CN2606354Y - In-situ pore pressure monitoring device for subsea soil - Google Patents

Abstract

The utility model discloses a monitor for pressure on original bores on earth on sea bottom, which has a length rod and a corresponding data collecting device comprising sleeves, a wimble tip resistance sensor on the front end part, a side rub resistance sensor, and hole hydraulic pressure sensors, which is characterized in that: the utility model comprises a plurality of hole hydraulic pressure sensors arranged on the joint, connected with the sleeves on two ends by the joint, and arranged on the long length rod, and a resistivity sensor is arranged on the joint. The utility model constructed thereout not only can monitor the hole pressure change in the soil body with different depth under wave action, but also can monitor the influence depth of the waves with different size, in order to analyze the stability of the soil body. At the same time, the utility model uses the resistivity sensor to test the resistivity of the soil body with different depth, in order to analyze the corrosion degree of the soil to the seabed pipelines and other engineering arrangements, providing scientific basis for the determining of the imbedment depth.

Description

In-situ pore pressure monitoring device for subsea soil

technical field

The utility model relates to a measuring device for the physical and mechanical properties of the underwater soil body, in particular to an in-situ pore pressure monitoring device for the seabed soil body.

Background technique

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).

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an in-situ pore pressure monitoring device for seabed soil that monitors the excess pore water pressure generated by waves at different depths in the soil body.

Another purpose of the utility model is to monitor the impact depth of waves of different sizes while monitoring the pore pressure in the soil, and to test the resistivity of the soil at different depths to determine the corrosion of the soil to the foundation of pipelines and structures.

On the basis of the existing technology, the device includes a measuring rod composed of the sleeve and the cone tip resistance sensor at the front end, the side friction resistance sensor and the pore water pressure sensor behind it, and the corresponding automatic data acquisition device. But it also includes a plurality of pore water pressure sensors arranged on the long measuring pole with joints alternately; soil resistivity sensors are also arranged on the above-mentioned corresponding joints, so as to measure the resistivity of the soil simultaneously and on site.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the long measuring rod of the present utility model

Detailed ways

The utility model has a measuring rod composed of a sleeve 6, a cone tip resistance sensor 1 at the front end, a side friction resistance sensor 2 and a pore water pressure sensor behind the position thereof, and a corresponding data acquisition device. It is characterized in that it also includes a On the joint 5, a plurality of pore water pressure sensors 3 are arranged on the long measuring rod by connecting the sleeve 6 with the joint 5. These pressure sensors 3 are mainly arranged alternately with the length of the sleeve, which can not only measure the pore pressure in layers, but also The impact depth of waves of different sizes can be monitored. As another embodiment, in addition to installing a pore water pressure sensor 3 on the joint 5, a resistivity sensor 4 can also be installed, so that the field can also measure the soil resistivity parameters at the same time; A terminal joint 7 with a cable hole 8 is provided on the top of the measuring rod, and the cable hole 8 is an outlet of a multi-channel signal cable. The above-mentioned pore water pressure sensor can adopt a piezoresistive sensor with a stainless steel isolation diaphragm, etc., to technically ensure small drift, high precision and fast dynamic measurement.

The utility model thus constructed can not only monitor the pore pressure in soil at different depths under the action of waves, but also monitor the impact depth of waves of different sizes and the resistivity of the soil.

Claims (2)

1, monitoring device is pressed in submarine soil original position hole, the measuring staff and the corresponding data acquisition device that have the pore water pressure sensor behind static point resistance sensor (1), side friction sensor (2) and the position thereof of sleeve (6) and leading section to form, it is characterized in that it also comprises is arranged on the joint (5), and connects and be laid in a plurality of pore water pressure sensors (3) on the long measuring staff with joint (5) sleeve (6).

2, monitoring device is pressed in submarine soil original position as claimed in claim 1 hole, it is characterized in that also installing on joint (5) resistivity sensor (4)

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