A method, system, device and medium for simulating deformation and creep of offshore seabed sediments under wave-induced loads

Abstract

The present invention provides a method, system, equipment and medium for simulating deformation and creep of offshore seabed sediments under wave-induced loads. The method includes: establishing a gridless discretized SPH particle model of offshore seabed slopes, assigning physical and mechanical parameters to seawater particles and slope sediment particles respectively; establishing an SPH wave-making method that can accurately simulate the action of cyclic wave-induced loads and a constitutive equation that can characterize the deformation and creep of seabed sediments; constructing a fluid-solid coupling relationship between wave action and deformation and creep of seabed sediments under the SPH framework, and finally realizing the SPH simulation of deformation and creep of offshore seabed sediments under wave-induced loads, effectively determining the critical deformation of seabed sediments under wave-induced loads, and determining the sliding opportunity of offshore seabed landslides under wave-induced loads. The present invention allows the sea wave hydrodynamic conditions to act directly on the seabed sediments, can intuitively reveal the mechanical response characteristics of the seabed sediments, and at the same time construct a mutual feedback mechanism between the deformation of the seabed sediments and the wave action form.

Description

Technical Field

[0001] The present invention belongs to the field of marine engineering technology, and in particular relates to a method, system, equipment and medium for simulating deformation creep of offshore seabed sediments under wave-induced loads. Background Art

[0002] Due to the changeable marine geological conditions and the complex forms of nearshore wave action, large-scale offshore projects have significantly changed the nearshore hydrodynamic conditions, and the coupled dynamic response mechanism between offshore structures and the seabed has become more complex. In addition, there is a natural submarine slope at the edge of the continental slope. The unconsolidated soft sediments or rocks with weak structural surfaces on the slope are prone to slide along the weak structural surfaces in the slope under external dynamic triggering conditions, thereby causing offshore submarine landslide disasters. The landslide body in submarine landslides often moves over long distances, causing obvious bottom erosion to the seabed area through which it flows, seriously threatening the structural stability and safety of offshore projects; large-scale submarine landslides can also cause tsunamis of varying degrees, causing significant production and economic losses to the nearshore. Therefore, there is an urgent need to carry out research on active prevention and control of offshore submarine landslide disasters. Scientifically understanding the timing and evolution process of slope disasters is the basis and prerequisite for achieving active prevention and control of submarine landslide disasters. The disaster evolution process of submarine landslides has relatively obvious stage characteristics. Under normal circumstances, when the slope deformation creeps to the critical point, it can be regarded as the sliding moment of submarine landslide disasters.

[0003] The factors affecting submarine slope instability are divided into intrinsic conditions of the slope and external dynamic triggering factors. Wave cyclic loads and wave-induced shearing will bring about elastic-plastic deformation or creep of seabed sediments, and also provide accumulation of slope energy for landslide disasters. Sudden changes in hydrodynamic conditions represented by waves will eventually trigger the occurrence of submarine landslide disasters.

[0004] At present, the simulation methods for submarine slope stability mainly include the smooth finite element method (S-FEM), the discrete element-computational fluid dynamics method (DEM-CFD / CFX) and the material point method (MPM). Although these methods simplify the complex hydrodynamic conditions, it is difficult to accurately obtain the initial failure moment of the landslide body and capture the interface characteristics of the sea waves. Therefore, it is difficult to reproduce the cyclic load of complex sea waves and effectively simulate the wave-induced shear effect through the above numerical simulation methods, and it is difficult to characterize the deformation effect of seabed sediments under wave-induced loads. Summary of the invention

[0005] The first object of the present invention is to provide a method for simulating the deformation and creep of offshore seabed sediments under wave-induced loads in response to the deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A method for simulating deformation creep of offshore seabed sediments under wave-induced loads comprises the following steps:

[0008] Construct a meshless discretized particle model of offshore seafloor slope;

[0009] Based on the measured data, the variation patterns of the wave pressure on the seabed surface and the excess pore water pressure inside the slope are obtained, and the wave-making parameters and wave action application forms of the sea wave load are corrected. In addition, a wave-making method simulating cyclic wave-induced loads and a constitutive equation characterizing the deformation and creep of seabed sediments are constructed.

