Analysis of the Structure Suffered Submarine Landslides Using SPH and CEL Methods

Abstract

Study shows that the submarine landslides have greatly affect the stability and security of subsea production systems, subsea pipelines and other Marine structures. Landslides can also take place even though the slope Angle is less than 1 °. At present the study of onshore landslide is more, but the study of submarine landslides are very few.The landslides mainly deal with the issues of stability. The analysis of landslide stability mainly use the Galerkin method, discrete element method, SPH and so on.But there is less research on the influence of the subsea structures.When the landslide occurs, Fluid characteristics of the landslide are significant, the soils translate into mudflow or debris flow,which is not solid state but fluid.So both SPH and CEL can be used for simulation, this paper uses the CEL and SPH to study the submarine landslide, the comparative analysis of the advantages and disadvantages of both methods is taken on. Both motheds are introduced at fisrt, Then through calculation, compares the two kinds of calculation methods. It can be seen that the SPH method and the CEL method are basically consistent with the shape of the landslide mass.It shows that both methods are feasible. The results of CEL method is more accurate.When the number of elements of SPH and CEL is few, the calculation time of SPH is shorter than that of CEL, but with the increase of element number, the calculation of the CEL method is more faster. If stress value of Lagrangian structure is required,it is better to choose CEL method. It is useful to further study on submarine landslides on Subsea structures.