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A Calculation Method of Effective Water Holdup Used in Groundwater Restoration by Extraction

A calculation method and technology of water holding rate, which is applied in the field of calculation of effective water holding rate of groundwater repaired by extraction method, and can solve the problems such as the decrease of soil permeability

Active Publication Date: 2021-02-02
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional extraction technology focuses on reducing the water content of the soil and improving the compactness of the soil through one-time extraction for a long time. Due to the drainage and consolidation of the soil, the permeability of the soil will also decrease.

Method used

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  • A Calculation Method of Effective Water Holdup Used in Groundwater Restoration by Extraction
  • A Calculation Method of Effective Water Holdup Used in Groundwater Restoration by Extraction
  • A Calculation Method of Effective Water Holdup Used in Groundwater Restoration by Extraction

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Experimental program
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Effect test

Embodiment 1

[0035]Embodiment 1: This embodiment specifically relates to a method for calculating the effective water holding rate of groundwater by extraction method. The groundwater that can be discharged by extraction includes gravity water that dissolves pollutants and weakly bound water that partially adsorbs pollutants. Strongly bound water does not dissolve or adsorb pollutants, nor can it be removed by extraction. In order to measure the effectiveness of extraction, the calculation method first defines the effective water holding rate: the remaining part of the weakly bound water and retained gravity water in the soil after the extraction, the volume of this part of the groundwater and the volume of the gravity water and bound water in advance The ratio of the total volume is the effective water holding rate S. The specific calculation formula is as follows:

[0036]

[0037]Where:

[0038]S is the effective water holding rate of the aquifer in the site to be repaired after extraction, dimensionl...

Embodiment 2

[0079]Example 2: Such asfigure 1As shown, this embodiment combines the effective water holdup calculation method in embodiment 1 with the actual project to illustrate; the soil layer within the depth of 10m of a groundwater contaminated site mainly includes the first layer of fill and the second layer of brown and yellow ~ Grayish yellow silty clay, the third layer of gray silty silty clay. During the survey of the groundwater contaminated site, the buried depth of the stable groundwater level in the borehole was about 1.0m.

[0080]The depth of groundwater pollution of the groundwater pollution site is generally within 6m, mainly involving the first layer, the second layer and the third layer of soil. In order to extract the contaminated groundwater, the extraction depth of the extraction well is set to 5m, and the extraction method adopts conventional light well points, and the vacuum degree is maintained at -65~-85kPa during the extraction process. According to the water content, po...

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Abstract

The invention discloses a method for calculating the effective water holding rate for repairing groundwater by the extraction method. The calculation method provides the definition of the effective water holding rate: after the extraction, there are still some weakly bound water and retained gravity water in the soil, The ratio of the volume occupied by this part of groundwater to the total volume of gravity water and bound water before pumping is defined as the effective water holdup S. The present invention has the advantages of providing a calculation method for the effective water holding rate of groundwater in low-permeable soil layers, the parameters involved in the method have fully considered the formation characteristics of soft soil areas and the law of groundwater occurrence, and the obtained results can extract groundwater. Quantitative evaluation of the effectiveness has important guiding significance for the extraction of low-permeability soil layers, especially the restoration of contaminated groundwater.

Description

Technical field[0001]The invention belongs to the technical field of environmental geotechnical engineering, and specifically relates to a calculation method for effective water holding rate used for extracting groundwater to repair groundwater.Background technique[0002]Groundwater extraction technology is a traditional technology in the field of geotechnical engineering, which is widely used in foundation pit engineering and foundation treatment engineering. By pumping the groundwater from the aquifer, the groundwater level and the water content of the soil can be reduced, so that the strength of the foundation soil is increased and the compressibility is reduced, thereby meeting the needs of engineering construction. Soil permeability, consolidation (compaction) degree and groundwater level changes are important metrics. Conventional extraction technology focuses on reducing the water content of the soil and improving the compactness of the soil through one-time extraction and lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 许丽萍李韬王蓉郭星宇沈超沈婷婷吴育林王克文王笑
Owner SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST