KR102206445B1 - Method of Numerical Analysis for the design of Submerged Floating Tunnel - Google Patents

Abstract

The present invention provides a numerical analysis method for the design of an underwater tunnel, and more particularly, to a numerical analysis method for the cross-section design of a single circular underwater tunnel. According to an aspect of the present invention, the numerical analysis method for the design of an underwater tunnel comprises: a prior analysis step of determining a wave theory of a candidate site where the underwater tunnel is to be located, and determining a hydrodynamic related equation representing the relationship between the wave of the candidate site and the underwater tunnel; and a guideline generation step of generating a wave pressure distribution using the determined wave theory, the hydrodynamic related equation, and a wave load parameter at a specific time, and applying the generated wave pressure distribution to the detailed structure of the underwater tunnel to generate a guideline.

Description

Method of Numerical Analysis for the design of Submerged Floating Tunnel

The present invention relates to a numerical analysis method for designing an underwater tunnel, and more specifically, to a numerical analysis method for designing a cross section of a single circular underwater tunnel.

Submerged Floating Tunnel (SFT) is an infrastructure that was only introduced conceptually in 1886, and is a structure that can significantly reduce the excessive civil engineering costs of offshore and submarine tunnels.

However, there is no reliability in the safety and stability of the structure, and the structure that has existed theoretically for more than 140 years due to the very high construction difficulty has recently emerged as the need for development of construction technology and marine resources and territorial development has emerged. Leading research centers have been established in many countries around the world (Japan, China, Norway, etc.), and related research is actively being conducted.

Since there are no cases of realization of the SFT structure itself, there are almost no patents related to this, but unlike the ground, the magnitude and direction of the load changes from time to time, and due to the nature of the underwater structure, which interacts with the structure very large, numerical analysis for cross-sectional design We need a new approach to

The design and analysis cases of special structures installed in the water have been concentrated on the water (offshore wind power generation, tension leg platform, etc.) and the seabed (submarine tunnel, optical communication network, etc.), and structures located underwater (middle of the sea) are these. And have different characteristics.

Structure design through numerical analysis is mainly divided into dynamic analysis and static analysis.

In the case of dynamic analysis, a very simple element, for example, a beam element, a truss element, etc., is used to see the effect over time, and the change in the magnitude and distribution of the load over time, You can check the interaction with the structure and the effect of resonance.

In the case of static analysis, an element with high degrees of freedom, for example, a solid element, is used to apply a fixed load, a three-dimensional structure response and a detailed cross-sectional design accordingly, and an easy parameter study such as changes in the internal structure. There is an advantage that it is possible.

In the case of offshore structures in which the characteristics of the input load are important, analysis and design are mainly conducted based on dynamic analysis.In the case of dynamic analysis, the response of the structure according to the load is the longitudinal direction, which is the X direction in FIG. Since it appears only as and the position within the cross section is not known, there is a disadvantage in that the longitudinal members are arranged in the same manner as a whole, and the transverse direction is also arranged in the same manner, or a higher load factor is applied, resulting in an inefficient design.

In the case of static analysis, there is a disadvantage in that it is not possible to apply the varying size and distribution of loads, which are important in dynamic analysis, and that interaction with structures and resonance characteristics cannot be confirmed.

In addition, when modeling a large-scale structure through solid elements used in static analysis, hundreds of thousands to millions of elements are required, and in the case of flow analysis (CFD) or dynamic analysis, the structure takes 10 seconds. In order to see the response, a general analysis workstation requires about a week of analysis, and the efficiency and cost are very negative.

Conventional Patent Document 1 (KR10-1529091 B1) relates to an underwater tunnel and its construction method, and describes a general methodology for the construction of an underwater tunnel, and is closer to a construction technology aspect than a numerical analysis. In addition, it is distinguished from the present invention because it has very similar aspects to the patents related to general offshore bridges (dock formation method, pier installation, etc.). In addition, Patent Document 1 has no detailed description of a cross section.

