Liquefaction prevention method of offshore wind power jacket liquefaction prevention suction cylinder device

Abstract

The invention relates to a liquefaction prevention method of an offshore wind power jacket liquefaction prevention suction cylinder device. The suction cylinder device comprises a plurality of suction cylinder bodies arranged on the periphery of the lower end of a jacket, wherein a plurality of vertically distributed first pressure sensors are arranged on the outer side end faces of the suction cylinder bodies, a plurality of second pressure sensors are arranged at the lower end positions of the suction cylinder bodies, drainage holes communicating with a cavity are formed in the upper ends of the suction cylinder bodies, an extrusion assembly is arranged at the upper end position of the inner side of the cavity, a plurality of conduction pipes are arranged in the suction cylinder bodies, one ends of the conduction pipes are located at the upper end position of the inner side of the cavity, the other ends of the conduction pipes are located at the lower end positions of the suction cylinder bodies, and vacuum pumps are connected to the conduction pipes. The liquefaction prevention method has the following beneficial effects that efficient and rapid liquefaction prevention under the limit environment is achieved, and therefore the building stability of the jacket is guaranteed.

Description

Technical field: [0001] The invention relates to the field of offshore wind power, in particular to an anti-liquefaction method for an offshore wind power jacket anti-liquefaction suction cylinder device. Background technique: [0002] In the case of increasing energy shortage, offshore wind power is developing rapidly as a clean and renewable energy source. As the support system of offshore point units, the foundation of the wind turbine is responsible for the wind load transmitted by the transitional connection section of the foundation and the wave load and water flow load received by itself. And the transfer of berthing force and impact force to the foundation soil plays a very important role in ensuring the safety of offshore wind power foundation. The jacket foundation is an important foundation form of offshore wind turbine foundation. The suction cylinder structure at the lower end of the jacket foundation is used as the anchor foundation to fix the entire wind power...

AI Technical Summary

Problems solved by technology

However, whether it is the pore water in the suction cylinder foundation or the seabed coating outside the suction cylinder foundation, it is difficult to quickly remove these pore water by pumping water, so it is impossible to quickly reduce the pore water pressure value in the seabed soil;

[0004] Secondly, when encountering an extreme environment, such as marine seismic waves, because the upper mud layer inside the suction cylinder body is not only subjected to the lateral force of the suction cylinder wall, the existence of the sealing surface on the top of the suction cylinder body blocks the flow of pore water from being discharged outwards. path, this part of the pore water is concentrated inside the suction tube body and cannot be dissipated in time. Under the action of seismic wave load, the application of seismic waves at this time significantly increases the pore water pressure of the seabed mud layer, the shear resistance of the seabed mud layer decreases, and the shear deformation Accumulation causes the mud layer to settle, and the lower end of the suction cylinder body is open, and the pore water has good fluidity. The position where the lower end of the suction cylinder body contacts the flowing liquefied mud layer has plastic damage, and the lower end of the suction cylinder body is deformed in a fan shape. Therefore, the double-wall suction cylinder foundation for automatic prevention and control of liquefaction only plays a preliminary role in preventing liquefaction in non-limit environments, and cannot achieve efficient prevention and control of liquefaction in extreme environments.

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