Detector for soil-body in-situ hole pressure and affecting depth under wave action

Abstract

Under the action of waves, the in-situ pore pressure and impact depth monitoring device of the soil has a measuring rod composed of a sleeve, a cone tip resistance sensor at the front end, a side friction resistance sensor and a pore water pressure sensor behind its position, and a corresponding data acquisition device. The utility model is characterized in that it includes a plurality of pore water pressure sensors arranged on the joint and arranged on the long measuring rod by connecting sleeves at both ends with the joint, and a resistivity sensor is also installed on the joint. The invention thus constructed can not only monitor the variation of pore pressure in soil at different depths under the action of waves, but also monitor the impact depth of waves of different sizes, so as to analyze the stability of the soil. At the same time, the resistivity sensor is used to test the resistivity of soil at different depths, so as to analyze the corrosion degree of soil to submarine pipelines and other engineering facilities, and provide a scientific basis for the determination of its embedding depth.

Description

technical field [0001] The invention relates to a measuring device for the physical and mechanical properties of the underwater soil, in particular to a monitoring device for the in-situ pore pressure and impact depth of the soil under the action of waves. Background technique [0002] Wave periodic loads generate excess pore water pressure (referred to as pore pressure) in the soil, but the cumulative pore pressure exceeds the effective stress on the soil, and the soil will become unstable and geological disasters will occur. Hazards caused by normal construction and operation of the project. The existing static penetrating sounding and pore water piezometer equipment are widely used in offshore soil classification, stratification and pore pressure monitoring of dams, but for seabed soil, it is only limited to surface pore pressure observation and cannot be layered. It is impossible to detect the impact depth of waves of different sizes; in addition, there is also a lack o...

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Problems solved by technology

[0002] Wave periodic loads generate excess pore water pressure (referred to as pore pressure) in the soil, but the cumulative pore pressure exceeds the effective stress on the soil, and the soil will become unstable and geological disasters will occur. Hazards caused by normal construction and operation of the project

The existing static penetrating sounding and pore water piezometer equipment are widely used in offshore soil classification, stratification and pore pressure monitoring of dams, but for seabed soil, it is only limited to surface pore pressure observation and cannot be layered. It is impossible to detect the impact depth of waves of different sizes; in addition, there is also a lack of on-site soil resistivity parameter determination, which is an important indicator for determining soil corrosion and is closely related to the working life of submarine engineering structures (such as submarine pipelines)

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