Method for constructing chloride ion corrosion model and simulation method for chloride ion corrosion

Abstract

The present invention provides a method for constructing a chloride ion corrosion model and a method for simulating chloride ion corrosion. The method for constructing a chloride ion corrosion model includes: obtaining the wave impact cycle and the corresponding chloride ion concentration in the concrete splash zone under each wave working condition; based on the chloride ion concentration in the concrete splash zone of each wave impact cycle, respectively determining the parameters in the corresponding one-dimensional fractal derivative diffusion equation, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time; based on the parameters in the one-dimensional fractal derivative diffusion equation, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time, a chloride ion corrosion model is established. Through the present invention, the chloride ion corrosion process in concrete can be accurately described, providing a basis for the maintenance of offshore concrete platforms.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of numerical simulation, and in particular to a method for constructing a chloride ion corrosion model and a method for simulating chloride ion corrosion. Background Art

[0002] With the gradual development of offshore resources, offshore wind power projects continue to develop in the deep sea. As the water depth increases in the deep sea, fixed support structures are more difficult to build. Therefore, floating technology is generally used in the construction of deep sea wind power projects. At the same time, due to the long distance from the land and the high cost of power transmission, in order to reduce costs, floating structures are mostly offshore concrete platforms. However, marine concrete is easily corroded by chloride ions from seawater and sea breeze, especially the external environment faced by the splash zone of the concrete platform is more severe. Therefore, accurately depicting the chloride ion diffusion process in the splash zone of the offshore concrete platform is of great significance to improving the maintenance level of the offshore concrete platform and extending its service life.

[0003] In the prior art, the classic solute transport simulation method is used to describe the complex migration process of chloride ions in concrete. However, the influence of changes in conditions such as sea surface wind speed and wave periodicity is not considered, making it difficult to accurately describe the complex migration process of chloride ions in concrete. Summary of the invention

[0004] In order to accurately describe the corrosion process of chloride ions in concrete and provide a basis for the maintenance of offshore concrete platforms, the present invention proposes a chloride ion corrosion model construction method and a chloride ion corrosion simulation method.

[0005] In a first aspect, the present invention provides a method for constructing a chloride ion corrosion model, the method comprising:

[0006] Obtain the wave impact cycle under each wave condition and the chloride ion concentration in the concrete splash zone at each wave impact cycle;

[0007] Based on the chloride ion concentration in the concrete splash zone of each wave impact cycle, the parameters in the one-dimensional fractal derivative diffusion equation corresponding to each wave impact cycle, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time are determined respectively;

[0008] Based on the parameters in the one-dimensional fractal derivative diffusion equation, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time, a chloride ion corrosion model is established. The chloride ion corrosion model is used to simulate the change of chloride ion concentration in the concrete splash zone under various wave conditions. The chloride ion corrosion model includes multiple one-dimensional fractal derivative diffusion equations, and each one-dimensional fractal derivative diffusion equation corresponds to a wave impact cycle.

[0009] Considering that the chloride ion concentration at the concrete boundary changes differently when the wave conditions and wave impact cycles are different, the above method uses the functional relationship between the chloride ion concentration at the boundary and time and the functional relationship between the fractal derivative order and time according to the wave conditions in the concrete splash zone to establish a chloride ion corrosion model composed of multiple one-dimensional fractal derivative diffusion equations. Each wave cycle corresponds to a one-dimensional fractal derivative diffusion equation. In the one-dimensional fractal derivative diffusion equations corresponding to different wave impact cycles, the chloride ion concentration and fractal derivative order at the boundary are different. The chloride ion corrosion model established by this method can more finely and accurately describe the concentration change of chloride ions in concrete, reflect the chloride ion corrosion process, and provide a basis for the maintenance of offshore concrete platforms.

[0010] In combination with the first aspect, in a first embodiment of the first aspect, the functional relationship between the fractal derivative order and time is an increasing function, wherein the increasing coefficient in the increasing function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period.

[0011] In combination with the first embodiment of the first aspect, in the second embodiment of the first aspect, the functional relationship between the chloride ion concentration at the boundary and time is an attenuation function, wherein the attenuation coefficient in the attenuation function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period.

[0012] In combination with the first aspect, in a third embodiment of the first aspect, the chloride ion corrosion model is expressed as follows:

[0013]

[0014] ...

