CN107832491B - Effective water holding rate calculation method for underground water restoration by extraction method - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 238000000605 extraction Methods 0.000 title claims abstract description 41
- 238000004364 calculation method Methods 0.000 title claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000003673 groundwater Substances 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 239000012223 aqueous fraction Substances 0.000 claims description 4
- 230000036571 hydration Effects 0.000 claims 1
- 238000006703 hydration reaction Methods 0.000 claims 1
- 230000005484 gravity Effects 0.000 abstract description 6
- 238000005067 remediation Methods 0.000 abstract description 4
- 230000000717 retained effect Effects 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 239000002245 particle Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000003809 water extraction Methods 0.000 description 3
- 238000003911 water pollution Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a method for calculating effective water holding rate for repairing underground water by an extraction method, which provides the definition of the effective water holding rate: and (3) remaining part of weakly bound water and retained gravity water in the extracted soil body, wherein the ratio of the volume of the part of underground water to the total volume of the gravity water and the bound water before extraction is defined as the effective water holding rate S. The invention has the advantages that: the method provides a calculation method for the effective water retention rate of the underground water in the low-permeability soil layer, the parameters related by the method fully consider the stratum characteristics and the occurrence rule of the underground water in the soft soil area, the obtained result can quantitatively evaluate the extraction effectiveness of the underground water, and the method has important guiding significance for the extraction operation engineering of the low-permeability soil layer, particularly the polluted underground water remediation engineering.
Description
Technical Field
The invention belongs to the technical field of environmental geotechnical engineering, and particularly relates to an effective water holding rate calculation method for groundwater remediation by an extraction method.
Background
The underground water extraction technology is a traditional technology in the field of geotechnical engineering and is widely applied to the aspects of foundation pit engineering, foundation treatment engineering and the like. By pumping the groundwater out of the aquifer, the groundwater level and the soil body water content can be reduced, the strength of the foundation soil is improved, the compressibility is reduced, and therefore the requirement of engineering construction is met. The permeability, consolidation (compaction) degree, groundwater level change and the like of the soil body are important measurement indexes. The conventional extraction technology focuses on reducing the water content of the soil body and improving the compactness of the soil body through one-time extraction for a long time, and the permeability of the soil body is also reduced due to drainage consolidation of the soil body.
However, due to the need of pollution site treatment in recent years, part of underground water extraction projects are more focused on the efficiency of pollutant removal and the control of the spatial distribution range of pollutants, and generally need to be subjected to multiple extractions, and have higher requirements on single extraction effect. Meanwhile, under the influence of hydrogeological conditions and interaction between an aquifer medium and pollutants, tailing and rebounding phenomena are easy to occur after the technology is applied, and the extraction running time is greatly prolonged.
The low-permeability soil layer represented by the shallow diving aquifer of the sea area has high water-binding ratio, low water supply degree, high water retention degree and poor permeability, and is easy to adsorb pollutants. A small amount of trial applications carried out in Shanghai areas in recent years show that the traditional extraction technology effectiveness evaluation is not suitable for the fields, and a groundwater extraction effectiveness evaluation method suitable for low-permeability soil layers is necessary, wherein the effective extraction rate is one of important parameters for evaluating groundwater extraction effectiveness.
Disclosure of Invention
The invention aims to provide a method for calculating the effective water retention rate for repairing underground water by an extraction method according to the defects of the prior art, wherein the calculation method is used for evaluating the underground water extraction effectiveness of a low-permeability soil layer by defining the effective water retention rate and calculating the effective water retention rate according to a corresponding definition formula.
The purpose of the invention is realized by the following technical scheme:
a method for calculating an effective water holding rate for extracting and repairing underground water is characterized in that the method for calculating the effective water holding rate comprises the following steps:
in the formula:
s is the effective water holding rate after the extraction of the water-containing layer in the site to be repaired, and is dimensionless;
mu is the water supply degree of a water-containing layer in the site to be repaired, and is dimensionless;
n is the porosity of the soil sample of the site to be repaired, and is dimensionless;
ngthe porosity of the strong bonding water part of the field to be repaired is dimensionless.
The method is characterized in that the aquifer water supply degree mu refers to the volume of water released under the action of external force when the underground water level in the aquifer drops by unit volume, and the calculation formula is as follows:
in the formula:
△Vwthe volume of water released under the action of external force after the underground water level of the aquifer is reduced is L3；
V is the total volume of the soil sample in the field to be repaired and the unit is L3。
The porosity n of the soil sample refers to the ratio of the sum of all pore space volumes in the soil sample to the volume of the soil sample, and the calculation formula is as follows:
in the formula:
Vwis the volume of pore water in a soil sample in the field to be repaired, and the unit is L3；
V is the total volume of the soil sample in the field to be repaired and the unit is L3。
The strongly bound water fraction occupies a porosity ngThe calculation formula of (2) is as follows:
in the formula:
ρwecarrying out M/L cultivation on the average density of the strongly bound water in the site to be repaired;
ρwtcarrying out M/L cultivation on underground water in the site to be restored according to the density at t ℃;
ρscarrying out M/L high speed planting on the soil grain density of the soil sample in the site to be restored;
wgthe content of strong binding water in the field to be repaired accounts for the weight percentage of dry soil, wg=0.885wp，wpThe plastic limit water content of cohesive soil is dimensionless;
and w is the water content of the soil sample in the field to be repaired and is dimensionless.
