CN115544702A - Method, device and equipment for checking stress of oil-gas pipeline immersed tube construction and storage medium - Google Patents
Method, device and equipment for checking stress of oil-gas pipeline immersed tube construction and storage medium Download PDFInfo
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- G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
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Abstract
The application provides a finite element-based method, a finite element-based device and a finite element-based equipment for checking the stress of oil-gas pipeline immersed tube construction, and a storage medium. The method comprises the following steps: establishing a first immersed tube finite element model according to immersed tube parameters, and acquiring a first current maximum stress value of the oil-gas pipeline output by the first immersed tube finite element model; updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model, and acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model; and updating at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil and gas pipeline to obtain a third immersed tube finite element model, wherein the immersed tube parameters of the third immersed tube finite element model are used for the construction site. The method solves the problems that the calculation efficiency and the checking quality are reduced due to the fact that the existing method wastes time and labor in the calculation process and certain errors and errors exist.
Description
Technical Field
The application relates to the technical field of pipeline construction, in particular to a finite element-based method, a finite element-based device and a finite element-based equipment for checking the stress of oil-gas pipeline immersed tube construction and a storage medium.
Background
The oil gas pipeline is one of main modes for transporting oil gas resources globally, has the advantages of high efficiency, low cost, sustainable transportation and the like, and plays an extremely important role in promoting the development process of national economic construction.
The safety check work in the oil and gas pipeline construction engineering is enhanced to ensure the safety and reliability of the oil and gas pipeline transportation, so that the quality of the oil and gas pipeline engineering is fundamentally ensured. In the process of buried oil and gas pipeline construction, an important ring is the operation of sinking the oil and gas pipeline into the ditch. The stress calculation means in the oil-gas pipeline immersed tube gully sinking construction process in the prior art is mainly completed through theoretical mathematical calculation, and is checked based on calculated stress data. In the actual process of engineering, parameters such as the construction depth of pipelines, soil and immersed tubes and the like are continuously adjusted according to the actual construction condition.
In the existing method, parameters need to be input manually in the calculation process, time and labor are wasted, certain errors and errors possibly exist, the calculation efficiency and the checking quality are reduced, and potential safety hazards exist in the pipeline immersed pipe ditching operation.
Disclosure of Invention
The application provides a finite element-based method, a finite element-based device, a finite element-based equipment and a finite element-based storage medium for checking the stress of oil-gas pipeline immersed tube construction, which are used for solving the problems of time and labor waste in the calculation process, certain errors and errors, and reduced calculation efficiency and checking quality.
On one hand, the application provides a finite element-based method for checking the stress of oil and gas pipeline immersed tube construction, which comprises the following steps:
establishing a first immersed tube finite element model according to immersed tube parameters, and acquiring a first current maximum stress value of an oil-gas pipeline output by the first immersed tube finite element model, wherein the immersed tube parameters comprise pipeline parameters, soil parameters and construction parameters;
updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model, and acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model;
and updating at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil and gas pipeline to obtain a third immersed tube finite element model, wherein the immersed tube parameters of the third immersed tube finite element model are used for guiding a construction site.
Optionally, the updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model, including:
judging whether the first current maximum stress value is matched with the historical measured maximum stress value;
if not, updating the soil parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected first current maximum stress value;
and repeatedly executing the process of updating the soil parameters and the construction parameters until the corrected first current maximum stress value is matched with the historical actual measured maximum stress value, and obtaining a second immersed tube finite element model.
Optionally, the updating at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil and gas pipeline to obtain a third immersed tube finite element model, including:
judging whether the second current maximum stress value is smaller than the allowable stress value;
if not, updating the pipeline parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected second current maximum stress value;
and repeating the process of updating the pipeline parameters and the construction parameters until the corrected second current maximum stress value is smaller than the allowable stress value, and obtaining a third immersed tube finite element model.
Optionally, the pipe parameters include pipe diameter, pipe wall thickness, elbow angle, and elbow size;
the soil parameters include soil type and friction coefficient;
the construction parameters comprise pipe ditch parameters, buttress setting parameters and pipeline additional load.
Optionally, the immersed tube finite element model satisfies at least one of the following conditions:
if the oil-gas pipeline is long enough, the end part of the oil-gas pipeline cannot be influenced when a ditch-descending point is started to descend;
free constraint is adopted at two ends of the oil and gas pipeline;
in the process of sinking the pipe into the ditch, the supporting action between the oil gas pipeline and the soil body is simulated by adopting a contact unit;
simulating a soil body and a buttress by using a discrete rigid body;
different trench bottom depths generated by excavating the excavator are simulated by moving the soil blocks on the right side downwards.
Optionally, the oil and gas pipeline body adopts a first-order shear deformation beam unit model in abaqus software.
Optionally, the sinking tube finite element model is a model established by abaqus nonlinear finite element simulation software.
