Method for evaluating damage failure of buried oil and gas pipeline under blast load

Abstract

The invention discloses a buried oil and gas pipeline damage failure assessment method, system, equipment and medium under an explosion load, and belongs to the technical field of pipeline damage detection. The maximum diameter and the minimum diameter of the sunken section of a pipeline within a safety range threshold after a simulation buried oil and gas pipeline explosion experiment are acquired; calculating a safety critical value of a pipeline section critical safety deformation ratio; establishing a mapping relation between the safety deformation ratio and the overpressure P and the impulse I of the explosive shock wave; based on the safety critical value, multiple sets of different overpressures P are applied to the pipeline in a simulation mode, multiple sets of impulses I are calculated, then a P-I curve is obtained through fitting, and a pipeline damage failure evaluation model is established according to the P-I curve; according to the method, the overpressure P1 under the actual explosion load is obtained, the corresponding impulse I1 is calculated, the coordinate positions of the P1 and the I1 in the pipeline damage failure evaluation model are positioned, the failure condition of the current buried oil and gas pipeline is rapidly judged, precious time is gained for timely countermeasures, and safety risks and economic losses possibly caused by pipeline failure can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline damage detection, and in particular to a method, system and computer equipment for evaluating damage failure of buried oil and gas pipelines based on a critical safety deformation ratio of a pipeline cross section. Background Art

[0002] As an important strategic resource, the safety of oil and gas pipeline transportation has a significant impact on national security and social stability. Oil and gas pipelines are often buried under the soil. Due to the impact of accidental explosions and artificial blasting construction, the shallow buried blast load (equivalent depth does not exceed 0.8m / kg) 1 / 3 ) has become one of the main threats to buried oil and gas pipelines from third-party damage.

[0003] Therefore, how to quickly identify whether the oil and gas pipelines are safe after the explosion is urgent.

[0004] Some researchers have studied the damage, failure, and dynamic response of pipeline components under explosive impact loads. However, the reference standards for existing research results (such as GB 50253-2014) mainly rely on static ellipticity or a single deformation threshold (such as 3% pipe diameter depression) to judge pipeline failure. When a pipeline is subjected to explosive impact, judging according to static standards may underestimate or overestimate the actual load-bearing capacity and failure risk of the pipeline. Summary of the Invention

[0005] To address the above-mentioned issues, the present invention considers the dynamic coupling effect of damage and failure of fixed-end constrained buried oil and gas pipelines with different design parameters on the overpressure P and impulse I of the explosion load, and simultaneously analyzes the correlation between pipeline concave deformation and cross-sectional shape change (critical safety deformation ratio). A method, system, computer equipment, and storage medium for assessing damage and failure of buried oil and gas pipelines under explosion loads are provided, which can intuitively judge whether the buried oil and gas pipeline is within a safe range after the explosion.

[0006] To achieve the above objectives, the present invention provides a method for assessing damage and failure of buried oil and gas pipelines under explosive loads, comprising the following steps:

[0007] The maximum and minimum diameters of the concave section of the buried oil and gas pipeline within the safety range threshold after the simulated explosion test are collected. Based on the maximum and minimum diameters of the concave section of the buried oil and gas pipeline and the outer diameter of the pipeline, the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline section is calculated;

[0008] Establish a mapping relationship between the critical safety deformation ratio of the buried oil and gas pipeline section and the overpressure P and impulse I of the explosion shock wave;

[0009] Based on the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline cross section, multiple sets of overpressures P of different explosion shock waves are simulated and applied to the buried oil and gas pipeline. Multiple sets of impulses I that grow over time are calculated based on the mapping relationship and the multiple sets of overpressures P. The multiple sets of overpressures P and impulses I are fitted to obtain PI curves, and a pipeline damage failure assessment model is established based on the PI curves.

[0010] The overpressure P1 of the buried oil and gas pipeline under the actual explosion load is obtained, and the corresponding impulse I1 is calculated. The coordinate positions of the overpressure P1 and impulse I1 in the pipeline damage failure assessment model are located to determine the current failure status of the buried oil and gas pipeline.