The invention has the advantages that: the method provides a calculation method for the effective water retention rate of the underground water in the low-permeability soil layer, the parameters related by the method fully consider the stratum characteristics and the occurrence rule of the underground water in the soft soil area, the obtained result can quantitatively evaluate the extraction effectiveness of the underground water, and the method has important guiding significance for the extraction operation engineering of the low-permeability soil layer, particularly the polluted underground water remediation engineering.
Drawings
Fig. 1 is a typical geological profile of a groundwater contaminated site to be remediated in example 2 of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
example 1: the embodiment specifically relates to a method for calculating the effective water holding rate for repairing underground water by an extraction method, wherein the underground water which can be discharged by extraction comprises gravity water for dissolving pollutants and weak bound water for partially adsorbing the pollutants, and the strong bound water partially does not dissolve or adsorb the pollutants and cannot be removed by an extraction method. To measure the effectiveness of extraction, the calculation method first defines the effective water holding rate: and (3) remaining part of weakly bound water and retained gravity water in the extracted soil body, wherein the ratio of the volume of the part of underground water to the total volume of the gravity water and the bound water before extraction is the effective water holding rate S. The specific calculation formula is as follows:
in the formula:
s is the effective water holding rate after the extraction of the water-containing layer in the site to be repaired, and is dimensionless;
mu is the water supply degree of a water-containing layer in the site to be repaired, and is dimensionless;
n is the porosity of the soil sample of the site to be repaired, and is dimensionless;
ngthe porosity of the strong bonding water part of the field to be repaired is dimensionless.
A specific description of each of the above mentioned parameters is as follows:
(1) degree of water supply of aquifer mu
The aquifer feed water degree mu represents the volume of water released under the action of external force when the underground water level in the aquifer drops by unit volume, and the specific calculation formula is as follows:
in the formula:
△Vwthe volume of water released under the action of external force after the underground water level of the aquifer in the site to be repaired is reduced is L3(ii) a I.e., Δ VwWhere A is the area of the aquifer and is expressed by L2(ii) a Delta h is the underground water level descending amount of the aquifer, and the unit is L;
v is the total volume of the soil sample in the field to be repaired and the unit is L3。
(2) Porosity n of soil sample
The porosity n of the soil sample represents the ratio of the sum of all pore space volumes in the soil sample in the site to be restored to the volume of the soil sample, and is called the porosity or total porosity of the soil sample, and the specific calculation formula is as follows:
in the formula:
Vwis the volume of pore water in a soil sample of a field to be repaired and has the unit of L3；
V is the total volume of the soil sample of the field to be restored, and the unit is L3。
(3) Porosity n occupied by strongly bound water fractiong
The calculation method of the porosity n occupied by the strongly bonded water part comprises the following steps:
a) taking a proper amount of dry soil sample in a field to be restored, and carrying out the following operation tests in a volumetric flask: when the dry soil sample soil particles are soaked in water, water molecules are wedged among the soil particles to disperse the soil particles, and the soil particles absorb a part of water as bound water; when the water is converted from gravity water to strong binding water, the density is increased and the volume is reduced, and the total amount of the strong binding water can be calculated according to the volume change; the ratio of the content of the strongly bound water to the weight of the dry soil is calculated by the following formula:
wherein the content of the first and second substances,
in the above formula:
wgthe content of the strongly bound water accounts for the weight percentage of the dry soil, and the soil is dimensionless;
ρwecarrying out the high binding water average density and the unit is M/L cultivation;
ρwtcarrying out M/L cultivation on underground water according to the density of the underground water at t ℃;
msis the quality of the dry soil sample, and the unit is M;
b) the test person, based on the results of a number of tests in volumetric flasks, has established the following relationship:
wg=0.885wp
in the formula, wpThe plastic limit water content of cohesive soil is dimensionless;
c) since the strong binding water is denser than the ground water of other components, the porosity can be corrected by the following formula:
and the strongly bound water fraction occupies a porosity ngComprises the following steps:
in the formula:
ρwecarrying out M/L (M/L) cultivation, specifically 1.3M/L cultivation, on the basis of the average density of strongly bound water in the site to be repaired;
ρwtcarrying out M/L cultivation on the underground water in the site to be restored according to the density at t ℃;
ρscarrying out M/L cultivation on the soil grain density of the dry soil sample in the site to be restored;
wgthe content of strongly bound water is the percentage of the dry soil weight, wg=0.885wp，wpThe plastic limit water content of cohesive soil is dimensionless;
and w is the water content of the soil sample in the field to be repaired and is dimensionless.
