CN104131574A - Step water lowering method of phreatic water fully-penetrating well inclined shaft - Google Patents
Step water lowering method of phreatic water fully-penetrating well inclined shaft Download PDFInfo
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- CN104131574A CN104131574A CN201410328601.5A CN201410328601A CN104131574A CN 104131574 A CN104131574 A CN 104131574A CN 201410328601 A CN201410328601 A CN 201410328601A CN 104131574 A CN104131574 A CN 104131574A
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Abstract
The invention discloses a step water lowering method of a phreatic water fully-penetrating well inclined shaft of an inclined shaft penetrating water-rich thick sand layer section. According to the method, the concept of water lowering units is introduced. Influence of interference between the water lowering units is considered. Inclined shaft water lowering wells are computed according to computing units successively. According to the character that water lowering depths are different at different well points during an inclined shaft building process, water lowering amounts needed by the water lower units are computed with the Darcy law and the Dupuit formula. By computing construction water lowering of a Xuemiaotan mine number two auxiliary inclined shaft, a computing result meets the construction requirement. The guiding significance in safe construction of the inclined shaft in a water-rich thick sand layer is achieved. The engineering geology conditions and the hydrogeological conditions of the Shaanxi North Yuandatan well field and the Dahaize well field and those of the Xuemiaotan mine are extremely similar, accordingly, the method can be used in building of inclined shafts of the Yuandatan well field and the Dahaize well field, powerful technical support and reference are provided for inclined shaft construction in the areas, application prospect is good, inclined shaft construction speed is increased, cost is saved, and the method is widely used for inclined shaft construction.
Description
Technical field
The present invention relates to the precipitation method in coal mine inclined shaft pit shaft process of construction.Be applicable to gentle slope inclined shaft well and build the amount of precipitation estimation in process, instruct precipitation scheme design, be specially adapted to the ladder precipitation method that inclined shaft passes through a kind of complete penetration of well inclined shaft of diving under water of rich water thick sand bed section.
Background technology
Whether existing dewatering well reaches impervious layer according to its shaft bottom is divided into complete penetration of well and partially penetrating well; According to underground water, have or not pressure, dewatering well is divided into artesian well and phreatic well (without kill-job).Corresponding precipitation theory comprises pressure-bearing whole well precipitation theory, pressure-bearing partially penetrating well precipitation theory, diving complete penetration of well precipitation theory, diving partially penetrating well precipitation theory etc.The each point drawdown that above-mentioned precipitation theory is calculated is identical, but for guaranteeing that inclined shaft excavates smoothly, requirement digging process middle water level all, below inclined shaft base plate, causes being linear change along each point drawdown in inclined shaft length range, and existing precipitation theory is no longer applicable to inclined shaft well and builds precipitation calculating.
Summary of the invention
The object of this invention is to provide a kind of amount of precipitation can not calculate scientifically and rationally inclined shaft and build for existing precipitation theory time, introduce precipitation unit concept, according to the different feature of the different well-points dewatering degree of depth in inclined shaft process of construction, calculate the ladder precipitation method of a kind of complete penetration of well inclined shaft of diving under water of each required amount of precipitation in precipitation unit.
