Method for plugging relief well of deep foundation pit

Abstract

The invention discloses a method for plugging a relief well of a deep foundation pit. The method comprises the following steps of (1) necessary preparation before relief well plugging; (2) plugging construction on the relief well, wherein after base plate construction is completed, a body structure meets anti-floating requirements, and a fixed water level in a relief well in the foundation pit is located 2-3m below a foundation pit face, the plugging construction on the relief well can be carried out, the relief well in a working state is firstly plugged in an interval mode due to a large water yield, after the relief well is partially plugged, the working state of the relief well which is not plugged continues to be observed and comprises the water yield condition, the variation value of the water level, the fixed water level elevation and the water pump position elevation, the rest of the relief well continues to be plugged in an interval mode, and time is earned for well plugging by increasing pump output. The method has the advantages that the relief well can be successfully plugged when underwater pressure or water inflow is large, plugging quality is good, construction cost is lowered, and the method is worthy of popularization and application.

Description

technical field [0001] The invention relates to a plugging method for a relief well of a foundation pit, and belongs to the technical field of geotechnical engineering construction. Background technique [0002] With the unprecedented development of geotechnical engineering in my country, the number of foundation pit projects in my country is increasing, and the scale is also increasing. The depth of foundation pits is also deepening, and the complex underground geological conditions make the precipitation of foundation pits scientific and rapid. Rise. At present, there are many large-scale and deep foundation pits in our country. After the earthwork of such foundation pits is excavated, the overburden layer above the confined water level will drop sharply, and the phenomenon of foundation pit surges will easily occur. Decompression wells are used to pump water. It is an effective method to ensure the anti-surge stability of the foundation pit floor. However, the plugging o...

AI Technical Summary

Problems solved by technology

However, it is even more difficult to seal off the relief well of this type of foundation pit. This type of foundation pit has a large water pressure and a large amount of water. Once the pumping is stopped, the water level will rise sharply. Whether the well closure is successful or not, time is particularly important.

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