On the other hand, this application provides an oil gas pipeline immersed tube construction stress check device based on finite element includes:
the first modeling module is used for establishing a first immersed tube finite element model according to immersed tube parameters and acquiring a first current maximum stress value of an oil-gas pipeline output by the first immersed tube finite element model, wherein the immersed tube parameters comprise pipeline parameters, soil parameters and construction parameters;
the second modeling module is used for updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model and acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model;
and the third modeling module is used for updating at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil and gas pipeline to obtain a third immersed tube finite element model, wherein the immersed tube parameters of the third immersed tube finite element model are used for a construction site.
Optionally, the second modeling module is specifically configured to:
judging whether the first current maximum stress value is smaller than the historical measured maximum stress value;
if not, updating the soil parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected first current maximum stress value;
and repeatedly executing the process of updating the soil parameters and the construction parameters until the corrected first current maximum stress value is smaller than the historical actual measurement maximum stress value, and obtaining a second immersed tube finite element model.
Optionally, the third modeling module is specifically configured to:
judging whether the second current maximum stress value is smaller than the allowable stress value or not;
if not, updating the pipeline parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected second current maximum stress value;
and repeating the process of updating the pipeline parameters and the construction parameters until the corrected second current maximum stress value is smaller than the allowable stress value, and obtaining a third immersed tube finite element model.
Optionally, the pipe parameters include pipe diameter, pipe wall thickness, elbow angle, and elbow size;
the soil parameters comprise soil type and friction coefficient;
the construction parameters comprise pipe ditch parameters, pier setting parameters and pipeline additional load.
Optionally, the immersed tube finite element model satisfies at least one of the following conditions:
if the oil-gas pipeline is long enough, the end part of the oil-gas pipeline cannot be influenced when a ditch-descending point is started to descend;
free constraint is adopted at two ends of the oil and gas pipeline;
in the process of sinking the pipe into the ditch, the supporting action between the oil gas pipeline and the soil body is simulated by adopting a contact unit;
simulating a soil body and a buttress by using a discrete rigid body;
different trench bottom depths generated by excavating an excavator are simulated by moving the soil blocks on the right side downwards.
Optionally, the oil and gas pipeline body adopts a first-order shear deformation beam unit model in abaqus software.
Optionally, the sinking tube finite element model is a model established by abaqus nonlinear finite element simulation software.
In a third aspect of the present application, there is provided an electronic device including:
a processor and a memory;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored by the memory to cause the electronic device to perform the method of any of the first aspects.
In a fourth aspect of the present application, a computer-readable storage medium is provided, in which computer-executable instructions are stored, and the computer-executable instructions are executed by a processor to implement the method for determining the driver of the hardware peripheral according to any one of the first aspect.
The embodiment provides a finite element-based method, a finite element-based device, equipment and a storage medium for checking the immersed tube construction stress of an oil-gas pipeline, wherein the method comprises the steps of establishing a first immersed tube finite element model according to immersed tube parameters, and acquiring a first current maximum stress value of the oil-gas pipeline output by the first immersed tube finite element model; updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model, acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model, and judging whether the pipeline fails; and updating at least part of the immersed tube parameters to obtain a third immersed tube finite element model if the second current maximum stress value and the allowable stress value of the oil-gas pipeline do not pass the checking. The method comprises the steps of verifying a immersed tube finite element model through a historical actual measurement maximum stress value to obtain an accurate model suitable for engineering construction, namely a second finite element model; and judging whether the site construction meets the safety requirements or not through the maximum stress value and the allowable stress value obtained by the calculation of the second finite element model. The method obtains more scientific and accurate immersed tube parameters for a construction site, accelerates the stress checking speed and simultaneously considers the accuracy.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
FIG. 1a is a schematic view of a double-sided one-way immersed tube for immersed tube trenching construction;
FIG. 1b is a schematic view of a double-sided back-to-back immersed tube for immersed tube trenching construction;
fig. 2 is a first flowchart of a finite element-based stress checking method for oil and gas pipeline immersed tube construction provided in the embodiment of the present application;
FIG. 3 is a flow chart of a finite element-based stress checking method for oil and gas pipeline immersed tube construction provided in the embodiment of the present application;
FIG. 4a is D1219 is multiplied by 18.4mm and has, there is bilateral unidirectional immersed tube top stress map of straight-tube section of buttress, not;
FIG. 4b is a diagram of the pipe top stress at D1219X 18.4mm different buttress positions, both sides of which are back to the pipe sinking trench depth of 3.0 m;
FIG. 4c is a three-dimensional graph of the full linear stress values of a D1219 × 18.4mm double-sided unidirectional immersed tube;
fig. 5 is a schematic structural diagram of a finite element-based stress checking device for oil and gas pipeline immersed tube construction provided in the embodiment of the present application;
fig. 6 is a hardware structure diagram of a finite element-based stress checking device for oil and gas pipeline immersed tube construction provided in the embodiment of the present application.