In order to overcome prior art deficiency, technical scheme of the present invention is to solve like this: a kind of ladder precipitation method of the complete penetration of well inclined shaft of diving under water, and the method is carried out in the steps below:
(1), for guaranteeing that inclined shaft excavates smoothly, require digging process middle water level all below inclined shaft base plate, on the earth's surface of inclined shaft, apart from inclined shaft main hole periphery, be drilled with respectively the first pit shaft, the second pit shaft, the 3rd pit shaft, the 4th pit shaft and the 5th pit shaft;
(2), above-mentioned five pit shafts are drawn water, pit shaft around original water surface just becomes the crooked water surface by level, and finally this curve becomes stable gradually, formation cone of depression;
(3), 3 mouthfuls of pit shafts in five pit shafts are divided into group wells computing unit, this computing unit is triangularly arranged, and wherein the first pit shaft, the second pit shaft, the 3rd pit shaft and the 3rd pit shaft, the 4th pit shaft and the 5th pit shaft are respectively A computing unit and C computing unit; Described the first pit shaft, the 3rd pit shaft and the 4th pit shaft are region B, and described region B is the coverage area of A computing unit and C computing unit, and wherein A point, B point and C point are respectively the centre of form of delta-shaped region;
(4), utilize Darcy's law and Qiu cotton clothes' formula to calculate precipitation scope and amount of precipitation;
(5), in order to simplify calculating, a large well is used as in the group wells unit of triangular arrangement, flow calculates according to Qiu cotton clothes' formula, now, S is for disturbing the drawdown value at group wells center, the equivalent radius of circle r that well radius is large well
0;
Water yield design formulas is
Wherein, H-water table aquifer thickness, m;
S-great Jing center drawdown, m;
R
0-large well computing unit equivalent redius, m;
R-large well radius of influence, m;
According to formula (1), the drawdown S of r place, Ke Youjujing center
1determine computing unit total yield Q, by computing unit total yield Q inverse, can determine well center drawdown S;
Described inclined shaft dewatering well is successively started working by computing unit, and circular is as follows:
1), utilizing Qiu cotton clothes' formula to calculate i organizes unit A, now should guarantee that B point groundwater table is below base plate, the drawdown S that B is ordered
irand the distance of AB is brought formula (1) into, the total yield Q of computing unit A
i;
2), with the total yield Q of computing unit A
iinverse A point drawdown S
i, and guarantee that A point water level is at A point below base plate;
3), utilize Qiu cotton clothes' formula to calculate i+1 group unit C, the calculating water level that now C order is that i group A unit affects water level, repetition 1 while drawing water) and 2) step is extended forward, until inclined shaft enters basement rock.
Between described precipitation unit, due to the impact being disturbed, respectively precipitation unit is carried out to precipitation calculating.
Described inclined shaft dewatering well successively carries out ladder precipitation water yield by computing unit and drawdown is calculated.
Compared with prior art, to the calculating of No. two subincline shaft construction precipitation of Xue Miao beach mine, result of calculation meets construction requirement in the present invention.This has important practical guided significance to guaranteeing the safe construction of inclined shaft in rich water thick sand bed.
Place, field with "nine squares" engineering geological conditions is extremely similar to Xue Miao beach mine with hydrogeological conditions with sea for Yuan great Tan field with "nine squares", northern Shensi, therefore the present invention by first for Yuan great Tan field with "nine squares" and sea the inclined shaft construction in field with "nine squares" go, simultaneously, Ye Huiwei of the present invention this area slope construction provides strong technical guarantee and reference, application prospect is long-range, accelerate slope construction speed, saved expense, be widely used in slope construction.
Accompanying drawing explanation
Fig. 1 is the large well plan structure of diving complete penetration of well schematic diagram;
Fig. 2 is that the master of Fig. 1 looks precipitation cell layout structural representation;
Fig. 3 be Fig. 1 overlook precipitation cell layout structural representation;
Fig. 4 is the large well method of diving complete penetration of well inclined shaft ladder precipitation calculation diagram.
In Fig. 4, I is inclined shaft, and II is i group water level, and III is i+1 group water level.
In Fig. 3,1 to 5 is dewatering well, and 6 is inclined shaft, and A to C is precipitation unit.
In Fig. 2, I is the large well of precipitation, and II is former water level.
