Method, system and equipment for checking stress of one-way immersed tube trench-entering pipeline and storage medium

Abstract

The invention relates to the technical field of pipeline construction, and particularly discloses a one-way immersed tube trenching pipeline stress checking method, system and device and a storage medium, and the method comprises the steps: determining a first stress checking correlation parameter of a one-way immersed tube trenching pipeline and a first evaluation coefficient used for checking the stress of the one-way immersed tube trenching pipeline based on an analytical calculation mode, based on the numerical simulation mode, determining a second stress checking correlation parameter of the one-way immersed tube trench pipeline and a second evaluation coefficient used for checking the stress of the one-way immersed tube trench pipeline; and according to the first stress checking correlation parameter, the second stress checking correlation parameter, the first evaluation coefficient and the second evaluation coefficient, calculating a stress checking relative error, and according to the stress checking relative error, the first evaluation coefficient and the second evaluation coefficient, judging whether the one-way immersed tube lower trench pipeline passes stress checking or not. According to the method, the problem that the accuracy of the checking result is difficult to verify when stress checking is carried out by a single method is solved, and the stress checking precision is improved.

Description

Background Art

[0002] When long-distance oil and gas pipelines pass through areas with poor foundation bearing capacity such as water networks, deserts, and swamps, the construction technology of sinking pipes in trenches is usually adopted. Compared with hoisting trenching, sinking pipe trenching has the characteristics of less organizational difficulty, less temporary occupation, and simple operation. It has been applied in large-scale pipeline engineering projects at home and abroad. According to the definition of sinking pipe trenching in Q / SY GDJ 0387-2014 "Construction Specifications for Sinking Pipe Trenching of Oil and Gas Transmission Pipelines", sinking pipe trenching refers to "a construction method in which a trench is excavated along one or both sides of the pipeline, and the pipeline is slowly sunk naturally into the trench by the action of its own gravity". Obviously, the source of power for sinking pipe trenching is deadweight, so this method is particularly suitable for laying trenches for large-diameter pipelines (with deadweight advantages). However, at the same time, the abnormal characteristics of large deadweight and poor foundation bearing capacity during the sinking process also make it very easy for large-diameter pipelines to cause greater stress and deformation during the trenching process, which seriously threatens pipeline safety. Based on this, it is of great significance to carry out stress verification of the pipeline in the immersed tube trench in view of the problems faced by the immersed tube trench, such as the heavy weight of the pipeline and the poor bearing capacity of the foundation.

[0003] At present, some scholars have achieved specific results in the field of immersed pipe trenching, such as a large-diameter, long-distance, multi-tube, same-ditch immersed pipe construction method (CN201711330230.4), an auxiliary immersed pipe device for immersed pipe trenching construction (CN202220472493.9), and a method, device, equipment and storage medium for stress verification of oil and gas pipeline immersed pipe construction (CN202211307787.7). However, the first two patents mentioned above mainly formed a construction method and a construction device around the immersed pipe trenching, and have no direct relationship with the stress verification of the one-way immersed pipe trenching pipeline; the last patent mentioned above includes a method for verifying the stress of the immersed pipe trenching pipeline, but it still has some shortcomings: First, it is only verified by a "single" finite element method, lacking a theoretical method to verify the reliability of the finite element verification results, and does not involve the idea of ​​"cooperative verification of analytical calculation and numerical simulation". Second, although the patent updates soil parameters by comparing with the historical measured maximum stress values ​​of oil and gas pipelines, the soil parameters include elastic modulus, Poisson's ratio, internal friction angle, cohesion, expansion angle, plastic strain, pipe-soil friction coefficient, etc. The patent does not clearly state which parameters are specifically updated in the finite element model, which is the core issue of pipeline stress verification using the finite element method.

[0004] Therefore, it is urgent to provide a technical solution to solve the above problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method, system, equipment and storage medium for checking the stress of a one-way immersed tube trench pipeline.

[0006] In a first aspect, the present invention provides a method for checking the stress of a one-way immersed pipe trench. The technical solution of the method is as follows:

[0007] Based on an analytical calculation method, a first stress verification associated parameter of a one-way immersed pipe trench pipe and a first evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipe are determined, and based on a numerical simulation method, a second stress verification associated parameter of the one-way immersed pipe trench pipe and a second evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipe are determined;

[0008] According to the first stress check associated parameter, the second stress check associated parameter, the first evaluation coefficient and the second evaluation coefficient, the stress check relative error of the one-way immersed tube lower trench pipeline is calculated, and according to the stress check relative error, the first evaluation coefficient and the second evaluation coefficient, it is determined whether the one-way immersed tube lower trench pipeline passes the stress check.

[0009] The beneficial effects of the one-way immersed pipe trench pipeline stress verification method of the present invention are as follows:

[0010] The method of the present invention solves the problem that it is difficult to verify the accuracy of the stress check result when a single method is used for stress check, and improves the accuracy of the stress check of the unidirectional immersed tube trench pipeline.

[0011] On the basis of the above scheme, the stress verification method of a one-way immersed tube trench pipeline of the present invention can also be improved as follows.

[0012] In an optional manner, the first stress verification associated parameters include: the length of the first arched section, the length of the first suspended section, the first soil compression displacement, and the bending moment borne by the pipeline at the end of the first trench excavation; the second stress verification associated parameters include: the length of the second arched section, the length of the second suspended section, the second soil compression displacement, and the bending moment borne by the pipeline at the end of the second trench excavation.