Conventional Non-Patent Document 1 (Design of Offshore Concrete Structure Based on Postprocessing of Results from Finiete Element Analysis (FEA): Methods, Limitations and Accuracy, Proceedings of the Fourth (1994) International Offshore and Polar Engineering Conference, 1994) is a solid element Although static analysis (finite element analysis) is in progress, the target structure is limited to offshore structures (Tension leg platform, etc.), and evaluation of the structure is possible only through'Postprocessing', that is, a relatively complex post-processing process. There are drawbacks.

In addition, Non-Patent Literature 1 is a paper in 1994, and it can be seen that as the numerical analysis technique has been greatly developed since then, its utilization in structure design has increased compared to the previous one. Therefore, it is considered that the cross-sectional design and decision-making of structures that are remarkably advanced compared to the existing ones can be made through the application of the analysis method proposed in the present invention. In addition, since the design method for a new structure called SFT is extremely rare, the present invention is differentiated from the existing research results.

As has been the case for the design of existing infrastructure such as SFT, construction of offshore bridges and highways is a project in which the cost exceeds trillions. The safety of the design and reliability of the result are the most prioritized in designing such a project. In addition, it is required to facilitate access to the design of infrastructure such as SFT by reducing trial and error.

KR 10-1529091 B1

Design of Offshore Concrete Structure Based on Postprocessing of Results from Finiete Element Analysis (FEA): Methods, Limitations and Accuracy, Proceedings of the Fourth (1994) International Offshore and Polar Engineering Conference, 1994

The problem to be solved by the present invention is to provide a numerical analysis method for designing an underwater tunnel, which can provide a design guideline for an underwater tunnel.

In addition, it provides a numerical analysis method for the design of an underwater tunnel that can reduce the existing high design cost and induce efficient decision making during SFT construction.

In addition, it provides a numerical analysis method for the design of an underwater tunnel with the safety of SFT design and the reliability of the result.

In addition, it provides a numerical analysis method for the design of an underwater tunnel that can facilitate access to the SFT design by reducing trial and error in the design of the SFT.

A numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention is a numerical analysis method performed in a numerical analysis device for designing an underwater tunnel, wherein the preceding analysis unit determines the wave theory of a candidate site for the underwater tunnel. , Determining an equation related to hydrodynamics indicating a relationship between the wave of the candidate site and the underwater tunnel; And a guideline generator generating a static wave pressure distribution using the wave theory determined in the preceding analysis step, the fluid mechanics-related equation, and a wave load parameter at a specific point in time, and the generated static wave pressure distribution. A guideline generation step of generating a guideline by applying to the detailed structure of the underwater tunnel; wherein the specific time point is a time point at which the blue was highest during a certain period in the past at the candidate site, and in the guideline generation step, The static wave pressure distribution is generated using an equivalent static load concept, and the equivalent static load concept is based on the determined wave theory and the fluid mechanics-related equation, using a predetermined analysis tool And converted into the static wave pressure value.

Here, the preceding analysis step includes: a candidate site parameter selection step in which a candidate site parameter of the candidate site is selected; A preselection step of the main parameters of the underwater tunnel in which the main parameters for the design of the underwater tunnel are preselected; Determining a wave theory corresponding to a relative depth value and a wave steepness value in the wave theory determination graph; And determining an equation related to fluid mechanics corresponding to a Keulegan-Carpenter number and a dimension by wavelength value in the fluid mechanics related equation determination graph. I can.

Here, the candidate site parameter may include a Significant Wave Height, a Significant Wave Period, a Mean Water Depth, and a wavelength of a blue wave.

Here, the main parameters may include an outer diameter of the underwater tunnel, an outer thickness of the underwater tunnel, and a span length of the underwater tunnel.

Here, the fluid mechanics-related equation may be a Morrison equation.

Here, the wave load parameter may include a Significant Wave Height, a Significant Wave Period, and an immersion depth of the underwater tunnel at the specific time point.

Here, the detailed structure of the underwater tunnel may include an outer diameter (D), an outer thickness (t) and D/t, which are detailed parameters of the underwater tunnel.

Here, the guideline may include a stress value applied to the underwater tunnel for each of the wave load parameter and the detailed parameter of the underwater tunnel.

Here, the predetermined tool may be a Hydrogen analysis tool.

