Design method, device and equipment of offshore structure pile foundation riprap protection structure

Abstract

The invention provides a design method, device and equipment for an offshore structure pile foundation riprap protection structure, and the method comprises the steps that the actual bed surface shear stress corresponding to an offshore structure pile foundation, the pile foundation diameter of the offshore structure pile foundation and the corresponding first scouring depth of the offshore structure pile foundation under the non-protection condition are obtained; determining the minimum allowable riprap median particle size of the riprap protection structure based on the first association relationship between the riprap particle size and the bed surface shear stress critical value and the actual bed surface shear stress; based on the first scouring depth and the pile foundation diameter, the structure size of the riprap protection structure is obtained; based on the pile foundation diameter, the riprap median particle size and a pre-established second incidence relation, the target protection layer number of the riprap protection structure is obtained; and designing a riprap protection structure based on the riprap median particle size, the target protection layer number and the structure size, and configuring an inverted filter layer for the riprap protection structure based on the target protection layer number. According to the scheme, a more scientific and effective riprap protection structure can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of offshore structure protection, and in particular to a design method, device and equipment for a pile foundation riprap protection structure of an offshore structure. Background Art

[0002] In the related art, the design of riprap protection mainly focuses on the selection of riprap particle size, lacks a design method for the size of the protection structure, and the design direction is relatively one-sided, resulting in poor actual application effect of the riprap design solution. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] In a first aspect, the present application proposes a design method for a riprap protective structure for an offshore structure pile foundation, the method comprising: obtaining an actual bed shear stress corresponding to the offshore structure pile foundation, a pile foundation diameter of the offshore structure pile foundation, and a first scouring depth corresponding to the offshore structure pile foundation without protection; determining a minimum allowable riprap median particle size of the riprap protective structure based on a first correlation relationship between the riprap particle size and a critical value of the bed shear stress and the actual bed shear stress; obtaining a structural dimension of the riprap protective structure based on the first scouring depth and the pile foundation diameter; obtaining a target number of protective layers of the riprap protective structure based on the pile foundation diameter, the riprap median particle size, and a pre-established second correlation relationship; wherein the second correlation relationship is a correlation relationship between the pile foundation diameter, the scouring depth, the riprap particle size, and the number of protective layers; designing the riprap protective structure based on the riprap median particle size, the target number of protective layers, and the structural dimension, and configuring an anti-filter layer for the riprap protective structure based on the target number of protective layers.

[0005] In one implementation, obtaining the actual bed shear stress corresponding to the pile foundation of the offshore structure includes: obtaining the environmental parameters corresponding to the pile foundation of the offshore structure; determining the water flow bed shear stress and / or the wave bed shear stress based on the environmental parameters; determining the wave-to-current ratio based on the environmental parameters; determining that the wave-to-current ratio is less than a preset threshold, and obtaining the actual bed shear stress based on the water flow bed shear stress, or determining that the wave-to-current ratio is greater than or equal to the preset threshold, and calculating and obtaining the actual bed shear stress based on the water flow bed shear stress and the wave bed shear stress.

[0006] In an optional implementation, the environmental parameter includes at least one of the following: water depth; water flow velocity; wave height; wave period; wavelength.

[0007] In one implementation, the target number of protective layers of the riprap protection structure is obtained based on the pile foundation diameter, the riprap median particle size, and a pre-established second association relationship, including: obtaining scour depth limit information; determining a scour depth limit range based on the scour depth limit information; and obtaining a feasible maximum number of protective layers as the target number of protective layers based on the scour depth limit range, the riprap median particle size, the pile foundation diameter, and the second association relationship.

[0008] In one implementation, the second association relationship may be expressed as follows:

[0009]

[0010] Among them, S d is the edge scour depth in the equilibrium state under riprap protection; D is the pile foundation diameter, D a is the median particle size of riprap; θ / θ cr,s is the relative Shields number, θ / θ cr,s =τ / τ cr,s , τ cr,s is the critical Shields number of bed sediment; w is the riprap protection width of the riprap protection structure; N is the number of protection layers of the riprap protection structure, and B is a preset calculation parameter.

[0011] In one implementation, configuring an anti-filter layer for the riprap protection structure based on the target number of protection layers includes: in response to the target number of protection layers being less than a preset layer threshold, determining not to configure the anti-filter layer; or, in response to the target number of protection layers being greater than or equal to the layer threshold, determining to configure the anti-filter layer.

