深海采矿立管在波流载荷下的弯矩响应分析

采矿立管是深海采矿系统的重要组成部分，立管的弯矩分析是确保立管正常使用的重要指标。立管所处海洋环境复杂，且立管底部的自由边界条件使得立管弯矩特性难以分析。本文基于波浪理论，使用Abaqus 有限元软件建立海洋采矿立管的模型，运用Abaqus中的AQUA海洋工程模块，考虑立管在轴向力、自重、浮力、波浪载荷、海流载荷及模拟海上平台水平和升沉运动共同作用下，对采矿立管进行弯矩分析，计算了提升泵不同安装位置、不同中继仓重量变化对弯矩的影响，结果表明：提升泵会增大安装位置的弯矩幅度，且安装在不同位置对立管弯矩会产生叠加影响；中继仓重量的增加提高了立管整体稳定性，但会使提升泵处弯矩波动产生向中部延伸的不利影响。

Analysis of Bending Moment Response of Deep Sea Mining Riser under Wave and Current Loads

The Mining risers are an important part of deep-sea mining systems, and bending moment analysis of risers is an important indicator to ensure the normal use of risers. The complex marine environment in which the riser is located and the free boundary conditions at the bottom of the mining riser make it difficult to analyze the bending moment characteristics of the riser. Based on wave theory, the model of offshore mining riser is established by using Abaqus finite element software, and the AQUA offshore engineering module in Abaqus is used to analyze the bending moment of the mining riser under the combined action of axial force, self-weight, buoyancy, wave load, ocean current load and simulated horizontal and heaving motion of offshore platforms, and the influence of weight changes of different installation positions and different relay silos on the bending moment of the lifting pump is calculated, and the results show that the lifting pump will increase the bending moment amplitude of the installation position, and the installation position will have a superimposed effect on the bending moment of the riser. The increase of the weight of the relay silo improves the overall stability of the riser, but it will cause the bending moment fluctuation at the lifting pump to have the adverse effect of extending to the middle, which provides a theoretical basis for actual production.