Layout method of coast protection structure based on modular flexible geotechnical cloth bag armor

Abstract

The invention relates to a coast protection structure arrangement method based on a modular flexible geotechnical cloth bag armor. The method comprises the steps that S1, coast engineering area data are collected; s2, determining a dynamic damaged area and a corresponding erosion strength index; s3, identifying a typical damaged area; s4, determining a geotechnical multi-layer armor layout area; s5, determining the arrangement position of the geotechnical cloth bag armor; s6, a geotechnical cloth material is arranged; s7, the size of the geotechnical cloth bag armor unit is calculated, and a geotechnical cloth bag is manufactured; s8, obtaining a geotechnical cloth bag armor unit; s9, constructing a stainless steel frame of the industrial cloth bag armor unit; s10, a geotechnical cloth covering layer is fixed to the surface of the frame; s11, a standardized geotechnical cloth bag armor unit is constructed; s12, constructing a continuous flexible geotechnical cloth bag armored protective surface; and S13, anchoring the continuous flexible geotechnical cloth bag armored protective surface on the anchoring structure. Compared with the prior art, the device has the advantages that the defects that the protection range is redundant or insufficient, and the device cannot adapt to different wave impact forces due to the lack of modular design are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of coastal protection, and in particular to a coastal protection structure arrangement method based on modular flexible geotextile bag armor. Background Art

[0002] Traditional coastal protection projects mainly rely on rigid structures (such as concrete slope protection, riprap spurs, etc.). Although they can resist erosion in the short term, they have significant defects: serious ecological damage, high maintenance costs, and difficulty adapting to complex terrain changes. With the increasing demand for ecological protection, soft projects (such as sand dams, sandy headlands, etc.) have gradually been adopted. Although they are environmentally friendly, they face their own limitations - the main body of the sand dam is easily collapsed or displaced by strong waves, and frequent sand replenishment is required to maintain its shape, and the operation and maintenance costs are high. In order to make up for the lack of anti-scouring ability of soft projects, existing flexible protection technologies (such as geotextile soft rows) have been introduced. They partially improve terrain adaptability through flexible materials, but they still have fundamental defects: weak anti-wave erosion ability and lack of modular design, resulting in low efficiency of repair after local damage and difficulty in coping with continuous hydrological impacts. In summary, in the existing technical system, rigid structures, soft engineering and flexible protection all have single shortcomings in ecology, stability or economy. Traditional protection projects mostly rely on experience or single wave parameters to determine the layout area, which can easily lead to redundant or insufficient protection range. At the same time, the lack of modular design cannot adapt to different wave impact forces, and the protection effect of coastal protection structures is poor. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems of redundant or insufficient protection range and lack of modular design and inability to adapt to different wave impact forces.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A method for arranging a coastal protection structure based on modular flexible geotextile bag armor comprises the following steps:

[0006] S1. Collect coastal engineering area data, wherein the engineering area data includes input wave parameters and historical shoreline erosion data;

[0007] S2. Classify the erosion intensity into five levels based on historical shoreline erosion data, corresponding to the first erosion intensity index, and determine the dynamic damaged area based on the first erosion intensity index and wave parameters;

[0008] S3, taking the dynamically damaged area where the first erosion intensity index exceeds the first threshold as the typical damaged area, that is, the geobag armor deployment area;

[0009] S4. Determine the erosion intensity index of the project area under the return period standard based on the extreme wave conditions, and designate the dynamically damaged area where the erosion intensity index of the project area under the return period standard exceeds the second threshold as the area for deploying geotechnical multi-layer armor;

[0010] S5. Calculate the maximum crushing water depth and the minimum crushing water depth, and use the location between the maximum crushing water depth and the minimum crushing water depth in the deployment area as the deployment location of the geobag armor;

[0011] S6. Setting geotextile material;

[0012] S7. Calculate the size of the geotextile bag armor unit and make the geotextile bag;

[0013] S8. Filling the geotextile bag to obtain a geotextile bag armor unit;

[0014] S9, welding the geotextile bag armor unit and the stainless steel frame to obtain a geotextile bag armor unit stainless steel frame;

[0015] S10, fixing the geotextile covering layer on the surface of the frame;

[0016] S11, tie the S11 frame in full-pavement layout to form a standardized geotextile bag armor unit;

[0017] S12. Use steel wire ropes to connect adjacent standardized geotextile bag armor units in series to form a continuous flexible geotextile bag armor protection surface;

[0018] S13. Anchor the continuous flexible geotextile bag armor protection surface on the anchoring structure of the geotextile bag armor deployment location on the coast.