Description of reference numerals:
101-excavator a;
102-excavator B;
103-a pipeline;
104-a pipe trench;
105-excavator C;
106-excavator D.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Fig. 1a is a schematic diagram of a double-sided unidirectional immersed tube in immersed tube sinking construction, and fig. 1b is a schematic diagram of a double-sided back immersed tube in immersed tube sinking construction. As shown in fig. 1a and 1b, the schematic diagram includes: excavator a101, excavator B102, excavator C105, excavator D106, pipeline 103, and trench 104. When the double-sided unidirectional sinking construction is performed, the pipeline 103 is placed at a designated position, the excavator a101 and the excavator B102 excavate the pipe trench 104 on both sides of the pipeline 103, and the excavator a101 and the excavator B102 have the same direction. When the double-sided back sinking construction is performed, the pipeline 103 is placed at a predetermined position, and the excavator a101, the excavator B102, the excavator C105, and the excavator D106 excavate the trench 104 on both sides of the pipeline 103, at which time both the excavator a101 and the excavator B102 have the same direction, both the excavator C105 and the excavator D106 have the same direction, and both the excavator a101 and the excavator B102 have the opposite direction to both the excavator C105 and the excavator D106, and respectively travel to both ends of the pipeline 103. The pipeline 103 is subjected to obvious large-displacement bending deformation in the pipe sinking and ditching process, a high stress state can be generated in the deformation process, local stress concentration is generated on the pipeline 103, plastic deformation failure damage can be caused on the pipeline 103, and the safety and the quality of the pipeline are influenced to a certain extent. When the theoretical data method is used for checking the stress, parameters need to be input manually, so that the labor and the time are wasted, and errors exist.
The application provides a finite element-based method for checking the stress of oil-gas pipeline immersed tube construction, which comprises the steps of establishing an immersed tube finite element model through immersed tube parameters, checking the immersed tube finite element model twice through a historical actual measurement maximum stress value and an allowable stress value to obtain more scientific and accurate immersed tube parameters for a construction site, accelerating the stress checking speed and simultaneously considering the accuracy.
The application provides a finite element-based oil and gas pipeline immersed tube construction stress checking method, which aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 2 is a first flowchart of a finite element-based stress checking method for oil and gas pipeline immersed tube construction provided in the embodiment of the present application. As shown in fig. 2, the method of the present embodiment includes:
s201, establishing a first immersed tube finite element model according to immersed tube parameters, and acquiring a first current maximum stress value of the oil-gas pipeline output by the first immersed tube finite element model, wherein the immersed tube parameters comprise pipeline parameters, soil parameters and construction parameters;
the pipe sinking and ditching refers to a construction method of excavating pipe ditches along a pipeline and slowly sinking the pipeline into the pipe ditches with different depths by utilizing the self gravity of the pipeline. The calculation and check of the stress in the process of sinking the pipe into the ditch of the long-distance pipeline refers to the steps of collecting construction requirements of sinking the pipe into the ditch and detailed parameters in drawing data before the construction is started, carrying out simulation calculation on the stress of the pipeline in the process of sinking the pipe into the ditch to obtain the maximum stress value on the pipeline, and comparing the maximum stress value with the allowable stress value corresponding to the pipeline searched in relevant specifications to ensure that the stress of the pipeline is smaller than the allowable stress value when the pipeline is deformed due to the construction mode of sinking the pipe into the ditch in the field construction, so that the pipeline is ensured not to be subjected to plastic deformation due to the stress, and the pipeline cannot be damaged due to the sinking pipe into the ditch construction.
In the application, the stress change in the pipe sinking process is calculated by establishing a pipe sinking finite element model. The finite element method is a numerical technique for solving approximate solutions of the edge value problem of the partial differential equation, the whole problem area is decomposed during the solution, each sub-area becomes a simple part, and the simple part is called a finite element. In this embodiment, the establishment of the immersed tube finite element model is to establish a mathematical model of the stress when the pipeline is immersed, so as to solve to obtain a simulated maximum stress value. In this embodiment, the finite element model of the immersed tube is established and the solution is completed in the finite element software. The parameters required for establishing the immersed tube finite element model are immersed tube parameters, and the parameters mainly comprise three parameters: pipeline parameters, soil parameters, and construction parameters. The model established according to the initial immersed tube parameters is a first immersed tube finite element model, and the maximum stress value obtained according to the first immersed tube finite element model is a first current maximum stress value.
Optionally, the pipeline parameters include pipe diameter, pipe wall thickness, elbow angle and elbow size; the soil parameters include soil type and friction coefficient; the construction parameters comprise pipe ditch parameters, buttress setting parameters and pipeline additional load.
In this embodiment, the pipeline is bent in the sinking process of the immersed tube, so the pipeline parameters are divided into a straight pipe and a bent pipe. The friction type between the pipeline and the soil is preset as coulomb friction, so that reference data needs to be consulted according to the type and the property of the pipeline foundation soil to determine the soil friction coefficient. The pipe trench parameters in the construction parameters comprise trench depth and trench width, and the arrangement mode and the number of the buttresses. The buttress is placed at the support body that is close to pipeline emergence deformation position, and its effect is that the heat preservation of protection pipeline is not destroyed because of rubbing with soil, the device installation of also convenient hoist and mount. At the same time, the number and location of the piers also has an effect on the pipe stresses. Pipeline parasitic loads refer to forces acting on the pipeline, such as gravity and soil support forces. The above parameters are all set in the finite element software during the modeling process.