[0010] The feedback factor of seabed sediment deformation and creep to seabed surface pressure is set according to the wave-making method and constitutive equation, and the fluid-solid coupling relationship between wave action and seabed sediment deformation and creep under the particle model is obtained.

[0011] Based on the fluid-solid coupling relationship, the deformation and creep of offshore seabed sediments under wave-induced loads are simulated to effectively determine the critical deformation of seabed sediments under wave-induced loads, as well as the timing of offshore seabed landslides under wave-induced loads.

[0012] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0013] As a preferred technical solution of the present invention: in a meshless discrete particle model of offshore seabed slope, a velocity no-slip boundary particle layer is set by setting the wave-making area and the wave-breaking area, and different wave forms are generated by the cyclic motion of the wave-pushing plate in the wave-making area, and the wave-breaking area is used to break waves and eliminate the backflow of waves, so as to obtain the movement forms of the wave-pushing plate under different wave loads.

[0014] As a preferred technical solution of the present invention: the construction process of the wave-making method for simulating the action of cyclic wave-induced loads includes: comparing the simulated slope cyclic wave pressure after wave making and wave breaking with the measured slope wave pressure, and if the degree of agreement is lower than a threshold, correcting the motion form of the wave-pushing plate and the wave breaking form of the wave breaking area, and adjusting the wave motion parameters and the wave breaking parameters until the simulated slope cyclic wave pressure matches the measured slope wave pressure, thereby obtaining the wave-making method for simulating the action of cyclic wave-induced loads.

[0015] As a preferred technical solution of the present invention: the process of constructing the constitutive equation that characterizes the deformation and creep of seabed sediments includes: applying cyclic wave action to the particle model, and determining the physical quantity parameters of the viscoplastic constitutive equation and the flow law of the seabed sediments according to the variation law of the pore water pressure inside the particle model and the deformation and creep characteristics.

[0016] As a preferred technical solution of the present invention: the process of constructing the constitutive equation for characterizing the deformation and creep of seabed sediments also includes: considering the wave load on the seabed and introducing the wave-induced load action factor into the constitutive equation.

[0017] As a preferred technical solution of the present invention: according to the wave-making method and the constitutive equation, the changing characteristics of the seabed surface pressure and the deformation and creep of the seabed sediments are simulated and monitored, and the negative feedback factor of the deformation and creep of the seabed sediments to the seabed surface pressure is set by fitting the functional relationship between the two, so as to construct the fluid-solid coupling relationship between the wave action and the deformation and creep of the seabed sediments under the particle model.

[0018] As a preferred technical solution of the present invention: the simulation process of critical deformation and slip timing of offshore seabed sediments includes: constructing particle models under different working conditions, and applying different wave-making plate motion forms, by obtaining the variation law of excess pore water pressure inside the slope and the deformation creep of seabed sediments, determining the critical deformation of offshore seabed sediments under wave-induced loads, thereby determining the slip timing of the offshore seabed under wave-induced loads.

[0019] The second object of the present invention is to provide a system for simulating the deformation and creep of offshore seabed sediments under wave-induced loads in response to the deficiencies in the prior art.

[0020] In order to achieve the above object, the present invention adopts the following technical solution:

[0021] A system for simulating deformation and creep of offshore seabed sediments under wave-induced loads, comprising:

[0022] A model building module, wherein the model building module is configured to build a meshless discretized particle model of an offshore seafloor slope;

[0023] A simulation method construction module, wherein the simulation method construction module is configured to obtain the variation law of the wave pressure on the seabed surface and the excess pore water pressure inside the slope according to the measured data, thereby correcting the wave-making parameters and wave action application form of the sea wave load, and constructing a wave-making method for simulating cyclic wave-induced loads and a constitutive equation for characterizing the deformation and creep of seabed sediments;

[0024] A fluid-solid coupling relationship determination module, wherein the fluid-solid coupling relationship determination module is configured to set a feedback factor of seabed sediment deformation and creep to seabed surface pressure according to a wave-making method and a constitutive equation, and obtain a fluid-solid coupling relationship between wave action and seabed sediment deformation and creep under a particle model;

[0025] A simulation module is configured to simulate the deformation and creep of offshore seabed sediments under wave-induced loads based on a fluid-solid coupling relationship, and obtain critical deformation and slip timing of offshore seabed sediments.

