CN108090291A - A kind of computational methods for predicting artesian water suspended cutoff Pit Discharge - Google Patents
A kind of computational methods for predicting artesian water suspended cutoff Pit Discharge Download PDFInfo
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- CN108090291A CN108090291A CN201711411916.6A CN201711411916A CN108090291A CN 108090291 A CN108090291 A CN 108090291A CN 201711411916 A CN201711411916 A CN 201711411916A CN 108090291 A CN108090291 A CN 108090291A
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Abstract
The invention discloses a kind of computational methods for predicting artesian water suspended cutoff Pit Discharge.Its key points of the technical solution are that comprise the following steps：According to design drawing, the area of plane, precipitation depth, infiltration coefficient and the artesian aquifer thickness of foundation pit are determined；Equivalent foundation pit radius r is obtained according to big well method formula0, radius of influence R is obtained according to dewatering well radius of influence calculation formula；Compare artesian aquifer thickness M and equivalent foundation pit radius r0Magnitude relationship, choose different artesian well shaft bottom water inlet water yield calculation formula；It brings correlation values into artesian well shaft bottom water inlet water yield calculation formula, water yield Q is obtained.Artesian water suspended cutoff Pit Discharge is calculated using this method, step is simple, calculates simplicity, and result of calculation stability is good, will not make simulation and forecast distortion due to artificially given current border is improper.
Description
Technical field
The present invention relates to the prediction of Pit Discharge, more particularly to a kind of prediction artesian water suspended cutoff Pit Discharge
Computational methods.
Background technology
As shown in Figure 1, underground water is different by mode of occurence, perched water 11, diving 12, artesian water 13 can be divided into.
Perched water 11 is due to the impermeable role of local water barrier 31, and the Atmospheric precipitation oozed under making rests on the rock of shallow-layer
Water-accumulating body formed in stony fracture seam or sedimentary.
Diving 12 be imbedded in below earth's surface, first stables water barrier more than 3, with table 121 bulk water.
The underground water being typically seen is diving 12 mostly.
Artesian water 13 is the underground water for burying deeper, preservation between two water barriers 3.Artesian water 13 often have compared with
Big water pressure.When well or when drilling through 3 upper strata top plate of water barrier, powerful water pressure will make water body gush, shape
Into artesian water.
At present, as shown in Fig. 2, it is necessary to carry out prediction calculating to the water yield of foundation pit 4 before 4 dewatering construction of foundation pit.Suspension type
Curtain foundation pit refers to that the bottom of water-stop curtain 5 does not penetrate the foundation pit 4 in water-bearing layer, and it is aqueous that the shaft bottom of designing precipitation well 6 is located at pressure-bearing
During the inside of layer 7, it is referred to as artesian water suspended cutoff foundation pit.At present, carried out for such foundation pit 4 generally by numerical method
The prediction of water yield.
Numerical method is widely used in as a kind of method for solving approximate solution in forecast groundwater level and resource assessment, leads to
It crosses Simulation of Groundwater Flow and draws the flow direction of underground water and the relation of underground water head and time, and then predict that various precipitation schemes are taken out
The variation of level of ground water under water condition, can preferably reflect under Complex Hydrogeological Conditions and precipitation condition under ground water field
Situation of change has higher fidelity.Numerical method needs application simulation software, and main simulation softward has GMS, FEFLOW
With Visual MODFLOW etc..Wherein Visual MODFLOW are the most popular in the world at present.
But with the water yield of numerical method prediction artesian water suspended cutoff foundation pit, it is necessary to establish model, mesh refinement, add
Add operation more than ten step such as pumped well and given flow boundary condition, moreover, need to be by the data of foundation pit, the number of each dewatering well
According to must adjusting parameter, operation be time-consuming and laborious repeatedly in the data input softwares such as geological condition, after dry run.Moreover,
The step for given flow boundary condition, is particularly significant for simulation and forecast, however the given often difficult point of boundary condition,
Precision of prediction is caused to fall sharply so that the example of analog distortion is not some phenomena due to artificially giving the improper of current border.
The content of the invention
The object of the present invention is to provide a kind of method using analytic calculation artesian water suspended cutoff Pit Discharge,
This method step is simple, calculates brief, and result of calculation stability is good, simulation will not be made pre- when artificially setting current border improper
Dendrometry is true.