Optionally, in this embodiment, the concerned immersed tube finite element model satisfies at least one of the following preset conditions:
if the oil gas pipeline is long enough, the end part of the oil gas pipeline cannot be influenced when the initial ditch descending point descends the ditch;
free constraint is adopted at two ends of the oil and gas pipeline;
in the process of sinking the pipe into the ditch, the supporting action between the oil gas pipeline and the soil body is simulated by adopting a contact unit;
simulating a soil body and a buttress by using a discrete rigid body;
different trench bottom depths generated by excavating the excavator are simulated by moving the soil blocks on the right side downwards.
In this embodiment, predetermine oil gas pipeline enough long at first, the pipeline is in the time of the ditch down like this, and the return bend angle can not be too big, and can neglect with the direct relative slip of soil, does not exert an influence to oil gas pipeline tip promptly. The two ends of the oil and gas pipeline are freely constrained, which means that no constraint condition exists at the two ends of the pipeline.
When finite element software is used, if a part in the model has a much higher rigidity than other parts and a much lower deformation than other parts, it can be defined as a rigid body part. The rigid body part does not deform in the analysis process, and only integral translation and rotation occur. The main purpose of defining a component as a rigid body is to improve computational efficiency and make the analysis more convergent. The discrete rigid body is a rigid body represented by discrete units in the finite element software ABAQUS and can be arranged in any geometric shape. In the embodiment, the discrete rigid body is used for simulating the soil body and the support pier, the soil body and the support pier are represented by discrete units, and the established finite element model is more accurate.
In this embodiment, in order to fully prepare the sinking pipe trenching process, different trench bottom depths are simulated, so that the different trench bottom depths generated by excavating the excavator are simulated by moving the right soil blocks downwards. It will be understood by those skilled in the art that the right soil block is the soil block to be excavated during the pipe sinking operation, and the direction is not limited to the right side.
Optionally, the sinking tube finite element model is a model established by abaqus nonlinear finite element simulation software.
The finite element simulation software is software for performing numerical simulation calculation by adopting a finite element method. abaqus is a powerful engineering simulation suite of finite element software that solves problems ranging from relatively simple linear analysis to many complex nonlinear problems. In this embodiment, abaqus is used as nonlinear finite element simulation software.
Optionally, the oil and gas pipeline body adopts a first-order shear deformation beam unit model in abaqus software.
A beam refers to a rod that is subjected to lateral loads perpendicular to the axis. In the first-order deformation beam unit model, the normal line after deformation is still a straight line and the length is unchanged. In this embodiment, a first-order shear deformation beam unit is used as a base model.
S202, updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model, and acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model;
in this embodiment, the historical measured maximum stress value is obtained from historical field monitoring detection data. In order to optimize a model before a sinking pipe finite element model is used for simulating a construction site, sinking pipe parameters of the model are adjusted according to site construction detection data, so that the adjusted model is closer to the actual construction condition, after a first current maximum stress value and a first sinking pipe finite element model are obtained, the sinking pipe parameters of the first sinking pipe finite element model are adjusted by taking historical site monitoring detection data as a reference, a second sinking pipe finite element model is further obtained, and a second current maximum stress value of an oil-gas pipeline output by the second sinking pipe finite element model is obtained. The model adjusted according to the historical actual measurement maximum stress value is a second immersed tube finite element model, and the maximum stress value obtained according to the second immersed tube finite element model is a second current maximum stress value.
And S203, updating at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil-gas pipeline to obtain a third immersed tube finite element model, wherein the immersed tube parameters of the third immersed tube finite element model are used for guiding a construction site.
In the embodiment, the allowable stress value of the oil and gas pipeline refers to the minimum yield strength of the pipe specified in the construction specification, the maximum stress in the process of descending the pipeline into the ditch is not greater than 80% of the minimum yield strength of the steel pipe specified in the specification, and the minimum yield strength of the steel pipe is only related to the steel grade of the steel pipe, so that the allowable stress value of the oil and gas pipeline can be obtained by looking up the steel grade of the steel pipe. Those skilled in the art will appreciate that in the application scenario of oil and gas pipelines, steel pipes are generally used, and if pipelines made of other materials are used, another method is required to determine the allowable stress value. And after the second current maximum stress value and the second immersed tube finite element model are obtained, judging whether the pipeline is effective under the existing working condition by taking the allowable stress value of the oil-gas pipeline as a reference. And if the checking fails, adjusting the immersed tube parameters of the second immersed tube finite element model, and further obtaining a third immersed tube finite element model. The purpose of obtaining the model is to obtain the parameters of sinking pipe which can guide the construction site. Wherein, the model after the allowable stress value according to the oil gas pipeline is adjusted is a third immersed tube finite element model.