The beneficial effect of this embodiment lies in: the method provides a calculation method for the effective water retention rate of the underground water in the low-permeability soil layer, the parameters related by the method fully consider the stratum characteristics and the occurrence rule of the underground water in the soft soil area, the obtained result can quantitatively evaluate the extraction effectiveness of the underground water, and the method has important guiding significance for the extraction operation engineering of the low-permeability soil layer, particularly the polluted underground water remediation engineering.
Example 2: as shown in fig. 1, the present embodiment describes the method for calculating the effective water holding rate in embodiment 1 with reference to an actual process; the soil layer mainly comprises first layer filling soil, second layer brown yellow-gray yellow silty clay and third layer gray silty clay within the depth range of 10m of a certain underground water polluted site. And measuring the stable water level burial depth of the underground water in the drill hole by about 1.0m during the investigation period of the underground water pollution site.
The underground water pollution depth of the underground water pollution site is generally within 6m, and mainly relates to the first layer, the second layer and the third layer of soil. In order to pump out the polluted underground water, the extraction depth of the extraction well is set to be 5m, the extraction mode adopts a conventional light well point, and the vacuum degree is maintained to be-65 to-85 kPa in the extraction process. According to the parameters of the water content, the porosity, the plastic limit and the like of each soil layer obtained by the sampling test before and after extraction, the parameters of the water content of the bound water, the porosity occupied by the bound water, the water supply degree after extraction, the effective extraction rate, the effective water holding rate and the like are calculated according to the formula in the embodiment 1 and are shown in the following table 1.
Table 1: relevant parameter table after 15d of light well point extraction
The results from the table show that:
(1) after the conventional light well point is adopted for extraction for 15d, the maximum reduction amount of the water content of the soil on the second layer and the third layer is respectively 2.6 percent and 3.9 percent, the effective extraction rate delta is 0.20, and the effective water retention rate S reflected by the residual water content of the soil body is 0.80;
(2) the effective extraction rate result shows that the extraction effect of the pumping system on each soil layer is relatively close, and pollutants can be uniformly pumped out.
Claims (3)
1. A method for calculating an effective water holding rate for extracting and repairing underground water is characterized in that the method for calculating the effective water holding rate comprises the following steps:
in the formula:
s is the effective water holding rate after the extraction of the water-containing layer in the site to be repaired, and is dimensionless;
mu is the water supply degree of a water-containing layer in the site to be repaired, and is dimensionless;
n is the porosity of the soil sample of the site to be repaired, and is dimensionless;
ngthe porosity of the strong bonding water part of the field to be repaired is dimensionless;
the strongly bound water fraction occupies a porosity ngThe calculation formula of (2) is as follows:
in the formula:
ρwecarrying out M/L cultivation on the average density of the strongly bound water in the site to be repaired;
ρwtcarrying out M/L cultivation on underground water in the site to be restored according to the density at t ℃;
ρscarrying out M/L high speed planting on the soil grain density of the soil sample in the site to be restored;
wgthe content of strong binding water in the field to be repaired accounts for the weight percentage of dry soil, wg=0.885wp，wpThe plastic limit water content of cohesive soil is dimensionless;
and w is the water content of the soil sample in the field to be repaired and is dimensionless.
2. The method of claim 1, wherein the aquifer hydration degree μ is a volume of water released by an external force when the groundwater level in the aquifer drops by a unit volume, and is calculated by the formula:
in the formula:
△Vwthe volume of water released under the action of external force after the underground water level of the aquifer is reduced is L3；
V is the total volume of the soil sample in the field to be repaired and the unit is L3。
3. The method for calculating the effective water holding rate for extracting and restoring underground water according to claim 1, wherein the porosity n of the soil sample is the ratio of the sum of all pore space volumes in the soil sample to the volume of the soil sample, and the calculation formula is as follows:
in the formula:
Vwis the volume of pore water in a soil sample in the field to be repaired, and the unit is L3；
V is the total volume of the soil sample in the field to be repaired and the unit is L3。
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| JP2013050022A (en) * | 2012-11-06 | 2013-03-14 | Giken Kogyo Kk | Weed-proof treatment method for road slope and others |
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| CN106777688A (en) * | 2016-12-15 | 2017-05-31 | 中国水利水电科学研究院 | A kind of erosion and torrent control works runoff and sedimentation reduction method for quantitatively evaluating |
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| CN108314106B (en) * | 2014-12-24 | 2020-12-29 | 环境保护部南京环境科学研究所 | DNAPL (deoxyribonucleic acid-styrene-acrylonitrile copolymer) polluted underground water in-situ remediation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013050022A (en) * | 2012-11-06 | 2013-03-14 | Giken Kogyo Kk | Weed-proof treatment method for road slope and others |
| CN106049644A (en) * | 2016-07-25 | 2016-10-26 | 上海市城市排水有限公司 | Detection boring rapid restoration support mould apparatus for concrete drain pipe culvert and restoration method thereof |
| CN106777688A (en) * | 2016-12-15 | 2017-05-31 | 中国水利水电科学研究院 | A kind of erosion and torrent control works runoff and sedimentation reduction method for quantitatively evaluating |
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