Dynamics of a Pipe System for Hardrock Fracturing in Deep- Ocean Floor

提出了一种新的先进的海底地壳开采管道系统，并进行了数值模拟评价。采矿系统由一艘缓慢连续移动的船组成，该船用采矿振动器或海底运输工具操纵深海管道，以破坏或粉碎地壳矿物。该系统的开发被业界认为是最关键的系统之一，包括船舶振荡和机动运动对管道底端的瞬态特性的分析和控制，海浪和海流的水动力载荷，矿用振动器的激振及破碎矿水混合流与振荡管道运动的动态相互作用。管道系统的瞬态响应由管道弯曲-轴向-扭转的非线性大耦合变形组成。基于离散元法（DEM），建立了全管道系统的三维模型，分析了该耦合管道系统在强震作用下的非线性动力学采矿作业中遇到的作业负荷和环境负荷。

A new advanced mining pipe system for deep-ocean crust mining in ocean floor depths up to 2,500 meters is proposed and to be evaluated by numerical simulation. The mining system consists of a slowly continuous moving ship which maneuvers a deep ocean pipe with a mining vibrator or ocean-floor vehicle to fracture or crush the crust minerals. The development of this system, which has been identified by the industry as one of the most crucial, involves the analysis and control of the transient behavior of the pipe bottom end caused by the ship's oscillatory and maneuvering motion, hydrodynamic loading due to ocean waves and current, mining vibrator excitations, and dynamic interaction of fractured mineral and water mixture flows with oscillating pipe motion. The transient response of the pipe system consists of nonlinear large coupled bending-axial-torsional deformation of the pipe. A three- dimensional model of the complete pipe system based upon the discrete element method (DEM) is to be developed in order to analyze the nonlinear dynamics of this coupled pipe system due to the harsh operating and environmental loads encountered in a mining operation.