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A Solution Method of Flow Reduction Method in Calculation of Mutual Resistance of Complete Wells in Confined Water

A technology for complete wells and confined water, which is used in calculations, special data processing applications, instruments, etc., and can solve problems such as the inability to accurately calculate the water reduction coefficient and the interference water output, and the inability to determine the additional depth of the interference pumping.

Inactive Publication Date: 2018-01-09
JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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Problems solved by technology

[0033] In order to overcome the problems that the current flow reduction method cannot determine the additional drawdown that interferes with the pumping, and cannot accurately calculate the reduction coefficient of the water output and the interference water output, the present invention proposes a solution of the flow reduction method in the calculation of the mutual resistance of wells with intact confined water method, that is, the known drawdown S′ of the disturbed pumping i , to accurately solve the water output reduction coefficient α i , and then by α i Calculation of water output that interferes with pumping

Method used

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  • A Solution Method of Flow Reduction Method in Calculation of Mutual Resistance of Complete Wells in Confined Water
  • A Solution Method of Flow Reduction Method in Calculation of Mutual Resistance of Complete Wells in Confined Water
  • A Solution Method of Flow Reduction Method in Calculation of Mutual Resistance of Complete Wells in Confined Water

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Embodiment Construction

[0069] the case [2] : It is planned to build 4 complete wells with a diameter of 400mm in the medium-fine sand confined aquifer, arranged in a straight line, and the distance between two adjacent wells is 100m. It is known that the thickness of the confined aquifer is M=20m, the permeability coefficient is 7m / d, and the influence radius of the well is 350m. If the design water level drawdown of each well is 5m during common pumping, try to find the water yield of each well during common pumping.

[0070] (1) adopt the solution method of the flow reduction method proposed by the present invention

[0071] 1) The drawdown calculated by formula (14) when each well is pumped independently is equal to the drawdown S′ of the interference pumping j = 5m (j = 1, 2, 3, 4) when the water output:

[0072]

[0073] 2) According to the data given in the case, calculate t by formula (13) i-j , and the matrices A and B are:

[0074]

[0075] From formula (17), we can get α 1 = α ...

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Abstract

The invention provides a solving method for a flow cut-down method in confined water fully penetrating well well-group mutual resistance calculation, and belongs to the technical field of municipal engineering. Aimed at problems that a previous flow cut-down method cannot correctly calculate a water yield reducing coefficient of disturbed water drawing, and disturbed water yield cannot be correctly calculated, the method comprises establishing a relational expression of the added drawdown of disturbed water drawing and the added drawdown of single water drawing, and based on the relational expression, establishing a practical equation set of relations of water yield reducing coefficient of each well and water level drawdown in disturbed water drawing, so as to calculate the water yield reducing coefficient of each well in disturbed water drawing. The method improves calculation efficiency, further establishes a matrix analytic expression of water yield reducing coefficient in disturbed water drawing, and using the expression, the water yield reducing coefficient of each well in disturbed water drawing can be conveniently calculated, so as to calculate the disturbed water yield of each well. Combined with an embodiment, implementation steps are discussed, and correctness of the method is further verified.

Description

1. Technical field [0001] The invention belongs to the technical field of municipal engineering. The flow reduction method in the calculation of mutual resistance of intact wells in confined water is often used in well group planning in water source areas, and its solution method and results directly affect the layout of well groups in water source areas and the selection of pumping equipment. 2. Background technology [0002] The water source is often composed of many tube wells. When the well spacing is greater than or equal to twice the influence radius, the pumping of each well will not interfere. However, it occupies a large area, the wells are scattered, and the investment in power supply lines and inter-well connecting pipes is large, and it is inconvenient to manage. Therefore, the well spacing of the general well group system is less than twice the radius of influence [1] , so that when the wells pump water at the same time, there will be interference phenomenon, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 张子贤
Owner JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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