[0013] In an optional manner, the stress check relative error includes: a first stress check relative error and a second stress check relative error; and the step of calculating the stress check relative error of the one-way immersed pipe trench pipeline according to the first stress check associated parameter, the second stress check associated parameter, the first evaluation coefficient and the second evaluation coefficient includes:

[0014] Based on a first preset formula, the first arched section length, the first suspended section length, the first soil compression displacement, the bending moment borne by the pipeline at the first trench excavation end, the second arched section length, the second suspended section length, the second soil compression displacement and the bending moment borne by the pipeline at the second trench excavation end are calculated to obtain the first stress verification relative error;

[0015] The second stress verification relative error is obtained by performing calculation based on a second preset formula in combination with the first evaluation coefficient and the second evaluation coefficient.

[0016] In an optional manner, the step of determining whether the one-way immersed pipe trench pipeline passes the stress check according to the stress check relative error, the first evaluation coefficient and the second evaluation coefficient includes:

[0017] When both the first evaluation coefficient and the second evaluation coefficient are not greater than a first preset value, and when both the first stress check relative error and the second stress check relative error are not greater than a second preset value, it is determined that the one-way immersed pipe trench pipeline passes the coordinated stress check; wherein the coordinated stress check is performed by using analytical calculation and numerical simulation;

[0018] When both the first evaluation coefficient and the second evaluation coefficient are not greater than the first preset value, and when the first stress check relative error or the second stress check relative error is greater than the second preset value, it is determined that the one-way immersed pipe trench pipeline passes the single stress check; the single stress check method is: stress check by analytical calculation or numerical simulation;

[0019] When the first evaluation coefficient or the second evaluation coefficient is greater than the first preset value, it is determined that the one-way immersed tube trench pipeline has failed the stress check.

[0020] In an optional manner, based on an analytical calculation method, the step of determining a first stress verification associated parameter of a one-way immersed pipe and a first evaluation coefficient for verifying the stress of the one-way immersed pipe comprises:

[0021] Establish a stress analysis model for one-way immersed pipe trench pipeline;

[0022] According to the one-way immersed pipe trench pipeline stress analysis model, the first arched section length, the first suspended section length, the first soil compression displacement and the bending moment of the pipeline at the first trench excavation end of the one-way immersed pipe trench pipeline are calculated, and the maximum bending stress of the one-way immersed pipe trench pipeline is obtained;

[0023] Based on the fourth strength theory and in combination with the maximum bending stress, the first evaluation coefficient is calculated.

[0024] In an optional manner, based on a numerical simulation method, the step of determining the second stress verification associated parameter of the one-way immersed pipe and the second evaluation coefficient for verifying the stress of the one-way immersed pipe comprises:

[0025] Establishing a geometric model of the one-way immersed pipe trench pipeline and setting simulation conditions;

[0026] The sinking process of the one-way immersed pipe in the trench is simulated based on the statics solution type, and when the one-way immersed pipe in the trench touches the trench bottom, the second arched section length, the second suspended section length, the second soil compression displacement, the bending moment borne by the pipe at the excavation end of the second trench, and the principal stress of the pipe are output;

[0027] Based on the fourth strength theory and in combination with the pipeline principal stress, the second evaluation coefficient is calculated.

[0028] In a second aspect, the present invention provides a one-way immersed pipe trench pipeline stress verification system, the technical solution of the system is as follows:

[0029] Including: processing module and verification module;

[0030] The processing module is used to: determine the first stress verification associated parameter of the one-way immersed pipe trench pipeline and the first evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipeline based on an analytical calculation method, and determine the second stress verification associated parameter of the one-way immersed pipe trench pipeline and the second evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipeline based on a numerical simulation method;

[0031] The verification module is used to calculate the stress verification relative error of the one-way immersed tube trench pipeline according to the first stress verification associated parameter, the second stress verification associated parameter, the first evaluation coefficient and the second evaluation coefficient, and determine whether the one-way immersed tube trench pipeline passes the stress verification according to the stress verification relative error, the first evaluation coefficient and the second evaluation coefficient.

[0032] The beneficial effects of the one-way immersed pipe trench pipeline stress verification system of the present invention are as follows:

[0033] The system of the present invention solves the problem that it is difficult to verify the accuracy of the stress check result when a single method is used for stress check, and improves the accuracy of the stress check of the pipeline in the trench of a one-way immersed tube.

[0034] On the basis of the above scheme, the one-way immersed tube trench pipeline stress verification system of the present invention can also be improved as follows.

[0035] In an optional manner, the first stress verification associated parameters include: the length of the first arched section, the length of the first suspended section, the first soil compression displacement, and the bending moment borne by the pipeline at the end of the first trench excavation; the second stress verification associated parameters include: the length of the second arched section, the length of the second suspended section, the second soil compression displacement, and the bending moment borne by the pipeline at the end of the second trench excavation.

[0036] In a third aspect, a technical solution of an electronic device of the present invention is as follows:

[0037] The invention comprises a memory, a processor and a program stored in the memory and running on the processor. When the processor executes the program, the steps of the one-way immersed pipe trench pipeline stress verification method of the present invention are realized.

[0038] In a fourth aspect, the present invention provides a computer-readable storage medium having the following technical solution:

[0039] Instructions are stored in the computer-readable storage medium. When the computer-readable storage medium reads the instructions, the computer-readable storage medium executes the steps of the one-way immersed pipe trench pipeline stress verification method of the present invention.

