Vacuum preloading consolidation method for duplex vacuum tube well of blowing filling soft soil

Abstract

The invention discloses a vacuum preloading consolidation method for a duplex vacuum tube well of blowing filling soft soil. The duplex vacuum tube well comprises an inner tube, an outer tube and a filter membrane; the water in the outer tube is pumped away by using the inner tube communicated to the bottom of the outer tube, and negative pressure is generated in the outer tube, so that the negative pressure of a vacuum pump is directly applied to the consolidated soil body; at the initial stage of consolidation, the blowing filling soft soil has high water content and low strength, and for preventing soil grains from moving to a drainage body to form lumps under the action of negative pressure, the vacuum pump is intermittently opened to fulfill the main purpose of pumping the water freely seeped into the drainage body under the action of gravity; at the later stage of consolidation, the vacuum pump is constantly opened, and low vacuum and high vacuum are sequentially adopted, so that the effect of forming the lumps around the drainage body by the viscous soil grains is weakened, and energy conservation and high efficiency of the consolidation process are realized; and moreover, because the negative pressure does not need to be transmitted to the soil body by spreading a sand cushion, the method can be applied in the places lacking in sand sources. Compared with the traditional vacuum preloading, the method is more suitable for consolidating the blowing filling soft soil with high water content.

Description

technical field [0001] The invention relates to a large-area reinforcement technology for dredging and filling soft soil, and belongs to the technical field of civil engineering foundation treatment engineering. Background technique [0002] In 1952, Professor Kjellman (Kjellman) proposed the method of vacuum preloading to strengthen the soft foundation. The basic technical method is to lay a layer of drainage cushion on the surface of the soft soil foundation to be reinforced as a horizontal drainage cushion, and then put the bagged sand The well or plastic drainage board is driven into the soil as a vertical drainage body, and then the sealing film is laid on the drainage cushion, and the surrounding of the sealing film is buried in the soil, and the soil under the sealing film is sealed by the pipe buried in the drainage cushion. The air in the body is drawn out to form a relative negative pressure. Since the bagged sand well or plastic drainage board has high permeabilit...

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Problems solved by technology

[0006] In order to overcome the low transfer efficiency of the negative pressure of the vacuum pump to the soil in the large-area reinforcement technology of dredger filling soft soil, the soil is not easy to drain, the reinforcement effect is not obvious, it is not suitable for places where sand sources are lacking and the cost High deficiencies, the present invention provides a method of improving the transfer efficiency of the negative pressure of the vacuum pump to the soil, making it easier to discharge the water in the soil, improving the reinforcement effect, suitable for places where sand sources are scarce, and reducing costs. Vacuum Preloading Reinforcement Method for Duplex Vacuum Tube Wells

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