[0016]

[0017] c(0,t)=CP(t)

[0018] in, is the fractal derivative; α m represents the fractal derivative order of the mth period; A is the convection parameter; D is the diffusion parameter; c is the concentration of chloride ions in concrete; t is time; x is the spatial position, and the direction is the surface normal direction; T is the wave impact period; P(t) is the chloride ion concentration at the boundary at time t.

[0019] In combination with the first embodiment of the first aspect or the third embodiment of the first aspect, in a fourth embodiment of the first aspect, the functional relationship between the fractal derivative order and time is expressed as follows:

[0020] W(t)=1 / (2-μ(tT) / (T))

[0021] Among them, W(t) represents the fractal derivative order at time t, μ is the increasing coefficient, and T is the wave impact period.

[0022] In combination with the second embodiment of the first aspect or the third embodiment of the first aspect, in a fifth embodiment of the first aspect, the functional relationship between the chloride ion concentration at the boundary and the time is expressed as follows:

[0023] P(t)=1 / (1+β(t-T1)), T1 <t<T2

[0024] Among them, P(t) represents the chloride ion concentration at the boundary at time t, β is the attenuation coefficient, T1 is the end time of the previous cycle, and T2 is the end time of this cycle.

[0025] In a second aspect, the present invention further provides a method for simulating chloride ion corrosion, the method comprising:

[0026] Get the current wave conditions and wave impact period;

[0027] Based on the current wave conditions, wave impact cycle and chloride ion erosion model, the change of chloride ion concentration in the concrete splash zone is simulated. The chloride ion erosion model is established by the chloride ion erosion model construction method in the first aspect or any embodiment of the first aspect.

[0028] Through the above method, the chloride ion erosion model was used to simulate the concentration change of chloride ions inside the concrete of the splash zone of the offshore concrete platform under wave impact. The model was constructed by multiple one-dimensional fractal derivative diffusion equations. Each wave cycle corresponds to a one-dimensional fractal derivative diffusion equation. In the one-dimensional fractal derivative diffusion equations corresponding to different wave impact cycles, the chloride ion concentration at the boundary and the fractal derivative order are different. Due to different wave conditions and wave impact cycles, the chloride ion concentration at the concrete boundary changes differently. Therefore, the chloride ion erosion model can more finely and accurately describe the concentration change of chloride ions in concrete, reflect the chloride ion erosion process, and provide a basis for the maintenance of offshore concrete platforms.

[0029] In a third aspect, the present invention further provides a chloride ion corrosion model construction device, the device comprising:

[0030] The first acquisition module is used to obtain the wave impact cycle under each wave working condition and the chloride ion concentration in the concrete splash zone of each wave impact cycle;

[0031] A determination module is used to determine the parameters in the one-dimensional fractal derivative diffusion equation corresponding to each wave impact cycle, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time based on the chloride ion concentration in the concrete splash zone of each wave impact cycle;

[0032] A module is established to establish a chloride ion corrosion model based on the parameters in the one-dimensional fractal derivative diffusion equation, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time. The chloride ion corrosion model is used to simulate the change in chloride ion concentration in the concrete splash zone under various wave conditions. The chloride ion corrosion model includes multiple one-dimensional fractal derivative diffusion equations, and each one-dimensional fractal derivative diffusion equation corresponds to a wave impact cycle.

[0033] Taking into account that the chloride ion concentration at the concrete boundary changes differently when the wave conditions and wave impact cycles are different, the above-mentioned device uses the functional relationship between the chloride ion concentration at the boundary and time and the functional relationship between the fractal derivative order and time according to the wave conditions in the concrete splash zone to establish a chloride ion corrosion model composed of multiple one-dimensional fractal derivative diffusion equations. Each wave cycle corresponds to a one-dimensional fractal derivative diffusion equation. In the one-dimensional fractal derivative diffusion equations corresponding to different wave impact cycles, the chloride ion concentration and the fractal derivative order at the boundary are different. The chloride ion corrosion model established by this device can more finely and accurately describe the concentration changes of chloride ions in concrete, reflect the chloride ion corrosion process, and provide a basis for the maintenance of offshore concrete platforms.

[0034] In a fourth aspect, the present invention further provides a simulation device for chloride ion corrosion, the device comprising:

[0035] The second acquisition module is used to obtain the current wave conditions and wave impact period;

[0036] A simulation module is used to simulate the change of chloride ion concentration in the concrete splash zone based on the current wave condition, wave impact cycle and chloride ion erosion model, wherein the chloride ion erosion model is established by the chloride ion erosion model construction method in the first aspect or any embodiment of the first aspect.

