CN1776458A - Method for determining underground water extractable amount according to annual ground setting and pump-out - Google Patents
Method for determining underground water extractable amount according to annual ground setting and pump-out Download PDFInfo
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- CN1776458A CN1776458A CN 200510110425 CN200510110425A CN1776458A CN 1776458 A CN1776458 A CN 1776458A CN 200510110425 CN200510110425 CN 200510110425 CN 200510110425 A CN200510110425 A CN 200510110425A CN 1776458 A CN1776458 A CN 1776458A
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Abstract
The method includes following steps: (1) collecting field data of local land subsidence, and log of groundwater pumpage; (2) arranging relation between annual field data of local land subsidence and annual groundwater pumpage, and drawing up graph of relation; (3) carrying out regression analysis to annual field data of local land subsidence and annual groundwater pumpage so as to obtain polyline type regression formula; (4) calculating annual available produced quantity. If control value of annual local land subsidence is setup, then annual available groundwater pumpage can be determined. The method is compact, economic and effective determining annual available groundwater pumpage, and avoids lots of sampling and testing operation when complex mathematic model is adopted.
Description
Technical field
The present invention relates to a kind of method of environmental geology technical field, specifically be a kind of according to year ground settlement and pump-out determine the method for allowable groundwater withdrawal.
Background technology
Surface subsidence is under natural conditions and human factor effect, causes a kind of environmental geology phenomenon of regional ground elevation reduction owing to the contracting of veneer of crust soil pressure.Land subsidence is a kind of compression deformation of ground slowly process, and the be everlasting fixed place of taking place of those recent deposits of this phenomenon takes place.Land subsidence is as a kind of geologic hazard widely, cause the underground pipeline distortion to fracture, road is uneven, inwelling, buildings produces the crack because of uneven subsidence even collapses, not only surface facility is caused very big destruction, and underground environment is changed, the influence of bringing for commercial production, urban construction and people's life is deep and huge.The exploitation of the solid resource of underground current is the main cause that causes land subsidence.Before century, external just discovery is because the surface subsidence that groundwater mining causes more than one.Italy's present land subsidence speed in Piza Plain is 2-5 times of natural subsidence, and the monitoring that the degree of depth is reached the basal water water level of 250m shows that underground water table is overall downtrending, and Iranian Esfahan south also produces serious land subsidence because of mining of groundwater.Many places are also arranged owing to phreatic exploitation causes land subsidence in China, as Shanghai, Tianjin, ground such as Taiyuan.Many cities, especially coastland in the world, land subsidence have become a serious problem.Therefore, how correctly to describe seepage action of ground water, determine that allowable groundwater withdrawal is the key of ground settlement control.
Through existing technical literature retrieval is found, Li Qinfen, Founder, Wang Hanmei, in " Shanghai geology " 2000, No.2, the method of applied mathematical model PREDICTIVE CONTROL land subsidence allowable groundwater withdrawal has within the specific limits been introduced in " Shanghai City allowable groundwater withdrawal Model Calculation and the prediction " delivered on the pp.36-43, this article.Finite element numerical model also is to cause comparatively effective method commonly used in the computation of Land Subsidence analysis in groundwater mining.But, tallying with the actual situation for making result of calculation, primary condition, the border condition that need to correctly set seepage action of ground water reach the hydrogeologic condition at boundary, the water intaking situation of underground water etc.; What is more important needs correct determine on-the-spot soil nature and hydrologic parameter.More than several conditions in the setting of calculated with mathematical model, often need to expend huge manpower and just can obtain, especially the soil layer hydrologic parameter needs a large amount of borehole datas, by determining after scene and the laboratory test.Implement very uneconomical.
Summary of the invention
The present invention is directed to the deficiency in the above-mentioned existing method, provide a kind of according to year ground settlement and pump-out determine the method for allowable groundwater withdrawal, make its year ground settlement based on the somewhere directly determine the allowable exploitation of underground water with the relation of year amount of groundwater mining by regression analysis, solved the problem of predicting that difficulty and expense are big.
The present invention realizes by the following technical solutions, may further comprise the steps:
(1) collects the field data of local surface subsidence and the record of groundwater mining amount.In collecting the field data process, to from the time as far as possible early, the initial data of drawing water be arranged preferably.The year ground settlement that so just can make that the back does is better determined the allowable exploitation of underground water with year groundwater mining the relationship between quantities curve.
(2) ground settlement and amount of groundwater mining are organized into annual ground settlement and annual groundwater mining the relationship between quantities, and make graph of relation.Annual ground settlement represents that with the longitudinal axis yield of annual underground water represents that with transverse axis it can be analyzed with linear coordinate, also can analyze with the log coordinate.
(3) annual ground settlement and annual groundwater mining amount are carried out regretional analysis, obtain the broken line type regression equation: St=a-b Δ V (S
t-year ground settlement; Δ V-groundwater mining amount; A, b-regression coefficient).Regression analysis is the least square method with Function Fitting, for one group of given data (being annual yield and annual groundwater mining amount), find a function in function class, makes the error sum of squares minimum of itself and actual conditions.Thereby can obtain least square solution, namely will obtain regression equation.
