重力活塞取样器贯入模型研究

摘要

Studying on gravity piston corer penetration depth has an important effect on improvement of ef-ficiency and safety of equipment.Prediction of penetration depth,which based on seabed sediment type and engineering parameters,was the focus of this kind of study.According to the general structure of gravity piston corer,this study designed and manufactured a weight-changeable gravity corer,and added sediment barrels,trestle and other supporting facilities into the corer.According to control variable method,this study then designed a series of tests for different weights,penetration speeds and sediment types.Results showed that sediment type,weight and penetration speed all play different degrees of influences on pene-tration depths.Based on test data,we revised the existing gravity corer penetration formula a formula.The calculation results by using the revised formula have smaller error and were closer to the real sampling data relative to the original formula.%重力活塞取样器贯入深度研究对于取样效率的提高和仪器安全有着重要影响,根据取样海底沉积物类型及工程参数对取样器可贯入深度进行预判是研究的重点.基于重力活塞取样器结构,设计并制造了重量可调的重力取样器模型,增加了底质桶与支架等配套设施.按照控制变量法分别设计了针对取样器质量、贯入速度及沉积物类型的试验.试验结果表明,底质类型、取样器质量和贯入速度都可以对贯入深度产生不同程度的影响.在现有重力取样器贯入深度公式的基础上,根据本次试验得到的数据对其进行修正.改进后的公式计算结果与原来相比误差更小、更接近于真实取样数据.