Seabed slope post-earthquake stability analysis method based on in-situ monitoring

Abstract

The invention provides a method for evaluating the stability of a seabed slope under the earthquake action based on in-situ monitoring. The method is used for evaluating the stability of a seabed landslide after an earthquake. By means of the method, under the condition that only a small amount of displacement in-situ monitoring equipment needs to be arranged, according to the displacement monitoring result, the seabed slope earthquake response process under the earthquake action is inverted, the seabed slope potential slip band strength reduction amount is calculated, the shear band expansion theory is combined, and the seabed slope stability after the earthquake action can be judged. The method is economical, feasible and theoretical, and can be used for submarine stability monitoring of ocean engineering such as submarine pipelines, offshore oil and gas platforms, offshore wind power and the like.

Description

technical field [0001] The invention relates to the field of evaluation methods for the stability of submarine slopes, in particular to a method for evaluating the stability of submarine slopes under earthquake action based on in-situ monitoring. Background technique [0002] Earthquakes are an important factor triggering submarine landslides. Submarine landslides seriously threaten the safety of marine engineering facilities such as submarine cables, offshore platforms, and offshore wind power. The tsunami caused by the huge energy released by them will cause immeasurable losses of life and property to coastal residents. Seismic loads lead to shear deformation and accumulation of excess pore water pressure on the submarine slope. After the earthquake, the shear strength of the slope sediment decreases, resulting in the overall instability of the submarine slope. [0003] In-situ monitoring of submarine slope deformation is the most direct means to obtain the slippage of sub...

AI Technical Summary

Problems solved by technology

First, due to the huge scale of the submarine slope, coupled with the high price of in-situ monitoring equipment for seabed displacement, and complicated deployment methods, it is impractical to deploy large-scale monitoring equipment along the slope like land slopes; second, there is a lack of relevant theoretical guidance for monitoring results. Determining whether a submarine landslide will become unstable after an earthquake

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