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Simulation method and device for detecting lateral stability of directly laid pipes on sea floor

A simulation device and simulation method technology, applied in the fields of marine soil mechanics, offshore engineering, and submarine pipeline engineering, can solve problems such as horizontal displacement of pipelines, breakage of pipeline lines, loss of stability, etc.

Inactive Publication Date: 2008-07-16
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the lateral resistance provided by the soil is not enough to balance the drag force caused by the ocean current, the pipeline will generate horizontal displacement and lose stability. Can cause pipeline breakage accidents

Method used

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  • Simulation method and device for detecting lateral stability of directly laid pipes on sea floor
  • Simulation method and device for detecting lateral stability of directly laid pipes on sea floor

Examples

Experimental program
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Effect test

Embodiment 1

[0019] As shown in Figure 1, the simulation device of the present invention to detect the lateral stability of the straight-laid pipeline on the seabed includes a soil tank and a soil sample preparation system 1, a mechanical loading system 2, and a parameter measurement system 3, wherein the soil tank and the soil sample preparation system 1 include Soil tank 11 and soil body 12, soil tank 11 is made of transparent toughened glass, so as to observe the state of the pipeline during measurement; soil body 12 is made of sandy soil sample prepared by sand rain method, thereby better simulating Sand seabed mechanical loading system 2 includes stepper motor 21, automatic fine-tuning device 25, stay rope 22, model pipeline 23, and simulation pipeline 23 is two ends free in the present embodiment, and pipeline center is provided with central axis 24, and this pipeline When the instability occurs, both translation and rolling occur; the automatic fine-tuning device 25 is provided with ...

Embodiment 2

[0022] In this embodiment, the simulated pipeline 23 is provided with an anti-roll device of a double parallelogram mechanism 26 , and under the constraints of the double parallelogram mechanism 26 , the simulated pipeline 23 can only move. Other simulation devices and methods in this embodiment are the same as those in Embodiment 1.

[0023] For the simulation method and its simulation device for detecting the lateral stability of the seabed straight-laying pipeline of the present invention, the hydrodynamic force of the ocean current can be simulated by the pulling force applied by the stepper motor 21 and the stay rope 22, and the output torque of the motor can be changed or the stay rope can be changed. 22 and the horizontal plane of the soil to change the tension value, usually the range of the angle between the stay rope 22 and the horizontal plane of the soil is between 40° and 60°. The weight (unit length) of the simulated pipeline 23 is realized by increasing or decre...

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Abstract

The invention discloses a simulation method for detecting the side direction stability of a directly paved submarine pipeline and a simulation device; the invention firstly prepares a soil sample to simulate a seabed, mounts a test pipeline, releases the pipeline to lead the pipeline to generate initial sedimentation under the action of self-gravity when the pipeline is just contacted with the seabed and simultaneously adopts a laser displacement sensor to measure the initial sedimentation amount of the pipeline in a soil body, applies an incline pull to the pipeline through a stepping motor to simulate the actions of a horizontal daggling force and a vertical lifting force of a sea flow to the pipeline, and simultaneously measures the pull of the stepping motor, a horizontal displacement and an additive sedimentation amount during the side direction destabilization process of the pipeline, a displacement field of the soil body at the lower side during the side direction destabilization process of the pipeline, and a soil pressure of the side direction. The utilization of the simulation method and the simulation device of the invention can effectively simulate a bearing soil body, the horizontal dragging force and the vertical lifting force of the single-direction sea flow to the pipeline, etc., of the directly paved submarine pipeline and can monitor the stability parameters like the limit side direction soil resistance of a pipeline foundation in real time, thus being capable of simulating the side stability of the directly paved submarine pipeline.

Description

technical field [0001] The invention relates to the fields of offshore engineering, marine soil mechanics and submarine pipeline engineering, in particular to a simulation method and a simulation device for detecting the lateral stability of a straight-laid pipeline on the seabed. Background technique [0002] Submarine pipeline is an effective tool for transporting oil and gas in the process of offshore oil development. Under the ocean current load, the submarine pipeline will be subjected to the hydrodynamic effects of horizontal drag force and vertical lift force; at the same time, the pipeline will also be subjected to the combined effect of its own gravity, the vertical support force provided by the soil below it, and the lateral resistance. When the lateral resistance provided by the soil is not enough to balance the drag force caused by the ocean current, the pipeline will generate horizontal displacement and lose stability. It can cause pipeline breakage accidents. ...

Claims

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Application Information

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IPC IPC(8): G01M19/00G01B11/00F17D5/00G01M99/00
Inventor 高福平闫术明吴应湘赵波雒承才
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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