A computer-readable recording medium having a computer program recorded thereon according to another embodiment of the present invention is for performing a numerical analysis method for designing an underwater tunnel described above.

When the numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention is used, there is an advantage of providing a design guideline for an underwater tunnel.

In addition, there is an advantage of reducing the existing high design cost and inducing efficient decision-making during SFT construction.

In addition, there is an advantage of having the safety of the SFT design and the reliability of the result.

In addition, there is an advantage in that the SFT design can be easily accessed by reducing trial and error in the design of the SFT.

1 is a simulation diagram obtained by performing a global analysis of SFT using a conventional dynamic analysis.
2 is a flowchart illustrating a numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention.
3 is a flow chart for explaining in detail the preceding analysis step (S100) of the numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention shown in FIG. 2.
FIG. 4 is a graph for explaining the wave theory determination step S330 shown in FIG. 3.
5 is a diagram for explaining the linear wave theory.
6 is a graph for explaining the determination step (S140) related to the fluid mechanics equation shown in FIG.
FIG. 7 is a flow chart for explaining in detail the step of creating a guideline (S300) shown in FIG. 2.
8 is a diagram showing an example of a wave pressure distribution map.
FIG. 9A is a diagram showing an example of a detailed structure of an SFT, and FIG. 9B is a table for explaining a BWR.
10A and 10B are graphs for explaining an example of a guideline.

For detailed description of the present invention to be described later, reference is made to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced as an example. These embodiments are described in detail enough to enable those skilled in the art to practice the present invention. It is to be understood that the various embodiments of the present invention are different from each other but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention with respect to one embodiment. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, may be limited only by the appended claims, along with all scopes equivalent to those claimed by the claims. Like reference numerals in the drawings may refer to the same or similar functions over several aspects.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those of ordinary skill in the art to easily implement the present invention.

2 is a flowchart illustrating a numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention.

Referring to FIG. 2, a numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention may include a preceding analysis step (S100) and a guideline generation step (S300) for performing numerical analysis.

In the preceding analysis step (S100) for performing numerical analysis, the preceding analysis unit determines the wave theory (or wave equation) of the candidate site where the SFT is to be located, and determines a fluid mechanics-related equation indicating the relationship between the wave of the candidate site and the SFT. .

In the guideline generation step (S300), the guideline generator generates a wave pressure distribution by using the wave theory and the fluid mechanics-related equation determined in the preceding analysis step (S100), and the wave load parameter at a specific point in time. A guideline is created by applying the wave pressure distribution to the detailed structure of the SFT.

Hereinafter, the preceding analysis step (S100) and the guideline generation step (S300) will be described in detail with reference to the accompanying drawings.

3 is a flow chart for explaining in detail the preceding analysis step (S100) of the numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention shown in FIG. 2.

Referring to Figure 3, the preceding analysis step (S100) shown in Figure 2, the candidate site parameter selection step (S110), SFT main parameter preselection step (S120), wave theory (wave theory) determination step (S130), and And determining a hydrodynamic-related equation (S140).

The candidate site parameter selection step (S110) is a step in which a candidate site parameter of a candidate site in which an underwater tunnel (SFT) is located is selected or determined. The candidate site parameter may include H _S , T _P , h and λ. Here, H _S is the Significant Wave Height, T _P is the Significant Wave Period, h is the Mean Water Depth, and λ is the wavelength of the wave. The candidate site parameters are different for each candidate site. Thus, when the candidate site is determined, the candidate site parameter is determined.

The SFT main parameter preselection step (S120) is a step in which the main parameters for SFT design are preselected. SFT main parameters may include D, t and L. Here, D is the outer diameter of the underwater tunnel (SFT), t is the outer thickness of the SFT, and L is the span length of the SFT. The main parameter of the SFT is a value provided by the designer.

A wave theory determination step S330 is a step of determining a wave theory applied to a candidate site. This will be described with reference to FIG. 4.

FIG. 4 is a graph for explaining the wave theory determination step S330 shown in FIG. 3.

The wave theory determination graph of FIG. 4 shows that the wave theory is determined by the values of the horizontal axis and the vertical axis. In the graph of FIG. 4, the horizontal axis represents the relative depth and is determined as'h/gT _p ² '. The vertical axis is Wave steepness, which is determined as'H _s /gT _p ² '. Where g is the acceleration due to gravity.