[0037] Through the above device, the chloride ion erosion model was used to simulate the concentration change of chloride ions inside the concrete of the splash zone of the offshore concrete platform under wave impact. The model was constructed by multiple one-dimensional fractal derivative diffusion equations. Each wave cycle corresponds to a one-dimensional fractal derivative diffusion equation. In the one-dimensional fractal derivative diffusion equations corresponding to different wave impact cycles, the chloride ion concentration at the boundary and the fractal derivative order are different. Due to different wave conditions and wave impact cycles, the chloride ion concentration at the concrete boundary changes differently. Therefore, the chloride ion erosion model can more finely and accurately describe the concentration change of chloride ions in the concrete, reflect the chloride ion erosion process, and provide a basis for the maintenance of offshore concrete platforms.

[0038] In a fifth aspect, the present invention further provides a computer device, comprising a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to execute the method for constructing a chloride ion corrosion model of the first aspect or any embodiment of the first aspect, or the steps of the method for simulating chloride ion corrosion of the second aspect or any embodiment of the second aspect.

[0039] In a sixth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for constructing a chloride ion corrosion model of the first aspect or any embodiment of the first aspect, or the steps of the method for simulating chloride ion corrosion of the second aspect or any embodiment of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 is a flow chart of a method for constructing a chloride ion corrosion model according to an exemplary embodiment;

[0042] Figure 2 is a flow chart of a method for simulating chloride ion corrosion according to an exemplary embodiment;

[0043] Figure 3 In one example, at the final time 288s, the corresponding chloride ion concentration changes at different positions inside the concrete from the outer surface;

[0044] Figure 4 In one example, the concentration of chloride ions in the concrete changes with time at a distance of 122.5 mm from the outer surface;

[0045] Figure 5 A schematic structural diagram of a chloride ion corrosion model construction device proposed according to an exemplary embodiment;

[0046] Figure 6 It is a schematic structural diagram of a simulation device for chloride ion corrosion according to an exemplary embodiment;

[0047] Figure 7 It is a schematic diagram of the hardware structure of a computer device proposed according to an exemplary embodiment. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] In order to accurately describe the corrosion process of chloride ions in concrete and provide a basis for the maintenance of offshore concrete platforms, the present invention proposes a chloride ion corrosion model construction method and a chloride ion corrosion simulation method.

[0051] Figure 1 FIG. 1 is a flow chart of a method for constructing a chloride ion corrosion model according to an exemplary embodiment. Figure 1 As shown, the method includes the following steps S101 to S103.

[0052] Step S101: obtaining the wave impact cycle under each wave condition and the chloride ion concentration in the concrete splash zone in each wave impact cycle.

[0053] Specifically, wave conditions include sea surface humidity and seawater chloride ion concentration. Under different wave impact cycles and different working conditions, the chloride ion concentration in the concrete splash zone changes differently. By collecting the marine environmental parameters of the target sea area, the corresponding experimental scene can be established to simulate various wave conditions, and then the concentration changes of chloride ions under different wave impact cycle conditions can be obtained.

[0054] Step S102: Based on the chloride ion concentration in the concrete splash zone of each wave impact cycle, the parameters in the one-dimensional fractal derivative diffusion equation corresponding to each wave impact cycle, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time are determined respectively.

[0055] Specifically, the parameters in the one-dimensional fractal derivative diffusion equation include convection parameters and diffusion parameters. Under different wave impact cycles and different working conditions, the change of chloride ion concentration is different. When the wave cycle is fixed, the change of chloride ion concentration in the previous cycle and the next cycle is also different. Therefore, the parameters in the one-dimensional fractal derivative diffusion equation corresponding to different wave impact cycles, the fractal derivative order, and the chloride ion concentration at the boundary are also different.

[0056] Step S103: Based on the parameters in the one-dimensional fractal derivative diffusion equation, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time, a chloride ion corrosion model is established. The chloride ion corrosion model is used to simulate the change in chloride ion concentration in the concrete splash zone under various wave conditions. The chloride ion corrosion model includes multiple one-dimensional fractal derivative diffusion equations, and each one-dimensional fractal derivative diffusion equation corresponds to a wave impact cycle.

