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Method for evaluating resistance of sandy soil on embedded submarine pipeline under action of waves

A submarine pipeline and force technology, which is applied in the direction of using stable torsion to test material strength, using stable shear force to test material strength, measuring devices, etc., can solve the problem of stress release inside pipeline, pipeline material yield, soil damage, etc.

Inactive Publication Date: 2016-03-23
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

[0003] This application provides a method for evaluating the resistance of sandy soil to buried submarine pipelines under the action of waves, which solves the problem that in the prior art, when it exceeds the resistance of the foundation soil, the pipeline will suddenly deform and the internal stress will be released. Technical issues leading to yielding of pipeline material and soil failure

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  • Method for evaluating resistance of sandy soil on embedded submarine pipeline under action of waves
  • Method for evaluating resistance of sandy soil on embedded submarine pipeline under action of waves

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Embodiment Construction

[0020] The embodiment of the present application provides a method for evaluating the resistance of sand and soil to buried submarine pipelines under the action of waves, which solves the problem that in the prior art, when it exceeds the resistance of the foundation soil, the pipeline will suddenly deform and cause internal stress Released, leading to technical problems of pipeline material yield and soil failure.

[0021] The technical solution in the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0022] Prepare soil samples with different relative compactness by obtaining sand samples, and select different initial static stresses for each relative compact soil sample in the soil samples with different relative compactness Ratio, apply different dynamic cycle stress ratios to the soil sample, and control the number of times and loading time of the dynamic cycle to obtain the change law curve of ...

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Abstract

The invention discloses a method for evaluating resistance of sandy soil on an embedded submarine pipeline under the action of waves. The method comprises the steps that soil body samples with different relative densities are prepared by obtaining sandy soil samples; different initial static stress ratios are selected for soil body samples with the corresponding relative densities, different dynamic cyclic stress ratios are applied to the soil body samples, the frequency of dynamic cycle and loading time are controlled, and a dynamic stress-strain change rule curve and a cyclic strength change rule curve are obtained; according to the dynamic stress-strain change rule curve and the cyclic strength change rule curve, a sandy soil dynamic strength-deformation and pore water pressure growth mode theoretical model is established, horizontal force and vertical force are applied to the pipeline, the size of constraint force of a sandy seabed on the embedded submarine pipeline is further obtained according to a load-displacement relationship, and a basic theoretical method is provided for design of embedding the pipeline in the seabed and evaluation of stability.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to a method for evaluating the resistance of sand and soil to embedded submarine pipelines under the action of waves. Background technique [0002] In order to meet the requirements of the production process, the melt in the buried submarine pipeline needs to be subjected to a certain pressure and temperature increase during transportation, so that additional stress will be generated in the steel pipe. When the submarine pipeline is buried in the foundation soil, the resistance of the foundation soil to the pipeline prevents the pipeline from freely deforming and releasing internal stress. As the additional stress continues to accumulate, when it exceeds the resistance of the foundation soil, the pipeline will collapse. Sudden deformation occurs to release the internal stress, and this sudden buckling change can directly lead to the yield of the pipeline material and the ...

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Application Information

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IPC IPC(8): G01N3/00G01N3/22G01N3/24
CPCG01N3/00G01N3/22G01N3/24
Inventor 邓海峰曹文冉刘振纹罗小桥许浩祁磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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