In step S110 of FIG. 3, since H _S , T _P and h values are determined, the relative depth value and the wave slope value are determined. The determined wave theory is based on a wave theory corresponding to a position to which the determined relative depth value and the determined wave slope value are mapped in the graph of FIG. 4.

For example, as shown in FIG. 3, if H _s is 11.7 (m), T _P is 13 (s), and h is 100 (m), the relative depth value is approximately 0.05, and the blue slope value is approximately Since it is 0.0002, the wave theory to be judged becomes linear wave theory.

Furthermore, there are many things in the linear wave theory. As shown in Figure 5, linear wave theory according to the shape of the wave, Airy Wave Theory (Airy Wave Theory), Stokes Wave Theory (Stokes Wave Theory), Knoidal Wave Theory (Cnoidal Wave Theory), and Solitaire Wave Theory. (Solitary Wave Theory). Airy's wave theory is representative of the linear wave theory.

Again, referring to FIG. 3, the determining step S140 of a hydrodynamic-related equation is a step of determining one hydrodynamic-related equation from among a plurality of hydrodynamic-related equations. This will be described with reference to FIG. 6.

6 is a graph for explaining the determination step (S140) related to the fluid mechanics equation shown in FIG.

H_S/3 이다. The fluid mechanics-related equation determination graph of FIG. 6 shows that the fluid mechanics-related equation is determined by the values of the horizontal axis and the vertical axis. In the graph of FIG. 6, the horizontal axis is'K _C =π*Hs/D' and the vertical axis is'D/λ'. Where K _C is the Keulegan-Carpenter number, and D/λ is the dimension by wavelength, and H

H _S /3.

In the fluid mechanics-related equation determination graph of FIG. 6, there are equations related to fluid mechanics corresponding to each section (I, Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ). Most underwater structures such as SFT become Morrison's equation, which corresponds to the large inertia of III.

Also in FIG. 6, if H _s is 11.7 (m), D is 23 (m), and λ is 212 (m), the fluid dynamics-related equation to be determined is in the large inertia of III. Exists, and thus Morison's equation is determined.

FIG. 7 is a flow chart for explaining in detail the step of creating a guideline (S300) shown in FIG. 2.

Referring to FIG. 7, the step 310 of determining a wave pressure distribution includes the wave theory determined in FIG. 3, a hydrodynamic-related equation, and a wave load parameter ( Wave Load Parameter) can be used to obtain the wave pressure distribution. In other words, the wave pressure distribution can be obtained by using the concept of equivalent static load. Here, the concept of equivalent static load is based on the previously determined wave theory and equations related to fluid mechanics, and is a critical value in dynamic analysis. This could mean pulling the load parameters and converting them into static wave pressure values through an analysis tool like Hydrogen.

The wave load parameter includes H _S , T _P and Z _S at a specific time point, and the specific time point may be, for example, a time point at which the wave was highest during a certain period in the past at the candidate site. As a specific example, H _S , T _P, and Z _S at a point in time when the wave was greatest for 100 years in the candidate site may be determined as wave load parameters. The H _S , T _P and Z _S are determined according to the designer's input. On the other hand, H _S is the Significant Wave Height, T _P is the Significant Wave Period, and Z _S is the Submergence Depth of the SFT.

The generated wave pressure distribution may output a wave pressure value for each position of the SFT, and may be output as a wave pressure distribution diagram, as shown in FIG. 8.

An example of the wave pressure distribution diagram shown in FIG. 8 is that the wave theory is a linear wave theory (more specifically, Airy wave theory), and the fluid mechanics-related equation is determined by the Morrison equation. And, in order to obtain the wave pressure distribution map, an analysis tool called'Hydrogen' was used. When the linear wave theory (more specifically, Airy wave theory) and the fluid mechanics-related equation apply the Morrison equation and the wave load parameter to the analysis tool called'Hydrogen', a wave pressure distribution diagram as shown in FIG. 8 can be obtained.