[0057] Specifically, the chloride ion erosion model contains multiple stages of one-dimensional fractal derivative diffusion equations, each stage corresponds to a wave impact cycle, and due to the different changes in chloride ion concentrations, the corresponding one-dimensional fractal derivative diffusion equations are also different.

[0058] Considering that the chloride ion concentration at the concrete boundary changes differently when the wave conditions and wave impact cycles are different, the method provided in the embodiment of the present invention uses the functional relationship between the chloride ion concentration at the boundary and time and the functional relationship between the fractal derivative order and time according to the wave conditions in the concrete splash zone to establish a chloride ion corrosion model composed of multiple one-dimensional fractal derivative diffusion equations. Each wave cycle corresponds to a one-dimensional fractal derivative diffusion equation. In the one-dimensional fractal derivative diffusion equations corresponding to different wave impact cycles, the chloride ion concentration and the fractal derivative order at the boundary are different. The chloride ion corrosion model established by the embodiment of the present invention can more finely and accurately describe the concentration change of chloride ions in concrete, reflect the chloride ion corrosion process, and provide a basis for the maintenance of offshore concrete platforms.

[0059] In one example, the chloride ion corrosion model is expressed as follows:

[0060]

[0061] ...

[0063]

[0064] c(0,t)=CP(t)

[0065] in, is the fractal derivative, defined as α is the fractal derivative order, 0<α≤1, different subscripts represent different fractal derivative order values ​​of wave impact cycles; A is the convection parameter; D is the diffusion parameter; c is the concentration of chloride ions in concrete; t is time; x is the spatial position, 0 is the surface of the concrete splash zone, and the direction is the surface normal direction; Ttot is the total simulation time, is the symbol for rounding up; P(t) is the chloride ion concentration at the boundary at time t.

[0066] Exemplarily, the discrete form of the fractal derivative can be expressed as:

[0067]

[0068] Among them, Δt k r =t k+1 r -t k r , t k Indicates the kth moment, each time period has n points, the total number of points is mn, 0 <k<mn。

[0069] In one example, the functional relationship between the fractal derivative order and time in the chloride ion corrosion model is an increasing function, wherein the increasing coefficient in the increasing function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period.

[0070] In an optional embodiment, the functional relationship between the fractal derivative order and time is expressed as follows:

[0071] α m =1 / (2-μ(mT-T) / (T))α1

[0072] Among them, α m represents the fractal derivative order of the mth cycle, μ is the increasing coefficient, T is the wave impact cycle, and α1 represents the fractal derivative order of the first cycle. As time goes by, the binding effect and hydration effect of concrete on chloride ions gradually decrease, and the fractal derivative order gradually tends to 1.

[0073] In another example, in the chloride ion erosion model, the functional relationship between the chloride ion concentration at the boundary and time is an attenuation function, wherein the attenuation coefficient in the attenuation function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period.

[0074] In an optional embodiment, the functional relationship between the chloride ion concentration at the boundary and time is expressed as follows:

[0075] P(t)=1 / (1+β(t-T1)), T1 <t<T2

[0076] Among them, P(t) represents the chloride ion concentration at the boundary at time t, β is the attenuation coefficient, T1 is the end time of the previous cycle, and T2 is the end time of this cycle.

[0077] In one example, an embodiment of the present invention provides a simulation method for chloride ion corrosion, such as Figure 2 As shown, the method comprises the following steps:

[0078] Step S201: Obtain current wave conditions and wave impact period.

[0079] Step S202: Based on the current wave condition, wave impact cycle and chloride ion corrosion model, simulate the change of chloride ion concentration in the concrete splash zone. The chloride ion corrosion model is established by the chloride ion corrosion model construction method in the above embodiment.

[0080] The method provided by the embodiment of the present invention uses a chloride ion erosion model to simulate the concentration change of chloride ions inside the concrete of the splash zone of an offshore concrete platform under wave impact. The model is constructed by multiple one-dimensional fractal derivative diffusion equations. Each wave cycle corresponds to a one-dimensional fractal derivative diffusion equation. In the one-dimensional fractal derivative diffusion equations corresponding to different wave impact cycles, the chloride ion concentration at the boundary and the fractal derivative order are different. Due to different wave conditions and wave impact cycles, the chloride ion concentration at the concrete boundary changes differently. Therefore, the embodiment of the present invention can more finely and accurately describe the concentration change of chloride ions in concrete through the chloride ion erosion model, reflect the chloride ion erosion process, and provide a basis for the maintenance of offshore concrete platforms.