[0011] Preferably, the maximum diameter and minimum diameter of the oil and gas pipeline cross section within the acquisition safety range threshold are specifically:

[0012] Multiple simulated explosion experiments were conducted on buried oil and gas pipelines, and buried oil and gas pipelines that met the safety range threshold were marked. The maximum diameter and minimum diameter of the maximum concave deformation section of the marked pipeline explosion surface were collected, where the maximum diameter and minimum diameter were both the outer diameter of the buried oil and gas pipeline.

[0013] Preferably, the critical safety deformation ratio of the cross section Δ θ Specifically:

[0014]

[0015] Where D is the outer diameter of the buried oil and gas pipeline, D max D is the maximum outer diameter of the maximum concave deformation section of the explosion-facing surface of the buried oil and gas pipeline, min It is the minimum outer diameter of the maximum cross-section of the explosion-facing surface of the buried oil and gas pipeline.

[0016] Preferably, the mapping relationship between the critical safety deformation ratio of the buried oil and gas pipeline section and the overpressure P and impulse I is:

[0017] (PP * )(Ii * )=DN;

[0018] Where P is the overpressure of the explosion shock wave, I is the forward impulse generated by the explosion shock wave, and P * The critical overpressure value that causes damage to the target buried oil and gas pipeline is i * The critical impulse value that causes damage to the target buried oil and gas pipeline is DN, which is a constant factor related to the damage to the target buried oil and gas pipeline.

[0019] Preferably, the pipeline damage failure assessment model is:

[0020]

[0021] Where P is the overpressure of the explosion shock wave, I is the forward impulse generated by the explosion shock wave, and a, b, and c are real constants related to the damage to the pipeline in the explosion environment.

[0022] Preferably, the determining whether the current pipeline is valid based on the overpressure P1 and the impulse I1 specifically includes the following steps:

[0023] According to the overpressure P1 of the buried oil and gas pipeline under the actual explosion load, I1 is determined and recorded as (I 1, P1);

[0024] Mark (I 1, P1) The position of point in the pipeline damage failure assessment model;

[0025] If the point falls in the lower left area of the PI curve, it is determined that the buried oil and gas pipeline is safe at this time;

[0026] If the point falls on the PI curve or in the upper right of the PI curve, it is determined that the buried oil and gas pipeline is in failure state.

[0027] The present invention also proposes a system for assessing damage and failure of buried oil and gas pipelines under explosive loads, comprising:

[0028] A calculation module is used to collect the maximum and minimum diameters of the concave section of the buried oil and gas pipeline within the safety range threshold after the simulated explosion test, and calculate the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline section based on the maximum and minimum diameters of the concave section of the buried oil and gas pipeline and the outer diameter of the pipeline;

[0029] A mapping module is used to establish a mapping relationship between the critical safety deformation ratio of the buried oil and gas pipeline section and the overpressure P and impulse I of the explosion shock wave;

[0030] A model building module is used to simulate the application of multiple sets of overpressures P of different explosion shock waves to the buried oil and gas pipeline based on the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline cross section, calculate multiple sets of impulses I that increase over time based on the mapping relationship and the multiple sets of overpressures P, fit the multiple sets of overpressures P and impulses I to obtain PI curves, and establish a pipeline damage failure assessment model based on the PI curves;

[0031] The assessment module is used to obtain the overpressure P1 of the buried oil and gas pipeline under the actual explosion load, calculate the corresponding impulse I1, locate the coordinate positions of the overpressure P1 and impulse I1 in the pipeline damage failure assessment model, and determine the current failure status of the buried oil and gas pipeline.

[0032] The present invention also provides a computer device comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement any one of the steps in the method for assessing damage and failure of buried oil and gas pipelines under explosive loads.

[0033] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is loaded by a processor, the computer program can execute any one of the steps in the method for assessing damage and failure of buried oil and gas pipelines under explosive loads.

