Artificial drainage and dewatering, cushion and low-energy replacement dynamic compaction shallow foundation strengthening method

Abstract

The invention discloses an artificial drainage and dewatering, cushion and low-energy replacement dynamic compaction shallow foundation strengthening method. The method mainly comprises the construction steps that (1) surface cleaning and field leveling are carried out; (2) surveying and positioning are carried out; (3) artificial drainage and dewatering are carried out, wherein artificial vacuum well-point dewatering can be adopted; (4) a cushion, such as mountain skin stone or gravel, with the thickness ranging from 500 mm to 1000 mm is paved; (5) low-energy dynamic compaction replacement construction is carried out, wherein the manners of dynamic compaction replacement, two times of point compaction and one time of full compaction are adopted, a column hammer is firstly adopted for impact holing, layered filling and layered punching and enlarging compaction is adopted to form a replacement pillar body, and after a dynamic compaction replacement point is completed, the manners of two times of point compaction and one time of full compaction are adopted for conducting dynamic compaction until the process is completed; and (6) dynamic compaction monitoring and detecting are carried out. According to the artificial drainage and dewatering, cushion and low-energy replacement dynamic compaction shallow foundation strengthening method, the strengthening effect on shallow foundation soil is obvious, the constructing cost is low, and the practicability is high. The strengthening method is particularly suitable for shallow strengthening of large-area treatment zones with small groundwater depth and low shallow foundation soil bearing force and incapable of achieving safe walking of construction machines and engineering requiring the foundation bearing force not larger than 80 KPa.

Description

technical field [0001] The invention relates to a method for artificially draining precipitation, a cushion layer, and low-energy replacement dynamic compaction shallow foundation, which belongs to the technical field of fixed buildings. Background technique [0002] As an important link in the construction field, foundation treatment directly affects the effect, economic cost and construction period of the project. Due to the scarcity of land resources, land reclamation projects are increasing day by day, and coastal areas, breeding ponds, rice fields and other lands are requisitioned and used as construction sites. This type of site has the characteristics of weak soil quality, high compressibility, under-consolidation, shallow buried water table, and difficulty in mechanical walking during construction. For this kind of weak foundation soil, there are usually replacement and filling methods, vacuum surcharge preloading method, riprap method, cement-soil mixing pile, dyna...

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Problems solved by technology

[0003] The above-mentioned weak soil foundation, its foundation bearing capacity and settlement cannot meet the requirements of the use of the floor, the superstructure design, etc., nor can it meet the requirements of the construction machinery and equipment and the safe walking of the on-site operating vehicles. great influence

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