Analysis and modelling on coring process of deep-sea gravity piston corer

Abstract

Taken the deep-sea gravity-piston corer as the prototype, a model of the corer penetrating was built based on energy conservation and by analysing the coring process. The effects of influencing parameters of the deep-sea gravity-piston corer on the penetration process and coring length were analysed. In addition, a comparison between the calculated values and the real examples was performed. The results show that corer weight, sediment properties and penetration velocity affect the coring performance. The penetration depth significantly increases with an increase in corer weight, and the corer weight plays an important role in the process of the corer penetrating. Moreover, the penetration depth decreases with the friction coefficient of increasing sediment, while it gradually increases with an increase in penetration velocity. It is also revealed that the penetration depth decreases approximately linearly as the core barrel diameter. Consequently, these will provide the basic data for the design and optimisation of deep-water gravity-piston corer.

Keywords

• oceanographic regions
• sedimentation
• pistons
• sediments
• friction
• deep-sea gravity piston corer
• deep-water gravity-piston corer
• penetration depth
• penetration velocity
• corer weight
• penetration process
• deep-sea gravity-piston corer
• coring process
• corer penetrating