[0034] The present invention provides a method for assessing damage and failure of buried oil and gas pipelines under explosive loads, which has the following beneficial effects:

[0035] The present invention relates to a buried oil and gas pipeline damage failure assessment method based on a critical safety deformation ratio of a pipeline cross section. The assessment method establishes a PI curve mapping relationship through the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline cross section, fits the PI curve according to explosion simulation data, and establishes a pipeline damage failure assessment model with high calculation accuracy and adjustable universality. The method obtains the overpressure P and impulse I experienced by the buried oil and gas pipeline under actual explosion loads, and through the position of the (I, P) coordinates in the pipeline damage failure assessment model, it can quickly determine whether the buried oil and gas pipeline has failed after being subjected to the explosion, thereby buying valuable time for timely implementation of countermeasures and effectively reducing the safety risks and economic losses that may be caused by pipeline failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the embodiments of the present invention and its design, the following briefly introduces the drawings required for this embodiment. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0037] Figure 1 A flowchart of a method for assessing damage and failure of buried oil and gas pipelines under explosive loads provided by an embodiment of the present invention;

[0038] Figure 2 A pipeline damage failure assessment model provided by an embodiment of the present invention;

[0039] Figure 3 PI curve diagram of an experimental buried pipeline containing a local defect POZD pipeline provided by an embodiment of the present invention;

[0040] Figure 4 This is a comparison chart of the PI curve fitted by the formula provided in an embodiment of the present invention and the PI curve of numerical simulation. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be understood by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable the reader to better understand the present invention. However, even without these technical details and the various changes and modifications based on the following embodiments, the technical solutions claimed in the present invention can be implemented. The division of the following embodiments is for convenience of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with each other and referenced to each other under the premise that there is no contradiction.

[0042] One embodiment of the present invention relates to a method for assessing damage and failure of buried oil and gas pipelines under explosive loads. The following describes the implementation details of the damage assessment method of this embodiment. The following content is only provided for ease of understanding and is not required for implementing this solution.

[0043] like Figure 1 As shown, the specific process of damage failure of buried oil and gas pipelines under explosion load in this embodiment includes:

[0044] S1. Collect the maximum and minimum diameters of the concave section of the pipeline within the safety range threshold after the simulated buried oil and gas pipeline explosion test, and calculate the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline section based on the maximum and minimum diameters of the concave section of the pipeline and the outer diameter of the buried pipeline.

[0045] S1.1. Conduct an explosion test on buried oil and gas pipelines. According to the "Code for Design of Oil Pipeline Engineering" (GB 50253-2014), when deformation reaches 3% of the outer diameter of the steel pipe, the pipeline still meets operational safety requirements. When deformation reaches 20% of the outer diameter of the steel pipe, the entire pipeline structure is considered to have failed. Pipelines within the safety threshold are marked for effective diameter data sampling.

[0046] S1.2. Use high-precision dynamic monitoring technology to collect the maximum and minimum diameters of the largest section of the pipeline's explosion-facing surface where it is concave and deformed. The maximum and minimum diameters can be the outer diameter of the buried oil and gas pipeline. Calculate the critical safety value of the critical safety deformation ratio of the buried oil and gas pipeline section based on the ratio of the square root of the sum of the squares of the maximum and minimum diameters to the buried pipeline diameter.

[0047]

[0048] Where D is the outer diameter of the pipe, D max D is the maximum outer diameter of the maximum section of the pipeline's explosion-facing surface, min It is the minimum outer diameter of the maximum concave deformation section of the explosion-facing surface of the pipeline.

[0049] S1.3. Calculate the safety range for damage assessment of buried oil and gas pipelines based on the critical safety deformation ratio of the pipeline section under fixed-end constraints. The safety range can be simply expressed as follows: if the critical safety deformation ratio of the section is less than 6%, the oil and gas pipeline is considered safe; if the critical safety deformation ratio of the section is greater than or equal to 6%, the overall structure of the oil and gas pipeline is considered to have failed.

[0050] Δ θ <6% safe

[0051] Δ θ ≥6% failure

[0052] S2. Establish a mapping relationship between the critical safety deformation ratio of the pipeline section and the overpressure P and impulse I of the explosion shock wave.

[0053] S2.1. Conduct multiple numerical simulations using the established numerical model of the pipeline under blast load. After each simulation, select the unit with the largest concave deformation on the pipeline's blast-facing surface and obtain its displacement time history curve. Pair the critical safety deformation ratio of the cross-section, used in the established damage and failure assessment criteria, with the peak overpressure P and specific impulse I.