It is a further object to provide a kind of construction methods of suspended cutoff foundation pit, and this method can be in foundation pit
Pit Discharge is more effectively predicted before excavating, prevents occurring water burst accident in Excavation Process.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of computational methods for predicting artesian water suspended cutoff Pit Discharge comprise the following steps：
Step a, according to design drawing, determine that area of plane A, precipitation depth S, osmotic coefficient k and the artesian aquifer of foundation pit are thick
Spend M；
Step b, equivalent foundation pit radius r is obtained according to big well method formula0, influence is obtained according to dewatering well radius of influence calculation formula
Radius R；
Step c, artesian aquifer thickness M and equivalent foundation pit radius r are compared0Magnitude relationship, choose different artesian well shaft bottoms
Water inlet water yield calculation formula；
Step d, correlation values are brought into artesian well shaft bottom water inlet water yield calculation formula, water yield Q is obtained.
By using above-mentioned technical proposal, artesian water suspended cutoff Pit Discharge, this method can be quickly calculated
Step is simple, calculates brief, and result of calculation stability is good, will not make simulation and forecast distortion when artificially setting border improper.
A kind of construction method of suspended cutoff foundation pit before excavation of foundation pit, is held using the method prediction in claim 1
Press water suspended cutoff Pit Discharge.
By using above-mentioned technical proposal, Pit Discharge is more effectively predicted before excavation of foundation pit, prevents foundation pit
Occurs water burst accident in digging process.
In conclusion the invention has the advantages that：
1st, artesian water suspended cutoff Pit Discharge can be quickly calculated, this method step is simple, calculates brief, calculating knot
Fruit stability is good, will not make simulation and forecast distortion when artificially setting border improper；
2nd, Pit Discharge is more effectively predicted before excavation of foundation pit, can prevents occurring water burst thing in Excavation Process
Therefore.
Description of the drawings
Fig. 1 is background technology Groundwater Classification schematic diagram；
Fig. 2 is artesian water suspended cutoff foundation pit schematic diagram；
Fig. 3 is diving suspended cutoff foundation pit schematic diagram.
In figure, 11, perched water；12nd, dive under water；13rd, artesian water；2nd, water table aquifer；3rd, water barrier；31st, local water barrier；4、
Foundation pit；5th, water-stop curtain；6th, dewatering well；7th, artesian aquifer；71st, artesian water water level；8th, station structure bottom plate.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing.The identical reference numeral of wherein identical parts
It represents.It should be noted that word "front", "rear" used in the following description, "left", "right", " on ", " under ", " bottom surface " and
" top surface " refers to the direction in attached drawing, and word " interior " and " outer " are referred respectively to towards or away from particular elements geometric center
Direction.
Embodiment one：
The present embodiment by taking a subway station precipitation as an example, the station using two layers of underground twin columns three across structure type, use
The open-cut station of cast-in-situ bored pile+bracing members form.
A kind of computational methods for predicting artesian water suspended cutoff Pit Discharge, comprise the following steps：
Step a, according to design drawing, area of plane A=5236m2, the osmotic coefficient k=5.3m/d of foundation pit 4, as shown in Fig. 2,
The bottom absolute altitude of water-stop curtain 5 is 754.124.Artesian water water level 71 is 782.19, and the absolute altitude of station structure bottom plate 8 is 765.124,
Consider according to head is down to structure base slab 0.5m below 8, precipitation depth S=17.566m；The top elevation of artesian aquifer 7 is
765.89m, the floor level of artesian aquifer 7 are 750.14m, thickness M=top elevation-floor level of artesian aquifer 7=
15.75m。
Step b, equivalent foundation pit radius r is obtained according to big well method formula0, it is obtained according to dewatering well radius of influence calculation formula
Radius of influence R；
=240.62m。
Step c, artesian aquifer thickness M and equivalent foundation pit radius r are compared0Magnitude relationship, choose different artesian wells
Shaft bottom water inlet water yield calculation formula；
Due to M ＜ 2r0, using formula
。
Step d, by correlation values bring into artesian well shaft bottom water inlet water yield calculation formula, be obtained water yield Q, Q=
4292.8m3。
As seen in Figure 2, foundation pit 4 is influenced by one layer of water table aquifer 2 and one layer of artesian aquifer 7, and lower floor's pressure-bearing contains
The water yield of water layer 7 is calculated according to above-mentioned steps, and 2 part water yield of water table aquifer is according to bottomed curtain water stop+draining system
Water yield is calculated, the computational methods of the part belong to the prior art, are not specifically described herein.
