Freeze thawing consolidation method for silt soft foundation

Abstract

The invention discloses a freeze thawing consolidation method for a silt soft foundation, which comprises the following steps of: 1, airing and settling dredger fill; 2, laying wattles on the surface of the dredger fill; 3, laying a working cushion on the wattles; 4, laying a sand cushion on the working cushion; 5, arranging a plastic drainage board; 6, arranging condensation pipelines and a temperature sensor; 7, loading; 8, refrigerating: blowing cold wind or a refrigerator into the condensation pipeline to freeze the silt, and stopping refrigeration when the temperature between two condensation pipelines is lower than -5DEG C; and 9, thawing by utilizing ground temperature and heat given out from ground surface, and draining and consolidating under the self weight and the loading pressure. Free water and film water with weak bond in the silt are frozen into ice; after the silt is frozen, the activity of the silt particles is reduced, the capacity of adsorbing the film water is reduced, and the free water and partial film water are iced and expanded, so the soil skeleton is severely damaged, a smooth drainage channel is formed, the viscosity of the silt is reduced, the water content of the silt is greatly reduced and the aim of quickly draining and consolidating is fulfilled. The freeze thawing consolidation method has the advantages of thorough drainage, high construction speed, energy conservation and environmental protection.

Description

technical field [0001] The invention relates to a method for treating a soft mud base, in particular to a method for freezing and thawing a soft mud base. Background technique [0002] Most of my country's coasts are muddy coasts, and the treatment of silt has always been the focus of design and construction of coastal buildings (structures), and it is also one of the main factors affecting project quality and cost. Silt has a high water content and dredger fill has an even higher water content. Due to the high water content of the sludge, the mechanical index of the sludge is very low, and it must be treated before it can be used in engineering. The original silt reinforcement technologies and processes include: [0003] Vacuum preloading: Vacuum preloading technology is often used for sludge reinforcement in coastal areas. The advantages are: the in-situ reinforcement of sludge can reinforce dredging and undisturbed sludge, and realize the waste utilization of sludge. T...

AI Technical Summary

Problems solved by technology

The disadvantages are: the permeability coefficient of the silt is too low, and the vacuuming time is too long (in Lianyungang port, when the silt thickness is 18 meters, the vacuuming time takes 9 months), which seriously affects the progress of the project; The water content is still high, reaching 50-60%, and the strength is still low

The disadvantages are: the cost is too high, it is only used in important parts of the project; the quality of the project is not easy to guarantee