a construction method for a coastal anti-scour fill embankment slope protection structure, comprising the following steps:

[0072] (1) Leveling the side slope 3 and the seabed 2 in the paving area of the embankment slope protection body 1, arranging the first geotextile 1-1 above the side slope 3 and the seabed 2 in the paving area of the embankment slope protection body 1; and arranging a plurality of first geotextiles 1-1 side by side in a direction parallel to the connecting line between the side slope 3 and the seabed 2; the overlap width between each two adjacent first geotextiles 1-1 arranged side by side is not less than 1m; and the top and bottom ends of each two adjacent first geotextiles 1-1 are fixed by steel pipes;

[0073] (2) First, the surface of the first geotextile 1-1 on the seabed 2 in the paving area of the embankment slope protection body 1 is close to the slope 3, and a layer of sand-filled tube bags 1-2 is laid side by side along the direction of the connecting line between the slope 3 and the seabed 2; then, multiple layers of sand-filled tube bags 1-2 are laid in sequence from the slope 3 to the seabed 2; and the adjacent two layers of sand-filled tube bags 1-2 are staggered in the length direction;

[0074] (3) The gaps between the sand-filled tube bags 1-2 and the gaps between the sand-filled tube bags 1-2 and the slope 3 are filled with biocement reinforced sand 1-3 by pouring through a pumping device;

[0075] (4) The sand-filled tube bags 1-2 need to be laid layer by layer, and the long sides and short sides of the sand-filled tube bags 1-2 between the upper and lower layers are staggered and stacked. The number of sand-filled tube bags 1-2 arranged in each layer is the same, ensuring that the slope of the water-facing slope formed after the sand-filled tube bags 1-2 are stacked is the same as the slope of the side slope 3 located below the high water level line; based on this standard, repeat steps (2) and (3) for each layer until the stacking reaches the high water level line;

[0076] (5) pouring biocement reinforced sand 1-3 from bottom to top in the gap between the water-facing slopes of the sand-filled tube bags 1-2, and compacting the water-facing slopes by a hydraulic vibration compactor;

[0077] (6) The second geotextiles 1-4 are laid side by side along the direction of the connecting line between the side slope 3 and the seabed 2, on the top of the side slope 3 and the sand-filled tube bag 1-2, on the water-facing slope of the sand-filled tube bag 1-2, and above the first geotextile 1-1 that is close to the seabed 2; and the overlap width between each two adjacent second geotextiles 1-4 arranged side by side is not less than 1m; the first geotextile 1-1 and the second geotextile 1-4 located on the side slope and the seabed 2 are fixed with steel pipes;

[0078] (7) pouring sand 1-3-1 above the first geotextile 1-1 and the second geotextile 1-4 above the high water mark on the sand-filled tube bag 1-2, setting a sand cushion layer 1-5, and compacting the sand cushion layer 1-5 by a hydraulic vibration compactor;

[0079] (8) Arrange the wave-breaking blocks 1-6 above the sand cushion layer 1-5 using lifting equipment.

[0080] In some embodiments, in the step (3), the biocement reinforced sand 1-3 is mixed with the sand 1-3-1 containing the biofiber 1-3-3 and the microorganism 1-3-2 that can induce mineralization by spraying. The steps are: first spraying the suspension of microorganism 1-3-2 that can induce mineralization on the surface of the sand 1-3-1, and then spraying calcium chloride and urea solution, repeating the above steps for a second spraying, so that the microorganism 1-3-2 that can induce mineralization is fully mixed with the sand 1-3-1, and completing the preparation of the biocement reinforced sand 1-3.

[0081] In some embodiments, in step (5) and step (7), the biocement reinforced sand 1-3 and the sand cushion layer 1-5 should be filled during low tide to reduce the loss of sand 1-3-1 during the dumping process due to water scouring. The same or 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.

