Calculation Method for Equivalent Bearing Capacity of the Area of the Five-Connected Tube Foundation for Offshore Wind Power

Abstract

This application relates to the field of offshore wind power engineering and discloses a calculation method for the equivalent bearing capacity of the area of a five-connected barrel foundation for offshore wind power, including the following steps: S1. Construct a finite element model including a five-connected barrel foundation, an equal-area single-barrel foundation, and a soil model; S2. Use finite element software for numerical simulation to calculate the one-way ultimate bearing capacity coefficients of the five-connected barrel foundation and the equal-area single-barrel foundation, including the vertical ultimate bearing capacity coefficient, the anti-sliding ultimate bearing capacity coefficient, and the anti-overturning ultimate bearing capacity coefficient; S3. Establish a bearing capacity conversion coefficient, defined as the ratio of the one-way ultimate bearing capacity coefficient of the five-connected barrel foundation to the one-way ultimate bearing capacity coefficient of the equal-area single-barrel foundation; S4. Apply the above conversion coefficient and the bearing capacity coefficient of the equal-area single-barrel foundation to calculate the bearing capacity of the five-connected barrel foundation. The present invention can calculate the vertical, anti-sliding, and anti-overturning bearing capacities of the five-connected barrel foundation based on the one-way bearing capacity of the single-barrel foundation, providing a reference for the design of the five-connected barrel foundation in engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power engineering, and specifically to a calculation method for the equivalent bearing capacity of the area of a five-connected barrel foundation for offshore wind power. Background Technique

[0002] As a common foundation form, the barrel foundation is widely used in fields such as offshore wind power engineering. The existing calculation methods for the ultimate bearing capacity of the barrel foundation mainly focus on the single-barrel foundation. However, with the continuous development of the demand for large-capacity wind power, the wind power team of Tianjin University has developed a new type of five-connected barrel foundation. The five-connected barrel foundation is composed of four independent single-barrel foundations connected by an arc transition section, and there is an intermediate barrel in the center connected to the four single-barrels, forming an integral five-connected barrel structure. Compared with the single-barrel foundation, the five-connected barrel foundation has gradually attracted the attention of the engineering community due to its superior floating stability, higher bearing capacity, and superior anti-buckling performance of the barrel wall.

[0003] However, the calculation methods for the vertical, anti-sliding, and anti-overturning bearing capacities of the five-connected barrel foundation have not been clarified, which limits the wide application of the five-connected barrel foundation in practical engineering. The existing bearing capacity specifications and theoretical calculation methods for single-barrel foundations cannot be directly applied to the five-connected barrel foundation. The mechanical behavior of the single-barrel foundation is relatively simple, while the mechanical behavior of the five-connected barrel foundation is more complex due to its complex structural form, especially in terms of vertical bearing capacity, anti-sliding, and anti-overturning, there are problems such as interaction between barrels and complex stress distribution. Therefore, the existing calculation methods for single-barrel foundations cannot meet the design requirements of the five-connected barrel foundation.

[0004] In view of this problem, the significance of the present invention is to propose a scientific finite element calculation method for the vertical, anti-sliding, and anti-overturning bearing capacities of the five-connected barrel foundation by establishing a quantitative relationship between the five-connected barrel foundation and the area-equivalent single-barrel foundation. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a calculation method for the equivalent bearing capacity of the area of a five-connected barrel foundation for offshore wind power, which solves the problem of calculating the unidirectional bearing capacity of the five-connected barrel foundation for offshore wind power, can more effectively calculate the vertical, anti-sliding, and anti-overturning bearing capacities of the barrel foundation, and provides a reference for the design of the five-connected barrel foundation in engineering.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A calculation method for the equivalent bearing capacity of the area of a five-connected barrel foundation for offshore wind power, including the following steps:

[0007] Construct a finite element model including a five-connected barrel foundation, an equal-area single-barrel foundation, and a soil body model;

[0008] Use finite element software for numerical simulation to calculate the unidirectional ultimate bearing capacity coefficients of the five-connected barrel foundation and the equal-area single-barrel foundation, including the vertical ultimate bearing capacity coefficient Ncv , the anti-slip ultimate bearing capacity coefficient N cHmax and the anti-tipping ultimate bearing capacity coefficient N cM ;

[0009] Establish a bearing capacity conversion coefficient X, defined as the ratio of the one-way ultimate bearing capacity coefficient of the five-connected cylinder foundation to the one-way ultimate bearing capacity coefficient of the equal-area single-cylinder foundation;