(4) calculate a year allowable exploitation: based on above-mentioned regression relation, for the controlling value S of the year land subsidence of setting
t, then can obtain phreatic year allowable exploitation Δ V=(a-S
t)/b.
The principle of the invention is: the surface subsidence that causes of drawing water is because the extraction of underground water descends the underground water head in deposition water-bearing layer, and the effective stress in the soil increases, and causes fixed and takes place.But since around underground water in the water-bearing zone can do horizontal supply campaign to adopting the pool, when pumping rate (year pump-out) and additional speed reach balance, underground water table just no longer descends, and the effective stress on stratum no longer increases, and year amount of groundwater mining at this moment is an allowable exploitation.In addition, through a large amount of statistics discoveries, year ground settlement is the broken line relation with the pass of year allowable groundwater withdrawal, and this is similar with the relation (e-logP curve) of consolidation stress with consolidation test mesopore ratio.This explanation is as long as a year recovery of subterranean water yield is no more than certain value, and ground settlement just can be controlled in certain value.
The present invention has utilized the Given information of surface subsidence and groundwater mining amount, in conjunction with the dependency relation e-logP curve of the void ratio variation in the soil solidifying test with consolidation pressure, use the regression analysis in the mathematical statistics, determine with year ground settlement be controlled at allowable groundwater withdrawal in a certain scope.Need to carry out sampling when layer parameter is determined in large quantities and the work of test when having avoided like this using complicate mathematical model, be a kind of definite method of succinct, economic and effective allowable groundwater withdrawal.
The present invention not only can be used for mining of groundwater and cause determining of land subsidence, can also be used for the field that oil and natural gas extraction cause land subsidence.
Description of drawings
The relation of Fig. 1 void ratio and consolidation pressure (e-logP curve)
The relation of Fig. 2 ground settlement and year allowable groundwater withdrawal
Year ground settlement of Fig. 3 somewhere gas field and the relation of year allowable groundwater withdrawal
Embodiment
Provide following examples in conjunction with technical scheme of the present invention:
Embodiment:
Utilize this invention that the somewhere gas field is analyzed the allowable exploitation of deep phreatic water in the production of water-soluble natural gas.
The stratum in the area, the Northeast around this ground is to be formed through hundreds thousand of and even millions of years depositions by marine environment.Because it is underground that a large amount of sea life are deposited on, and through geologic function hundreds thousand of and even up to a million years, formed the water-soluble natural gas and the pharmaceutical iodine that have good quality.From the twenty or thirty age in last century the gas extraction activity is just arranged near Tokyo.From 99 li plains regions in this east, ground in 1956, begun the recovery activity of extensive natural gas and iodine.Open-air recovery activity is mainly by obtaining from underground 500～2000m depths groundwater abstraction.The sixties in last century find that in this area land subsidence is arranged, and play the observation of beginning land subsidence in 1969.Ground cumulative maximum sedimentation reaches 0.85m in the past 35 years.Find the nearly 800km of area of subsidence range
2The about 20m of retrogradation on 99 li ground of going sightseeing.So far (2002) annual large-area land subsidence reaches 20mm, and local maximum settlement reaches 40mm.
For this reason, need the yield of control underground water to alleviate or eliminate surface subsidence.The allowable exploitation of underground water determines to be exactly an of paramount importance problem like this.Specific as follows:
1, collects the surface subsidence data of this ground gas field and the extraction amount of underground water;
2, land subsidence and groundwater mining amount are by year put in order make to grow up settling amount and year clean yield relation as shown in Figure 3.As seen from the figure, in yield hour, settling amount is less.But when yield surpassed certain key value, settling amount sharply increased.The draw water increase of the additional effective stress that causes of this explanation has surpassed the yield stress (preconsolidation pressure) on stratum, makes the e-logP relation reach the normal consolidation state, as shown in Figure 1.
3, to year settling amount carry out regression analysis with a year clean yield, obtain following two relational expressions:
Δ V＜57.7 (* 10
6m
3/ year), S
t=3.82-0.102 Δ V (cm) (A line among Fig. 3) 1)
Δ V＞57.7 (* 10
6m
3/ year), S
t=22.17-0.42 Δ V (cm) (B line among Fig. 3) 2)
4, determining of underground water year allowable exploitation:
The surface subsidence of setting this area no longer takes place, then by making St=0, substitution 1) formula, then Δ V=37.5 * 10
6m
3, namely the underground water year yield of this area is 37.5 * 10
6m
3
The year settling amount of setting this area is controlled in the 10mm, then by making St=-1, substitution 1) formula, then Δ V=47.3 * 10
6m
3, namely the underground water year yield of this area is 47.3 * 10
6m
3
The year settling amount of setting this area is controlled in the 20mm, then by making St=-2, substitution 1) formula, then Δ V=57.1 * 10
6m
3, namely the underground water year yield of this area is 57.1 * 10
6m
3
The year settling amount of setting this area is controlled in the 30mm, then by making St=-3, substitution 2) formula, then Δ V=59.9 * 10
6m
3, namely the underground water year yield of this area is 59.9 * 10
6m
3
Hence one can see that, utilizes the present invention to determine that the allowable groundwater withdrawal in somewhere does not need the soil nature parameter on degree of depth stratum, do not need sampling and experiment work.The data of only collecting existing settlement observation data and groundwater mining gets final product.Method very easily and effectively.And grasp the data that a large amount of settling amounts and groundwater mining amount are arranged about administrative department, from then on starting with, to analyze be very cost-effective.
