Single-pile foundation of offshore wind power vibroflotation cemented pile reinforced soft soil foundation and construction method

Abstract

The invention provides a single-pile foundation of an offshore wind power vibroflotation cemented pile reinforced soft soil foundation and a construction method. The single-pile foundation comprises a single pile and vibroflotation cemented piles, wherein the vibroflotation cemented piles are arranged around the single pile; the vibroflotation cemented piles are formed in a seabed soft soil layer and a supporting layer through a construction method of combining a deep sea gravel pile vibroflotation pile forming process and an underwater self-compacting cement-based cementing material self-flow grouting process; the vibroflotation cemented piles and soil bodies among the piles form a vibroflotation cemented pile composite foundation; and the pile body strength of the vibroflotation cemented piles in the composite foundation is sequentially increased from an outer ring to an inner ring and is sequentially decreased from the upper part to the lower part. The vibroflotation cemented piles effectively improve the bearing capacity of the soft soil layer, the applicability of the single-pile foundation in a shallow covering layer seabed and an offshore deep water wind power plant is expanded, meanwhile, a scouring structure does not need to be additionally arranged, and the single-pile foundation has the characteristics of being low in foundation manufacturing cost and construction cost, high in construction efficiency and easy and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of pile foundations of marine engineering, and relates to a single pile foundation and a construction method for strengthening soft soil foundations with offshore wind power vibrating cemented piles. Background technique [0002] Offshore wind power has the advantage of being clean and efficient, and is an important development direction in the field of new energy. At present, offshore wind power monopile foundations have the advantages of fast construction speed, low engineering cost, and strong foundation applicability, accounting for more than 80% of the installed foundations. As offshore wind farms gradually move from offshore shallow water areas to offshore deep water areas and deep seas, and the capacity of wind turbines continues to increase, single pile foundations need to provide greater horizontal bearing capacity. However, the surface layer of the seabed in some sea areas in my country is deep an...

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Problems solved by technology

However, the surface layer of the seabed in some sea areas in my country is deep and thick soft soil, and the bearing layer under the soft soil layer is relatively thin. If a conventional single pile foundation is used, the soil around the pile cannot provide horizontal resistance that meets the design requirements; Foundation forms such as frames and rock-socketed piles, on the one hand, greatly increase the foundation cost, and on the other hand, significantly prolong the construction period

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