In-hole air bag expansion pressurization and vacuum-electroosmosis composite drainage precipitation system and method

Abstract

The invention relates to an in-hole air bag expansion pressurization and vacuum-electroosmosis composite drainage precipitation system and method. The system comprises a vacuumizing mechanism, a direct-current power supply mechanism, an air compression mechanism, a plurality of vacuum drainage wells and a plurality of transverse pressurizing holes distributed around each vacuum drainage well. Theprecipitation method comprises the following steps: (1) vacuum tube well drainage, wherein most of free water is drained under the action of vacuum suction force, and electroosmosis precipitation timeis saved; (2) vacuum electroosmosis precipitation, wherein part of pore water is drained under the action of vacuum suction force and electroosmosis force, and the water content of the soil body is further reduced; and (3) vacuum transverse pressurization precipitation, wherein a pressurization air bag is expanded squeeze the surrounding soil body, so that the pore ratio is rapidly reduced, the drainage precipitation speed is increased, and the soil body is reinforced. Compared with the prior art, by means of the effects of vacuum water absorption, air bag pressurization and electroosmosis, the risks of foundation pit excavation water gushing and pile foundation damage by soil movement in high-water-content and low-permeability soil layers are reduced, and rapid drainage precipitation ofmuddy soil is realized.

Description

technical field [0001] The invention belongs to the technical fields of geological engineering, geotechnical engineering and foundation pit engineering, and in particular relates to a system and method for inflating and pressurizing an airbag in a hole and vacuum-electroosmotic composite dewatering and dewatering. Background technique [0002] In the construction environment with high groundwater level, well point precipitation is often used to drain the water in the foundation soil, promote the consolidation of the soil, improve the strength of the foundation, and provide relatively dry construction conditions. However, the muddy powdery clay and the powdery clay layer have high water content and poor permeability. It is difficult to dewater and dewater by conventional methods, which may lead to high water content and large deformation of the soil. There may be a risk of water gushing during excavation of the foundation pit, resulting in soil movement. To damage the pile fo...

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Problems solved by technology

[0004] However, in high water content and low permeability soil layers, vacuum tube well dewatering efficiency is not high and is prone to cut-off. Although vacuum electroosmotic dewatering has high water output efficiency, it also costs a lot.

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