[0010] Apply the above conversion coefficient X and the bearing capacity coefficients of the equal-area single-cylinder foundation to calculate the bearing capacity of the five-connected cylinder foundation according to the following formula:

[0011] Vertical bearing capacity V ult = As u N cv (equivalent single cylinder) × X v ;

[0012] Anti-slip bearing capacity H maxult = As u N cHmax (equivalent single cylinder) × X Hmax ;

[0013] Anti-tipping bearing capacity M ult = ADs u N cM (equivalent single cylinder) × X M

[0014] Among them, A is the top cover area of the foundation, s u is the undrained shear strength of the soil mass, D is the diameter of the area-equivalent single-cylinder foundation, N cv (equivalent single cylinder), N cHmax (equivalent single cylinder) and N cM (equivalent single cylinder) are respectively the vertical ultimate bearing capacity coefficient, anti-slip ultimate bearing capacity coefficient and anti-tipping ultimate bearing capacity coefficient of the equivalent single-cylinder foundation, obtained by numerical simulation, X v , X Hmax and X M are respectively the conversion coefficients of vertical, anti-slip and anti-tipping bearing capacities, respectively defined as the ratio of the bearing capacity coefficients of the five-connected cylinder foundation and the equivalent single-cylinder foundation in the corresponding bearing capacity directions.

[0015] Preferably, the finite element model includes the geometric dimensions, material properties of the cylinder foundation and the contact interface with the soil mass.

[0016] Preferably, in the finite element model of the five-connected cylinder foundation, the lateral boundary of the model is not less than 5 times the horizontal dimension of the foundation from the center of the cylinder foundation, and the bottom foundation boundary of the model is not less than 4 times the vertical dimension of the foundation from the end of the foundation.

[0017] Preferably, when performing the numerical simulation, the lateral boundary of the model is not less than five times the horizontal dimension of the foundation from the center of the cylindrical foundation, and the foundation boundary at the bottom of the model is not less than four times the vertical dimension of the foundation from the end of the foundation, and not less than three times the horizontal dimension of the foundation.

[0018] Preferably, the calculation formula for the bearing capacity conversion coefficient X is:

[0019] Vertical bearing capacity conversion coefficient X v :

[0020]

[0021] Anti-sliding bearing capacity conversion coefficient X Hmax :

[0022]

[0023] Anti-overturning bearing capacity conversion coefficient X M :

[0024]

[0025] Wherein, L is the length of the cylinder skirt, D m is the diameter of the middle cylinder, D s is the diameter of the side cylinder.

[0026] Preferably, the vertical ultimate bearing capacity coefficient N cv , anti-sliding ultimate bearing capacity coefficient N cHmax and anti-overturning ultimate bearing capacity coefficient N cM increase with the increase of the length-diameter ratio L / D and satisfy the following relationship:

[0027] Vertical ultimate bearing capacity coefficient N cv :

[0028]

[0029] Anti-sliding ultimate bearing capacity coefficient N cHmax :

[0030]

[0031]

[0032] Anti-overturning ultimate bearing capacity coefficient N cM :

[0033]

[0034] Wherein, L is the length of the cylinder skirt, and D is the diameter of the single cylinder foundation with equivalent area.

[0035] Preferably, the vertical ultimate bearing capacity coefficient Ncv 、Coefficient N of ultimate anti-sliding bearing capacity cHmax and coefficient N of ultimate anti-overturning bearing capacity cM decrease with the increase of the ratio of long diameter to short diameter D m / D s and satisfy the following relationship:

[0036] Coefficient N of ultimate vertical bearing capacity cv :

[0037]

[0038] Coefficient N of ultimate anti-sliding bearing capacity cHmax :

[0039]

[0040] Coefficient N of ultimate anti-overturning bearing capacity cM :

[0041]

[0042] Among them, D m is the diameter of the middle cylinder, and D s is the diameter of the side cylinder.

