Safety coefficient calculation method for seabed slope stability

Abstract

The invention discloses a safety factor calculation method for seabed slope stability. The safety factor calculation method comprises the steps of acquiring and calculating wave characteristic parameters and seabed soil mass strength parameters of a sea area; establishing a numerical model based on the wave power characteristics and the soil body strength parameters; analyzing the wave field dynamic model and the seabed slope numerical model based on numerical wave generation and a finite element strength reduction method to obtain a slope stability safety coefficient; and acquiring stabilitychange analysis and estimation under a certain slope rate based on different relative positions of waves and slopes. The stability coefficient of the underwater side slope under the wave load can be estimated, and convenience is provided for selection of the construction slope rate of the underwater temporary side slope. The optimized design slope rate is obtained on the basis of different designparameters and calculation working conditions by utilizing the convenience of numerical simulation calculation. When certain safety requirements are met, the earth excavation and backfill amount of the whole foundation trench is reduced, and damage to the seabed natural ecological environment is reduced to a certain extent.

Description

technical field [0001] The invention relates to the technical field of seabed monitoring, in particular to a safety factor calculation method for seabed slope stability. Background technique [0002] The stability judgment of underwater artificial slopes under wave loads is a basic issue that needs to be considered in the construction of offshore projects, such as underwater pipelines, breakwaters and immersed tunnels. The underwater slope instability problem is a common problem in offshore engineering construction, and the occurrence of landslides is often accompanied by the destruction of the slope structure and surrounding structures. The mentioned offshore engineering structures and pre-buried structures are usually placed in the temporary foundation trench after the excavation of seabed sediments after the prefabrication of the dry dock is completed, and then backfilled. [0003] Due to the stress release caused by the foundation trench and underwater slope formed by m...

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Problems solved by technology

[0003] Due to the stress release caused by the foundation trench and underwater slope formed by manual excavation, the newly formed slope is not compacted under the action of waves, currents, and tides, so the stability is correspondingly weak

At the same time, the stability judgment of these temporary artificial underwater slopes has a great influence on the safety and economy of the project.

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