Super-soft dredger fill surface layer solidification crusting and foundation treatment method

Abstract

The invention discloses a super-soft dredger fill surface layer solidification crusting and foundation treatment method. The method comprises the following steps: (1) filling a super-soft dredger fill foundation to a target scale height; (2) directly pouring a flow-plastic sea mud-water-curing agent mixture onto the super-soft dredger fill foundation through a pumping pipeline of a large-sized workboat, solidifying for crusting to form a crust layer; (3) backwardly inserting a vertical plastic drain plate into the crust layer by adopting a spile machine, grooving in the surface of the crust layer, paving a horizontal drain pipe, and connecting the horizontal drain pipe with the vertical plastic drain plate end to end; (4) paving non-woven fabrics and a sealing film in sequence on the horizontal drain pipe from top to bottom, connecting the horizontal drain pipe with a vacuum pumping system, and performing vacuum pumping prepressing. By adopting the super-soft dredger fill surface layer solidification crusting and foundation treatment method, the vertical plate drain plate can be inserted in a complete mechanical way under the condition of no gravel material, bamboo sheathing or ribbed sheathing, the construction period is shortened greatly, and the construction is not restrained by the supply of the gravel material or the strength of filling soft soil.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment in aspects of civil engineering, port or waterway engineering, water conservancy engineering, etc., and relates to a supersoft dredging fill soil surface solidified crust and a foundation treatment method. Background technique [0002] The rapid development of economic construction in coastal cities has an increasingly urgent demand for land. In order to solve the situation of "more people and less land", many cities have begun large-scale land reclamation activities. The working mode of "drying filling + vacuum (storage) preloading" is the most common construction method in land reclamation projects at present. In the pre-pressurized drainage consolidation of the dredged soft soil, it is necessary to consolidate the dredged foundation to a certain strength through natural evaporation and self-weight, and then fill a certain thickness of sand and gravel materials as a bearing layer or...

AI Technical Summary

Problems solved by technology

Sea reclamation projects are mostly concentrated in the Pearl River Delta, Yangtze River Delta, Tianjin, Hong Kong and other regions. In these regions, sand and gravel materials have begun to be in serious shortage. Transshipment from further regions means a significant increase in construction costs and a serious delay in project progress.

In addition, based on the existing technology, in most cases, construction machinery cannot enter the reclamation area. The paving of the load-bearing drainage cushion and the installation of the plastic drainage board required for the later foundation treatment are almost entirely dependent on manual labor. Struggling scenes in "The Swamp" can be seen at any time, the construction speed is slow, and there is almost no mechanization at all

[0003] Therefore, the traditional "drying filling + vacuum (surcharge) preloading" working mode mainly has the following defects and deficiencies: (1) The period of natural evaporation and self-weight consolidation of the dredging filling foundation is long, which seriously increases the construction period; (2) ) requires a large amount of sand and gravel materials to be used as the bearing layer and horizontal drainage cushion, and the construction cost is high and the waste is serious; (3) In the actual construction, the laid bamboo fence, tendon fence and other materials are left on the dredged fill foundation because they are not easy to take out and slowly degrade over time, so it may cause excessive additional settlement of the foundation for dredging and filling in the later stage; (4) The degree of mechanization is low, relying entirely on manual labor, and the construction efficiency is low and difficult

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