A Method for Analyzing Dynamic Coupling of Pipe and Soil

Abstract

The invention discloses a pipe-soil dynamic coupling analysis method, which comprises the steps of establishing a pipe-soil dynamic coupling analysis model, determining the nonlinear hysteresis loop of the soil according to the maximum depth of the pipe structure embedded in the soil, and the like. Its advantage is that it considers the undrained shear strength of the seabed mud surface, the vertical increment of the undrained shear strength of the soil, the shape of the pipe trench, the surface roughness of the pipe structure, and the nonlinear hysteresis effect of the soil. According to the position and direction of movement of the pipeline structure, the support stiffness and soil damping coefficient of the seabed soil to the pipeline structure are determined, and the maximum depth embedded in the soil is updated in real time according to the movement of the pipeline structure, so as to establish A new analysis method for pipe-soil dynamic coupling, which solves the problem of dynamic coupling between pipeline structures and seabed soil, and provides information for the dynamic coupling between submarine pipelines, catenary risers and other pipeline structures and seabed soil. An effective analysis approach and a reliable theoretical basis have been established.

Description

technical field [0001] The invention relates to a research method for pipe-soil coupling effect, more specifically, the invention relates to an analysis method for researching the dynamic coupling effect of pipe structure and seabed soil. technical background [0002] In recent years, as people gradually increase the exploitation and utilization of marine resources, pipeline structures such as submarine pipelines and catenary risers have been more and more widely used in marine engineering. [0003] The submarine pipeline can efficiently and quickly transport oil, natural gas and other energy substances produced by the submarine oil well to the land, and has the advantages of convenient installation, low cost, and efficient transportation. It is the main device for the transportation of submarine oil and gas resources, and it is also The main arteries of the system. However, due to the undulating seabed topography and the scouring of the seabed currents, it is easy to cause...

AI Technical Summary

Problems solved by technology

[0010] The existing technology has made a lot of simplifications for the dynamic coupling effect of the pipe and soil. In the analysis and research of it, linear springs or nonlinear springs are generally used to simulate the effect of the seabed soil on the pipe structure, but the effect of the seabed soil on the pipe structure is not considered. Properties, properties of the pipeline structure and properties of the interaction between the pipeline structure and the subsea soil, such as: shear strength of the subsea soil, soil adsorption effects, surface roughness of the pipeline structure, pipeline groove shape and soil nonlinear hysteresis and many more

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