[0012] In the second aspect, the present application proposes a design device for a riprap protective structure for an offshore structure pile foundation, the device comprising: an acquisition module for acquiring an actual bed shear stress corresponding to the offshore structure pile foundation, a pile foundation diameter of the offshore structure pile foundation, and a first scouring depth corresponding to the offshore structure pile foundation without protection; a first processing module for determining a minimum allowable median riprap particle size for the riprap protective structure based on a first correlation relationship between the riprap particle size and a critical value of the bed shear stress and the actual bed shear stress; a second processing module for determining a minimum allowable median riprap particle size for the riprap protective structure based on the first scouring depth and the first correlation relationship between the riprap particle size and a critical value of the bed shear stress and the actual bed shear stress; The method comprises the following steps: a first processing module, a second processing module, and a processing module for obtaining a target number of protective layers of the riprap protection structure based on the pile foundation diameter, the riprap median particle size, and a pre-established second association relationship; wherein the second association relationship is an association relationship between the pile foundation diameter, the scouring depth, the riprap particle size, and the number of protective layers; and a fourth processing module, a processing module for designing the riprap protection structure based on the riprap median particle size, the target number of protective layers, and the structural size, and configuring an anti-filter layer for the riprap protection structure based on the target number of protective layers.

[0013] In one implementation, the acquisition module can be used to: acquire the environmental parameters corresponding to the pile foundation of the offshore structure; determine the water flow bed shear stress and / or wave bed shear stress based on the environmental parameters; determine the wave-to-current ratio based on the environmental parameters; determine that the wave-to-current ratio is less than a preset threshold, and acquire the actual bed shear stress based on the water flow bed shear stress, or determine that the wave-to-current ratio is greater than or equal to the preset threshold, and calculate and acquire the actual bed shear stress based on the water flow bed shear stress and the wave bed shear stress.

[0014] In an optional implementation, the environmental parameter includes at least one of the following: water depth; water flow velocity; wave height; wave period; wavelength.

[0015] In one implementation, the third processing module can be used to: obtain scour depth limit information; determine the scour depth limit range based on the scour depth limit information; and obtain the maximum feasible number of protection layers as the target number of protection layers based on the scour depth limit range, the median particle size of the riprap, the pile foundation diameter and the second association relationship.

[0016] In one implementation, the second association relationship may be expressed as follows:

[0017]

[0018] Among them, S d is the edge scour depth in the equilibrium state under riprap protection; D is the pile foundation diameter, D a is the median particle size of riprap; θ / θ cr,sis the relative Shields number, θ / θ cr,s =τ / τ cr,s , τ cr,s is the critical Shields number of bed sediment; w is the riprap protection width of the riprap protection structure; N is the number of protection layers of the riprap protection structure, and B is a preset calculation parameter.

[0019] In one implementation, the fourth processing module can be used to: in response to the target number of protection layers being less than a preset layer threshold, determine not to configure the anti-filter layer; or, in response to the target number of protection layers being greater than or equal to the layer threshold, determine to configure the anti-filter layer.

[0020] In a third aspect, the present application proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the design method of the pile foundation riprap protection structure of the offshore structure as described in the first aspect.

[0021] In a fourth aspect, the present application proposes a computer-readable storage medium for storing instructions, which, when executed, enables the method described in the first aspect to be implemented.

[0022] In a fifth aspect, the present application proposes a computer program product, including a computer program, which, when executed by a processor, implements the steps of the method for designing a pile foundation riprap protective structure of an offshore structure as described in the first aspect.