[0082] 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 coastal anti-scour fill embankment slope protection structure, arranged on a slope (3) and a seabed (2), characterized by: The coastal scour filling embankment slope protection structure comprises an embankment slope protection body (1), wherein the embankment slope protection body (1) comprises a first geotextile (1-1), a plurality of sand-filled tube bags (1-2), a second geotextile (1-4), a sand cushion layer (1-5) and wave-breaking blocks (1-6); The first geotextile (1-1) is sequentially arranged between the side slope (3) and the sand cushion layer (1-5), between the side slope (3) and the sand-filled tube bag (1-2), between the seabed (2) and the sand-filled tube bag (1-2), and between the seabed (2) and the sand cushion layer (1-5) along the extension direction from the side slope (3) to the seabed (2); The plurality of sand-filled tube bags (1-2) are placed above the first geotextile (1-1); the plurality of sand-filled tube bags (1-2) include multiple layers of sand-filled tube bags (1-2), each layer of sand-filled tube bags (1-2) is sequentially arranged along a direction parallel to a connection line between the side slope (3) and the seabed (2), and the multiple layers of sand-filled tube bags (1-2) are sequentially arranged along a direction extending from the side slope (3) to the seabed (2), and the multiple layers of sand-filled tube bags (1-2) are sequentially arranged from bottom to top along a direction perpendicular to the seabed (2); and the multiple layers of sand-filled tube bags (1-2) are staggeredly arranged in a direction perpendicular to the seabed (2) and in a direction parallel to a connection line between the side slope (3) and the seabed (2); The second geotextile (1-4) is arranged above the first geotextile (1-1); and the two ends of the second geotextile (1-4) that are farthest apart along the extension direction from the slope (3) to the seabed (2) are arranged closely to the first geotextile (1-1), and the portion between the two ends is arranged at a distance from the first geotextile (1-1) to form a receiving space for receiving the plurality of sand-filled tube bags (1-2); and the second geotextile (1-4) is sequentially arranged between the first geotextile (1-1) and the sand cushion layer (1-5), between the sand-filled tube bags (1-2) and the sand cushion layer (1-5), and between the first geotextile (1-1) and the sand cushion layer (1-5) along the extension direction from the slope (3) to the seabed (2); A gap is formed between every two adjacent sand-filled tube bags (1-2), between the sand-filled tube bag (1-2) and the first geotextile (1-1), and between the sand-filled tube bag (1-2) and the second geotextile (1-4), and the gap is filled with biocement reinforced sand (1-3); The sand cushion layer (1-5) is arranged above the second geotextile (1-4); The wave-breaking block (1-6) is arranged above the sand cushion layer (1-5).

2. The coastal anti-scour fill embankment slope protection structure according to claim 1, characterized in that: The embankment slope protection body (1) comprises a first slope protection body located below the high water level, and a second slope protection body located above the high water level; The first slope protection body is arranged on the slope (3) and the seabed (2), and the first slope protection body comprises, from the inside out, a first geotextile (1-1), a plurality of sand-filled tube bags (1-2), a second geotextile (1-4), a sand cushion layer (1-5), and wave-breaking blocks (1-6); The second slope protection body is arranged on the slope (3), and comprises a first geotextile (1-1), a second geotextile (1-4), a sand cushion layer (1-5) and a wave-breaking block (1-6) arranged in sequence from the inside to the outside.

3. The coastal anti-scour fill embankment slope protection structure according to claim 1, characterized in that: The sand-filled tube bag (1-2) is a long tube structure, and the cross-sections of the two ends of the sand-filled tube bag (1-2) along its length direction are arc-shaped, so that gaps are formed between every two adjacent sand-filled tube bags (1-2), between the sand-filled tube bag (1-2) and the first geotextile (1-1), and between the sand-filled tube bag (1-2) and the second geotextile (1-4).

4. The coastal anti-scour fill embankment slope protection structure according to claim 1, characterized in that: The first geotextile (1-1), the second geotextile (1-4), and the bag body of the sand-filled tube bag (1-2) are all made of high-strength composite materials; and a plurality of first geotextiles (1-1) and a plurality of second geotextiles (1-4) are arranged side by side in a direction parallel to a connecting line between the slope (3) and the seabed (2); the overlap width between each two adjacent first geotextiles (1-1) is not less than 1m, and the overlap width between each two adjacent second geotextiles (1-4) is not less than 1m.

5. The coastal anti-scour fill embankment slope protection structure according to claim 1, characterized in that: The biocement reinforced sand (1-3) comprises sand (1-3-1), mineralized microorganisms (1-3-2) and biofiber (1-3-3); and calcium chloride solution is added to the sand (1-3-1) to induce the mineralized microorganisms (1-3-2).

