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Method for determining stress deformation of pipeline caused by soil loss below buried pipeline under action of overlying load

A determination method and technology of buried pipes, applied in the direction of instruments, electrical digital data processing, computer-aided design, etc., can solve the problems of single stress factors of pipelines, and do not mention the influence of pipeline stress deformation, etc., to achieve the effect of ensuring accuracy

Active Publication Date: 2020-04-10
NINGBO UNIV
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Problems solved by technology

[0011] In the above studies, the consideration of the force factors of the pipeline is too single, and only the influence of the overlying load on the pipeline or the influence of the soil loss below the pipeline on the pipeline is studied. At present, no factors that can comprehensively consider the overlying load and soil loss on the pipeline have been proposed. The method affected by force deformation

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  • Method for determining stress deformation of pipeline caused by soil loss below buried pipeline under action of overlying load
  • Method for determining stress deformation of pipeline caused by soil loss below buried pipeline under action of overlying load
  • Method for determining stress deformation of pipeline caused by soil loss below buried pipeline under action of overlying load

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[0059] Example: A method for determining the force and deformation of pipelines based on soil loss under buried pipelines under the action of overlying loads, including the following steps:

[0060] 1) Through the pipe-soil coupling example, the length, width and height of the soil are 5m, 1m, and 2.4m respectively, the length of the pipeline is 5m, the diameter of the pipe is D=0.12m, the thickness of the pipe wall is 0.002m, and the distance between the pipeline and the soil surface is h= 0.5m, pipe-soil separation zone length l 1 = 0.373m. Taking soft soil as an example, the soil parameters are taken, and the density ρ=1400kg / m 3 , elastic modulus E=5MPa, Poisson's ratio υ=0.3, bending stiffness EI=1032N·m 2 . Pipeline density ρ=800kg / m 3 , elastic modulus E = 800MPa, Poisson's ratio υ = 0.45. The surface load is located directly above the pipeline, the length l and width b are both 0.4m, and the load is a uniform load of 7.620KPa. The calculation model is as follows ...

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Abstract

A method for determining stress deformation of a buried pipeline due to loss of soil below the buried pipeline under the action of an overlying load comprises the following steps: according to stresscharacteristics of the buried pipeline from stress balance to unbalance, extracting the pipeline and the soil to construct a pipe-soil coupling model for analysis; on the basis of an angular point method and a Winkler elastic foundation beam theory, a pipeline stress deformation equation is given, and displacement, shearing force and bending moment of the pipeline are calculated. The accuracy of the calculation result is ensured, and the limitation that the calculation result cannot correctly reflect the stress characteristics of the pipeline in the actual engineering due to the fact that thetraditional method considers too single pipeline stress factor is overcome.

Description

technical field [0001] The invention belongs to the technical field of engineering, and relates to a method for quantitatively calculating the force and deformation of the pipeline based on the loss of soil below the buried pipeline under the condition of overlying load, in particular, the invention is based on the corner point method and the Winkler elastic foundation beam theory, The detachment section between the pipe and the surrounding soil is divided into the pipe-soil separation area and the pipe-soil semi-separation area, and the calculation method for the displacement, shear force and bending moment of the pipeline is determined, and then a solution to the overlying load in the actual project is proposed. The technical solution for the stress and deformation of pipelines under the joint action of soil loss and soil loss provides a reference for the protection measures and safety analysis of buried pipelines. Background technique [0002] As a means of transportation...

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Application Information

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IPC IPC(8): G06F30/20G06F119/14G06F113/14
Inventor 雍睿梁渭溪侯钦宽曹泽敏倪芃芃李长冬
Owner NINGBO UNIV
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