The embodiment provides a finite element-based method for checking the stress of oil and gas pipeline immersed tube construction, which comprises the steps of establishing a first immersed tube finite element model according to immersed tube parameters and acquiring a first current maximum stress value of an oil and gas pipeline output by the first immersed tube finite element model; updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model, acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model, and judging whether the pipeline fails; and updating at least part of the immersed tube parameters to obtain a third immersed tube finite element model if the second current maximum stress value and the allowable stress value of the oil-gas pipeline do not pass the checking. The method comprises the steps of verifying a immersed tube finite element model through a historical actual measurement maximum stress value to obtain an accurate model suitable for engineering construction, namely a second finite element model; and judging whether the site construction meets the safety requirements or not through the maximum stress value and the allowable stress value obtained by calculating the second finite element model. The method obtains more scientific and accurate immersed tube parameters for a construction site, accelerates the stress checking speed and simultaneously considers the accuracy.
Fig. 3 is a flowchart of a finite element-based stress checking method for oil and gas pipeline immersed tube construction according to an embodiment of the present application. As shown in fig. 3, the method of the present embodiment will be described in detail on the basis of the embodiment shown in fig. 2, with respect to the process of measuring the maximum stress value according to the history and checking the finite element model of the immersed tube according to the allowable stress value.
S301, establishing a first immersed tube finite element model according to immersed tube parameters, and acquiring a first current maximum stress value of the oil and gas pipeline output by the first immersed tube finite element model, wherein the immersed tube parameters comprise pipeline parameters, soil parameters and construction parameters;
in this embodiment, S301 is the same as S201 shown in fig. 2, and is not described herein again.
S302, judging whether the first current maximum stress value is matched with the historical measured maximum stress value or not, if not, executing S303, and if so, executing S304;
in this embodiment, in order to make the first immersed tube finite element model closer to the field construction situation, the historically measured maximum stress value in the historical field construction detection data is obtained, and is compared with the first current maximum stress value, and if the first current maximum stress value is not equal to the historically measured maximum stress value, it is indicated that the immersed tube parameter of the first immersed tube finite element model is to be optimized, and therefore, the relevant immersed tube parameter needs to be updated.
S303, updating the soil parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected first current maximum stress value;
in this embodiment, since the pipeline parameters in the historical site construction detection data are fixed, the pipeline parameters cannot be modified, that is, the pipeline parameters and the construction parameters are updated. The friction coefficient in the soil parameter may be a cause that the first immersed tube finite element model is inconsistent with the historical field situation, and therefore the friction coefficient parameter can be modified. In addition, the soil supporting force in the pipeline additional load may be a cause that the first immersed tube finite element model is not in accordance with the historical field conditions, for example, the soil supporting force is changed due to the uneven soil, but the condition is not considered and is further set in the first immersed tube finite element model, so that the soil supporting force can be modified. The modified first current maximum stress value may be obtained by the updated parametric first immersed finite element model, and thereafter it is again returned to S302 to be compared with the first current maximum stress value.
S304, the first current maximum stress value is matched with the historical measured maximum stress value to obtain a second immersed tube finite element model;
and when the first current maximum stress value is consistent with the historical measured maximum stress value, the first immersed tube finite element model is close to the site construction condition at the moment, the optimization is completed, the obtained model is the second immersed tube finite element model at the moment, and the corresponding corrected first current maximum stress value is the second current maximum stress value.
S305, judging whether the second current maximum stress value is smaller than an allowable stress value, if not, executing S306, and if so, executing S307;
in this embodiment, in order to ensure that the pipeline does not exceed 80% of the minimum yield strength of the pipeline, an allowable stress value of the pipeline is obtained and compared with a second current maximum stress value, and if the second current maximum stress value is greater than the allowable stress value, it is indicated that the pipeline subjected to field construction under the existing conditions is failed through checking, the construction and checking of the pipeline subjected to field construction under the existing conditions are unsafe, and related immersed tube parameters need to be updated in order to guide the construction conditions under which the field construction is safe.
S306, updating the pipeline parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected second current maximum stress value;
in this embodiment, the immersed tube trenching construction is not started yet, so that both the pipeline parameters and the construction parameters can be modified, and meanwhile, the soil parameters and the pipeline additional load are optimized for field data and are not optimized again. The pipe diameter, the pipe wall thickness, the bent pipe angle and the bent pipe size in the pipe parameters, and the pipe ditch parameters and the pier setting parameters in the construction parameters may be reasons for the fact that the second current maximum stress value is larger than the allowable stress value of the pipe. Wherein the elbow angle, elbow size, and trench parameters are coupled and affect each other when modified. The second current maximum stress value after the modification can be obtained through the second immersed tube finite element model with the updated parameters, and then the step returns to S305 to compare the second current maximum stress value with the allowable stress value of the pipeline.
And S307, obtaining a third immersed tube finite element model when the second current maximum stress value is smaller than the allowable stress value.
And when the second current maximum stress value is smaller than the allowable stress value, the second immersed tube finite element model is proved to be in accordance with the construction specification at the moment, the checking is completed, the obtained model is the third immersed tube finite element model at the moment, and the immersed tube parameters of the third immersed tube finite element model for guiding the construction can be obtained.
The technical solution of the present application will be described in detail with reference to a specific example.
