Groundwater control method of composite water bearing structure of deep foundation pit

Abstract

The invention relates to a groundwater control method of a composite water bearing structure of a deep foundation pit, which belongs to the technical field of civil construction and solves the technical problems of large construction difficulty and high construction cost. The method relates to the operation of the deep foundation pit in an area of the composite water bearing structure, and the composite water bearing structure comprises an upper water bearing layer and a lower water bearing layer. The method comprises the steps of constructing a vertical waterproof curtain when the deep foundation pit is operated, and partitioning the upper water bearing layer by utilizing the waterproof curtain; then constructing a water diversion filtering layer in a water partitioning layer which is arranged on the inner side of the waterproof curtain and is located between the two water bearing layers, so that the two water bearing layers communicate; then constructing a precipitation well and a precipitation observation well on the inner side of the waterproof curtain, and performing precipitation on the upper water bearing layer by utilizing the precipitation well and the precipitation observation well; and constructing a recharge well and a recharge observation well on the outer side of the waterproof curtain, and timely recharging the lower water bearing layer by utilizing the recharge well and the recharge observation well. The method provided by the invention is especially suitable for precipitation of the deep foundation pit in the area with a plurality of water bearing layers.

Description

technical field [0001] The invention relates to civil construction technology, in particular to a method for controlling groundwater of a deep foundation pit composite water-containing structure. Background technique [0002] With the development of urban construction, the development of the sub-deep space of 30 to 50 meters underground and the deep space of 50 to 100 meters underground is increasing, and a large number of ultra-deep foundation pit engineering projects are also emerging. [0003] In an ultra-deep foundation pit, precipitation in multiple confined aquifers is generally involved, and the precipitation is difficult. In order to eliminate or reduce the impact of foundation pit precipitation on the surrounding environment, a vertical water-stop curtain is usually used. However, with the deepening of the depth of the foundation pit, the depth of the vertical water-stop curtain will also become deeper and deeper, and its construction and technical difficulties will...

AI Technical Summary

Problems solved by technology

However, as the depth of the foundation pit deepens, the depth of the vertical water-stop curtain will also become deeper and deeper, and its construction and technical difficulties will also be greatly increased, and leakage will easily occur, and the cost will also further increase

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