Numerical Simulation of Submarine Landslides Caused by Gas Hydrate Decomposition

Submarine landslide is one of the most serious marine geological disasters. The decomposition of gas hydrate is considered to be an important factor leading to submarine landslides. Based on the seismic data of the submarine slope in an area in the north of the South China Sea, the numerical simulation of the submarine landslide caused by the decomposition of hydrate is carried out. Using the seismic attributes obtained from the seismic data inversion in this area and the strength and physical properties of the triaxial test, we can get the porosity and saturation of the soil by Wyllie's velocity-porosity equation. Then using the pore pressures change model, we calculate the sedimentary pore pressure. Finally, with the finite element strength reduction method, the stability of the seabed slope caused by hydrate decomposition is simulated and predicted. The position of the potential sliding surface of the slope and the displacement and stress after sliding are obtained. Using these parameters, we can achieve a preliminary safety assessment for the geological hazards caused by hydrate decomposition in this area. The preliminary safety assessment result will provide technical guidance and prevention reference for potential safety issues in subsequent hydrate mining processes.