[0081] In one example, the wave impact period is 96s, the sea surface humidity is 60%, and the seawater chloride ion concentration is 2.8g / l. Under this sea surface humidity and wave period, it is assumed that there is no attenuation of chloride ion concentration at the boundary, that is, the attenuation function is 1. At the same time, considering the saturated concrete condition, there is no convection process in solute migration, that is, the convection parameter is 0. Therefore, the chloride ion erosion model of the chloride ion erosion process in the concrete splash zone under this working condition is established as follows:

[0082]

[0083]

[0084]

[0085] According to the wave condition, the fractal derivative order of the model is determined to be α1=0.6, α2=0.75, α3=0.9, and the diffusion coefficient D is 23.4. For example, the finite difference method can be used to solve the model, and the simulation results of chloride ions are as follows: Figure 2 and Figure 3 shown.

[0086] Figure 3 is the change in chloride ion concentration at different locations inside the concrete from the outer surface at the final time of 288s. Figure 3 It can be seen that at the final moment of 288s, at a distance of 140mm from the outer surface of the concrete (at the boundary), the concentration of chloride ions inside the concrete was close to 1 / 6 of that on the outer surface, which was at a relatively high concentration level.

[0087] Figure 4The change of chloride ion concentration inside concrete with time at a distance of 122.5 mm from the outer surface. Figure 4 It can be seen from the figure that the rapid increase of chloride ion concentration inside the concrete occurs in the third cycle. Therefore, the concrete float should be treated with anti-corrosion before the end of the second cycle.

[0088] Based on the same inventive concept, the embodiment of the present invention also provides a chloride ion corrosion model construction device, such as Figure 5 As shown, the device comprises:

[0089] The first acquisition module 501 is used to obtain the wave impact cycle under each wave condition and the chloride ion concentration in the concrete splash zone of each wave impact cycle; for details, please refer to the description of step S101 in the above embodiment, which will not be repeated here.

[0090] The determination module 502 is used to determine the parameters in the one-dimensional fractal derivative diffusion equation corresponding to each wave impact period, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time based on the chloride ion concentration in the concrete splash zone of each wave impact period; for details, please refer to the description of step S102 in the above embodiment, which will not be repeated here.

[0091] Establishing module 503, for establishing a chloride ion erosion model based on the parameters in the one-dimensional fractal derivative diffusion equation, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time, the chloride ion erosion model is used to simulate the change of chloride ion concentration in the concrete splash zone under various wave conditions, and the chloride ion erosion model includes multiple one-dimensional fractal derivative diffusion equations, each of which corresponds to a wave impact cycle. For details, see the description of step S103 in the above embodiment, which will not be repeated here.

[0092] In one example, in the determination module 502, the functional relationship between the fractal derivative order and time is an increasing function, wherein the increasing coefficient in the increasing function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period. For details, please refer to the description in the above embodiment, which will not be repeated here.

[0093] In an optional embodiment, the functional relationship between the fractal derivative order and time in the determination module 502 is expressed as follows:

[0094] α m =1 / (2-μ(mT-T) / (T))α1

[0095] Among them, α mrepresents the fractal derivative order of the mth period, μ is the increasing coefficient, T is the wave impact period, and α1 represents the fractal derivative order of the first period. For details, please refer to the description in the above embodiment, which will not be repeated here.

[0096] In one example, in the determination module 502, the functional relationship between the chloride ion concentration at the boundary and the time is an attenuation function, wherein the attenuation coefficient in the attenuation function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period. For details, please refer to the description in the above embodiment, which will not be repeated here.

[0097] In an optional embodiment, the functional relationship between the chloride ion concentration at the boundary and the time in the determination module 502 is expressed as follows:

[0098] P(t)=1 / (1+β(t-T1)), T1 <t<T2

[0099] Wherein, P(t) represents the chloride ion concentration at the boundary at time t, β is the attenuation coefficient, T1 is the end time of the previous cycle, and T2 is the end time of the current cycle. For details, please refer to the description in the above embodiment, which will not be repeated here.

[0100] In yet another example, the chloride ion corrosion model in the building module 503 is expressed as follows:

[0101]

[0102] ...

[0104]

[0105] c(0,t)=CP(t)

[0106] in, is the fractal derivative; α m represents the fractal derivative order of the mth period; A is the convection parameter; D is the diffusion parameter; c is the concentration of chloride ions in concrete; t is time; x is the spatial position, and the direction is the surface normal direction; T is the wave impact period; P(t) is the chloride ion concentration at the boundary at time t. For details, please refer to the description in the above embodiment, which will not be repeated here.

