深海采矿扬矿管受海浪、海流及采矿船的拖航作用产生大偏移 .将扬矿管简化为梁单元 ,建立了几何非线性有限元模型 ,分析了液动力的计算方法 ,给出了增量平衡方程以及New mark迭代方法 .分析了采矿船在变速条件下扬矿管的偏移构型、运动速度、加速度及弯曲应力 .扬矿管底端 (即缓冲矿仓处 )偏移位移达 319 0 2m ,扬矿管在顶部弯曲应力达 13 10 34MN/m2 . The deep-sea mining pipe is greatly offset by the dragging of the ocean waves, ocean currents and the mining vessel, the pipelines are simplified as the beam elements, the geometric nonlinear finite element model is established, the calculation method of the hydrodynamic force is given, Incremental equilibrium equation and Newmark iteration method, the migration configuration, moving speed, acceleration and bending stress of the mining pipe under variable speed are analyzed.The offset displacement of the bottom of the pipe (ie the buffer ore bin) Up to 319 0 2m, the pipe bending stress at the top reached 13 10 34 MN / m 2.