Referring to FIG. 8, a wave pressure distribution in a circumferential direction of an SFT designed at a specific depth of a specific candidate site can be confirmed.

The wave load parameter may be set in plural according to the designer. Therefore, it is possible to obtain a wave pressure distribution corresponding to each of the plurality of wave load parameters set. For example, a first wave pressure distribution corresponding to the first wave load parameter, ..., an nth wave pressure distribution corresponding to the nth wave load parameter may be obtained.

Again, referring to FIG. 7, the detailed design step S320 of the SFT is a step of setting detailed parameters D, t, and D/t of the SFT. Here, D is the outer diameter of the underwater tunnel (SFT), and t is the outer thickness of the SFT. D and t values can be determined by the designer.

When the D value is determined, a live load based on the number of roads or rails can be calculated. Referring to (a) of FIG. 9, when the determined D value is at least 20 (m) or more, a highway and a railroad are included in the SFT to be designed.

When the t value is determined, a Buoyancy-Weight Ratio (BWR) may be calculated. Referring to (b) of FIG. 9, it can be seen that BWR values according to the determined D and t values are shown in a table.

The application step (S330) of the equivalent static wave pressure is a step of applying the wave pressure distribution determined in step S310 to the SFT designed in step S320. For this, a tool called ABAQUS can be used. When the wave pressure distribution determined in step S310 and the SFT designed in step S320 are input to the tool, a guideline may be output.

The output guideline may include an effect on the SFT for each parameter (H _S , T _P , Z _S , D, t or H _S , T _P , Z _S , D/t) set in steps S310 and S320. . For example, as shown in FIG. 10, the guideline may include a maximum compressive stress value and a maximum shear stress value according to t for each D value.

In addition, the guideline may include a generalized equation such as <Equation 1> below.

In addition, the guideline may include a detailed evaluation of stress applied in the circumferential direction in the cross section of the SFT. The guideline may include stress evaluation according to a ratio of D/t.

The numerical analysis method for designing an underwater tunnel according to the embodiment of the present invention can provide a guideline to a designer in designing an underwater tunnel (SFT) to be located in a specific candidate location.

The numerical analysis method for the design of the underwater tunnel according to the embodiment of the present invention is based on static analysis in order to perform detailed analysis of the cross section, and converts dynamic loads into'equivalent static loads' having the same size and distribution. It is meaningful that it was introduced into interpretation. At this time, it is necessary to consider the varying size and distribution of the loads considered in the dynamic analysis, and the interaction with the structure, and when designing the structure, only the largest critical load in the dynamic load progressing along the time axis needs to be considered. There is an advantage of greatly reducing the number of.

In addition, since the theoretical value (accurate value) and the comparison between various analysis tools (Dynamic analysis, OrcaFlex / Static analysis, ABAQUS) are based, the numerical analysis method for the underwater tunnel design according to the embodiment of the present invention Reliability has a high advantage.

In addition, since the concept of'equivalent static load' is applied and many processes performed in dynamic analysis are considered together during the analysis process, there is an advantage that it is possible to design the cross section of the SFT through relatively simple post-processing. In particular, it is expected that the utilization and necessity of the SFT will increase in the future by constructing an initial level of SFT in a deep river, not the sea like China.

In addition, when the verification cost is reduced due to the accumulation of design cases, the design cost can also be greatly reduced. In particular, when the development of global maritime territories is progressed according to the development of human construction technology, the design cost reduction and technology export effect according to the present invention are expected to be very large.

In addition, unlike dynamic analysis in which the response (section force, stress, etc.) of SFT cannot be seen, its size and detailed location are known, so it is possible to arrange the reinforcing members in the cross section according to the need, thereby reducing waste and greatly reducing material cost. There is an advantage to be able to.

In addition, unlike the existing method, which requires dynamic analysis by recalculating rotational stiffness and axial stiffness every time the internal structure of a section changes, basic analysis in a large frame (the overall size of the structure, After the shape, etc.) is completed, parameter analysis and design are possible while changing the internal structure of the cross-section as much as possible, thereby increasing design efficiency.