[0107] Based on the same inventive concept, the embodiment of the present invention also provides a simulation device for chloride ion corrosion, such as Figure 6 As shown, the device comprises:

[0108] The second acquisition module 601 is used to acquire the current wave condition and wave impact period; for details, please refer to the description of step S201 in the above embodiment, which will not be repeated here.

[0109] The simulation module 602 is used to simulate the change of chloride ion concentration in the concrete splash zone based on the current wave condition, wave impact cycle and chloride ion erosion model, and the chloride ion erosion model is established by the chloride ion erosion model construction method in the above embodiment. For details, please refer to the description of step S202 in the above embodiment, which will not be repeated here.

[0110] The specific limitations and beneficial effects of the above-mentioned device can be found in the above-mentioned limitations on the chloride ion corrosion model construction method and the chloride ion corrosion simulation method, which will not be repeated here. The above-mentioned modules can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0111] Figure 7 FIG. 1 is a schematic diagram of a hardware structure of a computer device according to an exemplary embodiment. Figure 7 As shown, the device includes one or more processors 710 and a memory 720, and the memory 720 includes a persistent memory, a volatile memory, and a hard disk. Figure 7 A processor 710 is taken as an example. The device may also include: an input device 730 and an output device 740.

[0112] The processor 710, the memory 720, the input device 730 and the output device 740 may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0113] The processor 710 may be a central processing unit (CPU). The processor 710 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips. A general-purpose processor may be a microprocessor or the processor may be any conventional processor.

[0114] The memory 720, as a non-transient computer-readable storage medium, includes a persistent memory, a volatile memory, and a hard disk, and can be used to store non-transient software programs, non-transient computer executable programs, and modules, such as the program instructions / modules corresponding to the chloride ion corrosion model construction method and the chloride ion corrosion simulation method in the embodiment of the present application. The processor 710 executes various functional applications and data processing of the server by running the non-transient software programs, instructions, and modules stored in the memory 720, that is, realizing any of the above-mentioned chloride ion corrosion model construction methods and chloride ion corrosion simulation methods.

[0115] The memory 720 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data required for use, etc. In addition, the memory 720 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 720 may optionally include a memory remotely arranged relative to the processor 710, and these remote memories may be connected to the data processing device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0116] The input device 730 can receive input digital or character information and generate signal input related to user settings and function control. The output device 740 can include display devices such as display screens.

[0117] One or more modules are stored in the memory 720, and when executed by one or more processors 710, the execution is as follows: Figure 1 or Figure 2 The method shown.

[0118] The above-mentioned product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to Figure 1 or Figure 2 Related description of the illustrated embodiment.

[0119] The embodiment of the present invention also provides a non-transitory computer storage medium, which stores computer executable instructions, and the computer executable instructions can execute the construction and simulation methods in any of the above method embodiments. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (Flash Memory), a hard disk (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above types of memory.

[0120] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0121] The above is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method for constructing a chloride ion corrosion model, characterized in that: The method comprises: Obtain the wave impact cycle under each wave condition and the chloride ion concentration in the concrete splash zone at each wave impact cycle; Based on the chloride ion concentration in the concrete splash zone of each wave impact cycle, the parameters in the one-dimensional fractal derivative diffusion equation corresponding to each wave impact cycle, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time are determined respectively; Based on the parameters in the one-dimensional fractal derivative diffusion equation, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time, a chloride ion corrosion model is established. The chloride ion corrosion model is used to simulate the change of chloride ion concentration in the concrete splash zone under various wave conditions. The chloride ion corrosion model includes multiple one-dimensional fractal derivative diffusion equations, and each one-dimensional fractal derivative diffusion equation corresponds to a wave impact cycle. The chloride ion corrosion model is expressed as follows: ... c(0,t)=CP(t) in, is the fractal derivative, defined as α is the fractal derivative order, 0<α≤1, different subscripts represent different fractal derivative order values ​​of wave impact cycles; α m represents the fractal derivative order of the mth period; A is the convection parameter; D is the diffusion parameter; c is the concentration of chloride ions in concrete; t is time; x is the spatial position, 0 is the surface of the concrete splash zone, and the direction is the surface normal direction; T is the wave impact period; P(t) is the chloride ion concentration at the boundary at time t; The functional relationship between the fractal derivative order and time is expressed as follows: a m =1 / (2-μ(mT-T) / (T))α1 Among them, α m represents the order of the fractal derivative of the mth period, μ is the increasing coefficient, T is the wave impact period, and α1 represents the order of the fractal derivative of the first period; The functional relationship between the chloride ion concentration at the boundary and time is expressed as follows: P(t)=1 / (1+β(t-T1)), T1 <t<T2 Among them, P(t) represents the chloride ion concentration at the boundary at time t, β is the attenuation coefficient, T1 is the end time of the previous cycle, and T2 is the end time of this cycle.