[0019] Furthermore, the first erosion intensity index is:

[0020]

[0021] Where EI is the first erosion intensity index, a, b, and c are the identified parameters, H represents the significant wave height, T represents the wave period, θ represents the wave incident angle, and D represents the median sediment particle size.

[0022] Furthermore, the erosion intensity index of the project area under the recurrence period standard is:

[0023]

[0024] Among them, EI T is the erosion intensity index of the project area under the recurrence period standard, H T is the return period wave height.

[0025] Furthermore, the return period wave height is:

[0026]

[0027] The parameters μ and σ are determined by fitting the Gumbel distribution, and T is the return period.

[0028] Furthermore, the geotextile bag armor unit size includes the length l, width w and height d of the geotextile bag armor unit, and the geotextile bag armor unit size satisfies:

[0029]

[0030] lw 2 d≥2γF max h c

[0031] Among them, ρ s represents the density of filled gravel, V represents the volume of geotextile bag, γ represents the anti-slip safety factor, F max Indicates the maximum impact force of the wave, h c is the height of the force application point.

[0032] Furthermore, the steps of S9 include:

[0033] Determine the stainless steel frame corresponding to the size of the geotextile bag armor unit, weld the stainless steel frame, and weld brackets at certain intervals inside the frame.

[0034] Furthermore, the step of S5 includes:

[0035] Get the maximum breaking wave height H max and minimum breaking wave height H min , substitute into the wave breaking water depth calculation formula, and get the maximum breaking water depth h max and minimum breaking water depth h min .

[0036] Furthermore, the calculation formula for wave breaking water depth is:

[0037]

[0038] Where L0 is the deep water wavelength and T is the wave period.

[0039] Furthermore, the maximum pull-out resistance of a single anchor of the anchoring structure satisfies:

[0040] F anchor =γF max S anchor

[0041] μW+F anchor ≥γF max

[0042] Among them, F anchorIndicates the maximum pull-out strength of a single anchor, γ safety factor, F max Indicates the maximum impact force, S anchor represents the anchor spacing, μ represents the substrate friction coefficient, and W represents the armor's own weight.

[0043] Furthermore, glass parameters include significant wave height, wave period and wave incident angle.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. Compared to traditional protection projects that often rely on experience or a single wave parameter (such as wave height) to determine deployment areas, resulting in redundant or insufficient protection coverage, this invention uses a dynamic damaged area identification algorithm that integrates wave parameters with historical shoreline erosion data to calculate the Erosion Intensity Index (EI), which divides low-, medium-, and high-risk areas to effectively determine the protection scope.

[0046] 2. Existing modular units mostly use fixed sizes and cannot adapt to different wave impact forces. This invention is based on the geotextile armor unit size algorithm and dynamically calculates the unit length, width and height based on the maximum wave impact force, ensuring anti-slip stability and balanced anti-overturning moment.

[0047] 3. Traditional methods place protective structures within fixed water depths (e.g., below mean low tide), ignoring the dynamic impact of wave breaking. This invention uses a breaking depth formula combined with measured maximum and minimum wave heights to accurately calculate the breaking zone and target the placement of geotextile bag armor units.

[0048] 4. Existing anchoring systems often use a uniform distribution design, which results in resource waste or local failure. This invention uses an anchoring arrangement algorithm that combines the pullout resistance of a single anchor with the impact force distribution to dynamically adjust the anchoring density.

[0049] 5. Traditional flexible protection (such as geotextile soft row) sacrifices structural stability in exchange for ecology. The composite unit structure (short fiber geotextile + stainless steel frame + dense gravel filling) ensures ecology and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of the geotextile bag armor unit structure of the present invention;

[0051] Figure 2 This is a schematic diagram of the arrangement of the armored surface of the geotextile bag of the present invention;

[0052] Among them, 1 geotextile bag filled with sand and gravel, 2 geotextile cover, 3 stainless steel frame, 4 stainless steel bracket, 5 stainless steel link rope, 6 geotextile bag armored surface, 7 eroded beach, 8 eroded waves, 9 sand dam, 10 anchoring structure. DETAILED DESCRIPTION