[0040] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0042] Figure 1 It is a schematic flow chart of an embodiment of a method for checking stress of a one-way immersed pipe trench pipeline of the present invention;

[0043] Figure 2 It is a schematic diagram of the stress analysis model of the one-way immersed pipe trench pipeline;

[0044] Figure 3 Schematic diagram of constraints and mesh generation in numerical simulation;

[0045] Figure 4 It is a structural schematic diagram of an embodiment of a one-way immersed pipe trench pipeline stress check system of the present invention;

[0046] Figure 5 The figure is a schematic structural diagram of an embodiment of an electronic device of the present invention. DETAILED DESCRIPTION

[0047] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0048] Figure 1A flow chart of an embodiment of a one-way immersed tube trench pipeline stress verification method provided by the present invention is shown. The one-way immersed tube trench pipeline stress verification method can be executed by an electronic device such as a terminal device or a server. The terminal device can be any fixed or mobile terminal such as a user equipment (UE), a mobile device, a user terminal, a terminal, a cellular phone, a cordless phone, a personal digital assistant (PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, etc. The server can be a single server or a server cluster composed of multiple servers. Any electronic device can implement the one-way immersed tube trench pipeline stress verification method by means of a processor calling computer-readable instructions stored in a memory. Figure 1 As shown, the following steps are included:

[0049] S1. Based on an analytical calculation method, determine the first stress verification associated parameters of the one-way immersed tube trench pipeline and the first evaluation coefficient for verifying the stress of the one-way immersed tube trench pipeline, and based on a numerical simulation method, determine the second stress verification associated parameters of the one-way immersed tube trench pipeline and the second evaluation coefficient for verifying the stress of the one-way immersed tube trench pipeline.

[0050] The first stress check associated parameters include: the length of the first arched section L1, the length of the first suspended section L2, the first soil compression displacement Δ, and the bending moment M of the pipeline at the end of the first trench excavation. max The second stress check associated parameters include: the second arch section length L1′, the second suspended section length L2′, the second soil compression displacement Δ′ and the bending moment M′ of the pipeline at the end of the second trench excavation max .

[0051] S2. Calculate the stress verification relative error of the one-way immersed tube trench pipeline according to the first stress verification associated parameter, the second stress verification associated parameter, the first evaluation coefficient and the second evaluation coefficient, and determine whether the one-way immersed tube trench pipeline passes the stress verification according to the stress verification relative error, the first evaluation coefficient and the second evaluation coefficient.

[0052] The stress check relative error includes: a first stress check relative error δ and a second stress check relative error δ′. In S2, specifically:

[0053] 1) The step of calculating the relative error of the stress check of the one-way immersed pipe trench according to the first stress check associated parameter, the second stress check associated parameter, the first evaluation coefficient and the second evaluation coefficient comprises:

[0054] Based on the first preset formula, combined with the first arched section length L1, the first suspended section length L2, the first soil compression displacement Δ, and the bending moment M of the pipeline at the end of the first trench excavation max , the length of the second arched section L1′, the length of the second suspended section L2′, the second soil compression displacement Δ′, and the bending moment M′ of the pipeline at the end of the second trench excavation max A calculation is performed to obtain the first stress verification relative error δ.

[0055] Among them, the first preset formula is:

[0056] Based on the second preset formula and in combination with the first evaluation coefficient η and the second evaluation coefficient η′, the second stress verification relative error δ′ is obtained.

[0057] Among them, the second preset formula is:

[0058] 2) The step of determining whether the one-way immersed pipe trench pipeline passes the stress check according to the stress check relative error, the first evaluation coefficient and the second evaluation coefficient comprises:

[0059] When the first evaluation coefficient η and the second evaluation coefficient η′ are both no greater than a first preset value, and when the first stress verification relative error δ and the second stress verification relative error δ′ are both no greater than a second preset value, it is determined that the one-way immersed tube trench pipeline passes the coordinated stress verification.

[0060] The method of collaborative stress verification is: collaborative stress verification is performed by using analytical calculation and numerical simulation. The first preset value is set to 1 by default, and the second preset value is set to 5% by default, which can also be adjusted according to actual conditions and is not limited here.

[0061] When both the first evaluation coefficient and the second evaluation coefficient are not greater than the first preset value, and when the first stress check relative error or the second stress check relative error is greater than the second preset value, it is determined that the one-way immersed tube trench pipeline has passed the single stress check.

[0062] Among them, the single stress check method is: stress check by analytical calculation or numerical simulation. Determining that the one-way immersed pipe trench pipeline has passed the single stress check indicates that the stress check of analytical calculation and numerical simulation has not passed, but the "single" stress check based on analytical calculation or numerical simulation has passed. At this time, whether the stress check has passed needs to be determined by the engineering design personnel based on design experience.

[0063] When the first evaluation coefficient or the second evaluation coefficient is greater than the first preset value, it is determined that the one-way immersed tube trench pipeline has failed the stress check.

[0064] Among them, the determination that the one-way immersed tube trench pipeline has failed the stress check indicates that: the coordinated stress check of analytical calculation and numerical simulation has failed, and at the same time, the "single" stress check based on analytical calculation or numerical simulation has failed. At this time, the stress check is directly judged as failed.

[0065] In an optional manner, based on an analytical calculation method, the step of determining a first stress verification associated parameter of a one-way immersed pipe and a first evaluation coefficient for verifying the stress of the one-way immersed pipe comprises:

[0066] A stress analysis model for one-way immersed tube trench pipeline is established.

