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

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. ...

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