[0043] The present invention also provides a calculation device for the equivalent bearing capacity of the area of the five-connected cylinder foundation for offshore wind power, including:

[0044] An input module for receiving data related to the five-connected cylinder foundation, the equal-area single-cylinder foundation and the soil body model, including but not limited to the geometric dimensions of the foundation, material properties and the constitutive model parameters of the soil body;

[0045] A finite element modeling module for constructing a finite element model including the five-connected cylinder foundation, the equal-area single-cylinder foundation and the soil body according to the data provided by the input module;

[0046] A numerical simulation module for numerically simulating the constructed model using finite element software to calculate the one-way ultimate bearing capacity coefficients of the five-connected cylinder foundation and the equal-area single-cylinder foundation, including the coefficient N of ultimate vertical bearing capacity cv , the coefficient N of ultimate anti-sliding bearing capacity cHmax and the coefficient N of ultimate anti-overturning bearing capacity cM ;

[0047] A bearing capacity conversion coefficient calculation module for establishing a bearing capacity conversion coefficient Z according to the bearing capacity coefficients obtained by the numerical simulation module;

[0048] A bearing capacity calculation module for calculating the vertical, anti-sliding and anti-overturning bearing capacities of the five-connected cylinder foundation by applying the bearing capacity conversion coefficient and the bearing capacity coefficients of the equal-area single-cylinder foundation;

[0049] An output module that outputs the calculation results, including the vertical, anti-sliding, and anti-overturning bearing capacity values of the five-tube foundation.

[0050] The present invention also provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method as described above is implemented.

[0051] The present invention also provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method as described above is implemented.

[0052] The present invention provides a method for calculating the equivalent bearing capacity of the area of the five-tube foundation for offshore wind power. It has the following

[0053] Beneficial effects:

[0054] 1. By establishing a quantitative relationship between the five-tube foundation and the area-equivalent single-tube foundation, and considering the influence of the sizes of the middle tube and the edge tubes on the bearing capacity, the present invention can provide more accurate calculation results for the vertical, anti-sliding, and anti-overturning bearing capacities. This advantage solves the problem that the existing code theoretical algorithms cannot be directly applied to the five-tube foundation, and improves the reliability and safety of design and construction.

[0055] 2. The method of the present invention is not only applicable to the five-tube foundation, but also can be made applicable to other multi-tube foundation forms by introducing correction factors. This wide applicability provides a scientific basis and technical support for the design of various complex foundation structures, and enhances the flexibility and practicality of engineering design.

[0056] 3. By accurately calculating the ultimate bearing capacity of the five-tube foundation, the present invention helps to optimize the foundation design, reduce material waste, and lower the project cost. In addition, improving the accuracy and safety of the foundation design also helps to extend the service life of the engineering structure, improve the overall engineering quality, and bring significant economic and social benefits. Description of the Drawings

[0057] Figure 1 It is one of the schematic flowcharts of the method of the present invention;

[0058] Figure 2 It is the finite element model of the five-tube and the diagonal loading method;

[0059] Figure 3 It is the opposite-side loading method of the five-tube;

[0060] Figure 4 It is the vertical ultimate bearing capacity coefficient N of the tubular foundation Cv Relationship diagram with the length-diameter ratio L / D;

[0061] Figure 5Coefficient N for the anti-sliding bearing capacity of the cylindrical foundation cHmax Relationship diagram with the length-diameter ratio L / D;

[0062] Figure 6 Coefficient N for the anti-overturning bearing capacity of the cylindrical foundation cM Relationship diagram with the length-diameter ratio L / D;

[0063] Figure 7 Coefficient N for the vertical ultimate bearing capacity of the cylindrical foundation cv With the middle-edge cylinder diameter ratio D m / D s Relationship diagram;

[0064] Figure 8 Coefficient N for the vertical ultimate bearing capacity of the cylindrical foundation cHmax With the middle-edge cylinder diameter ratio D m / D s Relationship diagram;

[0065] Figure 9 Coefficient N for the vertical ultimate bearing capacity of the cylindrical foundation cM With the middle-edge cylinder diameter ratio D m / D s Relationship diagram;

[0066] Figure 10 Schematic diagram of the device structure of the present invention;

[0067] Figure 11 Schematic diagram of the computer device structure of the present invention.

[0068] Among them, 100, input module; 200, finite element modeling module; 300, numerical simulation module; 400, bearing capacity conversion coefficient calculation module; 500, bearing capacity calculation module; 600, output module; 40, computer device; 41, processor; 42, memory; 43, storage medium. Specific implementation manners

[0069] Next, in combination with the attached drawings of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] Please refer to the attached Figure 1 - attached Figure 9 , the embodiments of the present invention provide a calculation method for the equivalent bearing capacity of the area of the five-connected cylinder foundation of offshore wind power, which can more effectively calculate the vertical, anti-sliding, and anti-overturning bearing capacities of the cylindrical foundation and provide a reference for the design of the five-connected cylinder foundation in engineering.

[0071] Specifically, the method of the present invention includes the following steps:

[0072] Step S1. Model establishment

[0073] According to the analysis working condition, a corresponding finite element model is established, and the model includes: a five-connected cylinder foundation model, an equal-area single-cylinder foundation model, and a soil body model, and their respective structural dimensions and connection methods are clarified.

[0074] The five-connected cylinder foundation model, the equal-area single-cylinder foundation model, and the soil body model adopt solid elements. The lateral boundary of the model should not be less than 5 times the horizontal dimension of the cylinder foundation from the center of the cylinder foundation, and the bottom foundation boundary of the model should not be less than 4 times the vertical dimension of the foundation from the end of the foundation, and should not be less than 3 times the horizontal dimension of the foundation.

[0075] The soil constitutive model can adopt an ideal elastic-plastic constitutive model based on the Mohr-Coulomb yield criterion or the Tresca yield criterion, or other soil constitutive models such as the modified Cambridge model (MCC model) or the Duncan-Chang model (Duncan-Chang model).

[0076] Step S2. Numerical simulation

[0077] Use the finite element method to numerically simulate the mechanical properties of the five-connected cylinder foundation and the single-cylinder foundation under unidirectional loads. For numerical simulation, finite element software such as ANSYS, ABAQUS, etc. is selected.

[0078] A contact interface is set between the foundation and the soil body to simulate and analyze the interaction between the cylinder and the soil.

[0079] The horizontal dimension of the grid in the area where the central cylinder foundation of the model is located and its surrounding area should not be greater than 1 / 40 of the horizontal dimension of the cylinder foundation, and the vertical dimension of the grid in the area where the cylinder foundation is located and its surrounding area should not be greater than 1 / 40 of the horizontal dimension of the cylinder foundation, and should not be greater than 1 / 40 of the vertical dimension of the cylinder foundation.

[0080] Adopt a static analysis step, which has high calculation efficiency, short time consumption, and reliable calculated bearing capacity values.

[0081] Step S3. Model test

[0082] Manufacture of the test model: Manufacture physical models of the five-connected cylinder foundation and the single-cylinder foundation, and scale the actual size according to a ratio.

[0083] Test platform: Select a suitable test platform to conduct a unidirectional load test on the model.

[0084] Step S4. Finite element verification

[0085] Compare the finite element simulation results with the ultimate bearing capacities of the five-connected cylinder foundation and the single-cylinder foundation under unidirectional loads to verify the accuracy of the model.

[0086] Step S5. Establishment of bearing capacity formula

[0087] Consider the influence of the length-diameter ratio L / D and the diameter ratio D of the middle cylinder to the side cylinder m / D s on the unidirectional bearing capacity.

[0088] Introduce the bearing capacity conversion coefficient X to establish the relationship between the bearing capacity of the five-connected cylinder and the vertical, anti-sliding, and anti-tipping bearing capacities of the area single cylinder.

[0089] The bearing capacity is the product A of the top cover area and the undrained shear strength of the soil mass su Normalization can obtain the bearing capacity coefficient:

[0090]

[0091] In the formula: V ult is the vertical ultimate bearing capacity of the tubular foundation; H maxult is the anti-sliding ultimate bearing capacity of the tubular foundation; M ukt is the anti-tipping ultimate bearing capacity of the tubular foundation; N cv is the vertical ultimate bearing capacity coefficient of the tubular foundation; N cGmax is the anti-sliding ultimate bearing capacity coefficient of the tubular foundation; M ult is the anti-tipping ultimate bearing capacity coefficient of the tubular foundation; A is the top cover area of the tubular foundation; s u is the undrained shear strength of the soil mass; D is the diameter of the area equivalent single cylinder.

[0092] The vertical ultimate bearing capacity coefficient N of the tubular foundation cv increases with the increase of L / D, and the trend is as Figure 4 shown, which can be expressed by the quadratic function formulas (2) and (3):

[0093]

[0094] In the formula: L is the length of the cylinder skirt.

[0095] The anti-sliding ultimate bearing capacity coefficient N of the tubular foundation cHmax increases with the increase of L / D, and the trend is as Figure 5 shown, which can be expressed by the quadratic function formulas (4)-(6):

[0096]

[0097] In the formula: N cHmax is the anti-sliding ultimate bearing capacity coefficient of the tubular foundation.