[0067] According to the stress analysis model of the one-way immersed tube trench pipeline, the length of the first arched section, the length of the first suspended section, the first soil compression displacement and the bending moment borne by the pipeline at the end of the first trench excavation are calculated, and the maximum bending stress of the one-way immersed tube trench pipeline is obtained.

[0068] Based on the fourth strength theory and in combination with the maximum bending stress, the first evaluation coefficient is calculated.

[0069] Specifically:

[0070] 1) Establish the deformation coordination equation at the end B of the trench excavation: q is the weight per unit length of the pipeline, N / m; E is the elastic modulus of the pipeline, Pa; I is the moment of inertia of the pipeline cross section, m 4 ; Δ is the first soil compression displacement at the end B of the trench excavation, m; F By Because F B The component force in the y-axis direction is provided, N; L is the total length of the deformation section, m; L1 is the length of the deformation section on the ground (ie, the length of the first arched section), m; L2 is the length of the first suspended section, m.

[0071] 2) Establish the deformation coordination equation when the pipeline just sinks into the bottom of the trench (i.e., point C): h is the trench depth, m; F Bx is the component force in the x-axis direction provided by FB, N.

[0072] 3) Establish the moment equation about point A, which is a static equilibrium equation:

[0073] 4) Establish F Bx With F By The relationship between the static equilibrium equation is: F Bx =F By cotθ, θ is the rotation angle of the pipeline at the end B of the trench excavation, rad.

[0074] 5) Establish F through soil spring model and foundation settlement model By The force-displacement relationship with Δ:

[0075] ① Establish F based on soil spring model By The relationship with Δ1 is: Δ1 is the soil compression displacement at the end of the trench excavation obtained by the soil spring model, m; γ is the soil weight, kN / m 3 ; D is the pipe diameter, m; N q , N γ It is the soil compressive capacity factor, which is directly related to the internal friction angle of the soil. It is found in the American ASCE Guidelines For the Seismic Design of Oil and Gas Pipeline System, page 171. Figure 5 .8Get.

[0076] ② Establish F based on foundation settlement model By The relationship with Δ2: Δ2 is the soil compression displacement at the end of the trench excavation obtained by the foundation settlement model, m; E s ′ is the soil compression modulus, Pa; α1 is the average additional stress coefficient, dimensionless, which can be determined by Appendix k on page 137 of GB 50007-2011 "Code for Design of Building Foundations"; is the empirical coefficient of settlement, dimensionless, and is related to the soil compression modulus E s ′ is directly related and can be determined by Table 5.3.5 on page 29 of GB 50007-2011 “Code for Design of Building Foundations”; z1 is the calculated depth of soil deformation, m, which can be calculated by the following formula: z1=D(2.5-ln(D)).

[0077] ③ Establish F based on soil spring model and foundation settlement model By The force-displacement relationship with Δ:

[0078]

[0079] 6) Combine equations ③ in 1)-4) and 5) and solve them using Matlab to obtain the 5 unknown quantities F Bx 、F By , L, L1, Δ, and calculate L2=L-L1.

[0080] 7) If Figure 2 As shown, the bending moment borne by the pipeline at the end of the first trench excavation (the maximum bending moment borne by the pipeline at the end B of the trench excavation) M is obtained. max :

[0081] 8) Calculate the maximum bending stress σ of the pipeline during the process of sinking the pipe max :

[0082] 9) Based on the fourth strength theory, the first evaluation coefficient η is defined to check the pipeline stress. If η>1, it indicates that the strength failure of the pipeline trench has occurred from the perspective of analytical calculation. Otherwise, the pipeline is safe: σ r4 is the fourth strength theoretical equivalent stress, Pa; [σ] is the allowable stress, Pa, according to Article 6.3.3 of Q / SY GDJ 0387-2014 "Construction Specifications for Immersed Pipeline Trenching of Oil and Gas Transmission Pipelines".

[0083] In an optional manner, based on a numerical simulation method, the step of determining the second stress verification associated parameter of the one-way immersed pipe and the second evaluation coefficient for verifying the stress of the one-way immersed pipe comprises:

[0084] A geometric model of the one-way immersed tube trench pipeline is established and simulation conditions are set.

[0085] The sinking process of the one-way immersed pipe in the trench is simulated based on the statics solution type. When the one-way immersed pipe in the trench touches the bottom of the trench, the length of the second arched section, the length of the second suspended section, the second soil compression displacement, the bending moment borne by the pipe at the excavation end of the second trench, and the principal stress of the pipe are output.

[0086] Based on the fourth strength theory and in combination with the pipeline principal stress, the second evaluation coefficient is calculated.

[0087] Specifically:

[0088] 1) Select simulation software and construct a geometric model of a one-way immersed pipe trench pipeline. In the geometric model, the length of the soil is the same as the length of the pipeline, and the width of the soil is 6 times the diameter of the pipeline; preferably, the length of the pipeline in the numerical simulation should be greater than or equal to the total length L of the deformation section given by the analytical calculation, which is the first control condition for the coordination of analytical calculation and numerical simulation.