[0026] The third object of the present invention is to provide an electronic device in view of the deficiencies in the prior art, the electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus, the memory is used to store computer programs, and the processor is used to execute the computer programs stored in the memory to implement the steps of the method for simulating the deformation and creep of offshore seabed sediments under wave-induced loads as described above.

[0027] The fourth object of the present invention is to provide a computer-readable storage medium to address the deficiencies in the prior art, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for simulating the deformation and creep of offshore seabed sediments under wave-induced loads described above are implemented.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention proposes a simulation method for realizing the effects of wave cyclic load and wave-induced shear based on SPH (Smoothed Particle Hydrodynamics), establishes a gridless discretized SPH particle model of offshore submarine slope, and assigns physical and mechanical parameters to seawater particles and slope sediment particles respectively; establishes an SPH wave-making method that can accurately simulate the effects of cyclic wave-induced load and a constitutive equation that can characterize the deformation and creep of seabed sediments; constructs a fluid-solid coupling relationship between wave action and deformation and creep of seabed sediments under the SPH framework, and finally realizes the SPH simulation of deformation and creep of offshore seabed sediments under wave-induced load, effectively determines the critical deformation of seabed sediments under wave-induced load, and determines the sliding timing of offshore seabed landslides under wave-induced load.

[0030] The simulation method of the present invention enables the sea wave hydrodynamic conditions to act directly on the seabed sediments, which can intuitively reveal the mechanical response characteristics of the seabed sediments, and at the same time construct a feedback mechanism between the deformation of the seabed sediments and the wave action form, avoiding complex coupling boundary processing and pre-determining the potential position of the slip surface. It can track the interface characteristics of the sea waves and the deformation and creep of the seabed sediments in real time, providing an effective technical means for determining the timing of submarine landslide disasters, and providing a reasonable and accurate calculation method for determining the timing of submarine landslide disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention provides a flow chart of a method for simulating deformation and creep of offshore seabed sediments under wave-induced loads.

[0032] Figure 2This is a simplified diagram of the SPH simulation of the cyclic wave pressure on the offshore seabed under the action of waves provided by the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Among the simulation methods of submarine slope stability, compared with the grid-based numerical method, the SPH method is a meshless adaptive Lagrangian particle method for simulating fluid flow. The SPH method has the characteristics of harmonious combination of Lagrangian formula and particle approximation method. Compared with other meshless methods where the meshless nodes are only used as interpolation points, the particles in the SPH method carry material properties at the same time, can move under external forces and internal interactions, and have the function of being both approximate points and material components. The SPH method can simulate the fluid to obtain the data results of each particle in the calculation domain, making it easier to track the fluid flow characteristics and reconstruct the fluid surface; at the same time, the SPH method can calculate the corresponding stress and strain inside the solid material, thereby revealing the structural characteristics of the submarine slope. The SPH method has been proven to be able to obtain stable numerical results by using arbitrarily distributed points to solve many problems with extremely large deformations. Therefore, the SPH method can be used to construct a simulation method for the deformation and creep of seabed sediments under wave action.

[0037] Based on this, Figure 1 As shown, this embodiment provides a method for simulating deformation creep of offshore seabed sediments under wave-induced loads, which specifically includes the following steps:

[0038] S1. Construct a meshless discretized particle model of offshore seafloor slope;

[0039] Specifically, a typical submarine slope of offshore engineering is selected, and a gridless discrete SPH particle model of the offshore submarine slope is established. At the same time, physical and mechanical parameters are assigned to seawater particles and slope sediment particles respectively. The wave action is applied through the wave-making plate pushing method, and the SPH simulation of the wave action on the submarine slope is carried out. At the same time, the cyclic wave pressure on the slope surface of the particle model and the change characteristics of the excess pore water pressure inside the seabed sediments are monitored.

