Deep-sea floor pore water pressure long-term observation automatic laying system and deep-sea floor pore water pressure long-term observation automatic laying method

Abstract

The invention discloses a deep-sea floor pore water pressure long-term observation automatic laying system and a deep-sea floor pore water pressure long-term observation automatic laying method. The system comprises an automatic lifting pore pressure meter, a underwater acoustic / long wave communicator, a ship-borne controller and a laying apparatus; the automatic lifting pore pressure meter orderly comprises a lower drill, a balance weight, a master control cabin, a floating body material, an upper drill and a protective rest from bottom to top; the underwater acoustic / long wave communicator and the ship-borne controller are used for controlling the automatic lifting pore pressure meter. A laying bracket and the automatic lifting pore pressure are sent into the seabed surface through a hook while laying; the lower drill begins drilling hole to enter sediment, and the stops running after arriving a set depth; and then the hook is packed up through a cable to finish the laying. When the system is used for recycling, a releaser is started through the emission of a control signal, parts of the automatic lifting pore pressure meter except the lower drill and the balance weight thereof are separated so that the automatic lifting pore pressure meter is floated, and recycled. The repeated laying-recycling of a complex deep-sea instrument is avoided, the working efficiency is improved, the research cost is lowered, and the artificial disturbance on the field search environment in the laying-recycling process is avoided.

Description

technical field [0001] The invention relates to an automatic deployment system and method for long-term observation of deep seabed pore water pressure, belonging to the technical field of marine observation and the field of marine engineering geology. Background technique [0002] Pore ​​water pressure (hereinafter referred to as pore pressure) refers to the pressure of groundwater in soil or rock, which acts between particles or pores, and is divided into static pore pressure and excess static pore pressure. Pore ​​pressure plays a very important role in subsea soil especially in sandy seabed. At present, it is known that the change of seabed pore pressure will cause many liquefaction damage phenomena, such as the subsidence of silt seabed, pit, silt flow and excessive scour around the foundation of structures causing the sinking of oil pipe racks and so on. Using the pore pressure observation system for in-situ observation can theoretically obtain the most authentic and r...

AI Technical Summary

Problems solved by technology

Traditional methods amplify the pore water environment, and even change it into an open environment, making the acquisition results unable to represent the target characteristics, or even meaningless

At present, there is no generally accepted method in the industry to solve this problem.

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