[0089] 2) Define material properties. Define the density, elastic modulus, Poisson's ratio, yield strength and other material properties of the pipeline; preferably, the density and elastic modulus of the pipeline in the numerical simulation should be consistent with the density and elastic modulus of the pipeline in the analytical calculation. Define the specific gravity, elastic modulus, Poisson's ratio, internal friction angle, expansion angle, cohesion, plastic strain and other material properties of the soil; preferably, the specific gravity and internal friction angle of the soil in the numerical simulation should be consistent with the density and internal friction angle of the soil in the analytical calculation. The pipeline constitutive model selects the bilinear stress-strain strengthening constitutive relationship; the soil constitutive model selects the ideal elastic-plastic Mohr-Coulomb criterion.

[0090] The elastic modulus of soil in numerical simulation should satisfy the following formula with the compression modulus of soil in analytical calculation (this is the second control condition for the coordination between analytical calculation and numerical simulation): E′=k·E s ′; E′ is the elastic modulus of soil, Pa; E s ′ is the soil compression modulus, Pa; k is the proportionality coefficient, dimensionless, obtained through the soil consolidation compression test (soil compression modulus) and triaxial compression test (soil elastic modulus). The test method can refer to GB / T50123-1999 "Standard for Geotechnical Test Methods", or the latest standard can be selected to determine the test method according to actual conditions. There is no restriction here.

[0091] 3) Pipe-soil contact settings. The pipe-soil contact (contact between the pipe and the soil) is set to limited slip surface contact, and the contact tolerance is specified; the friction coefficient is set in the tangential direction of the pipe-soil contact, and the normal direction of the pipe-soil contact is set to hard friction.

[0092] 4) Meshing. Both the pipeline and the soil are simulated using C3D8R eight-node linear hexahedral elements; trench excavation is achieved by deleting the soil elements at the specified geometric position.

[0093] 5) Loads and constraints. ① Load application. Gravity load application: The deadweight of the pipeline and soil is applied through inertial force; Pipeline displacement load application caused by trench excavation: The trench excavation is completed using soil units to achieve the application of pipeline displacement load caused by trench excavation; Displacement loading step setting: Through the analysis of the independence of displacement loading steps, it is recommended to set the pipeline displacement loading step to 5 steps, that is, divide the predetermined length of trench excavation into 5 displacement loading steps. ② Constraint application. If Figure 3 As shown in the figure, full displacement constraints in three directions are applied to the far end of the pipeline, and the near end of the pipeline (the end closer to the starting point of the trench excavation) is the free end; normal displacement constraints are applied to the bottom surface and four side surfaces (except the top surface) of the soil.

[0094] 6) Specify the solution type. Select the static solution type to simulate the process of sinking the pipe into the trench.

[0095] 7) Output the calculation results. Output the second arched section length L1′ when the pipeline just touches the bottom of the trench, the second suspended section length L2′, the second soil compression displacement Δ′, and the bending moment M′ of the pipeline at the end of the second trench excavation. max , the pipe principal stresses of the unit where the stress extreme value is located (first principal stress σ1, second principal stress σ2, third principal stress σ3).

[0096] 8) Based on the fourth strength theory, the second evaluation coefficient η′ is defined to check the pipeline stress. If η′>1, it indicates that the strength failure of the pipeline has occurred from the perspective of numerical simulation, otherwise the pipeline is safe:

[0097]

[0098] To better illustrate the technical solution of this embodiment, the following two examples are used for illustration:

[0099] Example 1:

[0100] 1. Analytical calculation method:

[0101] 1) Set the input parameters in the one-way immersed pipe trench pipeline stress analysis model, including: pipeline outer diameter 1016mm, pipeline wall thickness 26.2mm, pipeline elastic modulus 210GPa, pipeline yield strength 555MPa, pipeline allowable stress 444MPa (0.8 times yield strength), trench depth 2.0m, soil weight 18kN / m 3 , soil internal friction angle 20°, soil compression modulus 5.1MPa.

[0102] 2) Obtain the intermediate process parameters, including: the weight of the pipeline per unit length q = 6264.32N, the moment of inertia of the pipeline cross section I = 9.979 × 109mm 4 , soil compressive capacity factor N q =6.5, N γ =3.0, calculated depth of soil deformation z1 = 2.52m, average additional stress coefficient α1 = 0.1354, settlement empirical coefficient

[0103] 3) Based on the formula in the one-way immersed pipe trench pipeline stress analysis model and the analytical calculation results obtained by Matlab, including: the total length of the deformation section L = 87.6m, the length of the first arched section L1 = 49.6m, the length of the first suspended section L2 = 38.0m, the soil compression displacement Δ = 0.75m at the end of the first trench excavation, and the bending moment M of the pipeline at the end of the first trench excavation. max =4522.84kN.m, maximum pipeline stress σ max =230.24MPa, the fourth strength theoretical equivalent stress σ r4 =σ max =230.24MPa, first evaluation coefficient η=0.52.

[0104] 2. Numerical simulation method:

[0105] 1) Set the input parameters, including: pipeline outer diameter 1016mm, pipeline wall thickness 26.2mm, pipeline length 100m (equal to soil length), pipeline elastic modulus 210GPa, pipeline Poisson's ratio 0.3, pipeline yield strength 555MPa, pipeline allowable stress 444MPa (0.8 times yield strength), soil length 100m (should be greater than or equal to L=87.6m in analytical calculation), soil width 6.1m (6 times pipe diameter), trench excavation depth 2.0m, soil weight 18kN / m 3 , soil internal friction angle 20°, soil elastic modulus 41.82MPa (proportional coefficient k is 8.2), soil Poisson's ratio 0.36, soil expansion angle 8°, soil cohesion 15kPa, soil plastic strain 0.3%, pipe-soil friction coefficient 0.4, pipe-soil contact tolerance 0.1. By introducing the support point compression deformation parameter (the first soil compression displacement Δ), the maximum single excavation depth of the trench under the sunken pipe after calculation is improved, which greatly reduces the construction cost and land acquisition area. The introduction of analysis is conducive to engineering application.