[0054] S2.2. Plot the pressure and impulse data points obtained from a large number of numerical simulations on the PI plane. From these data points, find the overpressure-impulse combination values that meet the critical safety deformation ratio of the model section at the 6% damage level cutoff point, and substitute them into the overpressure-PI impulse damage theory expression:

[0055] (PP * )(Ii * )=DN;

[0056] Where P is the overpressure of the explosion shock wave, I is the forward impulse generated by the explosion shock wave, and P * The critical overpressure value that causes damage to the target buried oil and gas pipeline is i * The critical impulse value that causes damage to the target buried oil and gas pipeline is DN, which is a constant factor related to the damage to the target buried oil and gas pipeline.

[0057] The damage safety level dividing lines of two buried pipelines, namely the PI curves, are obtained.

[0058] S3. Based on the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline cross-section, multiple sets of overpressures P of different explosion shock waves are simulated and applied to the buried oil and gas pipeline. Multiple sets of impulses I that grow over time are calculated based on the mapping relationship and the multiple sets of overpressures P. The multiple sets of overpressures P and impulses I are fitted to obtain a PI curve, and a pipeline damage failure assessment model is established based on the PI curve.

[0059] S3.1. Fit the PI curve to make the obtained pipeline PI curve have a clear mathematical meaning. By analyzing the data, it can be found that P and I are approximately in a power function relationship. Therefore, the fitting expression of the PI curve is determined by calculation:

[0060]

[0061] Where P is the peak overpressure of the explosion shock wave, I is the impulse of the forward phase of the explosion shock wave, and a, b, and c are real constants related to the explosion environment and the damage to the pipeline.

[0062] The critical safety deformation ratio of the cross section defined in this invention is based on the cross-sectional deformation of buried oil and gas pipelines. By simultaneously considering pipeline concave deformation and changes in cross-sectional shape, this method can effectively determine the damage to buried oil and gas pipelines under explosive loads. By generalizing the above formula to general conditions, a damage assessment criterion for buried oil and gas pipelines based on the critical safety deformation ratio of the cross section is established. For example, using a critical safety deformation ratio of 6% for a POZD pipeline as the criterion, the above formula can be transformed into:

[0063]

[0064] S4. Obtain the overpressure P1 of the buried oil and gas pipeline under the actual explosion load, input the overpressure P1 into the pipeline damage failure assessment model to obtain the impulse I1, and determine the current failure status of the pipeline based on the overpressure P1 and the impulse I1.

[0065] S4.1. Determine I1 based on the overpressure P1 of the buried oil and gas pipeline under the actual explosion load, and record it as (I 1, P1); Mark (I 1, Point P1) is located in the pipeline damage failure assessment model; if the point falls in the lower left area of the PI curve, the buried oil and gas pipeline is judged to be safe at this time; if the point falls on the PI curve or in the upper right area of the PI curve, the buried oil and gas pipeline is judged to be in failure at this time.

[0066] The correctness and accuracy of the evaluation criteria of the present invention are verified below.

[0067] This embodiment uses the results of shallow static explosion tests on buried oil and gas pipelines as a basis to numerically simulate the dynamic response of buried oil and gas pipelines under shallow explosion loads. The overpressure P-impulse I damage theory is introduced into the damage and failure evaluation of buried oil and gas pipelines. A buried oil and gas pipeline damage and failure assessment criterion based on the critical safety deformation ratio of the pipeline cross-section is established. This can verify the correctness and accuracy of the calculation method of the present invention.

[0068] Figure 2The meaning of the pipeline damage failure assessment model is as follows: the curve divides the PI space into two parts. If the data point of the P and I combination falls on the lower left of the 6% curve, it indicates that the critical safety deformation ratio of the POZD pipeline with local defects does not exceed 6%, the deformation is still within the safe range, and the POZD pipeline with local defects can be judged as safe. If the data point of the P and I combination falls on the upper right of the 6% curve, it indicates that the critical safety deformation ratio of the POZD pipeline with local defects exceeds 6%, the deformation is within the failure range, and the POZD pipeline with local defects can be judged as failed.

[0069] Figure 3 The experimental data is marked on the PI curve. For example, according to the numerical simulation of the buried static explosion test of the present invention, the critical safety deformation ratio of the cross-section of the buried oil and gas pipeline for the concave deformation of the explosion-facing surface corresponds to an overpressure and impulse combination of P = 11.36 MPa and I = 10.32 MPa·ms. If this data point falls to the upper right of the 6% curve, it can be determined that the buried pipeline has failed.