[0053] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0054] In the existing technical system, rigid structures, soft engineering and flexible protection all have single shortcomings in ecology, stability or economy. An innovative solution that integrates modular design, high impact resistance and eco-friendly characteristics is urgently needed to break through the traditional technical barriers and achieve the coordinated goals of long-term stability and ecological balance of coastal protection projects. Therefore, the present invention proposes a coastal protection structure layout method based on modular flexible geotextile bag armor, which includes the following steps:

[0055] S1 Project area data collection: Collect measured data of the project area coast, including input wave parameters (wave height, period, incident angle) and historical shoreline erosion data;

[0056] S2 determines the parameters of the dynamic damaged area identification algorithm: based on the historical erosion data of the shoreline, the erosion intensity level is divided into 5 levels, corresponding to the erosion intensity index 1-5. The dynamic damaged area identification algorithm is determined based on the erosion intensity index and wave parameters. Parameters a, b, and c are used in the model. H represents the significant wave height, T represents the wave period, θ represents the wave incident angle (relative to the shoreline normal), and D represents the median sediment particle size. EI < 1.0 is considered low-risk, 1.0 ≤ EI < 2.5 is considered medium-risk, and EI ≥ 2.5 is considered high-risk.

[0057] S3 determines the geotextile bag armor deployment area: Based on the dynamic damaged area identification algorithm, the wave parameters (wave height, period, incident angle) of the project area are input, and the Calculate the erosion intensity index EI, and take the area with an erosion intensity index EI ≥ 2.5 within the coastal protection area as the typical damaged area, that is, the area where the geobag armor is deployed;

[0058] S4 determines the multi-layer deployment area of ​​geotextile bag armor based on extreme wave conditions: statistics of the maximum wave height data over many years, and calculates the return period wave height H T , The parameters μ and σ are determined by fitting the Gumbel distribution, and T is the return period. T Substitute into the dynamic damaged area recognition algorithm Determine the erosion intensity index of the project area under the recurrence period standard, and use the erosion intensity index EI T Areas with an armor rating of ≥3.5 have enhanced protection and can be equipped with multiple layers of armor.

[0059] S5 Determine the underwater placement of geobag armor: The main function of geobag armor is to reduce wave erosion on the coast, and this erosion is mainly manifested by wave breaking and lifting sand. Therefore, placing geobag armor at the wave breaking position can better play the structural role. The wave breaking water depth is determined based on the breaking wave height. The wave breaking water depth is determined by the following formula:

[0060]

[0061] in: is the deep water wavelength, T is the wave period; H br is the breaking wave height; h is the breaking water depth. According to the actual wave measurement data in the project area, the maximum wave height H is determined. max and minimum wave height H min , calculate the maximum breaking water depth h based on the wave breaking water depth formula max and minimum breaking water depth h min Underwater h max and h min Geotextile bag armor is laid in between.

[0062] S6 Select geotextile material: Select geotextile with good water permeability and toughness (vertical permeability coefficient is between 1.0 and 9.9×10 -2 , breaking strength ≥6.1kN / m), considering the cost and material properties, short fiber needle punched nonwoven geotextile is selected;

[0063] S7 Geotextile Bag Making: Geotextile is made into geotextile bags according to specific length and width;

[0064] S8 Filling Geotextile Bags: Fill the prepared geotextile bags with sand and gravel, with a filling rate of ≥95%. The sand and gravel can be taken from local materials, reducing the transportation cost of sand and gravel (see Figure 1 );

[0065] S9 Algorithm for determining the size of geotextile bag armor units: Calculate the maximum impact force F of the wave max , maximum impact force F max Calculate according to the following formula: F max =0.5ρgH 2 max L unit α, the geotextile bag armor unit needs to meet the anti-slip condition and anti-overturning condition, that is, it needs to meet W = ρ s Vg=ρ s (lwd)g≥γF max and where ρ s h represents the density of filled gravel, V represents the volume of geotextile bag, l, w and d represent the length, width and height of geotextile bag armor unit, g represents the acceleration of gravity, and γ represents the anti-slip safety factor. cThe height of the force application point. The size of the geotextile bag armor unit must meet the following conditions and lw 2 d≥2γF max h c .