Claims (4)
1, a kind of according to year ground settlement and pump-out determine to it is characterized in that the method for allowable groundwater withdrawal, may further comprise the steps:
(1) collects the field data of local surface subsidence and the record of groundwater mining amount;
(2) with ground settlement and the adult ground settlement of amount of groundwater mining arrangement and a year groundwater mining the relationship between quantities, and make graph of relation;
(3) to year ground settlement carry out regretional analysis with a year groundwater mining amount, obtain broken line type regression equation: S
t=a-b Δ V, wherein, S
t-year ground settlement; Δ V-groundwater mining amount; A, b-regression coefficient;
(4) calculate a year allowable exploitation: based on above-mentioned regression relation, for the controlling value S of the year land subsidence of setting
t, then obtain phreatic year allowable exploitation Δ V=(a-S
t)/b.
2, according to claim 1 according to year ground settlement and pump-out determine the method for allowable groundwater withdrawal, it is characterized in that, in the step (2), described graph of relation, annual ground settlement is represented with the longitudinal axis, year, phreatic yield represented that with transverse axis it is analyzed with linear coordinate, perhaps analyzed with the log coordinate.
3, according to claim 1 according to year ground settlement and pump-out determine the method for allowable groundwater withdrawal, it is characterized in that, in the step (3), regression analysis is the least square method with the function match, for one group of given data is annual yield and annual groundwater mining amount, find a function in function class, makes the error sum of squares minimum of itself and actual conditions, thereby obtain least square solution, promptly will obtain regression equation.
4, according to claim 1 according to year ground settlement and pump-out determine the method for allowable groundwater withdrawal, it is characterized in that, in the step (1), will be in collecting the field data process from the time as far as possible early, the year ground settlement that the back is done is better determined phreatic allowable exploitation with year relation curve of groundwater mining amount.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713185B (en) * | 2009-11-26 | 2011-01-19 | 上海交通大学 | Ground subsidence control constructing method |
| CN104091063A (en) * | 2014-07-01 | 2014-10-08 | 天津市水文水资源勘测管理中心 | Method for using regression analysis for determining groundwater control level |
| CN109902416A (en) * | 2019-03-08 | 2019-06-18 | 安徽农业大学 | A kind of surface subsidence multivariate mathematical relationship |
| CN111709598A (en) * | 2020-04-28 | 2020-09-25 | 中国地质调查局南京地质调查中心(华东地质科技创新中心) | Multi-field coupling model-based underground water system environment capacity evaluation method |
| CN112948481A (en) * | 2021-02-26 | 2021-06-11 | 澜途集思生态科技集团有限公司 | Method for determining available quantity of urban underground water |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2158944C1 (en) * | 1999-03-29 | 2000-11-10 | Открытое акционерное общество "Уралкалий" | Method for monitoring of geological environment in potassium mines |
-
2005
- 2005-11-17 CN CNB2005101104259A patent/CN100451681C/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713185B (en) * | 2009-11-26 | 2011-01-19 | 上海交通大学 | Ground subsidence control constructing method |
| CN104091063A (en) * | 2014-07-01 | 2014-10-08 | 天津市水文水资源勘测管理中心 | Method for using regression analysis for determining groundwater control level |
| CN109902416A (en) * | 2019-03-08 | 2019-06-18 | 安徽农业大学 | A kind of surface subsidence multivariate mathematical relationship |
| CN109902416B (en) * | 2019-03-08 | 2023-09-12 | 安徽农业大学 | Ground subsidence multivariable mathematical relationship calculation method |
| CN111709598A (en) * | 2020-04-28 | 2020-09-25 | 中国地质调查局南京地质调查中心(华东地质科技创新中心) | Multi-field coupling model-based underground water system environment capacity evaluation method |
| CN111709598B (en) * | 2020-04-28 | 2023-06-20 | 中国地质调查局南京地质调查中心(华东地质科技创新中心) | Groundwater system environment capacity evaluation method based on multi-field coupling model |
| CN112948481A (en) * | 2021-02-26 | 2021-06-11 | 澜途集思生态科技集团有限公司 | Method for determining available quantity of urban underground water |
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|---|---|
| CN100451681C (en) | 2009-01-14 |
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Address after: No. 9, Wuhou District grass road, Wuhou District, Chengdu, Sichuan Patentee after: CITIC Guoan Construction Group Co., Ltd. Address before: 610045 Yongkang Road, Wuhou District, Chengdu, Sichuan Province, No. 195 Patentee before: Sichuan Shengmao Construction Co., Ltd. |