Offshore in-situ vane shear test system and method

Abstract

The invention relates to an offshore in-situ vane shear test system and method and aims to provide an offshore in-situ vane shear test system and method. The offshore in-situ vane shear test system and method is characterized in that: a ship or an offshore platform is provided, wherein a drilling machine and a propelling device are arranged on a deck of a ship or an offshore platform, a verticallydownward casing pipe is further installed on the deck, a protective pipe connected with the drilling machine and the propelling device is coaxially inserted in the casing pipe, a drill bit is arranged at the lower end of the protective pipe, and a clamping and locking device capable of being used for clamping an integrated cross plate coaxially arranged in the protective pipe is arranged at the bottom in the protective pipe. The system and method is suitable for the field of ocean engineering investigation.

Description

technical field [0001] The invention relates to an offshore in-situ cross plate shear test system and method. Applicable to the field of marine engineering survey. Background technique [0002] As an in-situ test method suitable for soft soils such as silt and silty clay, the cross-plate shear test has a very mature technology and is widely used in land soft soil exploration. With the rapid development of my country's ocean engineering in recent years, static sounding, dynamic sounding, wave velocity and other offshore in-situ testing technologies have been maturely used, but the development of offshore cross-plate shear testing is relatively backward, and traditional equipment and methods are only It can be used in extremely shallow waters such as intertidal zone and near shore. [0003] Marine projects represented by offshore wind farms have gradually shifted from near seas to far seas. Especially in the sea area of ​​Zhejiang Province, the bearing layer is deeply buried,...

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Problems solved by technology

[0004] The offshore cross-plate shear test uses the marine integrated cross-plate shear instrument, which integrates the power device and the plate head, and connects the host computer through a cable for control testing. The traditional test method is to use the static penetration penetrometer. The cross-plate shearing instrument was continuously pressed into the seabed soil layer for testing. During the actual testing process, many problems were found: ①The test depth is shallow, and it cannot continue to press down when encountering silt or silt interlayers, and deep soft soil cannot The test did not meet the depth requirements of the survey and test; ②The head of the cross plate is cross-shaped, and the inclination direction cannot be adjusted. Continuously pressing in, the inclination increases rapidly, and the plate head is easy to break and bend. The board head was damaged only after taking it out; ③The inclination of the board head affects the test results, especially when the board head is bent, the deviation of the test results is large

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