Firstly, presetting conditions of a finite element model of the immersed tube are as follows: a first-order shear deformation beam unit model in abaqus software is adopted, and the length of a pipe section under the ditch is assumed to be long enough, so that the end part of the pipe section cannot be influenced when a ditch point is initially set under the ditch; calculating free constraints at two ends of the pipe section; in the process of sinking the pipe into the ditch, the supporting action between the pipeline and the soil body is simulated by adopting a contact unit; using a discrete rigid body to simulate a soil body and a buttress (when the buttress exists), and using general contact to define the contact relation of the soil body and the buttress; different trench bottom depths generated by excavating an excavator are simulated by moving the soil blocks on the right side downwards.
And then obtaining pipeline parameters in immersed tube parameters: the material is a steel pipe, the linear elastic material has the density of 7850Kg/m < 3 >, the elastic modulus of 2.05X 105MPa, the Poisson ratio of 0.3, the pipe diameter of 1219mm, the wall thickness of 18.4mm, and the steel grade of X80. The coefficient of friction in the soil parameters was 0.25, and the pipeline load and its loading pattern in the construction parameters are shown in table 1.
TABLE 1
Consulting a steel pipe yield strength calculation method specified in oil and gas transmission pipeline immersed tube gully construction specifications to determine that the allowable stress value of the X80 pipeline is 444MPa; meanwhile, full-line stress data of the pipeline under working conditions such as existence of buttresses and the like are extracted, and the position of the maximum stress of the pipeline is found at the boundary of the pipe ditch, and the maximum stress at the position is the tensile stress of the top of the pipe. The stress data and the checking results of D1219X 18.4mm at different depths of the immersed tube are shown in Table 2. FIG. 4a is a graph of stress values of bilateral unidirectional immersed tube tops of straight tube sections with and without buttresses D1219 × 18.4mm, and FIG. 4b is a graph of stress values of bilateral unilateral immersed tube tops of D1219 × 18.4mm different buttresses with different positions and with depths of bilateral opposite to the immersed tube trench of 3.0 m. Fig. 4c is a three-dimensional graph of D1219 × 18.4mm double-sided unidirectional immersed tube full line stress value, as shown in fig. 4c, the position of the maximum stress of the pipeline is at the top side of the tube at the boundary of the trench.
TABLE 2
The embodiment provides a finite element-based method for checking the stress of oil and gas pipeline immersed tube construction, which comprises the steps of establishing a first immersed tube finite element model according to immersed tube parameters and acquiring a first current maximum stress value of an oil and gas pipeline output by the first immersed tube finite element model; judging whether the first current maximum stress value is smaller than the historical measured maximum stress value or not, if not, updating the soil parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected first current maximum stress value; repeatedly executing the process of updating the soil parameters and the construction parameters until the corrected first current maximum stress value is smaller than the historical actual measurement maximum stress value, and obtaining a second immersed tube finite element model; judging whether the second current maximum stress value is smaller than an allowable stress value or not; if not, updating the pipeline parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected second current maximum stress value; and repeating the process of updating the pipeline parameters and the construction parameters until the corrected second current maximum stress value is smaller than the allowable stress value, and obtaining a third immersed tube finite element model. According to the method, the soil parameters and the construction parameters are updated through the historical actual measurement maximum stress values, the pipeline parameters and the construction parameters are updated through allowable stress values, the parameters of the model are close to the actual conditions as far as possible before the immersed tube finite element model is used, and the verified model parameters are used for guiding construction, so that the possibility of stress plastic deformation of the pipeline in the immersed tube construction process is reduced.
Fig. 5 is a schematic structural diagram of a finite element-based stress checking device for oil and gas pipeline immersed tube construction provided in the embodiment of the present application. The apparatus of the present embodiment may be in the form of software and/or hardware. As shown in fig. 5, a finite element-based stress checking apparatus 500 for oil and gas pipeline immersed tube construction provided by an embodiment of the present application includes a first modeling module 501, a second modeling module 502 and a third modeling module 503,
the first modeling module 501 is used for establishing a first immersed tube finite element model according to immersed tube parameters and acquiring a first current maximum stress value of an oil-gas pipeline output by the first immersed tube finite element model, wherein the immersed tube parameters comprise pipeline parameters, soil parameters and construction parameters;
the second modeling module 502 is configured to update at least part of the immersed tube parameters according to the first current maximum stress value and the historically measured maximum stress value of the oil and gas pipeline to obtain a second immersed tube finite element model, and obtain a second current maximum stress value of the oil and gas pipeline output by the second immersed tube finite element model;
and the third modeling module 503 is configured to update at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil and gas pipeline, so as to obtain a third immersed tube finite element model, where the immersed tube parameters of the third immersed tube finite element model are used in a construction site.
In a possible implementation manner, the second modeling module is specifically configured to:
judging whether the first current maximum stress value is smaller than the historical measured maximum stress value;
if not, updating the soil parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected first current maximum stress value;
and repeatedly executing the process of updating the soil parameters and the construction parameters until the corrected first current maximum stress value is smaller than the historical actual measurement maximum stress value, and obtaining a second immersed tube finite element model.
