Dewatering method implemented through permeation, weakening and emission reduction

Abstract

The invention discloses a dewatering method implemented through permeation, weakening and emission reduction. The method comprises the following steps of 1, excavating a foundation pit, wherein the depth of the foundation pit is H, and constructing a sidewall water-stop curtain around the foundation pit, wherein the distance between the bottom of the sidewall water-stop curtain and a cohesive soil layer is greater than 5 m; 2, driving steel tubes uniformly into a sandy soil layer which is located at a certain depth H1 away from the bottom the foundation pit, and injecting grout into the steel tubes, so that a bottom-sealing water-stop curtain is formed; and 3, arranging a dewatering well on the upper layer of the bottom-sealing water-stop curtain, wherein water in the pit and water seeping into the pit through the bottom-sealing water-stop curtain are lowered. According to the dewatering method, the bottom-sealing water-stop curtain of a certain thickness is constructed at a certain depth under a foundation, so that water-enriched and high-permeability soil is changed into a low-permeability or weak-permeability soil layer, and then only water in the pit or a small amount of water permeating the bottom-sealing water-stop curtain is lowered, so that water in the high-confined-water foundation pit is lowered.

Description

technical field [0001] The invention relates to the field of foundation pit construction, in particular to a seepage weakening method for reducing discharge and dewatering. Background technique [0002] In the construction of foundation pit engineering in areas with high confined water, in order to ensure that the construction is above the low water level and that accidents such as serious water seepage and inrush of the foundation of the pit wall machine do not occur during construction, it is generally necessary to carry out foundation pit dewatering, but for places like Wuhan Located on the banks of the Yangtze River, where the water level of the river is higher than the surface, and other areas with abundant groundwater replenishment, often due to abundant water source replenishment, precipitation has a large range of influence, and conventional precipitation methods generally cannot effectively reduce the low water level. The curtain is inserted into the clay layer with...

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Problems solved by technology

[0002] In the construction of foundation pit engineering in areas with high confined water, in order to ensure that the construction is above the low water level and that accidents such as serious water seepage and inrush of the foundation of the pit wall machine do not occur during construction, it is generally necessary to carry out foundation pit dewatering, but for places like Wuhan Located on the banks of the Yangtze River, where the water level of the river is higher than the surface, and other areas with abundant groundwater replenishment, often due to abundant water source replenishment, precipitation has a large range of influence, and conventional precipitation methods generally cannot effectively reduce the low water level. The curtain is inserted into the clay layer with a certain thickness under the foundation pit and then dewatered. When the clay layer under the foundation pit is far away from the bottom of the pit and the construction depth of the side wall water-stop curtain is limited, the side wall water-stop of the foundation pit (that is, the water-stop The water curtain is not inserted into the clay layer at the bottom of the foundation pit) combined with the curtain at the bottom of the pit and then lowered into the pit, but for areas with high water pressure, it is often difficult to seal the bottom of the curtain, and sudden surges at the bottom of the pit often occur, resulting in a sudden large amount of water in the pit. Major accidents in foundation pit engineering such as water gushing

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