[0098] The anti-sliding ultimate bearing capacity coefficient N of the tubular foundation cM increases with the increase of L / D, and the trend is as Figure 6As shown, it can be expressed by the quadratic function formulas (7)-(9):

[0099]

[0100] Where: N cM is the anti-overturning ultimate bearing capacity coefficient of the cylindrical foundation.

[0101] To deeply analyze the influence law of the diameter ratio of the middle cylinder to the side cylinder on the equivalent calculation of the unidirectional bearing capacity of the five-connected cylinder foundation, the anti-sliding ultimate bearing capacity coefficient N cv of the five-connected cylinder and single-cylinder foundations decreases with the increase of D m / D s . The trend is as shown in Figure 7 and can be expressed by the quadratic function formulas (10) and (11):

[0102]

[0103] Where: D m is the diameter of the middle cylinder; D m is the diameter of the side cylinder.

[0104] The anti-sliding ultimate bearing capacity coefficient N cHmax of the five-connected cylinder and equivalent single-cylinder foundations decreases with the increase of D m / D s . The trend is as shown in Figure 8 and can be expressed by the quadratic function formulas (12)-(14):

[0105]

[0106]

[0107] The anti-overturning ultimate bearing capacity coefficient N cM of the five-connected cylinder and equivalent single-cylinder foundations all show a downward trend with the increase of D m / D s . The trend is as shown in Figure 9 and can be expressed by the quadratic function formulas (15)-(17):

[0108]

[0109] Formulas (2)-(17) are the calculation formulas for the unidirectional bearing capacity coefficients of the five-connected cylinder and equivalent single-cylinder foundations. The unidirectional bearing capacity coefficients of the foundation can be calculated respectively from the length-diameter ratio L / D and the diameter ratio of the middle cylinder to the side cylinder D m / D s , and then the unidirectional bearing capacity of the foundation can be obtained.

[0110] To obtain the quantitative conversion relationship between the ultimate bearing capacity of the five-connected cylinder and that of the equivalent single cylinder foundation, a bearing capacity conversion coefficient X is introduced, where X = the ultimate bearing capacity of the five-connected cylinder / the ultimate bearing capacity of the area-equivalent single cylinder. Among them:

[0111]

[0112] As can be seen from Equation (18), when the conversion coefficient X and the ultimate bearing capacity or the ultimate bearing capacity coefficient of the equivalent single cylinder foundation are known, the ultimate bearing capacity of the five-connected cylinder foundation can be calculated from Equation (18).

[0113] From Equations (2)-(17), the conversion coefficient X between the ultimate bearing capacity of the five-connected cylinder and that of the equivalent single cylinder foundation can be obtained.

[0114] Vertical bearing capacity conversion coefficient:

[0115]

[0116] Anti-sliding bearing capacity conversion coefficient:

[0117]

[0118] Anti-overturning bearing capacity conversion coefficient:

[0119]

[0120] Using the code theory algorithm or the finite element algorithm to obtain the vertical, anti-sliding, and anti-overturning bearing capacities of the equivalent single cylinder, based on Equation (17) and the single-way bearing capacity conversion coefficients Equations (18)-(20), the vertical, anti-sliding (opposite-side loading and diagonal loading), and anti-overturning (opposite-side loading and diagonal loading) bearing capacities of the five-connected cylinder can be obtained. Taking the finite element algorithm as an example, from Equations (1), (3), (18), and (19), the vertical bearing capacity Equation (22) of the five-connected cylinder can be calculated:

[0121]

[0122] From Equations (1), (6), (18), and (20), the opposite-side loading anti-sliding bearing capacity Equation (23) and the diagonal loading anti-sliding bearing capacity coefficient Equation (24) of the five-connected cylinder can be calculated:

[0123]

[0124] From Equations (1), (9), (18), and (21), the opposite-side loading anti-overturning bearing capacity Equation (25) and the diagonal loading anti-overturning bearing capacity coefficient Equation (26) of the five-connected cylinder can be calculated:

[0125]

[0126]

[0127] In the case of the known length L of the straight tube skirt, the area-equivalent single-tube diameter D, and the diameters D of the middle tube and the side tubes in the five-tube structure m and the side tube D s the vertical, anti-sliding (for side loading and diagonal loading), and anti-tipping (for side loading and diagonal loading) bearing capacities of the five-tube foundation can be calculated using Equations (22) - (26).

