Construction method for fast concreting and dredging and filling ultra-fine earth foundation

Abstract

The invention relates to a construction method, in particular to a construction method for fast concreting and dredging and filling ultra-fine grained soil foundation. The method comprises the following steps of: arranging a well-point pipe on the surface of a consolidated foundation area and starting a vacuum pump for forced water discharging; arranging calcium oxide on the surface of the consolidated foundation area, mixing with an excavator, fully blending within a treatment deep range, leveling the surface with a bulldozer after the completion of the mixing, stewing materials for 24 hoursuntil the calcium oxide is fully decomposed, utilizing the physical and chemical reactions between the calcium oxide and a soil body to increase the weight of the soil body and generate self-weight concreting; starting an impact rolling and vibration rolling equipment to generate displacement, distortion and shearing to the soil grains, thus compacting the deep layer of the soil body together withthe transmission of a shock wave and quickening the sedimentation and consolidation of the soil body within the treatment range. The foundation carrying capacity can reach 80 to 120 kPa after being treated, thus solving the problem that personnel and equipment are operating at the site in a short time, and the technique is mature, and the construction efficiency is high.

Description

Construction method of rapid consolidation dredging and filling superfine grain soil foundation Technical field: The invention relates to a building construction method, in particular to a construction method for rapidly consolidating dredging and filling superfine-grained soil foundation. Background technique: The land reclamation project faces two main problems, one is the material of the dredger fill, and the other is the reinforcement of the foundation of the dredge fill. From a technical point of view, the most ideal dredger fill material is sand. However, due to the large amount of sand used in construction projects and the need to restrict or prohibit sand mining for environmental protection and water conservancy safety, sand is expensive and in short supply, making it difficult to meet the environmental requirements. The need for marine land-making engineering materials. At present, the dredged silt soil is mainly used as the fill soil for land reclamation. Howev...

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Problems solved by technology

However, the soil has a very high water content and is in a flowing state. It has high compressibility, low strength and low bearing capacity. Especially, the soil particles from the outlet of the dredging pipeline to the end of the dredging area change from coarse to fine, and the soil particles from the bottom to the surface Shows the characteristics of particle distribution from coarse to fine, particle size ≤ 0.005mm, organic matter content greater than 7.5% of the total mass, and the bearing capacity of the foundation cannot meet the conditions for personnel and equipment to enter the site

Conventionally, the method of natural consolidation is adopted, that is, it takes about 2-3 years to remove the water in the dredged ultra-fine-grained soil, and the cost is very high if methods such as replacement are used

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