A kind of bagged sand cushion deep treatment soft soil foundation reinforcement method in freezing environment

Abstract

The invention discloses a method of stabilizing a soft foundation through deep processing of a bagged sand bed in a freezing environment. The method comprises the following steps of freezing the soft foundation under natural freezing conditions so as to form a hard frozen hard shell layer on the surface of the soft foundation; laying filling sand on the whole soft foundation region; carrying out hydraulic reclamation on silt fine sand or medium-coarse sand in reclamation as a sand bed; arranging a vertical drainage system; arranging a horizontal drainage system; laying a sealing film; after conforming to the vacuum condition, carrying out deep vacuum preloading or preloading or vacuum united preloading. According to the method, the freezing environment is utilized scientifically, a construction process is optimized reasonably, the deep drainage consolidation treatment is only carried out on the soft foundation once, the construction cost is reduced by about 1 / 4, and meanwhile, the winter time, which is not suitable for construction routinely, is utilized, the method is scientific and environment-friendly, and the good economic benefit and social benefit can be produced.

Description

technical field [0001] The invention relates to a method for consolidating drainage of soft foundations in the construction of highways, municipal projects and the like. technical background [0002] With the continuous development of the national economy, the scale of engineering construction continues to expand, and land resources are becoming more and more tense. Treating soft soils such as lakes, valleys, dredger fill, tidal flats, or marine silt with low bearing capacity into foundations with a certain bearing capacity will greatly improve the increasingly tense situation of land resources. [0003] In view of the characteristics of soft soil with high water content, high compressibility, low shear strength, poor water permeability and low strength, the main reinforcement methods currently used are natural drying and preloading. It takes 1 to 2 years for pretreatment to dry the super-soft soil on the surface naturally, so the construction efficiency is low and the cons...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) The construction time of the whole process is relatively long; (2) The cost of shallow surface treatment is a temporary construction measure, and the cost is high; (3) Limited by its own technical conditions, the reinforcement effect of shallow surface treatment is limited; (4) At present, this technology mainly relies on a large amount of manual implementation, and the project quality is difficult to control. At the same time, the shallow surface treatment needs to be carried out on the mud surface, and the construction environment is poor and dangerous

[0005] In the conventional soft foundation treatment method, the vacuum preloading construction period is long. In order to facilitate the deep soft foundation treatment, it is usually necessary to carry out the shallow surface soft foundation reinforcement treatment, which consumes a lot of economic costs.

[0006] In the northern part of my country, due to the low temperature and cold climate in winter, soft foundation treatment often avoids winter construction, resulting in a great waste of time and cost

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