[0023] The design method, device, equipment and storage medium of the riprap protection structure for offshore structure pile foundation provided by the present application can determine the minimum allowable riprap median particle size of the riprap protection structure according to the actual bed shear stress corresponding to the offshore structure pile foundation and the preset first correlation relationship, and obtain the structural size of the riprap protection structure according to the first scouring depth corresponding to the offshore structure pile foundation without protection, and obtain the target number of protection layers of the riprap protection structure based on the pile foundation diameter, the riprap median particle size and the pre-established second correlation relationship, and configure the riprap protection structure with an anti-filter layer based on the target number of protection layers, thereby completing the design of the riprap protection structure for offshore structure pile foundation. A more scientific and effective riprap protection structure can be obtained, thereby improving the protection effect of offshore structures.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is an example diagram of a riprap protection structure provided in an embodiment of the present application;

[0027] Figure 2 It is a flow chart of a design method of a pile foundation riprap protection structure of an offshore structure provided in an embodiment of the present application;

[0028] Figure 3 It is a flow chart of another design method of a pile foundation riprap protection structure of an offshore structure provided in an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of a riprap particle size design process provided in an embodiment of the present application;

[0030] Figure 5 It is a flow chart of another design method of a pile foundation riprap protection structure of an offshore structure provided in an embodiment of the present application;

[0031] Figure 6 is a comparison chart of the calculation results and the test results provided in the embodiments of the present application;

[0032] Figure 7 It is a design flow chart of a pile foundation riprap protection structure for an offshore structure provided in an embodiment of the present application;

[0033] Figure 8 It is a structural schematic diagram of a design device for a pile foundation riprap protection structure of an offshore structure provided in an embodiment of the present application;

[0034] Fig. 9 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0036] The following describes a design method and device for a pile foundation riprap protection structure for an offshore structure according to an embodiment of the present application with reference to the accompanying drawings.

[0037] See also Figure 1 , Figure 1 is an example diagram of a riprap protection structure provided in an embodiment of the present application. Figure 1As shown, the structural parameters of a typical protective structure may include the pile diameter D, the protective structure size w, the number of protective structure layers N, Figure 1 In the figure, N=3 is taken as an example. In the figure, α is the riprap slope angle, and its value range can be 1:1 to 1:2.

[0038] Figure 2 1 is a flow chart of a design method for a pile foundation riprap protection structure of an offshore structure provided in an embodiment of the present application. Figure 2 As shown, the method may include but is not limited to the following steps:

[0039] Step S201: obtaining the actual bed shear stress corresponding to the offshore structure pile foundation, the pile foundation diameter of the offshore structure pile foundation, and the first scour depth corresponding to the offshore structure pile foundation without protection.

[0040] Exemplarily, based on the hydrological information of the sea area where the offshore structure is located, the actual bed shear stress borne by the offshore structure is determined, the pile foundation diameter of the offshore structure pile foundation is obtained according to the design parameters, and the first scour depth around the offshore structure pile foundation in an unprotected condition is calculated according to existing specifications (for example, the Norwegian Classification Society specification: Support structure for wind turbines. DNV-ST-0126).

[0041] It should be noted that, in the embodiments of the present application, the offshore structure may be an offshore wind turbine.

[0042] Step S202: Determine the minimum allowable median riprap size of the riprap protection structure based on the first correlation between the riprap size and the critical value of the bed shear stress and the actual bed shear stress.

[0043] Exemplarily, the actual bed shear stress is used as the critical value of the bed shear stress, so that the riprap particle size corresponding to the actual bed shear stress is obtained according to the first association relationship as the minimum allowable riprap median particle size under actual conditions.

[0044] Step S203: Based on the first scouring depth and the pile foundation diameter, the structural dimensions of the riprap protection structure are obtained.

[0045] Exemplarily, the following formula is used to calculate and obtain the structural size of the riprap protection structure based on the first scouring depth and the pile foundation diameter.

[0046]

[0047] Where w is the structural size, D is the pile diameter, S e is the first scouring depth, It is the angle of repose of seabed sediment.

[0048] Step S204: based on the pile foundation diameter, the median particle size of the riprap, and the pre-established second association relationship, the target number of protective layers of the riprap protective structure is obtained.

[0049] Among them, the second correlation is the correlation between the pile foundation diameter, the scouring depth, the riprap particle size and the number of protective layers.

[0050] For example, the feasible target number of protective layers is determined based on the limitation of edge scour depth, pile diameter, and median particle size of riprap of the engineering information of the offshore structure pile foundation.

[0051] Step S205: designing a riprap protection structure based on the median particle size of the riprap, the target number of protection layers and the structure size, and configuring an anti-filter layer for the riprap protection structure based on the target number of protection layers.

[0052] For example, refer to Figure 1 The structure shown is designed based on the median particle size of the riprap, the target number of protection layers and the structure size, and based on the specific value of the target number of protection layers, it is determined whether an anti-filter layer needs to be configured for the riprap protection structure.