[0066] S10 welding geotextile armor unit stainless steel frame: Based on the geotextile armor unit size algorithm, determine the appropriate length and width of the stainless steel frame, weld the stainless steel frame according to the value, and weld a certain interval bracket inside the frame to fix the geotextile bag (see Figure 1 );

[0067] S11 Fixed geotextile cover: The frame surface is fully covered with short fiber geotextile, fixed with nylon rope to form a seamless anti-seepage protective layer (see Figure 1 );

[0068] S12 Preparation of standardized geotextile bag armor unit: Use nylon rope to tie the geotextile bag to the frame bracket in a full-spread layout to form a standardized geotextile bag armor unit (see Figure 1 );

[0069] S13 Preparation of geotextile bag armor protection surface: Use high-strength steel wire ropes (tensile strength ≥50kN) with a diameter of ≥9.3mm to connect adjacent geotextile bag armor units in series, with a node spacing of ≤0.1m to form a continuous flexible geotextile bag armor protection surface (see Figure 1 );

[0070] S14 determines the anchoring structure layout algorithm: The anchoring structure anchors the geotextile bag armor unit to the subgrade to prevent it from sliding or overturning due to wave impact. The single anchor pullout force is calculated by the safety factor and the wave impact force. The following conditions must be met: F anchor =γF max S anchor , where F anchor Indicates the maximum design pull-out strength of a single anchor, γ safety factor (usually 1.5 to 2.0), F max Indicates the maximum impact force, S anchor Represents the anchor spacing. The anti-slip equation is used to ensure the synergy between anchor and unit, which needs to meet the following conditions: μW+F anchor ≥γF max , μ represents the friction coefficient of the substrate.

[0071] S15 Fixed geotextile armored surface: Anchoring structure is implanted on the sand bar, headland or beach wave side to fix the armored network to the subgrade (see Figure 2 ), optimize the anchoring density according to the impact force distribution, make the broken zone denser and the flat zone wider. Figure 1In the middle, the geotextile bag filled with gravel 1, the geotextile cover 2, the stainless steel frame 3, the stainless steel bracket 4, the stainless steel link rope 5, Figure 2 Among them, geotextile bag armor protection 6, eroding beach 7, eroding wave 8, sand bar 9, anchoring structure 10.

[0072] The beneficial effects of the present invention are:

[0073] 1. Compared with traditional protection projects that often rely on experience or a single wave parameter (such as wave height) to determine the deployment area, resulting in redundant or insufficient protection coverage, this invention uses a dynamic damaged area identification algorithm, integrates wave parameters with historical shoreline erosion data, calculates the Erosion Intensity Index (EI), divides low-, medium-, and high-risk areas, and effectively determines the protection range.

[0074] 2. Existing modular units mostly use fixed sizes and cannot adapt to different wave impact forces. This invention is based on the geotextile armor unit size algorithm and dynamically calculates the unit length, width and height based on the maximum wave impact force, ensuring anti-slip stability and balanced anti-overturning moment.

[0075] 3. Traditional methods place protective structures within fixed water depths (e.g., below mean low tide), ignoring the dynamic impact of wave breaking. This invention uses a breaking depth formula combined with measured maximum and minimum wave heights to accurately calculate the breaking zone and target the placement of geotextile bag armor units.

[0076] 4. Existing anchoring systems often use a uniform distribution design, which results in resource waste or local failure. This invention is based on an anchoring arrangement algorithm that combines the pullout resistance of a single anchor with the impact force distribution to dynamically adjust the anchoring density.

[0077] 5. Traditional flexible protection (such as geotextile soft row) sacrifices structural stability in exchange for ecology. The composite unit structure (short fiber geotextile + stainless steel frame + dense gravel filling) ensures ecology and stability.

[0078] This invention provides a novel coastal protection structure: an eco-friendly coastal protection structure based on modular flexible geobag armor and its deployment method. This structure belongs to the field of coastal protection technology, and more particularly, relates to a method for enhancing the wave erosion resistance of sand dams, headlands, and seawalls and extending the life of the project through a modular geobag armor unit design. The structure comprises geobag armor units composed of short-filament geobags (filled with sediment with a density of ≥95%), a stainless steel welded armor frame, and a geobag cover. Adjacent geobag armor units are connected in series by high-strength steel wire ropes to form a flexible protection network, which is anchored to the subgrade using ground anchors. The method includes dynamically identifying coastal damaged areas and extreme damaged areas under a recurrence period standard using a dynamic damaged area identification algorithm, determining geobag armor deployment areas and geobag armor multi-layer deployment areas, calculating the crushing water depth, and deploying the geobag armor within the crushing zone. The geobag armor unit size is determined using a geobag armor unit sizing algorithm. The anchor structure layout algorithm determines the pullout resistance of a single anchor, and the anchor density is optimized based on the impact force distribution.

