Method for determining pumping volume of suspended curtain confined water foundation pit based on three-dimensional drawdown

A technology of pressurized water and water pumping, which can be used in basic structure tests, basic structure engineering, construction, etc., and can solve problems such as poor prediction results

Active Publication Date: 2020-06-30
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for determining the pumping volume of a suspended curtain pressurized water foundation pit based on three-dimensional drawdown, so as to solve the technical problem of poor prediction effect

Method used

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  • Method for determining pumping volume of suspended curtain confined water foundation pit based on three-dimensional drawdown
  • Method for determining pumping volume of suspended curtain confined water foundation pit based on three-dimensional drawdown
  • Method for determining pumping volume of suspended curtain confined water foundation pit based on three-dimensional drawdown

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Embodiment

[0088] A method for determining the pumping volume of a suspended curtain confined water foundation pit based on three-dimensional drawdown, comprising the following steps:

[0089] The first step is to determine the initial calculation parameters of the seepage field.

[0090] In the second step, the precipitation seepage area of ​​the confined aquifer 3 is divided into the horizontal seepage area 32 outside the pit, the three-dimensional seepage area 34 outside the pit, the horizontal seepage area 36 at the bottom of the curtain, and the mixed seepage area 38 inside the pit.

[0091] The third step is to solve the width R of the three-dimensional seepage area outside the pit caused by the curtain barrier l and the horizontal seepage boundary radius R b .

[0092] The fourth step is to determine the position of the settlement sensitive point 6 outside the pit, and obtain the plane distance R between the settlement sensitive point and the center of the foundation pit i And ...

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Abstract

The invention provides a suspension type curtain pressure-bearing water foundation pit pump output determination method based on three-dimensional drawdown. Water level drawdown control value outsidea pit is firstly calculated, and the total water inflow control value is derived; after safe drawdown of the top of in-pit bearing water is determined, and the dewatering scheme is distributed, the foundation pit total water inflow mount and single well pump output of the dewatering scheme are determined through the safe drawdown control value of the in-pit bearing water, and then whether the foundation pit water inflow amount is in the control value or not can be further checked. According to the suspension type curtain pressure-bearing water foundation pit pump output determination method, based on the Darcy law and the flow equilibrium theorem, the three-dimensional seepage field formed by foundation pit dewatering below a suspension type water-stopping curtain and safe water level drawdown inside the pit and outside the pit are fully considered, the pump outputs of the foundation pit and a dewatering well under specific dewatering schemes can be precisely calculated, and it also can be guaranteed that the water level drawdown of the bearing water inside the pit and outside the pit according to the pump outputs are both in a safe control range. According to the constituted dewatering schemes based on the suspension type curtain pressure-bearing water foundation pit pump output determination method, the construction cost is lowered, and safety of dewatering construction is also ensured.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a method for determining the pumping volume of a suspended curtain pressurized water foundation pit based on three-dimensional drawdown. Background technique [0002] For deep foundation pits in high-water level confined aquifer strata, it is necessary to arrange dewatering wells before excavation to reduce the confined water level within the foundation pit range, so as to prevent the soil in the upper part of the foundation pit range from being damaged during the foundation pit excavation process. The pressure decreases, and the pressure of the lower part of the confined water makes the bottom of the foundation pit burst and rupture. In relevant foundation pit dewatering codes and groundwater dynamics books, the water level change and pumping flow caused by precipitation are mostly solved under the condition of no water stop curtain. For the situation where the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/10E02D19/18E02D33/00
CPCE02D19/10E02D19/18E02D33/00
Inventor 刘凌晖雷明锋郑邦友施成华曹成勇吴治刚
Owner CENT SOUTH UNIV
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