[0053] By implementing the embodiment of the present application, the minimum allowable median particle size of the riprap protection structure can be determined according to the actual bed shear stress corresponding to the pile foundation of the offshore structure and the preset first correlation relationship, and the structural size of the riprap protection structure can be obtained according to the first scouring depth corresponding to the pile foundation of the offshore structure without protection, and the target number of protection layers of the riprap protection structure can be obtained based on the pile foundation diameter, the median particle size of the riprap and the pre-established second correlation relationship, and the filter layer can be configured for the riprap protection structure based on the target number of protection layers, thereby completing the design of the riprap protection structure for the pile foundation of the offshore structure. A more scientific and effective riprap protection structure can be obtained, thereby improving the protection effect of the offshore structure.

[0054] In some embodiments, the actual bed shear stress can be obtained based on the environmental conditions of the sea area where the offshore structure is located. As an example, see Figure 3 , Figure 3 FIG. 1 is a flow chart of another design method for a pile foundation riprap protection structure of an offshore structure provided in an embodiment of the present application. Figure 3 As shown, the method may include but is not limited to the following steps:

[0055] Step S301: Obtain environmental parameters corresponding to the pile foundation of the offshore structure.

[0056] In the embodiment of the present application, the above environmental parameters include at least one of the following: water depth; water flow velocity; wave height; wave period; wavelength. Among them, the water flow velocity at least includes the water flow velocity at a distance of D / 2 from the bed surface, and D is the pile foundation diameter.

[0057] Step S302: Determine the flow bed shear stress and / or wave bed shear stress based on the environmental parameters.

[0058] Exemplarily, the following formula may be used to calculate and determine the water bed shear stress based on environmental parameters.

[0059]

[0060] Among them, τ c is the bed shear stress under the action of water flow, ρ w is the water density, is the vertical average velocity; κ is the Karman constant, which can be 0.4; z0 is the roughness height, which can be d 50 / 12,d 50 is the median particle size of bed sediment.

[0061] Exemplarily, the following formula may be used to calculate the wave flow bed shear stress based on environmental parameters.

[0062]

[0063] Among them, τ w is the maximum bed shear stress when the wave acts alone, ρ is the water density, U wm is the wave oscillation velocity, T is the wave period, and z0 is the roughness height. In some embodiments, z0=d 50 / 12.

[0064] Step S303: Determine the wave-to-current ratio based on environmental parameters.

[0065] Exemplarily, the wave-to-current ratio may be determined by calculating based on environmental parameters using the following formula.

[0066]

[0067] Among them, U cw is the wave-to-current ratio, U c is the water velocity at a distance of D / 2 from the bed surface, D is the pile diameter, k is the wave number, k=2π / L, L is the wavelength, and z is the vertical coordinate (i.e. z=0 is the seabed surface) from the seabed surface. In some embodiments, z can be D / 2.

[0068] Step S304: Determine that the wave-to-current ratio is less than a preset threshold, and obtain the actual bed shear stress based on the water flow bed shear stress; or, determine that the wave-to-current ratio is greater than or equal to the preset threshold, and obtain the actual bed shear stress based on the water flow bed shear stress and the wave bed shear stress.

[0069] For example, if U cw If it is less than or equal to the preset threshold, it is determined that the wave-to-current ratio is less than the preset threshold, and the actual bed shear stress can be obtained by the following formula.

[0070] τ=4τ c

[0071] Among them, τ is the actual bed shear stress, τ c is the shear stress of the bed surface under the action of water flow.

[0072] For example, if U cw If it is greater than the preset threshold, it is determined that the wave-to-current ratio is greater than the preset threshold, and the actual bed shear stress can be obtained by the following formula.

[0073] τ=83+3.569τ c +0.765τ w

[0074] Among them, τ is the actual bed shear stress, τ c is the bed shear stress under the action of water flow, τ w It is the maximum bed shear stress when the wave acts alone.

[0075] Step S305: obtaining the pile foundation diameter of the offshore structure pile foundation and the first scouring depth corresponding to the offshore structure pile foundation without protection.