[0106] 2) Obtain the numerical simulation results when the pipeline just touches the bottom of the trench, including: the total length of the deformation section L = 80.7m, the length of the second arched section L1′ = 46.4m, the length of the second suspended section L2′ = 35.3m, the second soil compression displacement Δ′ = 0.69m, and the bending moment M′ of the pipeline at the end of the second trench excavation max =4239.55kN.m, the first principal stress of the unit where the stress extreme value is located σ1 = 227.56MPa, the second principal stress σ2 = 23.58MPa, the third principal stress σ3 = 2.61MPa, the fourth strength theoretical equivalent stress σ r4 =215.23MPa, the second evaluation coefficient η′=0.48.

[0107] Stress verification of one-way immersed pipe trench by analytic calculation and numerical simulation:

[0108] The relative error calculated based on the formula is δ=3.60%; the relative error calculated based on the formula is δ′=4.00%; the collaborative verification result judgment conditions of δ≤5% and δ′≤5% and η≤1 and η′≤1 are met, so the stress verification of the trench under the immersed pipeline is passed.

[0109] Example 2:

[0110] According to Appendix A (existing specification method) of Q / SY GDJ 0387-2014 "Construction Specification for Immersed Pipeline in Oil and Gas Transportation Pipeline", the stress results of the one-way immersed pipe trench are calculated. The input parameters are the same as the input parameters of the "one-way immersed pipe trench pipeline stress analysis model of the present invention" in Example 1. The analytical calculation results obtained include: the total length of the deformation section L = 74.1m, the length of the first arched section L1 = 57.6m, the length of the first suspended section L2 = 40.7m, and the bending moment M of the pipeline at the end of the first trench excavation. max =5199.02kN.m, maximum pipeline stress σ max =264.67MPa, the fourth strength theoretical equivalent stress σ r4 =σ max =264.67MPa.

[0111] The numerical simulation results are used as reference values, and the length of the arched section L1, the length of the suspended section L2, and the bending moment M of the pipeline at the end of the trench excavation are taken into consideration. max , maximum pipeline stress σ max To compare the parameters, the result errors of the one-way immersed tube trench pipeline stress analysis model were 6.90%, 7.64%, 6.68% and 6.98% respectively, and the result errors of the existing specification method were 24.14%, 15.29%, 22.63% and 22.97% respectively; the calculation results show that the calculation accuracy of the one-way immersed tube trench pipeline stress analysis model is improved by 17.24%, 7.65%, 15.94% and 15.99% compared with the existing specification method.

[0112] The technical solution of this embodiment proposes a stress verification method for a one-way immersed pipe trench pipeline based on the coordination of analytical calculation and numerical simulation, which solves the problem that it is difficult to verify the accuracy of the verification results when a single method (analytical calculation or numerical simulation) is used for stress verification. The technical solution of this embodiment optimizes the algorithm, adds the influencing factor of support point compression, and proposes control conditions for the coordination of analytical calculation and numerical simulation. The total length of the pipeline deformation section obtained by analytical calculation controls the minimum value of the pipeline length in the numerical simulation, and the soil compression modulus given in the analytical calculation controls the soil elastic modulus in the numerical simulation. The technical solution of this embodiment establishes a stress analysis model for a one-way immersed pipe trench pipeline. Compared with the existing standard method, parameters such as soil weight, soil internal friction angle, and soil compression modulus are added. The newly added parameters are common parameters for numerical simulation and analytical calculation, which solves the dilemma that analytical calculation is difficult to be verified by numerical simulation due to inconsistent input parameters; taking the numerical simulation results as a reference, the maximum stress calculation accuracy of the pipeline obtained by the proposed model is improved by 15.99% compared with the existing standard method.

[0113] Figure 4 FIG. 2 is a schematic diagram showing a structural embodiment of a one-way immersed pipe trench pipeline stress check system 200 provided by the present invention. Figure 4 As shown, the system 200 includes: a processing module 210 and a verification module 220;

[0114] The processing module 210 is used to: determine the first stress verification associated parameter of the one-way immersed pipe trench pipe and the first evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipe based on an analytical calculation method, and determine the second stress verification associated parameter of the one-way immersed pipe trench pipe and the second evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipe based on a numerical simulation method;

[0115] The verification module 220 is used to calculate the stress verification relative error of the one-way immersed tube trench pipeline according to the first stress verification associated parameter, the second stress verification associated parameter, the first evaluation coefficient and the second evaluation coefficient, and determine whether the one-way immersed tube trench pipeline passes the stress verification according to the stress verification relative error, the first evaluation coefficient and the second evaluation coefficient.

[0116] In an optional manner, the first stress verification associated parameters include: the length of the first arched section, the length of the first suspended section, the first soil compression displacement, and the bending moment borne by the pipeline at the end of the first trench excavation; the second stress verification associated parameters include: the length of the second arched section, the length of the second suspended section, the second soil compression displacement, and the bending moment borne by the pipeline at the end of the second trench excavation.