[0079] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A method for arranging a coastal protection structure based on modular flexible geotextile bag armor, characterized in that: The method comprises the following steps: S1. Collect coastal engineering area data, wherein the engineering area data includes input wave parameters and historical shoreline erosion data; S2. Classify the erosion intensity into five levels based on historical shoreline erosion data, corresponding to the first erosion intensity index, and determine the dynamic damaged area based on the first erosion intensity index and wave parameters; S3, taking the dynamically damaged area where the first erosion intensity index exceeds the first threshold as the typical damaged area, that is, the geobag armor deployment area; S4. Determine the erosion intensity index of the project area under the return period standard based on the extreme wave conditions, and designate the dynamically damaged area where the erosion intensity index of the project area under the return period standard exceeds the second threshold as the area for deploying geotechnical multi-layer armor; S5. Calculate the maximum crushing water depth and the minimum crushing water depth, and use the location between the maximum crushing water depth and the minimum crushing water depth in the deployment area as the deployment location of the geobag armor; S6. Setting geotextile material; S7. Calculate the size of the geotextile bag armor unit and make the geotextile bag; S8. Filling the geotextile bag to obtain a geotextile bag armor unit; S9, welding the geotextile bag armor unit and the stainless steel frame to obtain a geotextile bag armor unit stainless steel frame; S10, fixing the geotextile covering layer on the surface of the frame; S11, tie the S11 frame in full-pavement layout to form a standardized geotextile bag armor unit; S12. Use steel wire ropes to connect adjacent standardized geotextile bag armor units in series to form a continuous flexible geotextile bag armor protection surface; S13. Anchor the continuous flexible geotextile bag armor protection surface on the anchoring structure of the geotextile bag armor deployment location on the coast.

2. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 1 is characterized in that: The first erosion intensity index is: Where EI is the first erosion intensity index, a, b, and c are the identified parameters, H represents the significant wave height, T represents the wave period, θ represents the wave incident angle, and D represents the median sediment particle size.

3. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 2, characterized in that: The erosion intensity index of the project area under the recurrence period standard is: Among them, EI T is the erosion intensity index of the project area under the recurrence period standard, H T is the return period wave height.

4. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 3, characterized in that: The return period wave height is: The parameters μ and σ are determined by fitting the Gumbel distribution, and T is the return period.

5. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 1, characterized in that: The dimensions of the geobag armor unit include the length l, width w and height d of the geobag armor unit. The dimensions of the geobag armor unit meet the following requirements: lw 2 d≥2γF max h c Among them, ρ s represents the density of filled gravel, V represents the volume of geotextile bag, γ represents the anti-slip safety factor, F max Indicates the maximum impact force of the wave, h c is the height of the force application point.

6. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 1, characterized in that: The steps for S9 include: Determine the stainless steel frame corresponding to the size of the geotextile bag armor unit, weld the stainless steel frame, and weld brackets at certain intervals inside the frame.

7. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 1, characterized in that: The steps of S5 include: Get the maximum breaking wave height H max and minimum breaking wave height H min , substitute into the wave breaking water depth calculation formula, and get the maximum breaking water depth h max and minimum breaking water depth h min .

8. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 7, characterized in that: The calculation formula for wave breaking water depth is: Where L0 is the deep water wavelength and T is the wave period.

9. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 1, characterized in that: The maximum pull-out resistance of a single anchor in the anchoring structure meets the following requirements: F anchor =γF max S anchor μW+F anchor ≥γF max Among them, F anchor Indicates the maximum pull-out strength of a single anchor, γ safety factor, F max Indicates the maximum impact force, S anchor represents the anchor spacing, μ represents the substrate friction coefficient, and W represents the armor's own weight.

10. The method for arranging a coastal protection structure based on modular flexible geotextile bag armor according to claim 1, characterized in that: Glass parameters include significant wave height, wave period and wave incidence angle.

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