[0076] In the embodiments of the present application, step S305 can be implemented in any of the ways in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0077] Step S306: Based on the first correlation between the riprap particle size and the critical value of the bed shear stress and the actual bed shear stress, determine the minimum allowable riprap median particle size of the riprap protection structure.

[0078] In the embodiments of the present application, step S306 can be implemented in any of the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0079] Step S307: Based on the first scouring depth and the pile foundation diameter, the structural dimensions of the riprap protection structure are obtained.

[0080] In the embodiments of the present application, step S307 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0081] Step S308: Based on the pile foundation diameter, the median particle size of the riprap, and the pre-established second association relationship, the target number of protective layers of the riprap protective structure is obtained.

[0082] In the embodiments of the present application, step S308 can be implemented in any of the ways in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0083] Step S309: designing a riprap protection structure based on the median particle size of the riprap, the target number of protection layers and the structure size, and configuring an anti-filter layer for the riprap protection structure based on the target number of protection layers.

[0084] In the embodiments of the present application, step S309 can be implemented in any of the ways in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0085] By implementing the embodiments of the present application, the water flow intensity can be determined according to the environmental parameters, and the water flow bed shear stress and / or the wave bed shear stress can be obtained, so that the actual bed shear stress that is more in line with the actual situation can be obtained according to the water flow intensity combined with the water flow bed shear stress and / or the wave bed shear stress. Therefore, the obtained riprap protection structure is more in line with the actual riprap protection structure, and the protection effect on offshore structures is improved.

[0086] As an example, see Figure 4 , Figure 4 Schematic diagram of a riprap particle size design process provided in the embodiment of the present application. Figure 4 As shown, the correlation between the riprap particle size and the critical bed shear stress of riprap can be determined according to the structural parameters; the water bed shear stress and wave bed shear stress corresponding to different riprap particle sizes can be determined according to the environmental parameters corresponding to the offshore structure, and the wave action intensity can be determined based on the environmental parameters; thus, the bed shear stress can be obtained according to the wave action intensity in combination with the bed shear stress and / or the wave bed shear stress; the median particle size of riprap can be obtained by iterative calculation based on the bed shear stress and the correlation between the riprap particle size and the critical bed shear stress of riprap.

[0087] In some embodiments, the target number of protective layers of the riprap protective structure can be obtained based on the relevant restrictions on the edge scouring depth and combined with the second association relationship. Figure 5 , Figure 5 1 is a flow chart of another design method of a pile foundation riprap protection structure for an offshore structure provided in an embodiment of the present application. Figure 5 As shown, the method may include but is not limited to the following steps:

[0088] Step S501: obtaining the actual bed shear stress corresponding to the offshore structure pile foundation, the pile foundation diameter of the offshore structure pile foundation, and the first scour depth corresponding to the offshore structure pile foundation without protection.

[0089] In the embodiments of the present application, step S501 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0090] Step S502: Determine the minimum allowable median riprap size of the riprap protection structure based on the first correlation between the riprap size and the critical value of the bed shear stress and the actual bed shear stress.

[0091] In the embodiments of the present application, step S502 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0092] Step S503: Based on the first scouring depth and the pile foundation diameter, the structural dimensions of the riprap protection structure are obtained.

[0093] In the embodiments of the present application, step S503 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0094] Step S504: Obtain flushing depth limit information.

[0095] Exemplarily, the limiting information of the edge scouring depth of the submarine cable suspension stability and foundation bearing stability at the project site is obtained.

[0096] Step S505: determining the flushing depth limit range based on the flushing depth limit information.

[0097] Step S506: Based on the scouring depth limit range, the median particle size of the riprap, the pile foundation diameter and the second association relationship, the maximum feasible number of protective layers is obtained as the target number of protective layers.

[0098] In some embodiments, the second association relationship may be expressed as follows:

[0099]

[0100]

[0101] Among them, S d is the edge scour depth in the equilibrium state under riprap protection; D is the pile foundation diameter, D a is the median particle size of riprap; θ / θ cr,s is the relative Shields number, θ / θ cr,s =τ / τ Cr,s , τ cr,s is the critical Shields number of bed sediment; w is the riprap protection width of the riprap protection structure; N is the number of protection layers of the riprap protection structure, and B is the preset calculation parameter.

[0102] In some embodiments, B=0.04.