[0040] like Figure 2 As shown, in the SPH particle model of the submarine slope, a velocity no-slip boundary particle layer is set. Taking into account the attenuation of the intensity of sea wave action with the depth of sea water, a wave-making particle area and a wave-breaking particle area are set. Different wave forms are generated by the cyclic motion of the wave-pushing plate in the wave-making area. At the same time, by setting the wave-breaking area, wave breaking and wave backflow elimination are achieved. The influence of the wave-pushing plate motion on wave elements such as wave period, wavelength, amplitude, and wave speed can be studied, so that the wave-pushing plate motion forms under different wave loads can be realized.

[0041] S2. Based on the measured data, the variation law of the wave pressure on the seabed surface and the excess pore water pressure inside the slope is obtained, so as to modify the wave-making parameters and wave action application form of the sea wave load, and construct a wave-making method to simulate the cyclic wave-induced load and a constitutive equation to characterize the deformation and creep of seabed sediments;

[0042] Specifically, combined with the measured data obtained from field monitoring of submarine slopes or indoor model tests of seabed wave-induced loads, the changing patterns of the wave pressure on the seabed surface and the excess pore water pressure inside the slope are obtained. Then, the measured data are compared with the seabed surface wave pressure in the simulation test, the wave application form and the wave-making parameters of the sea wave load are corrected, and the SPH wave-making method that can accurately simulate the effects of cyclic wave-induced loads is obtained.

[0043] The correction process includes: in the SPH simulation process of wave action, comparing the slope circulating wave pressure in the simulation after wave generation and wave breaking with the slope wave pressure of actual measurement or model test, if the degree of agreement is lower than the threshold, then re-correcting the movement form of the wave-thrusting plate and the wave breaking form of the wave breaking area, and making the wave pressure on the slope surface in the simulation better match the actual slope wave pressure by repeatedly debugging the wave motion parameters and wave breaking parameters, thereby ensuring the feasibility and accuracy of the SPH wave generation method in simulating the actual wave-induced load effect.

[0044] According to the seabed surface wave pressure and SPH wave generation method obtained above, the SPH particle model of the submarine slope is adopted, the typical viscoelastic-plastic constitutive equation and the non-associated flow law of the seabed sediment (slope) are selected, and the cyclic wave action is applied to the particle model. The variation law of the seabed excess pore water pressure inside the slope model and the deformation creep characteristics of the slope are observed. The simulation parameters are adjusted by comparing the variation law of the excess pore water pressure inside the slope model to determine the physical quantity parameters of the viscoplastic constitutive equation of the seabed sediment and the flow law.

[0045] Then, considering the wave load on the seabed, the cyclic wave pressure causes the seabed to be subjected to cyclic shear stress, resulting in excess pore water pressure inside it. The wave-induced load factor is introduced to obtain the SPH system constitutive equation, which can accurately characterize the deformation and creep characteristics of seabed sediments under wave-induced loads.

[0046] In offshore areas, in addition to directly acting on marine structures to form external loads, the cyclic wave pressure (or wave pressure that varies with time) formed on the seabed surface will cause the seabed rock and soil to be subjected to cyclic shear stress. For seabeds with poor drainage (such as silty sand seabeds), excess pore water pressure will be generated inside and propagate to the seabed in the form of a certain damping ratio and phase lag. The increase in excess pore water pressure and the decrease in effective stress will lead to a decrease in the shear strength of the seabed. When the excess pore water pressure is greater than the effective stress, the seabed will become unstable.

[0047] S3. According to the wave-making method and the constitutive equation, the feedback factor of the seabed deformation creep to the seabed surface pressure is set to obtain the fluid-solid coupling relationship between the wave action and the seabed sediment deformation creep under the particle model;

[0048] Specifically, the above-mentioned wave-making method is combined with the constitutive equation of the deformation and creep characteristics of seabed sediments, the seabed surface pressure and the changing characteristics of the deformation and creep of seabed sediments are simulated and monitored, and the functional relationship between the two is fitted, so as to set the negative feedback factor of the seabed deformation and creep on the seabed surface pressure, thereby constructing the fluid-solid coupling relationship between wave action and seabed sediment deformation and creep under the SPH particle model, so as to realize the SPH simulation of the deformation and creep of offshore seabed sediments under wave-induced loads.