6. The coastal anti-scour fill embankment slope protection structure according to claim 1, characterized in that: The soil material of the sand cushion layer (1-5) is biocement reinforced sand (1-3).

7. The coastal anti-scour fill embankment slope protection structure according to claim 1, characterized in that: The wave-breaking block (1-6) is made of concrete cast in a mold, and the edge of the wave-breaking block (1-6) is smooth.

8. A construction method for a coastal anti-scour fill embankment slope protection structure, characterized by: The following steps are involved: (1) Leveling the side slope (3) and the seabed (2) in the paving area of the embankment slope protection body (1), arranging the first geotextile (1-1) above the side slope (3) and the seabed (2) in the paving area of the embankment slope protection body (1); and arranging a plurality of first geotextiles (1-1) side by side in a direction parallel to the connecting line of the side slope (3) and the seabed (2); the overlap width between each two adjacent first geotextiles (1-1) arranged side by side is not less than 1m; and the top and bottom ends of each two adjacent first geotextiles (1-1) are fixed by steel pipes; (2) First, a first geotextile (1-1) is laid on the seabed (2) in the laying area of the embankment slope protection body (1), with the surface close to the slope (3), and a layer of sand-filled tube bags (1-2) is laid side by side along the direction of the connecting line between the slope (3) and the seabed (2); then, multiple layers of sand-filled tube bags (1-2) are laid in sequence from the slope (3) to the seabed (2); and adjacent layers of sand-filled tube bags (1-2) are staggered in the length direction; (3) filling the gaps between the sand-filled tube bags (1-2) and between the sand-filled tube bags (1-2) and the slope (3) with biocement reinforced sand (1-3) by pouring through a pumping device; (4) The sand-filled tube bags (1-2) need to be laid layer by layer, and the long sides and short sides of the sand-filled tube bags (1-2) between the upper and lower layers are staggered and stacked, and the number of sand-filled tube bags (1-2) arranged in each layer is the same, ensuring that the slope of the water-facing slope formed after the sand-filled tube bags (1-2) are stacked is the same as the slope of the side slope (3) located below the high water level line; based on this standard, repeat steps (2) and (3) for each layer until the stacking reaches the high water level line; (5) pouring biocement reinforced sand (1-3) from bottom to top in the gaps between the water-facing slopes of the sand-filled tube bags (1-2), and compacting the water-facing slopes by a hydraulic vibration compactor; (6) On the top of the side slope (3) and the sand-filled tube bag (1-2), the water-facing slope of the sand-filled tube bag (1-2), and above the first geotextile (1-1) that is in close contact with the seabed (2), the second geotextile (1-4) is laid side by side in the direction of the connecting line between the side slope (3) and the seabed (2); and the overlap width between each two adjacent second geotextiles (1-4) arranged side by side is not less than 1m; the first geotextile (1-1) and the second geotextile (1-4) are fixed with steel pipes at the overlapping portion between the side slope and the seabed (2); (7) pouring sand (1-3-1) above the first geotextile (1-1) and the second geotextile (1-4) above the high water mark of the sand-filled tube bag (1-2), setting a sand cushion layer (1-5), and compacting the sand cushion layer (1-5) by a hydraulic vibration compactor; (8) The wave-breaking block (1-6) is arranged above the sand cushion layer (1-5) by means of a lifting device.

9. The construction method of the coastal anti-scour fill embankment slope protection structure according to claim 8, characterized in that: In the step (3), the biocement reinforced sand (1-3) is mixed with the sand (1-3-1) containing the biofiber (1-3-3) and the microorganism (1-3-2) that can induce mineralization by spraying. The steps are as follows: first, a suspension of the microorganism (1-3-2) that can induce mineralization is sprayed on the surface of the sand (1-3-1), and then a calcium chloride and urea solution is sprayed. The above steps are repeated for a second spraying to fully mix the microorganism (1-3-2) that can induce mineralization and the sand (1-3-1), thereby completing the preparation of the biocement reinforced sand (1-3).

10. The construction method of the coastal anti-scour fill embankment slope protection structure according to claim 8, characterized in that: In the steps (5) and (7), the biocement reinforced sand (1-3) and the sand cushion layer (1-5) should be filled during low tide to reduce the loss of sand (1-3-1) during the filling process due to water scouring.

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