[0103] See also Figure 6 , Figure 6 : is a comparison chart of the calculation results and the test results provided in the embodiment of the present application. Figure 6 As shown in the figure, the above formula can accurately predict the balance edge scour depth with an error of ±0.2S d / D. Table 1 is an example of a test condition table, where the pile diameter is 5 cm and the test water depth is 8 cm.

[0104] Table 1 Test conditions

[0105] Test <![CDATA[U c (m / s)]]> <![CDATA[D a (mm)]]> N w / D <![CDATA[θ / θ cr ,s]]> <![CDATA[S d (cm)]]> 1 0.20 7.4 3 3 0.56 0.9 2 0.25 7.4 3 3 0.87 2.5 3 0.30 7.4 3 3 1.25 3.6 4 0.30 7.4 4 3 1.25 2.4 5 0.30 7.4 5 3 1.25 3.2 6 0.20 7.4 3 4 0.56 0.6 7 0.25 7.4 3 4 0.87 1.9 8 0.30 7.4 3 4 1.25 2.2 9 0.20 7.4 3 5 0.56 0.6 10 0.25 7.4 3 5 0.87 1.2 11 0.30 7.4 3 5 1.25 1.8 12 0.20 5.2 3 3 0.56 1.1 13 0.25 5.2 3 3 0.87 1.8 14 0.30 5.2 3 3 1.25 2.5

[0106] Step S507: designing a riprap protection structure based on the median particle size of the riprap, the target number of protection layers and the structure size, and configuring an anti-filter layer for the riprap protection structure based on the target number of protection layers.

[0107] In the embodiments of the present application, step S507 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0108] By implementing the embodiment of the present application, the scour depth limit range can be determined according to the scour depth limit information, so as to obtain the feasible maximum number of protective layers as the target number of protective layers based on the scour depth limit range, the pile foundation diameter and the determined median particle size of the riprap, combined with the second association relationship. The number of protective structure layers that is more in line with the actual project can be obtained, thereby improving the protection effect of offshore structures.

[0109] In some embodiments, configuring an anti-filter layer for the riprap protection structure based on the target number of protection layers in the aforementioned embodiments may include: in response to the target number of protection layers being less than a preset layer threshold, determining not to configure an anti-filter layer; or, in response to the target number of protection layers being greater than or equal to the layer threshold, determining to configure an anti-filter layer.

[0110] In some embodiments, the above-mentioned layer number threshold may be 4.

[0111] Exemplarily, in response to the target number of protection layers being less than 4, no anti-filter layer is provided.

[0112] Exemplarily, in response to the target number of protection layers being greater than or equal to 4, an anti-filter layer is provided to prevent sediment from escaping.

[0113] For example, if the anti-filtration measure is adopted, the gradation relationship between the anti-filtration layer particle size and the sediment particle size is shown in Table 2:

[0114] Table 2 Example of particle size of filter layer

[0115] <![CDATA[D 15,a / D 85,f ]]> <![CDATA[D 50,a / D 50,f ]]> <![CDATA[D 15,a / D 15,f ]]> Thompson&Shutterr Criteria ≤4 ≤7 ≤7

[0116] Among them, the data with subscript a in Table 2 are the data corresponding to the riprap, and the data with subscript f are the data corresponding to the substitute filter layer.

[0117] See also Figure 7 , Figure 7 This is a design flow chart of a pile foundation riprap protection structure for an offshore structure provided in an embodiment of the present application. Figure 7 As shown in Figure 1, after determining the median particle size of the riprap, the scouring depth S around the unprotected pile foundation can be calculated based on relevant parameters and existing specifications (for example, the Norwegian Classification Society specification: Support structure for wind turbines. DNV-ST-0126) e , and calculate the minimum protection size of the riprap protection structure; further, combined with the restrictions on the edge scour depth of the project requirements such as the stability of the suspended submarine cable and the stability of the foundation bearing, calculate the maximum number of protection layers acceptable to the project; and determine whether to take anti-filtration measures based on the maximum number of protection layers.