Although in above technical scheme, artesian well shaft bottom water inlet water yield calculation formula and big well method formula are existing
Technology, artesian well shaft bottom water inlet water yield calculation formula are a kind of situations in the water yield calculation formula selected from large open well.But
It is the water yield calculation formula of large open well（Including the formula in the program）It is only applied to individual well at present.And in base pit dewatering work
Cheng Zhong, the not only a well of dewatering well 6 being arranged in foundation pit, but group wells.So the invention is to regard whole foundation pit 4 as one
The big well of mouth, equivalent foundation pit radius r is calculated using big well method formula0Afterwards, then bring into artesian well shaft bottom water inlet water yield calculate it is public
In formula, so as to which water yield be obtained.
It is pointed out that in the water yield calculation formula of existing large open well, the water inlet of artesian well shaft bottom is not only included and is gushed
Water calculation formula further includes a variety of situations such as the calculation formula of water yield of phreatic well shaft bottom water inlet.As shown in figure 3, when drop
When the shaft bottom of well 6 and the bottom of water-stop curtain 5 are respectively positioned on the inside of phreatic aquifer 9, then phreatic well shaft bottom cannot be used to intake
Water yield calculation formula carries out prediction calculating, because the water yield deviation that the situation calculates can be very big.
Embodiment two：
With embodiment one the difference is that：As radius rs of the artesian aquifer thickness M than well0At big eight to ten times or more, use
Following formula calculates the water yield of artesian aquifer 7：
。
Embodiment three：
With embodiment one the difference is that：Work as 8r0＞ M >=2r0When, with the water yield of following formula calculating artesian aquifer 7：
。
Example IV：
A kind of construction method of suspended cutoff foundation pit：Before excavation of foundation pit, artesian water is predicted using the method in embodiment one
Suspended cutoff Pit Discharge.Then according to the water yield calculated, designing precipitation scheme, with reference to earth formation and water burst system
The parameters such as number determine the specific dewatering measure such as the well depth of dewatering well, spacing.
By look-ahead and rational precipitation scheme is set, so as to prevent occurring water burst accident in Excavation Process,
Improve the security of excavation of foundation pit.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, people in the art
Member can as needed make the present embodiment the modification of no creative contribution after this specification is read, but as long as at this
It is all protected in the right of invention be subject to Patent Law.
Claims (5)
1. a kind of computational methods for predicting artesian water suspended cutoff Pit Discharge, it is characterised in that：Comprise the following steps：
Step a, according to design drawing, determine that area of plane A, precipitation depth S, osmotic coefficient k and the artesian aquifer of foundation pit are thick
Spend M；
Step b, equivalent foundation pit radius r is obtained according to big well method formula0, influence is obtained according to dewatering well radius of influence calculation formula
Radius R；
Step c, artesian aquifer thickness M and equivalent foundation pit radius r are compared0Magnitude relationship, choose different artesian well shaft bottoms into
Water water yield calculation formula；
Step d, correlation values are brought into artesian well shaft bottom water inlet water yield calculation formula, water yield Q is obtained.