[0128] Example:

[0129] For an offshore wind power project with a single-unit capacity of 10 MW, a five-tube foundation is adopted, and the soil and foundation parameters are shown in Tables 1 and 2.

[0130] Table 1: Soil parameters

[0131]

[0132] Table 2: Dimensions of the model tubes

[0133]

[0134] The calculation method for the area-equivalent bearing capacity of the offshore wind power five-tube foundation in this example is carried out according to the following steps:

[0135] (1) Determine the calculation parameters: Based on the area of the five-tube top cover, it is equivalent to a single-tube foundation in terms of area. Since the diameter D of the middle tube in the five-tube structure of this case m = 28.8 m, the diameter D of the side tube s = 16 m, and the top cover area A = 1288 m 2 , according to the area equivalence of the top cover, it can be equivalent to a single-tube foundation with a diameter D = 40.5 m, that is, L / D = 10 / 40.5 = 0.247, Dm / Ds = 28.8 / 16 = 1.8.

[0136] (2) Calculate the bearing capacity coefficients: Calculate the vertical bearing capacity coefficient N of the equivalent single tube from Equation (3) cv (equivalent single tube) = -3.962×0.247 2 +10.481×0.247+6.219 = 8.566;

[0137] Calculate the anti-sliding bearing capacity coefficient N of the equivalent single tube from Equation (6) cHmax (equivalent single tube) = 3.058×0.247 2 +8.399×0.247+1.129 = 3.390;

[0138] Calculate the anti-sliding bearing capacity coefficient N of the equivalent single tube from Equation (9) cM (equivalent single tube) = 1.682×0.2472 +0.862 × 0.247 + 0.819 = 1.135;

[0139] (3) Calculate the conversion coefficient:

[0140] The vertical bearing capacity conversion coefficient X is calculated from Equation (19) v = 1.208 × (10 ÷ 40.5) 0.037 × (28.8 ÷ 16) -0.172 = 1.04;

[0141] The anti-sliding bearing capacity conversion coefficient X is calculated from Equation (20) Hmax (Edge loading) = 1.234 × (10 ÷ 40.5) -0.019 × (28.8 ÷ 16) -0.237 = 1.10, X Hmax (Diagonal loading) = 1.348 × (10 ÷ 40.5) 0.014 × (28.8 ÷ 16) -0.226 = 1.16;

[0142] The anti-overturning bearing capacity conversion coefficient X is calculated from Equation (21) M = 1.673 × (10 ÷ 40.5) -0.023 × (28.8 ÷ 16) -0.494 = 1.29, X M = 1.693 × (10 ÷ 40.5) -0.016 × (28.8 ÷ 16) -0.502 = 1.29;

[0143] (4) Calculate the vertical, anti-sliding (edge loading and diagonal loading), and anti-overturning (edge loading and diagonal loading) bearing capacities:

[0144] The vertical bearing capacity V of the five-connected cylinder is calculated from Equation (22) ult = 1288 × 20 × 8.566 × 1.04 = 229.49 MN;

[0145] The anti-sliding bearing capacity H of the five-connected cylinder under edge loading is calculated from Equation (23) maxult (Edge loading) = 1288 × 20 × 3.390 × 1.10 = 96.06 MN, and the anti-sliding bearing capacity H of the five-connected cylinder under diagonal loading is calculated from Equation (24) maxult (Diagonal loading) = 1288 × 20 × 3.390 × 1.16 = 101.30 MN;

[0146] The anti-overturning bearing capacity M of the five-connected cylinder under loading is calculated from Equation (25) ult(Opposite-side loading) = 1288 × 40.5 × 20 × 1.135 × 1.29 = 1527.52 MN·m. The anti-overturning bearing capacity M of the five-barrel diagonal loading is calculated from Equation (26). ult (Diagonal loading) = 1288 × 40.5 × 20 × 1.135 × 1.29 = 1527.52 MN·m.

[0147] The calculation device for the equivalent bearing capacity of the area of the five-barrel foundation for offshore wind power described below can be correspondingly referred to the calculation method for the equivalent bearing capacity of the area of the five-barrel foundation for offshore wind power described above.