[0070] To further verify the theoretical analysis, the two types of pipes were cut radially perpendicular to the axial direction. The measured critical safety deformation ratios of the two types of pipe sections were 76.50% and 62.47%, respectively (Table 1), consistent with the theoretical analysis results.

[0071] Table 1 Measurement table of critical safety deformation ratio of two groups of pipeline sections

[0072]

[0073] like Figure 4 As shown, the calculation method of the present invention describes the degree and mechanism of influence of the critical safety deformation ratio of a pipeline cross section on the determination of damage and failure of buried oil and gas pipelines under explosive loads, with clear physical significance. The PI curve fitted by this method agrees well with the numerical simulation PI curve and lies below the numerical simulation result, indicating that the curve drawn by the formula has a greater safety margin than the actual one. Therefore, the PI curve fitting formula can be generalized to establish a pipeline damage assessment model using the critical safety deformation ratio of the cross section as an indicator.

[0074] Based on the same inventive concept, the present invention also provides a system for assessing damage and failure of buried oil and gas pipelines under explosive loads, comprising:

[0075] A calculation module is used to collect the maximum and minimum diameters of the concave section of the buried oil and gas pipeline within the safety range threshold after the simulated explosion test, and calculate the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline section based on the maximum and minimum diameters of the concave section of the buried oil and gas pipeline and the outer diameter of the pipeline;

[0076] A mapping module is used to establish a mapping relationship between the critical safety deformation ratio of the buried oil and gas pipeline section and the overpressure P and impulse I of the explosion shock wave;

[0077] A model building module is used to simulate the application of multiple sets of overpressures P of different explosion shock waves to the buried oil and gas pipeline based on the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline cross section, calculate multiple sets of impulses I that increase over time based on the mapping relationship and the multiple sets of overpressures P, fit the multiple sets of overpressures P and impulses I to obtain PI curves, and establish a pipeline damage failure assessment model based on the PI curves;

[0078] The assessment module is used to obtain the overpressure P1 of the buried oil and gas pipeline under the actual explosion load, calculate the corresponding impulse I1, locate the coordinate positions of the overpressure P1 and impulse I1 in the pipeline damage failure assessment model, and determine the current failure status of the buried oil and gas pipeline.

[0079] The present invention also provides a computer device. At the hardware level, the computer device includes a processor, an internal bus, a network interface, memory, and non-volatile storage, and may also include other hardware required for operations. The processor reads a corresponding computer program from the non-volatile storage, transfers it to the internal memory, and then executes it to implement the aforementioned method for assessing and analyzing buried oil and gas pipeline damage and failure under explosive loads.

[0080] The present invention also provides a computer-readable storage medium storing a computer program, which can be used to execute the above-mentioned method for evaluating and analyzing damage and failure of buried oil and gas pipelines under explosive loads.

[0081] The specific limitations of the calculation system for the method for assessing damage and failure of buried oil and gas pipelines under blast loads can be found in the aforementioned limitations on the calculation system for assessing damage and failure of buried oil and gas pipelines under blast loads, and will not be further elaborated here. Each module in the aforementioned calculation system for assessing damage and failure of buried oil and gas pipelines under blast loads can be implemented in whole or in part through software, hardware, or a combination thereof. Each of these modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each of these modules.

[0082] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. In addition, the above-mentioned embodiments only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of this application, several variations and improvements can be made, which all fall within the scope of protection of this application. Therefore, the scope of protection of the patent in this application shall be based on the attached claims.

Claims

1. A method for assessing damage and failure of buried oil and gas pipelines under explosive loads, characterized in that: include: The maximum and minimum diameters of the concave section of the buried oil and gas pipeline within the safety range threshold after the simulated explosion test are collected. Based on the maximum and minimum diameters of the concave section of the buried oil and gas pipeline and the outer diameter of the pipeline, the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline section is calculated; Establish a mapping relationship between the critical safety deformation ratio of the buried oil and gas pipeline section and the overpressure P and impulse I of the explosion shock wave; Based on the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline cross section, multiple sets of overpressures P of different explosion shock waves are simulated and applied to the buried oil and gas pipeline. Multiple sets of impulses I that grow over time are calculated based on the mapping relationship and the multiple sets of overpressures P. The multiple sets of overpressures P and impulses I are fitted to obtain PI curves, and a pipeline damage failure assessment model is established based on the PI curves. The overpressure P1 of the buried oil and gas pipeline under the actual explosion load is obtained, and the corresponding impulse I1 is calculated. The coordinate positions of the overpressure P1 and impulse I1 in the pipeline damage failure assessment model are located to determine the current failure status of the buried oil and gas pipeline.