[0117] In an optional manner, the stress calibration relative error includes: a first stress calibration relative error and a second stress calibration relative error; the calibration module 220 is specifically used for:

[0118] Based on a first preset formula, the first arched section length, the first suspended section length, the first soil compression displacement, the bending moment borne by the pipeline at the first trench excavation end, the second arched section length, the second suspended section length, the second soil compression displacement and the bending moment borne by the pipeline at the second trench excavation end are calculated to obtain the first stress verification relative error;

[0119] The second stress verification relative error is obtained by performing calculation based on a second preset formula in combination with the first evaluation coefficient and the second evaluation coefficient.

[0120] In an optional manner, the verification module 220 is specifically used for:

[0121] When both the first evaluation coefficient and the second evaluation coefficient are not greater than a first preset value, and when both the first stress check relative error and the second stress check relative error are not greater than a second preset value, it is determined that the one-way immersed pipe trench pipeline passes the coordinated stress check; wherein the coordinated stress check is performed by using analytical calculation and numerical simulation;

[0122] When both the first evaluation coefficient and the second evaluation coefficient are not greater than the first preset value, and when the first stress check relative error or the second stress check relative error is greater than the second preset value, it is determined that the one-way immersed pipe trench pipeline passes the single stress check; the single stress check method is: stress check by analytical calculation or numerical simulation;

[0123] When the first evaluation coefficient or the second evaluation coefficient is greater than the first preset value, it is determined that the one-way immersed tube trench pipeline has failed the stress check.

[0124] In an optional manner, the processing module 210 is specifically used for:

[0125] Establish a stress analysis model for one-way immersed pipe trench pipeline;

[0126] According to the one-way immersed pipe trench pipeline stress analysis model, the first arched section length, the first suspended section length, the first soil compression displacement and the bending moment of the pipeline at the first trench excavation end of the one-way immersed pipe trench pipeline are calculated, and the maximum bending stress of the one-way immersed pipe trench pipeline is obtained;

[0127] Based on the fourth strength theory and in combination with the maximum bending stress, the first evaluation coefficient is calculated.

[0128] In an optional manner, the processing module 210 is specifically used for:

[0129] Establishing a geometric model of the one-way immersed pipe trench pipeline and setting simulation conditions;

[0130] The sinking process of the one-way immersed pipe in the trench is simulated based on the statics solution type, and when the one-way immersed pipe in the trench touches the trench bottom, the second arched section length, the second suspended section length, the second soil compression displacement, the bending moment borne by the pipe at the excavation end of the second trench, and the principal stress of the pipe are output;

[0131] Based on the fourth strength theory and in combination with the pipeline principal stress, the second evaluation coefficient is calculated.

[0132] The technical solution of this embodiment solves the problem that it is difficult to verify the accuracy of the stress check results when a single method is used for stress check, and improves the accuracy of stress check of the pipeline in the trench of a one-way immersed tube.

[0133] The above-mentioned parameters and steps for each module to implement corresponding functions in the one-way immersed tube trench pipeline stress verification system 200 of this embodiment can refer to the parameters and steps in the embodiment of the one-way immersed tube trench pipeline stress verification method above, and will not be repeated here.

[0134] like Figure 5 As shown, an electronic device 300 according to an embodiment of the present invention includes a processor 320, the processor 320 is coupled to a memory 310, and the memory 310 stores at least one computer program 330, and the at least one computer program 330 is loaded and executed by the processor 320, so that the electronic device 300 implements any one of the above-mentioned one-way immersed pipe trench pipeline stress verification methods, specifically:

[0135] The electronic device 300 may have relatively large differences due to different configurations or performances, and may include one or more processors 320 (Central Processing Units, CPU) and one or more memories 310, wherein at least one computer program 330 is stored in the one or more memories 310, and the at least one computer program 330 is loaded and executed by the one or more processors 320, so that the electronic device 300 implements any one of the one-way immersed pipe trench pipeline stress verification methods provided in the above embodiments. Of course, the electronic device 300 may also have components such as a wired or wireless network interface, a keyboard, and an input and output interface for input and output, and the electronic device 300 may also include other components for realizing the functions of the device, which will not be repeated here.

[0136] A computer-readable storage medium according to an embodiment of the present invention stores at least one computer program, and the at least one computer program is loaded and executed by a processor so that a computer implements any one of the above-mentioned one-way immersed tube trench pipeline stress verification methods.

[0137] Optionally, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

[0138] In an exemplary embodiment, a computer program product or a computer program is also provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device executes any of the above-mentioned one-way immersed pipe trench pipeline stress verification methods.

[0139] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and represent the definition of a specific order or sequence. The order of use of similar objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than the order shown or described.

[0140] Those skilled in the art know that the present invention can be implemented as a system, method or computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, namely: it can be complete hardware, it can be complete software (including firmware, resident software, microcode, etc.), or it can be a combination of hardware and software, which is generally referred to as "circuit", "module" or "system" herein. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium contains computer-readable program code.

[0141] Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0142] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for checking the stress of a one-way immersed pipe trench, characterized in that: include: Based on an analytical calculation method, a first stress verification associated parameter of a one-way immersed pipe trench pipe and a first evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipe are determined, and based on a numerical simulation method, a second stress verification associated parameter of the one-way immersed pipe trench pipe and a second evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipe are determined; According to the first stress check associated parameter, the second stress check associated parameter, the first evaluation coefficient and the second evaluation coefficient, the stress check relative error of the one-way immersed tube lower trench pipeline is calculated, and according to the stress check relative error, the first evaluation coefficient and the second evaluation coefficient, it is determined whether the one-way immersed tube lower trench pipeline passes the stress check.