2. The method according to claim 1, characterized in that The functional relationship between the fractal derivative order and time is an increasing function, wherein the increasing coefficient in the increasing function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period.

3. The method according to claim 1, characterized in that: The functional relationship between the chloride ion concentration at the boundary and time is an attenuation function, wherein the attenuation coefficient in the attenuation function is determined based on the chloride ion concentration in the concrete splash zone and the wave impact period.

4. A method for simulating chloride ion corrosion, characterized in that: The method comprises: Get the current wave conditions and wave impact period; Based on the current wave condition, wave impact cycle and chloride ion erosion model, the change of chloride ion concentration in the concrete splash zone is simulated, and the chloride ion erosion model is established by the chloride ion erosion model construction method described in any one of claims 1-3.

5. A chloride ion corrosion model construction device, characterized in that: The device comprises: The first acquisition module is used to obtain the wave impact cycle under each wave working condition and the chloride ion concentration in the concrete splash zone of each wave impact cycle; A determination module is used to determine the parameters in the one-dimensional fractal derivative diffusion equation corresponding to each wave impact cycle, the functional relationship between the fractal derivative order and time, and the functional relationship between the chloride ion concentration at the boundary and time based on the chloride ion concentration in the concrete splash zone of each wave impact cycle; Establishing a module for establishing a chloride ion erosion model based on parameters in a one-dimensional fractal derivative diffusion equation, a functional relationship between the fractal derivative order and time, and a functional relationship between the chloride ion concentration at the boundary and time, wherein the chloride ion erosion model is used to simulate the change in chloride ion concentration in the concrete splash zone under various wave conditions, and the chloride ion erosion model includes a plurality of one-dimensional fractal derivative diffusion equations, each of which corresponds to a wave impact cycle; The chloride ion corrosion model is expressed as follows: ... c(0,t)=CP(t) in, is the fractal derivative, defined as α is the fractal derivative order, 0<α≤1, different subscripts represent different fractal derivative order values ​​of wave impact cycles; α m represents the fractal derivative order of the mth period; A is the convection parameter; D is the diffusion parameter; c is the concentration of chloride ions in concrete; t is time; x is the spatial position, 0 is the surface of the concrete splash zone, and the direction is the surface normal direction; T is the wave impact period; P(t) is the chloride ion concentration at the boundary at time t; The functional relationship between the fractal derivative order and time is expressed as follows: a m =1 / (2-μ(mT-T) / (T))α1 Among them, α m represents the order of the fractal derivative of the mth period, μ is the increasing coefficient, T is the wave impact period, and α1 represents the order of the fractal derivative of the first period; The functional relationship between the chloride ion concentration at the boundary and time is expressed as follows: P(t)=1 / (1+β(t-T1)), T1 <t<T2 Among them, P(t) represents the chloride ion concentration at the boundary at time t, β is the attenuation coefficient, T1 is the end time of the previous cycle, and T2 is the end time of this cycle.

6. A simulation device for chloride ion corrosion, characterized in that: The device comprises: The second acquisition module is used to obtain the current wave conditions and wave impact period; A simulation module is used to simulate the change of chloride ion concentration in the concrete splash zone based on the current wave condition, wave impact cycle and chloride ion erosion model, wherein the chloride ion erosion model is established by the chloride ion erosion model construction method described in any one of claims 1 to 3.

7. A computer device, characterized in that: It comprises a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for constructing a chloride ion corrosion model according to any one of claims 1 to 3, or executes the steps of the method for simulating chloride ion corrosion according to claim 4 by executing the computer instructions.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for constructing a chloride ion corrosion model as described in any one of claims 1 to 3, or the steps of the method for simulating chloride ion corrosion as described in claim 4 are implemented.

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