Immediate processing method for hydraulic fill of ultra-soft foundation by modified vacuum preloading and water-covering preloading

Abstract

The invention relates to an immediate processing method for hydraulic filling an ultra-soft foundation by modified vacuum preloading and water-covering preloading. The technical proposal of the invention comprises the following steps of: building a float bridge on a mud area in a causeway, laying a plastic woven cloth on the mud area, fixing the plastic woven cloth on the causeway and the float bridge, horizontally laying a water discharge branch pipe on the plastic woven cloth, inserting a plastic water discharge board around the water discharge branch pipe in the mud of the mud area, horizontally laying a water discharge main pipe on the plastic woven cloth in the direction perpendicular to the water discharge branch pipe, connecting one end of the water discharge main pipe to a vacuum pump, laying a geotextile on the water discharge main pipe and the water discharge branch pipe, laying a vacuum film on the geotextile, and arranging a water load on the vacuum film. The invention solves the technical problems of unenforceable construction existing in the traditional vacuum preloading foundation treatment method, and has the advantages of simple process, convenient construction and lowered cost. Besides, after the hydraulic filling of the foundation is completed, the foundation can be immediately processed, thereby greatly shortening the foundation processing period, and ensuring that the invention is a very economical and practical soft foundation processing method.

Description

technical field [0001] The invention relates to a foundation treatment method, in particular to a rapid treatment method for blow-filled ultra-soft foundation modified vacuum preloading combined with water-covered preloading. Background technique [0002] In recent years, the lack of construction land has become a bottleneck restricting the economic and social development, especially in coastal areas. Therefore, large-scale land reclamation projects are being carried out in coastal areas. However, the geological conditions of land reclamation are complex. The new dredged fill mud is mainly characterized by high mud content, poor permeability, zero strength, and is in an ultra-soft state. Personnel and construction machinery cannot directly enter the site. [0003] Before the present invention, often adopt vacuum preloading to carry out reinforcement treatment for muddy soft foundation, make it have certain intensity. The method is to mechanically insert plastic drainage boa...

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Problems solved by technology

[0004] (1) For the dredger fill mud in the super soft state, since construction machinery cannot enter the site, it is impossible to lay plastic drainage boards, and it is also impossible to lay horizontal drainage sand cushions. This limitation limits the application of traditional vacuum preloading

[0005] (2) There is a lack of sand sources in some places, and the price of sand continues to rise. Although plastic drainage blind pipes and three-dimensional composite drainage networks have come out, the cost is too high, and the cost of large-scale construction projects is difficult to bear. Difficulties in carrying out construction

[0006] (3) The construction and treatment period of the traditional treatment method is long, which will greatly affect the progress of the project

[0007] (4) In traditional vacuum preloading, PVC round pipes and round pipes with holes are used as drainage main pipes and drainage branch pipes. PVC thick-walled round pipes have a large cavity, high rigidity and are not easy to deform, but the length of each round pipe is only 6m. Therefore, there are many joints. Excessive joints during construction on ultra-soft ground will lead to slow connection of pipe heads, poor connection quality, and disengagement of joints during uneven settlement.

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