[0148] Please refer to the appendix Figure 10 The present invention also provides a calculation device for the equivalent bearing capacity of the area of the five-barrel foundation for offshore wind power, including:

[0149] An input module 100, configured to receive data related to the five-barrel foundation, the equal-area single-barrel foundation, and the soil model, including but not limited to the geometric dimensions of the foundation, material properties, and the constitutive model parameters of the soil;

[0150] A finite element modeling module 200, configured to construct a finite element model including the five-barrel foundation, the equal-area single-barrel foundation, and the soil according to the data provided by the input module 100;

[0151] A numerical simulation module 300, configured to perform numerical simulation on the constructed model using finite element software, and calculate the one-way ultimate bearing capacity coefficients of the five-barrel foundation and the equal-area single-barrel foundation, including the vertical ultimate bearing capacity coefficient N cv , the anti-sliding ultimate bearing capacity coefficient N cHmax and the anti-overturning ultimate bearing capacity coefficient N cM ;

[0152] A bearing capacity conversion coefficient calculation module 400, configured to establish a bearing capacity conversion coefficient X according to the bearing capacity coefficients obtained by the numerical simulation module 300;

[0153] A bearing capacity calculation module 500, configured to calculate the vertical, anti-sliding, and anti-overturning bearing capacities of the five-barrel foundation by applying the bearing capacity conversion coefficient and the bearing capacity coefficients of the equal-area single-barrel foundation;

[0154] An output module 600, configured to output the calculation results, including the vertical, anti-sliding, and anti-overturning bearing capacity values of the five-barrel foundation.

[0155] The device of this embodiment can be used to execute the above method embodiment, and its principle and technical effects are similar, which will not be elaborated here.

[0156] Please refer to the appendix Figure 11, the present invention also provides a computer device 40, including: a processor 41 and a memory 42. The memory 42 stores a computer program executable by the processor. When the computer program is executed by the processor, the above method is performed.

[0157] The present invention also provides a storage medium 43. A computer program is stored on the storage medium 43. When the computer program is run by the processor 41, the above method is performed.

[0158] Among them, the storage medium 43 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (abbreviated as SRAM), electrically erasable programmable read-only memory (abbreviated as EEPROM), erasable programmable read-only memory (abbreviated as EPROM), programmable read-only memory (abbreviated as PROM), read-only memory (abbreviated as ROM), magnetic memory, flash memory, magnetic disk or optical disc.

[0159] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Calculation method for equivalent bearing capacity of the area of the five - connected cylinder foundation for offshore wind power, characterized in that, It includes the following steps: Construct a finite element model including a five - barrel foundation, an equal - area single - barrel foundation and a soil body model; Use finite element software for numerical simulation to calculate the one-way ultimate bearing capacity coefficients of the five-barrel foundation and the equal-area single-barrel foundation, including the vertical ultimate bearing capacity coefficient N cv , the anti-sliding ultimate bearing capacity coefficient N cHmax and the anti-overturning ultimate bearing capacity coefficient N cM ; Establish a bearing capacity conversion coefficient X, defined as the ratio of the unidirectional ultimate bearing capacity coefficient of the five - barrel foundation to the unidirectional ultimate bearing capacity coefficient of the equal - area single - barrel foundation; Apply the above conversion coefficient X and the bearing capacity coefficient of the equal - area single - barrel foundation to calculate the bearing capacity of the five - barrel foundation according to the following formula: Vertical bearing capacity V ult = As u N cv (equivalent single cylinder) × X v ; Anti-slip bearing capacity H maxult = As u N cHmax (equivalent single cylinder) × X Hmax ; Anti - overturning bearing capacity M ult = ADs u N cM (equivalent single cylinder)×X M Among them, A is the area of the basic top cover, s u is the undrained shear strength of the soil, D is the diameter of the area-equivalent single-tube foundation, N cv (equivalent single-tube), N cHmax (equivalent single-tube) and N cM (equivalent single-tube) are the vertical ultimate bearing capacity coefficient, anti-slip ultimate bearing capacity coefficient and anti-tipping ultimate bearing capacity coefficient of the equivalent single-tube foundation respectively, obtained by numerical simulation, X v 、X Hmax and X M are the conversion coefficients of the vertical, anti-slip and anti-tipping bearing capacities respectively, which are defined as the ratio of the bearing capacity coefficients of the five-tube foundation and the equivalent single-tube foundation in the corresponding bearing capacity directions.

2. The calculation method for the equivalent bearing capacity of the area of the five-connected barrel foundation for offshore wind power according to claim 1, characterized in that, The finite element model includes the geometric dimensions, material properties of the barrel foundation and the contact interface with the soil body.

