19 Mechanics Simulation of Sampling Process by Using Vibrating Seabed Sampler Available to Purchase

Analytical method was used to analyze the drilling and sampling process of the remote-control seabed sampler, which took the dynamic load on the sampling tube and soil strength change caused by vibration into consideration. The effects on penetrating resistance were evaluated which refer to thickness and diameter of sampling tube, friction angle and absorption factor between soil and tube, and penetrating speed. So that a formula to calculate exciting force was gained The simulated results showed that a) drill pressure had an obvious influence on static-pressed penetration depth, but the depth would be small, so other forces should be applied if the shear strength of seabed deposition was great; b) diameter and thickness of sampling tube were of vital importance, they cannot be arbitrarily increased because of the disturbance to sampler and the increase of weight; c) during the drilling process, exciting frequency should be controlled according to the resistance to fulfill the requirement of penetration speed and disturbance degree; The paper gave us a guidance to determine how to design parameters of sampler and to control the drilling parameters.