Three-dimensional visualization test device and method for seabed deformation induced by hydrate decomposition

Abstract

The invention provides a three-dimensional visualization test device and method for seabed deformation induced by hydrate decomposition. The device comprises a transparent model box, a deposition layer is arranged in the transparent model box, a laser device and a CCD camera are arranged on the side face of the transparent model box, a laser displacement meter is arranged at the top of the transparent model box, and a temperature sensor and a pressure sensor are further arranged in the deposition layer; the deposition layer comprises a transparent marine soft clay layer and a natural gas hydrate layer; wherein the transparent marine soft clay layer is prepared by mixing and stirring lithium magnesium silicate and distilled water according to a mass ratio of 3.5-6.5: 100, and the natural gas hydrate layer is prepared by Trichlorofluoromethane and distilled water according to a volume ratio of 1: 2-1: 4 under normal pressure. According to the invention, the seabed response under the natural gas hydrate decomposition condition, the fluid migration path in the seabed sediment, the crack propagation in the soil body and other visible eyes can be simulated under normal pressure, and a three-dimensional displacement field can be obtained through image processing.

Description

technical field [0001] The invention relates to the technical field of marine geology, in particular to a three-dimensional visualization test device and method for seabed deformation induced by hydrate decomposition. Background technique [0002] Gas hydrates mostly exist in sediment pores under low-temperature and high-pressure environments on the seabed. When the seabed temperature rises or pressure decreases, gas hydrates decompose into gas and water, resulting in an increase in pore pressure. As pore pressure builds up, seabed deformation occurs, such as seabed heaving. At the same time, the decomposition of natural gas hydrate leads to a gradual decrease in the cementation strength and effective stress of the sediments. Under the triggering action of external forces such as earthquakes, submarine landslides are extremely prone to occur. [0003] At present, the research on the seabed deformation induced by the decomposition of natural gas hydrate is mainly based on ma...

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Problems solved by technology

[0005] The present invention proposes a three-dimensional visualization test device and method for hydrate decomposition-induced seabed deformation, which solves the problem of inability to visually observe the three-dimensional displacement changes of the fluid migration path inside the soil and the crack propagation inside the soil in the prior art, The natural gas hydrate substitute of the present invention can carry out the physical model test under normal pressure, which simplifies the test conditions

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