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Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain

A technology of water-stop curtain and determination method, applied in excavation, infrastructure engineering, construction, etc., can solve problems such as small results, failure to directly determine the foundation pit, and inability to determine the influence of seepage water level.

Inactive Publication Date: 2016-03-02
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

The method of Wang Junhui et al. is only limited to passive sink items within the research area, and the structure completely cuts off the aquifer in the horizontal or vertical direction.
In addition, this method can only determine the water level change caused by the decrease of the seepage area when the groundwater passes through the lower part of the structure, but cannot determine the influence of the change of the seepage direction on the water level, and does not consider the anisotropy of the aquifer, so the result is too small
As for pumping water at a fixed flow rate in foundation pits under the action of water-stop curtains, there is currently no method to directly determine the confined water level inside and outside the foundation pit, so it is necessary to do further research on this aspect

Method used

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  • Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain
  • Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain
  • Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain

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Embodiment 1

[0091] Obtain the Δh of No. 1 dewatering well and No. 2 dewatering well of this embodiment 11 (r 1 ) and Δh 12 (r 2 ):

[0092]

[0093]

[0094] Step 6. Determine the water level change Δh at any point in the confined aquifer caused by the water stop curtain changing the seepage path during the single well pumping process 2i (r i )

[0095] The Δh 2i (r i ) satisfy the following formula: Δh 2i (r i ) = mΔh 1i (r i ),

[0096] m satisfies the following formula:

[0097] m = 1.32 b ( 1 - ε ) ( k x k ...

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Abstract

The invention provides a pressure bearing water level determining method for constant-flow water pump of a lower foundation pit of a suspension type waterproof curtain. According to the method, the ground water level when the waterproof curtain doesn't enter an aquifer and the ground water level change caused by the waterproof curtain are determined in a constant-flow water pumping process based on obtained soil layer information and water pumping information of the pressure bearing aquifer and according to the Darcy law and the water volume conservation principle. Thus, pressure bearing water levels in and out the lower foundation pit of the suspension type waterproof curtain in constant-flow water pump can be determined. By means of combination of the Darcy law, the water volume conservation principle and the ground water percolation theory, the distribution of pressure bearing water levels in and out the foundation pit can be visually reflected in foundation pit dewatering. Therefore, basis for analyzing effects of foundation pit dewatering on the surroundings is provided. The method is simple, practical, convenient to popularize and large in application value.

Description

technical field [0001] The invention relates to a construction technology in the fields of construction, water conservancy, transportation, environment and other underground engineering, in particular to a method for determining the pressurized water level of a foundation pit under a suspended water-stop curtain for pumping water at a constant flow rate. Background technique [0002] Foundation pit engineering is an important part of high-rise building construction and underground space engineering. Foundation pit dewatering is a key step in foundation pit excavation construction. The effect of foundation pit dewatering has great influence on the safety of foundation pit excavation and the settlement of the ground around the foundation pit have a major impact. With the expansion of city scale, the increase of land cost and the progress of construction technology, the foundation pit engineering in my country has gradually shown a trend of deep and large, and the depth of some...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D19/18E02D19/10
CPCE02D17/02E02D19/10E02D19/18
Inventor 沈水龙武永霞张宁吴怀娜
Owner SHANGHAI JIAO TONG UNIV
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