2. a kind of computational methods for predicting artesian water suspended cutoff Pit Discharge according to claim 1, feature
It is：As radius rs of the artesian aquifer thickness M than well0At big eight to ten times or more, the water yield Q is calculated with following formula：。
3. a kind of computational methods for predicting artesian water suspended cutoff Pit Discharge according to claim 1, feature
It is：Work as 8r0＞ M >=2r0When, calculate the water yield Q with following formula：。
4. a kind of computational methods for predicting artesian water suspended cutoff Pit Discharge according to claim 1, feature
It is：As M ＜ 2r0When, calculate the water yield Q with following formula：。
5. a kind of construction method of suspended cutoff foundation pit, it is characterised in that：Before excavation of foundation pit, using in claim 1
Method predicts artesian water suspended cutoff Pit Discharge.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109213966A (en) * | 2018-09-25 | 2019-01-15 | 深圳市工勘岩土集团有限公司 | Suspension type waterproof of man is around infiltration water yield calculation method |
| CN109614654A (en) * | 2018-11-13 | 2019-04-12 | 烟台大学 | A kind of accurate method for obtaining the base pit dewatering well radius of influence |
| CN109854231A (en) * | 2019-01-16 | 2019-06-07 | 中国矿业大学 | A kind of method of the equivalent well radius of determining multi-layered aquifer mixed pumping water |
| CN110055989A (en) * | 2019-05-10 | 2019-07-26 | 中南大学 | Method is determined based on the suspended cutoff Foundation Pit with Confined Water pump-out of three-dimensional drawdown |
| CN110232245A (en) * | 2019-06-14 | 2019-09-13 | 中南大学 | Suspended cutoff Foundation Pit with Confined Water pumping with constant rate three-dimensional flow field water level distribution determination method |
| CN110863504A (en) * | 2019-12-02 | 2020-03-06 | 河南科技大学 | Pipe well dewatering construction method |
| CN111027127A (en) * | 2019-12-27 | 2020-04-17 | 深圳市工勘岩土集团有限公司 | Method for calculating constant water head water inflow of foundation pit |
| CN112380594A (en) * | 2020-10-10 | 2021-02-19 | 上海市政工程设计研究总院（集团）有限公司 | Pit bottom confined water-based foundation pit wall bottom anti-uplift stability calculation method |
| CN112926111A (en) * | 2021-01-25 | 2021-06-08 | 中国地质大学（武汉） | Suspended curtain foundation pit seepage calculation method based on improved resistance coefficient method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109213966A (en) * | 2018-09-25 | 2019-01-15 | 深圳市工勘岩土集团有限公司 | Suspension type waterproof of man is around infiltration water yield calculation method |
| CN109213966B (en) * | 2018-09-25 | 2023-05-23 | 深圳市工勘岩土集团有限公司 | Method for calculating water inflow around seepage of suspension type water interception curtain |
| CN109614654A (en) * | 2018-11-13 | 2019-04-12 | 烟台大学 | A kind of accurate method for obtaining the base pit dewatering well radius of influence |
| CN109614654B (en) * | 2018-11-13 | 2022-11-01 | 烟台大学 | Method for accurately acquiring influence radius of foundation pit dewatering well |
| CN109854231B (en) * | 2019-01-16 | 2022-09-16 | 中国矿业大学 | Method for determining radius of multilayer aquifer mixed pumping equivalent well |
| CN109854231A (en) * | 2019-01-16 | 2019-06-07 | 中国矿业大学 | A kind of method of the equivalent well radius of determining multi-layered aquifer mixed pumping water |
| CN110055989A (en) * | 2019-05-10 | 2019-07-26 | 中南大学 | Method is determined based on the suspended cutoff Foundation Pit with Confined Water pump-out of three-dimensional drawdown |
| CN110232245B (en) * | 2019-06-14 | 2022-12-09 | 中南大学 | Method for determining water level distribution of constant-flow pumping three-dimensional flow field of suspended curtain confined water foundation pit |
| CN110232245A (en) * | 2019-06-14 | 2019-09-13 | 中南大学 | Suspended cutoff Foundation Pit with Confined Water pumping with constant rate three-dimensional flow field water level distribution determination method |
| CN110863504A (en) * | 2019-12-02 | 2020-03-06 | 河南科技大学 | Pipe well dewatering construction method |
| CN111027127A (en) * | 2019-12-27 | 2020-04-17 | 深圳市工勘岩土集团有限公司 | Method for calculating constant water head water inflow of foundation pit |
| CN112380594A (en) * | 2020-10-10 | 2021-02-19 | 上海市政工程设计研究总院（集团）有限公司 | Pit bottom confined water-based foundation pit wall bottom anti-uplift stability calculation method |
| CN112926111A (en) * | 2021-01-25 | 2021-06-08 | 中国地质大学（武汉） | Suspended curtain foundation pit seepage calculation method based on improved resistance coefficient method |
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