[0118] See also Figure 8 , Figure 8 Schematic diagram of a design device for a pile foundation riprap protection structure of an offshore structure provided in an embodiment of the present application. Figure 8 As shown, the device 800 includes: an acquisition module 801, which is used to acquire the actual bed shear stress corresponding to the offshore structure pile foundation, the pile foundation diameter of the offshore structure pile foundation and the first scouring depth corresponding to the offshore structure pile foundation without protection; a first processing module 802, which is used to determine the minimum allowable riprap median particle size of the riprap protection structure based on the first correlation relationship between the riprap particle size and the critical value of the bed shear stress and the actual bed shear stress; a second processing module 803, which is used to acquire the structural size of the riprap protection structure based on the first scouring depth and the pile foundation diameter; a third processing module 804, which is used to acquire the target number of protective layers of the riprap protection structure based on the pile foundation diameter, the riprap median particle size and a pre-established second correlation relationship; wherein the second correlation relationship is the correlation relationship between the pile foundation diameter, the scouring depth, the riprap particle size and the number of protective layers; a fourth processing module 805, which is used to design the riprap protection structure based on the riprap median particle size, the target number of protective layers and the structural size, and configure an anti-filter layer for the riprap protection structure based on the target number of protective layers.

[0119] In one implementation, the acquisition module 801 can be used to: obtain environmental parameters corresponding to the pile foundation of the offshore structure; determine the water flow bed shear stress and / or wave bed shear stress based on the environmental parameters; determine the wave-to-current ratio based on the environmental parameters; determine that the wave-to-current ratio is less than a preset threshold, and obtain the actual bed shear stress based on the water flow bed shear stress, or determine that the wave-to-current ratio is greater than or equal to a preset threshold, and obtain the actual bed shear stress based on the water flow bed shear stress and the wave bed shear stress.

[0120] In an optional implementation, the environmental parameter includes at least one of the following: water depth; water flow velocity; wave height; wave period; wavelength.

[0121] In one implementation, the third processing module 804 can be used to: obtain scour depth limit information; determine the scour depth limit range based on the scour depth limit information; and obtain the maximum feasible number of protection layers as the target number of protection layers based on the scour depth limit range, the median particle size of the riprap, the pile foundation diameter and the second association.

[0122] In one implementation, the second association relationship may be expressed as follows:

[0123]

[0124] Among them, S d is the edge scour depth in the equilibrium state under riprap protection; D is the pile foundation diameter, D a is the median particle size of riprap; θ / θ cr,s is the relative Shields number, θ / θ cr,s =τ / τ cr,s , τ cr,s is the critical Shields number of bed sediment; w is the riprap protection width of the riprap protection structure; N is the number of protection layers of the riprap protection structure, and B is the preset calculation parameter.

[0125] In one implementation, the fourth processing module 805 can be used to: determine not to configure an anti-filter layer in response to the target number of protection layers being less than a preset layer threshold; or determine to configure an anti-filter layer in response to the target number of protection layers being greater than or equal to the layer threshold.

[0126] Through the device of the embodiment of the present application, the minimum allowable median particle size of the riprap protection structure can be determined according to the actual bed shear stress corresponding to the pile foundation of the offshore structure and the preset first correlation relationship, and the structural size of the riprap protection structure can be obtained according to the first scouring depth corresponding to the pile foundation of the offshore structure without protection, and the target number of protection layers of the riprap protection structure can be obtained based on the pile foundation diameter, the median particle size of the riprap and the pre-established second correlation relationship, and the anti-filter layer is configured for the riprap protection structure based on the target number of protection layers, thereby completing the design of the riprap protection structure for the pile foundation of the offshore structure. A more scientific and effective riprap protection structure can be obtained, thereby improving the protection effect of the offshore structure.

[0127] It should be noted that the above explanation of the embodiment of the design method of the offshore structure pile foundation riprap protective structure is also applicable to the design device of the offshore structure pile foundation riprap protective structure of this embodiment, which will not be repeated here.

[0128] In order to implement the above embodiment, the present application also proposes an electronic device. Fig. 9 , Fig. 9 Schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Fig. 9 As shown, the electronic device 900 includes: a processor 901, and a memory 902 communicatively connected to the processor 901; the memory 902 stores computer-executable instructions; the processor 901 executes the computer-executable instructions stored in the memory to implement the method provided in the aforementioned embodiment.