Table 1 is the large well method of diving complete penetration of well inclined shaft ladder precipitation result of calculation
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described:
The dive under water ladder precipitation method of complete penetration of well inclined shaft, the method is carried out in the steps below:
(1), for guaranteeing that inclined shaft excavates smoothly, require digging process middle water level all below inclined shaft base plate, on the earth's surface of inclined shaft, apart from inclined shaft main hole periphery, be drilled with respectively the first pit shaft 1, the second pit shaft 2, the 3rd pit shaft 3, the 4th pit shaft 4 and the 5th pit shaft 5;
(2), above-mentioned five pit shafts are drawn water, pit shaft around original water surface just becomes the crooked water surface by level, and finally this curve becomes stable gradually, formation cone of depression;
(3), 3 mouthfuls of pit shafts in five pit shafts are divided into group wells computing unit, this computing unit is triangularly arranged, and wherein the first pit shaft 1, the second pit shaft 2, the 3rd pit shaft 3 and the 3rd pit shaft 3, the 4th pit shaft 4 and the 5th pit shaft 5 are respectively A computing unit and C computing unit; Described the first pit shaft 1, the 3rd pit shaft 3 and the 4th pit shaft 4 are region B, and described region B is the coverage area of A computing unit and C computing unit, and wherein A point, B point and C point are respectively the centre of form of delta-shaped region;
(4), utilize Darcy's law and Qiu cotton clothes' formula to calculate precipitation scope and amount of precipitation;
(5), in order to simplify calculating, a large well is used as in the group wells unit of triangular arrangement, flow calculates according to Qiu cotton clothes' formula, now, S is for disturbing the drawdown value at group wells center, the equivalent radius of circle r that well radius is large well
0;
Water yield design formulas is
Wherein, H-water table aquifer thickness, m;
S-great Jing center drawdown, m;
R
0-large well computing unit equivalent redius, m;
R-large well radius of influence, m;
According to formula (1), the drawdown S of r place, Ke Youjujing center
1determine computing unit total yield Q, by computing unit total yield Q inverse, can determine well center drawdown S;
Described inclined shaft dewatering well is successively started working by computing unit, and circular is as follows:
1), utilizing Qiu cotton clothes' formula to calculate i organizes unit A, now should guarantee that B point groundwater table is below base plate, the drawdown S that B is ordered
irand the distance of AB is brought formula (1) into, the total yield Q of computing unit A
i;
2), with the total yield Q of computing unit A
iinverse A point drawdown S
i, and guarantee that A point water level is at A point below base plate;
3), utilize Qiu cotton clothes' formula to calculate i+1 group unit C, the calculating water level that now C order is that i group A unit affects water level, repetition 1 while drawing water) and 2) step is extended forward, until inclined shaft enters basement rock.
Between described precipitation unit, due to the impact being disturbed, respectively precipitation unit is carried out to precipitation calculating.
Described inclined shaft dewatering well successively carries out ladder precipitation water yield by computing unit and drawdown is calculated.
Embodiment 1
The present invention realizes the theory of No. two subincline shaft construction precipitation of Xue Miao beach mine is calculated, this calculation assumption inclined shaft precipitation region water barrier degree of depth 65.0m, underground water static level is at below ground 6.0m, phreatic aquifer thickness 59.0m, Quaternary system mid Pleistocene series is from stone group loose sand osmotic coefficient k=0.67m/d; Inclined shaft is with 5.5 °, inclination angle to downward-extension, and inclined shaft will start to enter groundwater table apart from well head 62m place as calculated, consider that precipitation unit will form a precipitation funnel, have certain influence radius, and therefore, first group of precipitation unit centre of form is apart from slope mouth 85m.Group wells computing unit is triangularly arranged, and leg-of-mutton height is taken as 20m (consider well wide and range of grouting), bottom side length 30m, computing unit area A=300m
2, equivalent redius
(1) first group of precipitation unit position of form center is positioned at well head to 85 meters of roadway floor centers of shaft bottom direction.Bottom plate depth 8.147m now.Require water level to be positioned at the following 0.5m of base plate place, therefore drawdown S1=2.647m.
The radius of influence
First group of precipitation unit and second group of precipitation unit centre of form distance are got 30m.Central point drawdown is S
1r=4.091m.
First group of precipitation unit water yield when precipitation reaches this drawdown
Individual well water yield is 310.452m
3/ d
First group of drawdown S of precipitation cell row heart place
1'=5.844m
The moisture layer thickness H in centre of form place, second group of precipitation unit now
2=57.631m
When (2) second groups of precipitation unit calculate, aquifer thickness is 57.631m
Second group of precipitation unit position of form center bottom plate depth 11.034m.Require water level to be positioned at the following 0.5m of base plate place, therefore drawdown S
2=4.165m.
The radius of influence
Second group of precipitation unit and the 3rd group of precipitation unit centre of form are apart from 30m.Central point drawdown is S
2r=5.609m.
