A system and method for evaluating the instability of submarine slopes caused by hydrate decomposition

Abstract

The invention relates to a system and method for evaluating the instability of a seabed slope caused by hydrate decomposition, characterized in that it includes a pre-processing module, a core calculation module and a post-processing module; the pre-processing module includes a geometric model module, a material model Model module, physical grid model module and hydrate decomposition module; the geometric model module establishes the geometric model of the seabed slope and sends it to the physical grid model module and core calculation module; the material model module establishes the material model of the seabed slope and sends it to the physical grid The model module and the hydrate dissociation module; the mechanical model module establishes the mechanical model of the seabed slope and sends it to the core calculation module and the hydrate dissociation module; the physical grid model module establishes the physical grid model and sends it to the core calculation module; the hydrate dissociation The module calculates the amount of hydrate decomposition and sends it to the core calculation module; the core calculation module solves the stability data of the seabed slope and sends it to the post-processing module for display. The invention can be widely used in the stability evaluation of seabed slopes.

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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