Electro-osmotic drainage method in construction of large-area deep foundation pit in sludge region with high water ratio

Abstract

The invention relates to an electro-osmotic drainage method in the construction of a deep foundation pit, in particular to an electro-osmotic drainage method in the construction of a large-area deep foundation pit in a sludge region. The electro-osmotic drainage method in the construction of the large-area deep foundation pit in the sludge region with high water ratio comprises the following steps of: arranging electro-osmotic well points on the periphery of the foundation pit to stabilize a side slope of the foundation pit and control underground water outside the foundation pit to osmose into the foundation pit; also arranging a drainage board in the foundation pit according to the area of the foundation pit, and also arranging an electrode on the drainage board to enhance the drainage efficacy of the drainage board; arranging a grid shaped blind ditch according to the plane layout strike of the drainage board when the drainage board is arranged, wherein the top end of the drainage board is arranged in the blind ditch, and the blind ditch is connected with a drainage system of the foundation pit; binding round steel used as a negative electrode on the drainage board, and arranging a positive electrode 0.85-1.2 m away from the drainage board; and electrifying, and fast unwatering the underground water inside the foundation pit by utilizing electrophoretic characteristics. The invention is applicable to large-area foundation pit drainage and has low cost and good effect.

Description

technical field [0001] The invention relates to an electroosmotic drainage method in the construction of deep foundation pits, in particular to an electroosmotic drainage method in the construction of large-area deep foundation pits in silt areas. Background technique [0002] The large-scale iron and steel bases currently being built in my country are basically located in coastal or water-developed areas, such as Shanghai, Tianjin, Ningbo and other places, and the coastal areas are mostly dredged reclamation foundations, which are mostly silt or muddy silt, with a moisture content of 40~ 70%, the saturation is 100%, and the K value of the permeability coefficient is too small, generally 10 -6 ~10 -8 cm / s, it is very difficult to excavate foundation pits when building various buildings on this foundation, and the thickness of the muddy soil layer and the buried depth vary from 0 to -20m. How to quickly and effectively remove the Drainage of stagnant water, improving the eng...

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