Second group of precipitation unit water yield now
Individual well water yield is 306.095m
3/ d
Second group of drawdown S' of precipitation cell row heart place
2=7.436m
The moisture layer thickness H in centre of form place, the 3rd group of precipitation unit now
3=54.848m
……
Calculate one by one thus, result of calculation is in Table 1.
By analysis, according to the large well method of the complete penetration of well of diving under water the herein inclined shaft ladder precipitation theory of computation, result of calculation can meet construction requirement, is successfully completed precipitation operation, obtains obvious economic benefit.
Table 1
Claims (3)
1. the dive under water ladder precipitation method of complete penetration of well inclined shaft, the method is carried out in the steps below:
(1), for guaranteeing that inclined shaft excavates smoothly, requirement digging process middle water level all, below inclined shaft base plate, is drilled with respectively the first pit shaft (1), the second pit shaft (2), the 3rd pit shaft (3), the 4th pit shaft (4) and the 5th pit shaft (5) on the earth's surface of inclined shaft apart from inclined shaft main hole periphery;
(2), above-mentioned five pit shafts are drawn water, pit shaft around original water surface just becomes the crooked water surface by level, and finally this curve becomes stable gradually, formation cone of depression;
(3), 3 mouthfuls of pit shafts in five pit shafts are divided into group wells computing unit, this computing unit is triangularly arranged, and wherein the first pit shaft (1), the second pit shaft (2), the 3rd pit shaft (3) and the 3rd pit shaft (3), the 4th pit shaft (4) and the 5th pit shaft (5) are respectively A computing unit and C computing unit; Described the first pit shaft (1), the 3rd pit shaft (3) and the 4th pit shaft (4) are region B, and described region B is the coverage area of A computing unit and C computing unit, and wherein A point, B point and C point are respectively the centre of form of delta-shaped region;
(4), utilize Darcy's law and Qiu cotton clothes' formula to calculate precipitation scope and amount of precipitation;
(5), in order to simplify calculating, a large well is used as in the group wells unit of triangular arrangement, flow calculates according to Qiu cotton clothes' formula, now,
for disturbing the drawdown value at group wells center, the equivalent radius of circle that well radius is large well
;
Water yield design formulas is:
Wherein,
-water table aquifer thickness, m;
the drawdown of-great Jing center, m;
-large well computing unit equivalent redius, m;
-large well the radius of influence, m;
According to formula (1), Ke Youjujing center
place's drawdown
determine computing unit total yield
, by computing unit total yield
inverse can be determined well center drawdown
;
Described inclined shaft dewatering well is successively started working by computing unit, and circular is as follows:
1), utilizing Qiu cotton clothes' formula to calculate i organizes unit A, now should guarantee that B point groundwater table is below base plate, the drawdown that B is ordered
and the distance of AB is brought formula (1), the total yield of computing unit A into
;
2), with the total yield of computing unit A
inverse A point drawdown
, and guarantee that A point water level is at A point below base plate;
3), utilize Qiu cotton clothes' formula to calculate i+1 group unit C, the calculating water level that now C order is that i group A unit affects water level, repetition 1 while drawing water) and 2) step is extended forward, until inclined shaft enters basement rock.
2. the ladder precipitation method of a kind of complete penetration of well inclined shaft of diving under water according to claim 1, is characterized in that between described precipitation unit, due to the impact being disturbed, respectively precipitation unit being carried out to precipitation calculating.
3. the ladder precipitation method of a kind of complete penetration of well inclined shaft of diving under water according to claim 1, is characterized in that described inclined shaft dewatering well successively carries out ladder precipitation water yield by computing unit and drawdown is calculated.
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Cited By (2)
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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 |
CN112081095A (en) * | 2020-09-18 | 2020-12-15 | 中国水利水电科学研究院 | Drainage well layout calculation method for improving soil secondary salinization |
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CN102778260A (en) * | 2012-05-17 | 2012-11-14 | 中南大学 | Calculation method for water drainage and water drainage time in dynamic precipitation process of submersible fully penetrating well or well group |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
CN112081095A (en) * | 2020-09-18 | 2020-12-15 | 中国水利水电科学研究院 | Drainage well layout calculation method for improving soil secondary salinization |
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Application publication date: 20141105 |