Treatment method for hydraulic structure foundation

Abstract

The invention discloses a treatment method for a hydraulic structure foundation. The treatment method comprises the following steps that 1, a foundation trench is excavated at the mounting position of a hydraulic structure on a seabed, and undisturbed sand with enough thickness is reserved at the bottom of the foundation trench; 2, sand is thrown into the foundation trench until the replacement and filling sand in the foundation trench reaches the designed elevation; 3, a crawler crane is placed on a flat barge; 4, a vibroflot is adopted for carrying out vibroflotation reinforcement on the foundation of a foundation bed, the vibroflotation width is the sum of the bottom width of the foundation trench and the two sides expanded outwards by 5 m, and the vibroflotation thickness is the bottom elevation from the design elevation of the replacement and filling sand in the foundation trench to the undisturbed sand; and 5, the surface layer of the foundation bed is tamped and reinforced by adopting a rammer. According to the treatment method, the combined treatment mode of a vibroflotation method and a dynamic compaction method is adopted, the surface layer quality of the treated foundation can be greatly improved, the overall treatment effect of the foundation can be improved, and the strength and impermeability and liquefaction resistance of the treated foundation are improved.

Description

technical field [0001] The invention relates to a treatment method for foundations of hydraulic structures. Background technique [0002] When constructing a hydraulic structure, the foundation of the hydraulic structure must first be treated to improve the strength, impermeability and liquefaction resistance of the foundation. Among the treatment methods of foundations of hydraulic structures, the vibro-shock method is a foundation reinforcement treatment method to improve bad foundations and meet the foundation requirements of buildings (structures). The vibration force generated by the vibrator in the horizontal or vertical direction, supplemented by pressure water to vibrate the surrounding soil, achieves a foundation treatment method that improves the bearing capacity of the foundation, increases the stability of the foundation, reduces the amount of settlement, and improves the ability to resist earthquake liquefaction. The vibrating method is divided into the vibrati...

AI Technical Summary

Problems solved by technology

However, when dealing with underwater foundations, especially the backfill sand and undisturbed sand are coarse sand or medium-fine sand foundations with a fine particle content (particle size <0.075mm) of less than 12% to 15%, which are affected by factors such as buoyancy and small treatment thickness. The quality of surface layer is often difficult to guarantee

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