System and method for evaluating submarine slope instability caused by hydrate decomposition

Abstract

The present invention relates to a system and a method for evaluating submarine slope instability caused by hydrate decomposition. The system is characterized by comprising a pre-processing module, a core calculation module and a post-processing module; the pre-processing module comprises a geometric model module, a material model module, a mechanical model module, a physical grid model module and a hydrate decomposition amount module; the geometric model module builds a geometric model of a submarine slope and sends the geometric model to the physical grid model module and the core calculation module; the material model module builds a material model of the submarine slope and sends the material model to the physical grid model module and the hydrate decomposition amount module; the mechanical model module builds a mechanical model of the submarine slope and sends the mechanical model to the core calculation module and the hydrate decomposition amount module; the physical grid model module builds a physical grid model and sends the physical grid model to the core calculation module; the hydrate decomposition amount module calculates a hydrate decomposition amount and sends the hydrate decomposition amount to the core calculation module; and the core calculation module calculates stability data of the submarine slope and sends the stability data to the post-processing module for display. The system and the method can be widely applied to submarine slope stability evaluation.

Description

technical field [0001] The invention relates to the field of seabed instability mechanism and stability evaluation, in particular to a seabed slope instability evaluation system and evaluation method caused by natural gas hydrate decomposition. Background technique [0002] The decomposition of gas hydrates is considered to be one of the causes of seafloor slides in many continental margins around the world. Theoretical analysis shows that the decomposition of natural gas hydrate increases the gas content in sediment pores, generates excessive pore pressure, and reduces the cementation strength of sediments. If the slope of the hydrate-containing sediment layer is large, and the hydrate decomposition is more significant, the shear strength and bearing capacity of the sediment layer will be reduced, resulting in instability such as submarine slope sliding. At present, the research on seafloor instability caused by hydrate decomposition mainly focuses on discussing the influe...

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Problems solved by technology

The model of the limit equilibrium analysis method is simple and the most widely used, but this method largely depends on the understanding of the shape and soil properties of the potential landslide, and cannot solve the problems of excess pore water pressure, slope deformation, dynamic response and complex Due to the influence of many factors such as terrain, it is impossible to simulate the instability process of the slope, and there are limitations in application.

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