[0049] The cyclic wave pressure on the seabed surface will cause cyclic changes in the excess pore water pressure of the seabed. The excess pore water pressure will dissipate as the waves propagate, and it is a function of the wave propagation time. During wave-induced loading, the excess pore water pressure is maximum, and the deformation creep of the seabed sediment is minimum. During wave-induced unloading, the excess pore water pressure is released, the deformation creep of the seabed is maximum, and the wave pressure on the seabed surface also changes accordingly, thereby affecting the wave propagation form of the seabed and the seawater surface.

[0050] S4. Based on the fluid-solid coupling relationship, SPH simulation of the deformation and creep of offshore seabed sediments under wave-induced loads is carried out to obtain the critical deformation and sliding timing of offshore seabed sediments.

[0051] In this embodiment, an SPH particle model of a submarine slope under different working conditions is established, and different forms of motion of wave-making plates are applied to carry out an SPH simulation of deformation and creep of offshore seabed sediments under wave loads. The evolution law of slope excess pore water pressure and slope deformation and creep is studied, and the critical deformation of seabed sediments under wave-induced loads is determined, thereby determining the sliding timing of the offshore seabed under wave-induced loads.

[0052] A system for simulating deformation and creep of offshore seabed sediments under wave-induced loads, comprising:

[0053] A model building module, wherein the model building module is configured to build a meshless discretized particle model of an offshore seafloor slope;

[0054] A simulation method construction module, wherein the simulation method construction module is configured to obtain the variation law of the wave pressure on the seabed surface and the excess pore water pressure inside the slope according to the measured data, thereby correcting the wave-making parameters and wave action application form of the sea wave load, and constructing a wave-making method for simulating cyclic wave-induced loads and a constitutive equation for characterizing the deformation and creep of seabed sediments;

[0055] A fluid-solid coupling relationship determination module, wherein the fluid-solid coupling relationship determination module is configured to set a feedback factor of seabed sediment deformation and creep to seabed surface pressure according to a wave-making method and a constitutive equation, and obtain a fluid-solid coupling relationship between wave action and seabed sediment deformation and creep under a particle model;

[0056] A simulation module is configured to simulate the deformation and creep of offshore seabed sediments under wave-induced loads based on a fluid-solid coupling relationship, and obtain critical deformation and slip timing of offshore seabed sediments.

[0057] It should be noted that the above modules correspond to the above method steps, and the examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments. It should be noted that the above modules, as part of the system, can be executed in a computer system such as a set of computer executable instructions.

[0058] The present invention also provides an electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to implement the steps of the method for simulating deformation and creep of offshore seabed sediments under wave-induced loads as described above.

[0059] It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general-purpose processors, digital signal processors DSP, application-specific integrated circuits ASIC, off-the-shelf programmable gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0060] The memory may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type.

[0061] The present invention also provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the steps of the method for simulating deformation and creep of offshore seabed sediments under wave-induced loads described above are implemented.

[0062] The above method can be directly implemented as a hardware processor, or can be implemented by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0063] Those skilled in the art will appreciate that the units, i.e., algorithm steps, of the various examples described in conjunction with this embodiment can be implemented in electronic hardware or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0064] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for simulating the deformation and creep of offshore seabed sediments under wave-induced loads. Features: The method comprises the following steps: Construct a meshless discretized particle model of offshore seafloor slope; Based on the measured data, the variation patterns of the wave pressure on the seabed surface and the excess pore water pressure inside the slope are obtained, and the wave-making parameters and wave action application forms of the sea wave load are corrected. In addition, a wave-making method simulating cyclic wave-induced loads and a constitutive equation characterizing the deformation and creep of seabed sediments are constructed. The feedback factor of seabed sediment deformation and creep to seabed surface pressure is set according to the wave-making method and constitutive equation, and the fluid-solid coupling relationship between wave action and seabed sediment deformation and creep under the particle model is obtained. Based on the fluid-solid coupling relationship, the deformation and creep of offshore seabed sediments under wave-induced loads are simulated to effectively determine the critical deformation of seabed sediments under wave-induced loads, as well as the timing of offshore seabed landslides under wave-induced loads.

