Processing method for strengthening vacuum preloading soft foundation by direct-current electric field

Abstract

The invention discloses a processing method for strengthening a vacuum preloading soft foundation by a direct-current electric field. A direct-current electric field operating well is arranged in a vacuum preloading soft foundation processing area, a direct-current power supply is installed, a positive-electrode discharge electrode or a negative-electrode discharge electrode is vertically arranged in the direct-current electric field operating well, the direct-current power supply is connected with the positive-electrode discharge electrode or the negative-electrode discharge electrode through a cable, the direct-current power supply is switched on in the vacuum preloading construction period, and therefore the direct-current power supply outputs direct currents which are transmitted to the positive-electrode discharge electrode through the cable, the positive-electrode discharge electrode discharges the direct currents to a soft soil layer in the soft foundation processing area, the direct-current electric field is formed in the soft soil layer between the positive-electrode discharge electrode and the negative-electrode discharge electrode, and direct-current electric field processing is performed on the soft soil layer of the vacuum preloading soft foundation processing area. According to the processing method for strengthening the vacuum preloading soft foundation by the direct-current electric field, the construction effect of processing the vacuum preloading soft foundation of mucky soil can be obviously enhanced, the purposes of reducing construction energy consumption and construction cost and shortening a construction period are achieved, and processing of the mucky soil soft foundation of a deep and thick layer can be effectively performed.

Description

technical field [0001] The invention relates to a soft ground treatment method, in particular to a direct current electric field enhanced vacuum preloading soft ground treatment method. Background technique [0002] Vacuum preloading method, as an important construction method for soft foundation treatment engineering, plays a very important role in coastal tidal flat development, land reclamation and other engineering projects. With the continuous development of the market and limited by the scarcity of sandy soil resources, the muddy soil formed by natural deposition or artificial dredging has increasingly become the construction object of vacuum preloading soft ground treatment projects. However, the existing vacuum preloading method has common difficulties in the soft foundation treatment of muddy soil, the main reasons are: [0003] 1) The silty soil has fine solid particles, high viscosity, and extremely low permeability, and the effect of vacuum transfer and drainage...

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Problems solved by technology

[0003] 1) Silty soil has fine solid particles, high viscosity, and extremely low permeability, and the effect of vacuum transmission and drainage consolidation in silty soil is poor

[0004] 2) Silty soil often contains a large amount of flocculent or colloidal organic matter. Fine solid particles and flocculent or colloidal organic matter in silty soil are easy to block capillary drainage in the soil during vacuum preloading drainage consolidation The channel and the filter cloth of the plastic drainage plate lead to the "dry pumping" phenomenon in which it is difficult to achieve the treatment effect even if the vacuum degree is increased or the vacuuming time is prolonged during the vacuum preloading process

Due to the limitations of the vacuum preloading technology itself, the optimum treatment depth of the soft ground treatment using the vacuum preloading technology alone is within 10m, and the effective treatment depth is only about 20m. Obviously, the vacuum preloading technology alone is not suitable for muddy soil Construction technical requirements for soft foundation treatment mainly in deep soft soil layer

[0008] In order to strengthen the effect of vacuum preloading soft ground treatment on muddy soil and meet the requirements of engineering design, the existing vacuum preloading soft ground treatment technology usually increases the density of plastic drainage boards and prolongs the construction of vacuum preloading soft ground treatment. However, it still cannot solve the clogging phenomenon of muddy soil layer and plastic drainage board filter cloth, and the construction effect of vacuum preloading soft foundation treatment for muddy soil is still not good

[0009] In recent years, with the demand of the market, innovative technologies have been emerging in the soft ground treatment industry, such as the research of electroosmotic method combined with vacuum preloading method or the direct discharge vacuum preloading method of using plastic drainage boards to directly connect vacuum pipes and other construction technologies. These new technologies have improved the treatment effect of vacuum preloading soft ground, but still have not fundamentally solved the low permeability and self-clogging problems of muddy soil in the vacuum preloading process, and the effect is still the same when dealing with muddy soil soft ground. not ideal

Especially in the soft ground treatment of deep and thick muddy soil, there is no breakthrough technological innovation in the soft ground treatment industry

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