In a possible implementation manner, the third modeling module is specifically configured to:
judging whether the second current maximum stress value is smaller than an allowable stress value;
if not, updating the pipeline parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected second current maximum stress value;
and repeating the process of updating the pipeline parameters and the construction parameters until the corrected second current maximum stress value is smaller than the allowable stress value, and obtaining a third immersed tube finite element model.
In one possible implementation, the pipeline parameters include pipe diameter, pipe wall thickness, elbow angle, and elbow size;
the soil parameters include soil type and friction coefficient;
the construction parameters comprise pipe ditch parameters, buttress setting parameters and pipeline additional load.
In one possible implementation, the immersed tube finite element model satisfies at least one of the following conditions:
if the oil-gas pipeline is long enough, the end part of the oil-gas pipeline cannot be influenced when a ditch-descending point is started to descend;
free constraint is adopted at two ends of the oil and gas pipeline;
in the process of sinking the pipe into the ditch, the supporting action between the oil gas pipeline and the soil body is simulated by adopting a contact unit;
simulating a soil body and a buttress by using a discrete rigid body;
different trench bottom depths generated by excavating the excavator are simulated by moving the soil blocks on the right side downwards.
In one possible implementation, the oil and gas pipeline body adopts a first-order shear deformation beam unit model in abaqus software.
In one possible implementation, the immersed tube finite element model is a model established by abaqus nonlinear finite element simulation software.
The finite element-based oil and gas pipeline immersed tube construction stress checking device provided by the embodiment can be used for executing the method embodiment, the implementation principle and the technical effect are similar, and the embodiment is not repeated herein.
Fig. 6 is a hardware structure diagram of a finite element-based stress checking device for oil and gas pipeline immersed tube construction provided in an embodiment of the present application. As shown in fig. 6, the finite element-based stress checking apparatus 600 for oil and gas pipeline immersed tube construction includes:
a processor 601 and a memory 602;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored in the memory 602 to cause the electronic device to perform the finite element-based method for stress checking in pipe sinking construction of an oil and gas pipeline as described above.
It should be understood that the Processor 601 may be a Central Processing Unit (CPU), other general-purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor. The Memory 602 may include a high-speed Random Access Memory (RAM), a Non-volatile Memory (NVM), at least one disk Memory, a usb disk, a removable hard disk, a read-only Memory, a magnetic disk, or an optical disk.
The embodiment of the application correspondingly further provides a computer-readable storage medium, wherein a computer executing instruction is stored in the computer-readable storage medium, and the computer executing instruction is used for realizing the finite element-based oil and gas pipeline immersed tube construction stress checking method when being executed by a processor.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A finite element-based method for checking the stress of oil-gas pipeline immersed tube construction is characterized by comprising the following steps:
establishing a first immersed tube finite element model according to immersed tube parameters, and acquiring a first current maximum stress value of an oil-gas pipeline output by the first immersed tube finite element model, wherein the immersed tube parameters comprise pipeline parameters, soil parameters and construction parameters;
updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model, and acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model;
and updating at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil and gas pipeline to obtain a third immersed tube finite element model, wherein the immersed tube parameters of the third immersed tube finite element model are used for guiding a construction site.
2. The method of claim 1, wherein updating at least a portion of the immersed tube parameters based on the first current maximum stress value and a historically measured maximum stress value for the hydrocarbon pipeline to obtain a second immersed tube finite element model comprises:
judging whether the first current maximum stress value is matched with the historical measured maximum stress value;
if not, updating the soil parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected first current maximum stress value;
and repeatedly executing the process of updating the soil parameters and the construction parameters until the corrected first current maximum stress value is matched with the historical actual measurement maximum stress value, and obtaining a second immersed tube finite element model.
3. The method of claim 1, wherein said updating at least a portion of said immersed tube parameters based on said second current maximum stress value and allowable stress values of the hydrocarbon pipeline to obtain a third immersed tube finite element model comprises:
judging whether the second current maximum stress value is smaller than the allowable stress value or not;
if not, updating the pipeline parameters and the construction parameters to obtain new immersed tube parameters, and establishing a new immersed tube finite element model according to the new immersed tube parameters to obtain a corrected second current maximum stress value;
and repeating the process of updating the pipeline parameters and the construction parameters until the corrected second current maximum stress value is smaller than the allowable stress value, and obtaining a third immersed tube finite element model.
4. A method according to any one of claims 1 to 3, wherein the pipe parameters include pipe diameter, pipe wall thickness, elbow angle, and elbow size;
the soil parameters comprise soil type and friction coefficient;
the construction parameters comprise pipe ditch parameters, pier setting parameters and pipeline additional load.
5. A method according to any one of claims 1 to 3, wherein the sinking finite element model satisfies at least one of the following conditions:
if the oil-gas pipeline is long enough, the end part of the oil-gas pipeline cannot be influenced when a ditch-descending point is started to descend;
free constraint is adopted at two ends of the oil and gas pipeline;
in the process of sinking the pipe into the ditch, the supporting action between the oil gas pipeline and the soil body is simulated by adopting a contact unit;
simulating a soil body and a buttress by using a discrete rigid body;
different trench bottom depths generated by excavating the excavator are simulated by moving the soil blocks on the right side downwards.
