Simulation experiment device and method for submarine landslide induced by natural gas hydrate decomposition

Abstract

The invention provides a simulation experiment device and method for submarine landslide induced by natural gas hydrate decomposition, relates to the technical field of marine geological disasters and natural gas hydrate exploitation, and realizes dynamic observation of the submarine landslide process. The device comprises a model box body, a gas injection system, a landslide system, an observation system and a data acquisition and analysis system, the model box body provides a test platform and facilitates observation, the gas injection system simulates the process that natural gas hydrate is decomposed to release a large amount of methane gas through gas injection, and the landslide system is connected with the gas injection system. The landslide system comprises a permeation box, a clay layer and a simulated hydrate layer and is used for simulating a submarine landslide process, and the observation system records the simulated landslide process and monitors strain and stress changes in the landslide process; and the data acquisition and analysis system collects monitoring information of the pressure sensor and the high-speed camera. The device can be used for observing the dynamic process of hydrate-induced submarine landslide, and has the advantages of simplicity and convenience in operation, low cost and the like.

Description

technical field [0001] The invention relates to the technical fields of marine geological disasters and natural gas hydrate exploitation, in particular to a simulation experiment device and method for natural gas hydrate decomposition-induced submarine landslides. Background technique [0002] With the gradual depletion of traditional fossil fuels such as coal and oil, seeking alternative energy sources has become an urgent task facing the world. Since the Soviet Union first discovered natural gas hydrate in the formation in the mid-1960s, the hydrate has come into people's attention because of its extremely high calorific value. With the deepening of research on natural gas hydrate exploitation, many problems have Surfaced, the dissociation of gas hydrates is considered to be one of the important factors leading to submarine landslides. Large-scale submarine landslides not only pose a great threat to marine engineering facilities such as deep-sea drilling, submarine tunnel...

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Problems solved by technology

At present, most of the research on this aspect is mainly qualitative research. In terms of quantitative research, theoretical calculations and numerical simulations largely rely on the understanding of soil properties, and it is difficult to simulate the development process of submarine landslides.

Although physical simulation is a reliable research method, since hydrates can only maintain their state under low temperature and high pressure conditions, it is still difficult to realize the synthesis and decomposition of hydrates in the existing simulation experimental equipment, and it is impossible to simulate natural gas hydration After the material is decomposed, excess pore pressure and uplift force will further lead to the occurrence of landslides, and there are limitations in application

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