2. The one-way immersed pipe trench pipeline stress verification method according to claim 1 is characterized in that: The first stress check associated parameters include: the length of the first arched section, the length of the first suspended section, the first soil compression displacement and the bending moment borne by the pipeline at the end of the first trench excavation; the second stress check associated parameters include: the length of the second arched section, the length of the second suspended section, the second soil compression displacement and the bending moment borne by the pipeline at the end of the second trench excavation.

3. The one-way immersed pipe trench pipeline stress verification method according to claim 2 is characterized in that: The stress check relative error includes: a first stress check relative error and a second stress check relative error; the step of calculating the stress check relative error of the one-way immersed pipe trench pipeline according to the first stress check associated parameter, the second stress check associated parameter, the first evaluation coefficient and the second evaluation coefficient includes: Based on a first preset formula, the first arched section length, the first suspended section length, the first soil compression displacement, the bending moment borne by the pipeline at the first trench excavation end, the second arched section length, the second suspended section length, the second soil compression displacement and the bending moment borne by the pipeline at the second trench excavation end are calculated to obtain the first stress verification relative error; The second stress verification relative error is obtained by performing calculation based on a second preset formula in combination with the first evaluation coefficient and the second evaluation coefficient.

4. The one-way immersed pipe trench pipeline stress verification method according to claim 3 is characterized in that: The step of determining whether the one-way immersed pipe trench pipeline passes the stress check according to the stress check relative error, the first evaluation coefficient and the second evaluation coefficient comprises: When both the first evaluation coefficient and the second evaluation coefficient are not greater than a first preset value, and when both the first stress check relative error and the second stress check relative error are not greater than a second preset value, it is determined that the one-way immersed pipe trench pipeline passes the coordinated stress check; wherein the coordinated stress check is performed by using analytical calculation and numerical simulation; When both the first evaluation coefficient and the second evaluation coefficient are not greater than the first preset value, and when the first stress check relative error or the second stress check relative error is greater than the second preset value, it is determined that the one-way immersed pipe trench pipeline passes the single stress check; the single stress check method is: stress check by analytical calculation or numerical simulation; When the first evaluation coefficient or the second evaluation coefficient is greater than the first preset value, it is determined that the one-way immersed tube trench pipeline has failed the stress check.

5. The one-way immersed pipe trench pipeline stress verification method according to any one of claims 2 to 4, characterized in that: The step of determining the first stress verification associated parameter of the one-way immersed pipe trench pipeline and the first evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipeline based on an analytical calculation method includes: Establish a stress analysis model for one-way immersed pipe trench pipeline; According to the one-way immersed pipe trench pipeline stress analysis model, the first arched section length, the first suspended section length, the first soil compression displacement and the bending moment of the pipeline at the first trench excavation end of the one-way immersed pipe trench pipeline are calculated, and the maximum bending stress of the one-way immersed pipe trench pipeline is obtained; Based on the fourth strength theory and in combination with the maximum bending stress, the first evaluation coefficient is calculated.

6. The one-way immersed pipe trench pipeline stress verification method according to any one of claims 2 to 4, characterized in that: The step of determining the second stress verification associated parameter of the one-way immersed pipe and the second evaluation coefficient for verifying the stress of the one-way immersed pipe in the trench based on the numerical simulation method includes: Establishing a geometric model of the one-way immersed pipe trench pipeline and setting simulation conditions; The sinking process of the one-way immersed pipe in the trench is simulated based on the statics solution type, and when the one-way immersed pipe in the trench touches the trench bottom, the second arched section length, the second suspended section length, the second soil compression displacement, the bending moment borne by the pipe at the excavation end of the second trench, and the principal stress of the pipe are output; Based on the fourth strength theory and in combination with the pipeline principal stress, the second evaluation coefficient is calculated.

7. A one-way immersed pipe trench pipeline stress verification system, characterized in that: include: Processing module and verification module; The processing module is used to: determine the first stress verification associated parameter of the one-way immersed pipe trench pipeline and the first evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipeline based on an analytical calculation method, and determine the second stress verification associated parameter of the one-way immersed pipe trench pipeline and the second evaluation coefficient for verifying the stress of the one-way immersed pipe trench pipeline based on a numerical simulation method; The verification module is used to calculate the stress verification relative error of the one-way immersed tube trench pipeline according to the first stress verification associated parameter, the second stress verification associated parameter, the first evaluation coefficient and the second evaluation coefficient, and determine whether the one-way immersed tube trench pipeline passes the stress verification according to the stress verification relative error, the first evaluation coefficient and the second evaluation coefficient.

8. The one-way immersed pipe trench pipeline stress verification system according to claim 7 is characterized in that: The first stress check associated parameters include: the length of the first arched section, the length of the first suspended section, the first soil compression displacement and the bending moment borne by the pipeline at the end of the first trench excavation; the second stress check associated parameters include: the length of the second arched section, the length of the second suspended section, the second soil compression displacement and the bending moment borne by the pipeline at the end of the second trench excavation.

9. An electronic device, characterized in that: The electronic device includes a processor, the processor is coupled to a memory, at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor so that the electronic device implements the one-way immersed tube trench pipeline stress verification method as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: At least one computer program is stored in the computer-readable storage medium, and the at least one computer program is loaded and executed by the processor so that the computer-readable storage medium implements the one-way immersed tube trench pipeline stress verification method as described in any one of claims 1 to 6.

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