In addition, with the introduction of the concept of'equivalent static load', the load factor (e.g., static load is 1, wind load is 1.3, etc.) proposed in the existing design regulations (Korean road bridge design standards, Eurocode 3, CEB-FIP, etc.) The seismic load is multiplied by 1.5, etc., and by combining them, it is possible to design according to the design method according to importance and probability).

The numerical analysis method for designing an underwater tunnel according to an embodiment of the present invention may be implemented through a computer-readable recording medium including program instructions for performing computer-implemented operations. The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination. The recording medium may be specially designed and configured for the embodiment, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical recording media such as CD-ROMs and DVDs, magnetic-optical media such as floptic disks, and ROM, RAM, and flash memory. Hardware devices specially configured to store and execute program instructions are included. Examples of program instructions include not only machine language codes such as those produced by a compiler but also high-level language codes that can be executed by a computer using an interpreter or the like.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but these are only examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention pertains will not depart from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications not illustrated above are possible in the range. For example, each constituent element specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (11)

In the numerical analysis method performed in a numerical analysis device for the design of an underwater tunnel,
A preceding analysis step of determining, by a preceding analysis unit, a wave theory of a candidate site where the underwater tunnel is to be located, and determining an equation related to fluid mechanics indicating a relationship between the wave of the candidate site and the underwater tunnel; And
The guideline generation unit generates a static wave pressure distribution using the wave theory determined in the preceding analysis step, the fluid mechanics-related equation, and a wave load parameter at a specific time point, and the generated static wave pressure distribution A guideline generation step of generating a guideline by applying it to the detailed structure of the tunnel;
Including,
The specific time point is the time point in which the blue was highest during a certain period in the past in the candidate site,
In the guideline generation step, the static wave pressure distribution is generated using an equivalent static load concept,
The equivalent static load concept converts the determined wave load parameter into the static wave pressure value using a predetermined analysis tool based on the determined wave theory and the fluid mechanics-related equation,
Numerical analysis method for the design of underwater tunnels. The method of claim 1, wherein the preceding analysis step,
A candidate site parameter selection step of selecting a candidate site parameter of the candidate site;
A preselection step of the main parameters of the underwater tunnel in which the main parameters for the design of the underwater tunnel are preselected;
Determining a wave theory corresponding to a relative depth value and a wave steepness value in the wave theory determination graph; And
Determining an equation related to hydrodynamics corresponding to a Keulegan-Carpenter number and a dimension by wavelength value in the graph for determining an equation related to hydrodynamics;
Including, a numerical analysis method for the design of an underwater tunnel. The method of claim 2,
The candidate site parameter includes a Significant Wave Height, Significant Wave Period, Mean Water Depth, and Wave Wavelength, a numerical analysis method for designing an underwater tunnel. The method of claim 2,
The main parameters, including the outer diameter of the underwater tunnel (Outer Diameter), the outer thickness of the underwater tunnel (Outer Thickness) and the span length (Span Length) of the underwater tunnel, a numerical analysis method for designing an underwater tunnel. The method of claim 2,
The wave theory includes a linear wave theory,
The linear wave theory includes Airy Wave Theory, Stokes Wave Theory, Cnoidal Wave Theory, and Solitary Wave Theory. Numerical analysis method for design. The method of claim 2,
The fluid mechanics-related equation is the Morrison equation, a numerical analysis method for the design of an underwater tunnel. The method of claim 1,
The wave load parameter includes a Significant Wave Height, a Significant Wave Period, and an immersion depth of the underwater tunnel at the specific point in time, a numerical analysis method for designing an underwater tunnel. The method of claim 1,
The detailed structure of the underwater tunnel includes an outer diameter (D), an outer thickness (t) and D/t, which are detailed parameters of the underwater tunnel, and a numerical analysis method for designing an underwater tunnel. The method of claim 1,
The guideline includes a stress value applied to the underwater tunnel according to the wave load parameter and the detailed parameter of the underwater tunnel, a numerical analysis method for designing an underwater tunnel. The method of claim 1,
The predetermined analysis tool is a Hydrogen analysis tool, a numerical analysis method for designing an underwater tunnel. A computer-readable recording medium having a computer program recorded thereon for performing a numerical analysis method for designing an underwater tunnel according to any one of claims 1 to 10.

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