System and method for reinforcing sand-contained soil interlayer soft foundation in vacuum-electro-osmosis combination mode

Abstract

The invention discloses a system for reinforcing a sand-contained soil interlayer soft foundation in a vacuum-electro-osmosis combination mode. The system is composed of subsection EKG drainage electrodes, flexible conductive joints, conductive circuits, a direct-current power supply, a power supply control system, plastic drainage boards, horizontal drainage pipelines, a vacuum pump and the like. The subsection EKG drainage electrodes are connected with one another through the flexible conductive joints, the rough drainage electrodes are used in a soft soil layer, the fine drainage electrodes are used in a sand soil layer, each fine drainage electrode is sleeved with a corrosion-resistant insulating rubber tube, and part, located on a sand soil interlayer, of the drainage boards are wound with a ring of water-proof material through strong water-proof adhesives. The invention further discloses a use method of the system, static sounding is conducted on the positions of the drainage electrodes and the positions of the drainage boards, processing and assembling are conducted on the drainage boards and the drainage electrodes according to results, and finally the soft foundation is reinforced in the vacuum pre-compaction and electro-osmosis drainage combination mode. The system can reinforce the sand-contained soil interlayer soft foundation by combining a vacuum pre-compaction ground treatment method and an electro-osmosis drainage ground treatment method.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation treatment, in particular to a system and method for vacuum electroosmosis combined reinforcement of soft soil foundation with sandy soil interlayer. Background technique [0002] Vacuum preloading technology has been widely used in my country since the 1980s. It is a mature and effective soft soil foundation treatment method, but this method has the following shortcomings and deficiencies: (1) For soft soil foundations with sandy soil interlayers, Due to the good drainage performance of the sandy soil layer, the general effect of vacuum preloading treatment is not good; (2) vacuum preloading can only discharge the free water in the soil, but can do nothing to the bound water in the soil; (3) vacuumize the soil It takes a long time for the body to reach a certain consolidation index, and the processing cycle is long. [0003] The electroosmotic drainage method is an efficient soft soil ...

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Problems solved by technology

[0002] Vacuum preloading technology has been widely used in my country since the 1980s. It is a mature and effective soft soil foundation treatment method, but this method has the following shortcomings and deficiencies: (1) For soft soil foundations with sandy soil interlayers, Due to the good drainage performance of the sand layer, the effect of vacuum preloading treatment is generally not good; (2) vacuum preloading can only discharge the free water in the soil, but can do nothing to the bound water in the soil; (3) vacuumize the soil It takes a long time for the body to reach a certain consolidation index, and the processing cycle is long

This type of electrode is easy to install and low in cost, but has many disadvantages: (1) When the soft soil layer to be treated contains a sandy soil interlayer, the electroosmotic circuit is prone to short circuit under the connection of pore water, resulting in loss of personnel and equipment; (2) The anode and cathode use electrodes with different structures, and the electrode conversion technology cannot be used, and the treatment effect will be uneven on the plane; (3) Under the action of the current, the electrodes are easy to chemically react with the mineral components in the soil, Cause electrode corrosion damage; (4) electroosmotic drainage is greatly affected by rainwater recharge

[0004] The combined use of vacuum preloading and electroosmotic drainage is a new soft foundation reinforcement technology developed in recent years. Because the commonly used metal electrodes will push out of the soil and pierce the vacuum membrane in the later stage of treatment, causing air leakage, affecting the effect of vacuum preloading, and Vacuum preloading and electroosmosis cannot be used directly for soft soil foundations with sandy interlayers, making it difficult to use combined electroosmotic drainage and vacuum preloading to treat soft soil foundations with sandy soil interlayers

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