2. The method for simulating deformation and creep of offshore seabed sediments under wave-induced loads according to claim 1, Features: In the meshless discrete particle model of offshore submarine slope, velocity no-slip boundary particle layers are set in the wave-making area and the wave-breaking area. Different wave forms are generated by the cyclic motion of the wave-pushing plate in the wave-making area, and the wave breaking and wave backflow elimination in the wave-breaking area are carried out to obtain the motion forms of the wave-pushing plate under different wave loads.

3. The method for simulating deformation and creep of offshore seabed sediments under wave-induced loads according to claim 1, Features: The construction process of the wave-making method for simulating the action of cyclic wave-induced loads includes: comparing the simulated slope cyclic wave pressure after wave making and wave breaking with the measured slope wave pressure. If the degree of agreement is lower than a threshold, the movement form of the wave-pushing plate and the wave breaking form of the wave breaking area are corrected. By adjusting the wave motion parameters and the wave breaking parameters, the simulated slope cyclic wave pressure is consistent with the measured slope wave pressure, thereby obtaining the wave-making method for simulating the action of cyclic wave-induced loads.

4. The method for simulating deformation and creep of offshore seabed sediments under wave-induced loads according to claim 1, Features: The process of constructing the constitutive equation that characterizes the deformation and creep of seabed sediments includes: applying cyclic wave action to the particle model, and determining the physical quantity parameters of the viscoplastic constitutive equation and flow law of the seabed sediments based on the variation law of pore water pressure inside the particle model and the deformation and creep characteristics.

5. The method for simulating deformation creep of offshore seabed sediments under wave-induced loads according to claim 1, Features: The process of constructing the constitutive equation that characterizes the deformation and creep of seabed sediments also includes: considering the wave load on the seabed and introducing the wave-induced load action factor into the constitutive equation.

6. The method for simulating deformation and creep of offshore seabed sediments under wave-induced loads according to claim 1, Features: According to the wave-making method and constitutive equation, the changing characteristics of seabed surface pressure and seabed sediment deformation and creep are simulated and monitored. By fitting the functional relationship between the two, the negative feedback factor of seabed sediment deformation and creep to seabed surface pressure is set, thereby constructing the fluid-solid coupling relationship between wave action and seabed sediment deformation and creep under the particle model.

7. The method for simulating deformation creep of offshore seabed sediments under wave-induced loads according to claim 1, Features: The simulation process of critical deformation and slip timing of offshore seabed sediments includes: constructing particle models under different working conditions and applying different wave-making plate motion forms, and determining the critical deformation of offshore seabed sediments under wave-induced loads by obtaining the changing laws of excess pore water pressure inside the slope and deformation creep of seabed sediments, thereby determining the slip timing of the offshore seabed under wave-induced loads.

8. A system for simulating the deformation and creep of offshore seabed sediments under wave-induced loads. Features: The system comprises: A model building module, wherein the model building module is configured to build a meshless discretized particle model of an offshore seafloor slope; A simulation method construction module, wherein the simulation method construction module is configured to obtain the variation law of the wave pressure on the seabed surface and the excess pore water pressure inside the slope according to the measured data, thereby correcting the wave-making parameters and wave action application form of the sea wave load, and constructing a wave-making method for simulating cyclic wave-induced loads and a constitutive equation for characterizing the deformation and creep of seabed sediments; A fluid-solid coupling relationship determination module, wherein the fluid-solid coupling relationship determination module is configured to set a feedback factor of seabed sediment deformation and creep to seabed surface pressure according to a wave-making method and a constitutive equation, and obtain a fluid-solid coupling relationship between wave action and seabed sediment deformation and creep under a particle model; A simulation module is configured to simulate the deformation and creep of offshore seabed sediments under wave-induced loads based on a fluid-solid coupling relationship, and obtain critical deformation and slip timing of offshore seabed sediments.

9. An electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus. Features: a memory for storing a computer program, A processor, wherein the processor is used to execute a computer program stored in a memory to implement the steps of a method for simulating deformation and creep of offshore seabed sediments under wave-induced loads as described in any one of claims 1 to 7.

10. A computer-readable storage medium, Features: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for simulating deformation and creep of offshore seabed sediments under wave-induced loads described in any one of claims 1 to 7 are implemented.

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