[0129] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0130] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0131] In the description of this application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0132] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0133] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0134] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0135] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0136] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0137] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0138] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0139] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A design method for a pile foundation riprap protection structure of an offshore structure, characterized in that: include: Obtaining an actual bed shear stress corresponding to an offshore structure pile foundation, a pile foundation diameter of the offshore structure pile foundation, and a first scour depth corresponding to the offshore structure pile foundation without protection; Determining a minimum allowable median riprap size for the riprap protection structure based on a first correlation between the riprap size and the critical value of the bed shear stress and the actual bed shear stress; Based on the first scouring depth and the pile foundation diameter, obtaining the structural dimensions of the riprap protection structure; Based on the pile foundation diameter, the riprap median particle size and a pre-established second correlation relationship, a target number of protective layers of the riprap protective structure is obtained; wherein the second correlation relationship is a correlation relationship between the pile foundation diameter, the scouring depth, the riprap particle size and the number of protective layers; The riprap protection structure is designed based on the median particle size of the riprap, the target number of protection layers and the structure size, and an anti-filter layer is configured for the riprap protection structure based on the target number of protection layers.

2. The method according to claim 1, characterized in that The obtaining of the actual bed shear stress corresponding to the pile foundation of the offshore structure includes: Obtaining environmental parameters corresponding to the pile foundation of the offshore structure; Based on the environmental parameters, determining the water flow bed shear stress and / or the wave bed shear stress; determining a wave-to-current ratio based on the environmental parameters; Determine that the wave-to-current ratio is less than a preset threshold value, and obtain the actual bed shear stress based on the water flow bed shear stress; or, determine that the wave-to-current ratio is greater than or equal to the preset threshold value, and obtain the actual bed shear stress based on the water flow bed shear stress and the wave bed shear stress.

3. The method according to claim 2, characterized in that The environmental parameters include at least one of the following: water depth; Water flow rate; wave height; Wave period; wavelength.

4. The method according to claim 1, characterized in that The step of obtaining the target number of protective layers of the riprap protective structure based on the pile foundation diameter, the riprap median particle size and a pre-established second association relationship includes: Obtain scour depth limit information; Determining a scour depth limit range based on the scour depth limit information; Based on the scouring depth limit range, the median particle size of the riprap, the pile foundation diameter and the second association relationship, a feasible maximum number of protective layers is obtained as the target number of protective layers.

5. The method according to claim 1 or 4, characterized in that The second association relationship can be expressed as follows: Among them, S d is the edge scour depth in the equilibrium state under riprap protection; D is the pile foundation diameter, D a is the median particle size of riprap; θ / θ cr,s is the relative Shields number, θ / θ cr,s =τ / τ cr,s , τ cr,s is the critical Shields number of bed sediment; w is the riprap protection width of the riprap protection structure; N is the number of protection layers of the riprap protection structure, and B is a preset calculation parameter.

6. The method according to claim 1, characterized in that The configuring an anti-filter layer for the riprap protection structure based on the target number of protection layers includes: In response to the target number of protection layers being less than a preset layer number threshold, determining not to configure the anti-filter layer; or, In response to the target number of protection layers being greater than or equal to the layer number threshold, determining to configure the anti-filter layer.

7. A design device for a pile foundation riprap protection structure of an offshore structure, characterized in that: include: An acquisition module, used to acquire an actual bed shear stress corresponding to an offshore structure pile foundation, a pile foundation diameter of the offshore structure pile foundation, and a first scour depth corresponding to the offshore structure pile foundation without protection; A first processing module is used to determine the minimum allowable riprap median particle size of the riprap protection structure based on a first correlation relationship between the riprap particle size and the critical value of the bed shear stress and the actual bed shear stress; A second processing module, configured to obtain a structural dimension of the riprap protection structure based on the first scouring depth and the pile foundation diameter; A third processing module is used to obtain the target number of protective layers of the riprap protective structure based on the pile foundation diameter, the riprap median particle size and a pre-established second association relationship; wherein the second association relationship is an association relationship between the pile foundation diameter, the scouring depth, the riprap particle size and the number of protective layers; The fourth processing module is used to design the riprap protection structure based on the median particle size of the riprap, the target number of protection layers and the structure size, and configure an anti-filter layer for the riprap protection structure based on the target number of protection layers.

8. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method according to any one of claims 1 to 6.

10. A computer program product, characterized in that The method comprises a computer program, which implements the method according to any one of claims 1 to 6 when executed by a processor.

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