3. The method for calculating the equivalent bearing capacity of the foundation area of the five-connected cylinder for offshore wind power according to claim 1, wherein, In the finite element model of the five - barrel foundation, the lateral boundary of the model is not less than 5 times the horizontal dimension of the foundation from the center of the barrel - shaped foundation, and the bottom foundation boundary of the model is not less than 4 times the vertical dimension of the foundation from the end of the foundation.

4. The method for calculating the equivalent bearing capacity of the foundation area of the five - connected barrel for offshore wind power according to claim 1, characterized in that, When performing the numerical simulation, the lateral boundary of the model is not less than five times the horizontal dimension of the foundation from the center of the barrel - shaped foundation, and the bottom foundation boundary of the model is not less than four times the vertical dimension of the foundation from the end of the foundation, and not less than three times the horizontal dimension of the foundation.

5. The calculation method for the equivalent bearing capacity of the foundation area of the five - connected cylinder for offshore wind power according to claim 1, wherein, The calculation formula of the bearing capacity conversion coefficient X is: Vertical bearing capacity conversion coefficient X v : Anti-slip bearing capacity conversion coefficient X Hmax : Anti-tipping bearing capacity conversion coefficient X M : Among them, L is the length of the tube skirt, D m is the diameter of the middle tube, D s is the diameter of the side tube.

6. The method for calculating the equivalent bearing capacity of the foundation area of the five-connected barrel for offshore wind power according to claim 1, wherein, The vertical ultimate bearing capacity coefficient N cv , the anti-sliding ultimate bearing capacity coefficient N cHmax and the anti-overturning ultimate bearing capacity coefficient N cM increase with the increase of the length-diameter ratio L / D and satisfy the following relationship: Vertical ultimate bearing capacity coefficient N cv : Anti-slip ultimate bearing capacity coefficient N cHmax : Coefficient N of ultimate anti-tipping bearing capacity cM : Wherein, L is the length of the barrel skirt, and D is the diameter of the equal - area single - barrel foundation.

7. The calculation method for the equivalent bearing capacity of the area of the five - connected barrel foundation for offshore wind power according to claim 1, characterized in that, The vertical ultimate bearing capacity coefficient N cv , the anti-sliding ultimate bearing capacity coefficient N cHmax and the anti-overturning ultimate bearing capacity coefficient N cM decrease with the increase of the length-diameter ratio D m / D s and satisfy the following relationship: Vertical ultimate bearing capacity coefficient N cv : Anti-slip ultimate bearing capacity coefficient N cHmax : Coefficient N of ultimate anti-tipping bearing capacity cM : Among them, D m is the middle cylinder diameter, and D S is the side cylinder diameter.

8. An apparatus for calculating the equivalent bearing capacity of the area of a five-barrel foundation for offshore wind power, which is used to implement the method for calculating the equivalent bearing capacity of the area of a five-barrel foundation for offshore wind power according to any one of claims 1-7, characterized in that, It includes: An input module for receiving data related to the five - barrel foundation, the equal - area single - barrel foundation and the soil body model, including but not limited to the geometric dimensions of the foundation, material properties and the constitutive model parameters of the soil body; A finite element modeling module for constructing a finite element model including a five - barrel foundation, an equal - area single - barrel foundation and the soil body according to the data provided by the input module; Numerical simulation module, which uses finite element software to perform numerical simulation on the constructed model, calculates the one-way ultimate bearing capacity coefficients of the five-barrel foundation and the equal-area single-barrel foundation, including the vertical ultimate bearing capacity coefficient N cv , the anti-sliding ultimate bearing capacity coefficient N cHmax and the anti-overturning ultimate bearing capacity coefficient N cM ; A bearing capacity conversion coefficient calculation module for establishing the bearing capacity conversion coefficient X according to the bearing capacity coefficient obtained by the numerical simulation module; A bearing capacity calculation module for calculating the vertical, anti - slip and anti - overturning bearing capacities of the five - barrel foundation by applying the bearing capacity conversion coefficient and the bearing capacity coefficient of the equal - area single - barrel foundation; An output module for outputting the calculation results, including the numerical values of the vertical, anti - slip and anti - overturning bearing capacities of the five - barrel foundation.

9. A computer device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method described in any one of claims 1 - 7.

10. A storage medium, on which a computer program is stored, characterized in that, When the computer program is executed by the processor, it implements the method described in any one of claims 1 - 7.

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