6. The method of claim 5, wherein the hydrocarbon pipeline body employs a first order shear deformation beam cell model in abaqus software.
7. A method according to claim 1, wherein the sinking tube finite element model is a model created by abaqus nonlinear finite element simulation software.
8. The utility model provides an oil gas pipeline immersed tube construction stress check equipment based on finite element which characterized in that includes:
the first modeling module is used for establishing a first immersed tube finite element model according to immersed tube parameters and acquiring a first current maximum stress value of an oil and gas pipeline output by the first immersed tube finite element model, wherein the immersed tube parameters comprise pipeline parameters, soil parameters and construction parameters;
the second modeling module is used for updating at least part of the immersed tube parameters according to the first current maximum stress value and the historical measured maximum stress value of the oil-gas pipeline to obtain a second immersed tube finite element model and acquiring a second current maximum stress value of the oil-gas pipeline output by the second immersed tube finite element model;
and the third modeling module is used for updating at least part of the immersed tube parameters according to the second current maximum stress value and the allowable stress value of the oil and gas pipeline to obtain a third immersed tube finite element model, wherein the immersed tube parameters of the third immersed tube finite element model are used for a construction site.
9. An electronic device, comprising: a processor and a memory;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored by the memory to cause the electronic device to perform the method of any of claims 1-7.
10. A computer readable storage medium having stored thereon computer executable instructions for performing a finite element based method of stress checking for pipe sinking construction of an oil and gas pipeline as claimed in any one of claims 1 to 7 when executed by a processor.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561371A (en) * | 2012-02-29 | 2012-07-11 | 中交一航局第五工程有限公司 | Steel caisson enclosure structure at island-tunnel combination part |
| CN108086358A (en) * | 2017-12-13 | 2018-05-29 | 中国二冶集团有限公司 | Heavy caliber long range multitube is the same as ditch Immersed tunnel method |
| CN111027240A (en) * | 2019-11-14 | 2020-04-17 | 哈尔滨工业大学（深圳） | Buried pipeline safety assessment method and related equipment |
| RU2748876C1 (en) * | 2020-07-20 | 2021-06-01 | Общество с ограниченной ответственностью "Научно-производственное предприятие "Геотек" (ООО НПП "Геотек") | Method for conducting engineering-geological and geotechnical surveys |
| CN112989525A (en) * | 2019-12-17 | 2021-06-18 | 中国石油天然气集团有限公司 | Checking method for oil and gas pipeline design under melting and sinking action in permafrost |
| CN113152450A (en) * | 2021-04-22 | 2021-07-23 | 广东际安工程管理有限公司 | Application of prestressed concrete pipe pile planting technology in complex foundation |
| CN115130342A (en) * | 2022-06-24 | 2022-09-30 | 中国石油大学(北京) | Model fitting method, strain bearing capacity determining method and device and electronic equipment |
-
2022
- 2022-10-25 CN CN202211307787.7A patent/CN115544702B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561371A (en) * | 2012-02-29 | 2012-07-11 | 中交一航局第五工程有限公司 | Steel caisson enclosure structure at island-tunnel combination part |
| CN108086358A (en) * | 2017-12-13 | 2018-05-29 | 中国二冶集团有限公司 | Heavy caliber long range multitube is the same as ditch Immersed tunnel method |
| CN111027240A (en) * | 2019-11-14 | 2020-04-17 | 哈尔滨工业大学（深圳） | Buried pipeline safety assessment method and related equipment |
| CN112989525A (en) * | 2019-12-17 | 2021-06-18 | 中国石油天然气集团有限公司 | Checking method for oil and gas pipeline design under melting and sinking action in permafrost |
| RU2748876C1 (en) * | 2020-07-20 | 2021-06-01 | Общество с ограниченной ответственностью "Научно-производственное предприятие "Геотек" (ООО НПП "Геотек") | Method for conducting engineering-geological and geotechnical surveys |
| CN113152450A (en) * | 2021-04-22 | 2021-07-23 | 广东际安工程管理有限公司 | Application of prestressed concrete pipe pile planting technology in complex foundation |
| CN115130342A (en) * | 2022-06-24 | 2022-09-30 | 中国石油大学(北京) | Model fitting method, strain bearing capacity determining method and device and electronic equipment |
Non-Patent Citations (5)
| Title |
|---|
| DONG ZHANG: "Field experiment and numerical investigation on the mechanical response of buried pipeline under traffic load", 《ENGINEERING FAILURE ANALYSIS》 * |
| JINXU JIANG: "Fracture response of mitred X70 pipeline with crack defect in butt weld: Experimental and numerical investigation", 《THIN-WALLED STRUCTURES》 * |
| XIAOBEN LIU: "A semi-empirical model for peak strain prediction of buried X80 steel pipelines under compression and bending at strike-slip fault crossings", 《JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING》 * |
| 刘建平: "融沉位移作用下X65管道的应变响应", 《油气储运》 * |
| 季蓓蕾: "软土沉降位移作用下大口径管道轴向应力状态研究", 《中国安全生产科学技术》 * |
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