Marine single pile foundation with sand pile reinforcement foundation

Abstract

The invention relates to a marine single pile foundation with a sand pile reinforcement foundation, and belongs to the field of pile foundations of ocean engineering. The technical scheme adopted by the invention is that a steel pipe pile is sunken in a seabed, the seabed is a soft soil foundation, a reinforcement foundation with a sand pile process is arranged in a local area of the soft soil foundation, and the steel pipe pile is inserted in and penetrates through the reinforcement foundation and is sunken in the soft soil foundation; the reinforcement foundation comprises sand piles and soft soil among the sand piles; the sand piles are uniformly arranged at intervals; and the center longitudinal axis of the reinforcement foundation is consistent with that of the steel pipe pile. Each sand pile comprises a compaction sand pile. With the characteristics of high horizontal bearing capacity, small horizontal displacement of a pile top, small inclination angle of a pile body, high foundation stiffness, and adaption to large horizontal load of an offshore wind turbine, the marine single pile foundation meets the strict requirements of the offshore wind turbine on the foundation horizontal displacement and the pile body inclination angle, and meets the requirement of 'structure+foundation" overall natural vibration frequency.

Description

technical field [0001] The invention relates to the field of pile foundations of marine engineering, in particular to an offshore single pile foundation with high horizontal bearing capacity in soft soil foundations. Background technique [0002] Offshore wind power generation is the focus of development in the field of new energy, and the market prospect is very broad. The fan unit has strict control standards for the horizontal displacement and uneven settlement of the foundation, and the natural vibration frequency of the "structure + foundation" needs to avoid the driving frequency of the external load. At present, the common foundation types of offshore wind turbines include single pile, high pile cap, multi-pod, jacket, gravity type, negative pressure bucket type and floating platform structure. In offshore wind power projects, monopile foundations are widely used because of their advantages such as small footprint, simple structure, quick construction, and low cost; ...

AI Technical Summary

Problems solved by technology

Although steel pipe piles have relatively high bending stiffness, the soil on the foundation surface around the piles can provide limited horizontal constraints.

If a conventional single pile foundation is adopted, increasing the pile diameter, pile length or wall thickness will lead to more material consumption, and the increase in the weight of the single pile will also bring higher construction difficulty, which will increase the foundation cost rapidly and affect the wind farm. power generation benefit

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