Method for lowering water by combining phreatic water in footing groove with artesian aquifer - well stratifications

A technology of confined aquifers and confined water, applied in infrastructure engineering, construction, etc., can solve the problems of large number of wells, small treatment depth, high engineering cost, etc., achieve significant economic benefits, reduce the number of wells, and excavate The effect of improving construction efficiency

Active Publication Date: 2007-12-26
SUNYOUNG CONSTR GROUP
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Problems solved by technology

This dewatering method has a large number of wells, a small treatment depth, and high engineering cost. It is only li...

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  • Method for lowering water by combining phreatic water in footing groove with artesian aquifer - well stratifications
  • Method for lowering water by combining phreatic water in footing groove with artesian aquifer - well stratifications

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Embodiment Construction

[0027] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0028] Embodiment Take the foundation pit dewatering project of a subway station in Shanghai as an example.

[0029] A subway station in Shanghai has two floors underground, and the main body is a three-story two-span (partial three-story three-span, second-story two-span) cast-in-place reinforced concrete structure. The main structure of the station is 313.5 meters long and 22.8 meters wide. The excavation of the foundation pit of the station is divided into two areas. The excavation depth is 22.39 meters in the south end of the well, 23.01 meters in the north end o...

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Abstract

This invention relates a method for combined precipitation with pit phreatic water and aquifer layers including the following steps: applying one well structure to a precipitation well, closing a controllable water valve when evacuating the phreatic water, analyzing 3-D underground water seep to determine limit elements, pumped volume and influence radius, when the dig reaches to a water-isolation layer, the water in the aquifer layer is pumped to reduce water pressure to determine the dig depth, water-pump volume, orifice of wells, numbers, the influence radius of water power fall and sedimentation of surrounding ground using a method for computing limit elements determined based on 3-D underground water seepage and ground sedimentation based on plane diameters of the pit, dig depth, embedded depth of underground wall and structure condition of the aquifer layer.

Description

technical field [0001] The invention relates to a construction method in the technical field of underground engineering construction, in particular to a method for joint dewatering of foundation pit diving and confined aquifer-well stratification. Background technique [0002] Underground construction in soft soil foundation with high groundwater level, such as foundation pit excavation, the biggest problem in construction is that the existence of groundwater will cause water gushing at the bottom of the foundation pit. Therefore, using well points or large-diameter tube wells to artificially lower the groundwater level is a common and effective method in excavation construction of foundation pits. The method of foundation pit excavation generally adopts dry excavation, that is, the water in the soil body that needs to be excavated is drained first (keep the groundwater level at 1m below the excavation surface), and then the method of excavating the soil. In addition, when ...

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Application Information

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IPC IPC(8): E02D19/10
Inventor 沈水龙许烨霜张金辉高世轩马忠政蔡宽余周俊峰许锋朱继文
Owner SUNYOUNG CONSTR GROUP
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