A construction method for vacuum preloading foundation treatment

Abstract

The invention discloses a vacuum preloading foundation treatment construction method. The method includes the first step of conducting survey staking out, the second step of laying geotechnical cloth, the third step of laying vitex fences, the fourth steps of laying a soil cushion layer, the fifth step of laying a sand cushion layer, the sixth step of arranging a plastic drain plate in a striking mode, the seventh step of excavating a pressed film ditch, the eighth step of cleaning and embedding a plate head, the ninth step of embedding filter tubes and a film outlet device, the tenth step of cleaning and leveling the surface of the sand cushion layer, the eleventh step of laying a plastic film, the twelfth step of constructing a dam, the thirteenth step of vacuum air exhaust, the fourteenth step of vacuum unloading, and the fifteenth step of conducting cleaning and disassembly. According to the method, the strength and the rigidity of a foundation are improved, the reinforcing speed is high, the densification effect is good, the strength increase rate is high, the density of the foundation is improved, the foundation is made to be more stable, and the settling volume of the foundation is reduced. Vacuum is generated through air exhaust, the pore water pressure is effectively reduced, negative excess pore water pressure is generated to increase the effective stress of a soil body, reinforcing is conducted through the pore water pressure so that sphere effective stress increment can be generated, and the construction speed is effectively increased.

Description

technical field [0001] The invention relates to a construction method for vacuum preloading foundation treatment. Background technique [0002] There are a large number of soft soil foundations distributed in coastal areas and inland valleys in my country, which are characterized by high water content, high compressibility, poor water permeability and low strength. In order to ensure the safety of the project and the normal use of the building, foundation treatment must be carried out. Since the traditional vacuum preloading method was successfully applied in the late 1980s, a large number of engineering practices have proved that it is an effective method for strengthening soft soils, such as silt and silty soils. It is still the main foundation treatment technology for soft soil foundations. The traditional vacuum preloading method is a one-time vacuum preloading foundation treatment technology. For solving the newly formed dredged fill soil, its reinforcement effect cann...

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Problems solved by technology

The traditional vacuum preloading method is a one-time vacuum preloading foundation treatment technology. For solving the newly formed dredged fill soil, its reinforcement effect cannot reach the required level, and in order to achieve For the purpose of mechanical construction work, it is often necessary to lay a large amount of cushion materials such as Jingba and Bamboo Bamboo, which not only wastes resources, but also easily increases the content of soil organic matter and causes soil pollution.

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