Seabed lateral deformation and sliding observation device and method

Abstract

The invention provides a seabed lateral deformation and sliding observation device and method. The seabed lateral deformation and sliding observation device comprises an auxiliary ship and a seabed observation system, wherein the auxiliary ship is provided with an offshore drilling rig and a lifting device, and the seabed observation system is provided with a displacement measurement device, a data acquisition sealing cabin and a subsidence prevention frame. The displacement measurement device is of a rod joint combination structure with a cable, each joint point is provided with a three-axis acceleration sensor, and the displacement deviation of each joint point can be calculated according to the posture change of the corresponding three-axis acceleration sensor. The method includes the steps that the auxiliary ship is utilized for drilling a target point position so that the seabed observation system can be arranged, the seabed lateral deformation and sliding are observed and recorded through the displacement measurement device in the seabed observation system, fishing and recycling are conducted after the in-situ observation cycle is ended, and the deformation amount and the deformation process of seabed soil can be obtained by analyzing data. The seabed lateral deformation and sliding observation device and method provide a new thought and a new method for seabed lateral deformation and sliding observation and have the advantages of being long in observation cycle, capable of being repeatedly used, wide in observation range, high in accuracy and the like.

Description

technical field [0001] The invention belongs to the field of marine geological observation, in particular to a seabed lateral deformation and sliding observation device and method. Background technique [0002] During severe sea conditions, strong winds and waves will cause the dynamic accumulation of pore water pressure inside the seabed and the reduction of effective normal stress, which will greatly reduce the shear strength of the seabed soil, causing shear failure and even liquefaction of the seabed soil, resulting in The seabed is laterally deformed and slipped. If the seabed slope is large and the soil strength is low, it may even cause submarine landslides, causing instability and damage to submarine pipelines, breakwaters, and offshore platform foundations. Similarly, factors such as earthquakes will also cause geological disasters such as submarine landslides, causing immeasurable losses to offshore production safety. At present, most studies on seabed damage or e...

AI Technical Summary

Problems solved by technology

However, there are very few patents related to submarine landslide observation. After searching the existing technical literature, it is found that the Chinese patent name: Submarine landslide simulation and observation system production method caused by natural gas hydrate decomposition, patent application number CN201410139109, the invention A deformation measurement unit that can measure the deformation process and amount of soil is proposed, which can describe the landslide deformation quantitatively. However, this invention belongs to the category of physical simulation experiments, and its portability is poor, so it cannot meet the needs of in-situ observation.

Therefore, in the technical field of in-situ observation of lateral deformation and sliding of seabed soil, my country still does not have technology and equipment with its own independent intellectual property rights. This has always been a technical problem in in-situ observation of seabed landslides. One vacancy, promote the development process of marine engineering geological disaster prevention and control in China, and ensure the safe production of submarine pipelines, ports, marine infrastructure, etc.

Images