Pore pressure observation device for recognizing seabed interface based on natural potential method and working method

Abstract

The invention provides a pore pressure observation device for recognizing a seabed interface based on a natural potential method and a working method, and the device comprises a pore water pressure observation system, a seabed interface recognition system, a collection and power supply system, and a support and penetration system. Through the technical scheme, the problem that follow-up pore pressure data processing is affected due to the fact that the position of a pore water pressure sensor buried in a seabed from the seabed cannot be accurately obtained due to large elevation change of a seabed interface caused by erosion and deposition of the seabed under an extreme sea condition is solved. The attitude sensor is used for acquiring seabed interface elevation change data caused by seabed erosion or deposition, and the attitude sensor is used for correcting the problem that the preset penetration depth cannot be reached due to inclination of the probe rod, so that the problem that the penetration difficulty of the pore pressure probe rod is high is solved; penetration and recovery can be achieved only by conducting special machining on the local drill bit and the top of the collecting cabin, cost is saved, and use and transportation are convenient.

Description

technical field [0001] The invention relates to the technical field of seabed pressure observation, in particular to a pore pressure observation device for identifying seabed interfaces based on a spontaneous potential method. 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 pore pressure. Under the cyclic loading of waves, the pore pressure inside the seabed sediments will continue to change dynamically, and the accumulation of pore pressure will lead to a decrease in effective stress, which will liquefy the seabed, thereby inducing geological disasters such as seabed deformation and landslides, and may Leading to accidents such as the instability and collapse of offshore oil platforms and the rupture of submarine pipelines. In-situ observations using pore pressure devices can theoret...

AI Technical Summary

Problems solved by technology

However, changes in the seabed interface will cause a large difference between the preset depth of the pore pressure sensor and the actual depth, which will cause great errors in the study of specific scientific issues such as the depth of seabed liquefaction through pore pressure data.

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