Simulation Analysis Of The Influence Of Lateral Friction Resistance On Lifting Force Of Submarine Falling Object

With the implementation of China's "Going to the Sea" strategy,more and more recovery of aerospace devices crashed into the sea,and in addition,deep-sea offshore oil exploration platforms move more and more frequently,so it is very important to study the adsorption force of objects that touch the sea.This paper studies the three components of the adsorption force salvaging process around falling objects on the sea floor: the adhesion between the soil and the bottom of the object,the negative pore water pressure produced in the process of the object being lifted and the side friction resistance produced by the soil and the side of the object,then summarizes the calculation model of the adsorption force.The finite element analysis software FLAC3 D is used to establish the model of the sea bottom falling objects,simulate the fishing process,estimate the range of the lifting force required for fishing the falling objects from the sea bottom mud,and compare the theoretical calculation results with the simulation results to find out the theoretical calculation model suitable for this paper.On this basis,the effects of cohesion and internal friction angle on fishing process are studied.The results show that: the fishing process of each depth is similar,the soil at the center point of the bottom of the plug first falls,and the soil connected with the inner wall of the falling object continues to rise with the falling object;the lifting speed of the falling object at each depth increases with the increase of the lifting force;under the same lifting force,the lifting speed of the falling object decreases with the increase of the depth of the falling object;When the falling object finally lifts off the bottom,the speed of the falling object at different depths of penetration increases with the increase of the lifting force,but the final displacement from the bottom is not much different;the cohesion and the soil outside the falling object are pulled The distance is directly proportional to the distance;the internal friction angle is basically inversely proportional to the falling object's rising speed;when the lifting force is small,the internal friction angle has a large effect on the falling object's rising speed.Under the action of large lifting force,the displacement of falling objects keeps exponential growth regardless of the internal friction angle and cohesion.In summary,the error between the theoretical calculation results and the simulation results is within a reasonable range,which indicates the reasonable effectiveness of the method and provides a useful reference for the formulation of the actual salvage scheme.