海底沉积物取样扰动的有限元研究

应用非线性有限元分析方法,对管状取样器取样过程中的沉积物扰动状况进行了研究.建立了取样管与沉积物接触的二维轴对称有限元模型.重点分析了取样时取样管内沉积物的变形、应力和应变状况.有限元分析结果表明了取样管贯入过程中沉积物应力、应变均产生了变化,扰动显著.证实了工程实际中取样所造成的沉积物样品原始层序混杂或弯曲变形、长度缩短等扰动的后果.海底沉积物的低扰动取样样品对于诸多海洋科学研究非常重要.

The finite element research of disturbance of the seabed sediment sampling

The disturbance of seabed sediments in the process of sampling with pipe cores is researched in this paper. A two-dimensional axisymmetric finite element model of sampling tube and sediments is built. It focus on the conditions of stress, strain and deformation in sampling tube when sampling. The finite element analysis results show that the stress and stain of sediments have changed so much in the process of sampling that a significant disturbance takes place. Also, the paper confirms the phenomenon of disturbance of sampling sediments in an actual sampling project. The low-disturbance sampling of seafloor sediments is very important to ocean science researches.