2. The method for assessing damage and failure of buried oil and gas pipelines under explosion load according to claim 1, characterized in that: The maximum and minimum diameters of the oil and gas pipeline cross section within the acquisition safety range threshold are specifically: Multiple simulated explosion experiments were conducted on buried oil and gas pipelines, and buried oil and gas pipelines that met the safety range threshold were marked. The maximum diameter and minimum diameter of the maximum concave deformation section of the marked pipeline explosion surface were collected, where the maximum diameter and minimum diameter were both the outer diameter of the buried oil and gas pipeline.

3. The method for assessing damage and failure of buried oil and gas pipelines under explosion loads according to claim 2, characterized in that: The critical safety deformation ratio of the cross section Δ θ Specifically: Where D is the outer diameter of the buried oil and gas pipeline, D max D is the maximum outer diameter of the maximum concave deformation section of the explosion-facing surface of the buried oil and gas pipeline, min It is the minimum outer diameter of the maximum cross-section of the explosion-facing surface of the buried oil and gas pipeline.

4. The method for assessing damage and failure of buried oil and gas pipelines under explosion loads according to claim 1, characterized in that: The mapping relationship between the critical safety deformation ratio of the buried oil and gas pipeline section and the overpressure P and impulse I is: (P-P * )(I-i * )=DN; Where P is the overpressure of the explosion shock wave, I is the forward impulse generated by the explosion shock wave, and P * The critical overpressure value that causes damage to the target buried oil and gas pipeline is i * The critical impulse value that causes damage to the target buried oil and gas pipeline is DN, which is a constant factor related to the damage to the target buried oil and gas pipeline.

5. The method for assessing damage and failure of buried oil and gas pipelines under explosion loads according to claim 1, characterized in that: The pipeline damage failure assessment model is: Where P is the overpressure of the explosion shock wave, I is the forward impulse generated by the explosion shock wave, and a, b, and c are real constants related to the damage to the pipeline in the explosion environment.

6. The method for evaluating damage and failure of buried oil and gas pipelines under explosion loads according to claim 1, characterized in that: The method of determining whether the current pipeline is valid based on the overpressure P1 and the impulse I1 specifically includes the following steps: According to the overpressure P1 of the buried oil and gas pipeline under the actual explosion load, I1 is determined and recorded as (I1, P1); Mark the location of point (I1, P1) in the pipeline damage failure assessment model; If the point falls in the lower left area of the PI curve, it is determined that the buried oil and gas pipeline is safe at this time; If the point falls on the PI curve or in the upper right of the PI curve, it is determined that the buried oil and gas pipeline is in failure state.

7. A system for assessing damage and failure of buried oil and gas pipelines under explosive loads, characterized in that: include: A calculation module is used to collect the maximum and minimum diameters of the concave section of the buried oil and gas pipeline within the safety range threshold after the simulated explosion test, and calculate the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline section based on the maximum and minimum diameters of the concave section of the buried oil and gas pipeline and the outer diameter of the pipeline; A mapping module is used to establish a mapping relationship between the critical safety deformation ratio of the buried oil and gas pipeline section and the overpressure P and impulse I of the explosion shock wave; A model building module is used to simulate the application of multiple sets of overpressures P of different explosion shock waves to the buried oil and gas pipeline based on the safety critical value of the critical safety deformation ratio of the buried oil and gas pipeline cross section, calculate multiple sets of impulses I that increase over time based on the mapping relationship and the multiple sets of overpressures P, fit the multiple sets of overpressures P and impulses I to obtain PI curves, and establish a pipeline damage failure assessment model based on the PI curves; The assessment module is used to obtain the overpressure P1 of the buried oil and gas pipeline under the actual explosion load, calculate the corresponding impulse I1, locate the coordinate positions of the overpressure P1 and impulse I1 in the pipeline damage failure assessment model, and determine the current failure status of the buried oil and gas pipeline.

8. A computer device, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the method steps according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method steps according to any one of claims 1 to 6 are implemented.

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