CN105369812B - The pressure water head of foundation ditch pumping with constant rate determines method under suspension type water-stop curtain - Google Patents
The pressure water head of foundation ditch pumping with constant rate determines method under suspension type water-stop curtain Download PDFInfo
- Publication number
- CN105369812B CN105369812B CN201510657979.4A CN201510657979A CN105369812B CN 105369812 B CN105369812 B CN 105369812B CN 201510657979 A CN201510657979 A CN 201510657979A CN 105369812 B CN105369812 B CN 105369812B
- Authority
- CN
- China
- Prior art keywords
- water
- mrow
- artesian aquifer
- msub
- dewatering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Sewage (AREA)
Abstract
The pressure water head that the present invention provides foundation ditch pumping with constant rate under a kind of suspension type water-stop curtain determines method, methods described is on the basis of artesian aquifer soil layer information and information of drawing water is obtained, according to Darcy's law and mass conservation principle, for constant flow pump process in foundation ditch, the changing value of level of ground water caused by the groundwater level and water-stop curtain when water-stop curtain is introduced into water-bearing layer is determined, so that it is determined that artesian water water level inside and outside foundation ditch during pumping with constant rate in foundation ditch under suspension type water-stop curtain.The present invention combines that Darcy's law, mass conservation principle and seepage action of ground water are theoretical, when can intuitively reflect base pit dewatering inside and outside foundation ditch pressure water head distribution, so as to provide foundation to analyze influence of the base pit dewatering to surrounding enviroment.This method is simple, practical, is easy to promote, with very big application value.
Description
Technical field
The present invention relates to the construction technology in the underground engineering fields such as a kind of building, water conservancy, traffic, environment, specifically, relate to
And the pressure water head of foundation ditch pumping with constant rate determines method under a kind of suspension type water-stop curtain.
Background technology
Base pit engineering is the important component of high-rise construction and underground space engineering, and base pit dewatering is then foundation ditch
The committed step of excavation construction, the effect of base pit dewatering has great shadow to the safety of excavation of foundation pit and the sedimentation of foundation ditch surrounding ground
Ring.With the extension of city size, the rise of cost of land and the progress of construction technology, China's base pit engineering gradually shows
Deep, big trend, part foundation depth reaches 40m.The excavation of deep big foundation pit, it usually needs reduction artesian water water level.To reduce
The waterpower often completely cut off around influence of the precipitation to surrounding enviroment, foundation ditch using water-stop curtain in foundation ditch with the outer water-bearing layer of foundation ditch is joined
System, weakens the seepage flow activity of underground water.However, because artesian aquifer thickness is big, most of foundation pit waterproof curtains can not be by pressure-bearing
Water-bearing layer separates completely, thus shows a kind of underslung curtain.When being drawn water in foundation ditch, the presence of water-stop curtain causes
Seepage action of ground water area reduces, seepage direction changes, percolation path extension, underground water inside and outside foundation ditch head difference is occurred, so that
Reach the purpose of environmental protection.Influenceed by the factor such as site condition and construction, the inspection well limited amount in base pit engineering,
Foundation ditch outward appearance well logging quantity seldom even without, it is difficult to the excursion of underground water inside and outside foundation ditch is judged, it is thus determined that sealing curtain
In the lower foundation ditch of curtain effect during precipitation inside and outside foundation ditch pressure water head change, to instructing base pit engineering construction, protection foundation ditch external rings
Border and reduction surface subsidence are significant.
Found through being retrieved to prior art literature, current engineering circles often calculate the lower base of water-stop curtain effect with numerical method simulation
Cheat WATER LEVEL CHANGES caused by precipitation.Liu Guofeng be equal to 2014《Engineering investigation》On deliver《Diaphragm wall buried depth
Influence research to ultra-deep foundation pit dewatering effect》It is continuous under being analyzed differently by Three-dimension Numerical Model detailed comparisons in one text
Under wall depth cheat in precipitation when foundation ditch inside and outside Analysis of Ground-water Seepage Field distribution.But it is complex to set up numerical model, field engineering
Teacher is difficult to direct application.Wang Junhui be equal to 2009《Hydrogeological engineering geology》On deliver《Underground structure is to seepage field
Parsing-semi analytical method of barrier problem》Water level when seepage field reaches stable state under the influence of strip structures is proposed in one text
The determination method of change.The method of Wang Junhui etc. is limited only in research range without source sink term, and structures are horizontally or vertically
The situation that direction separates in water-bearing layer completely.In addition, this method is only capable of determining that underground water passes through i.e. seepage flow face during structures bottom
Product reduces the SEA LEVEL VARIATION produced, it is impossible to determine that seepage direction changes influence to water level, do not account for yet water-bearing layer it is each to
The opposite sex, it is as a result less than normal.For pumping with constant rate problem in the lower foundation ditch of water-stop curtain effect, at present still without in directly determination foundation ditch
The method of outer pressure water head, it is therefore necessary to make further research in this regard.
The content of the invention
For defect of the prior art, it is an object of the invention to provide foundation ditch constant flow under a kind of suspension type water-stop curtain
The pressure water head drawn water determines method, on the basis of artesian aquifer soil layer information and information of drawing water is obtained, fixed according to darcy
Rule and mass conservation principle, for constant flow pump process in foundation ditch, determine underground water when water-stop curtain is introduced into water-bearing layer
The changing value of level of ground water caused by water level and water-stop curtain, so that it is determined that pumping with constant rate in foundation ditch under suspension type water-stop curtain
When foundation ditch inside and outside artesian water water level.
To realize object above, the present invention provides a kind of pressure water head of foundation ditch pumping with constant rate under suspension type water-stop curtain
Method is determined, methods described is realized through the following steps：
The first step, the soil layer division for obtaining foundation ditch place and artesian aquifer infiltration coefficient and thickness, i.e.,：
The soil layer for obtaining foundation ditch place by boring extracting soil method is divided, and results of permeability tests is carried out using the soil sample of collection
To determine the infiltration coefficient of artesian aquifer, the thickness b of artesian aquifer is determined according to soil layer division information；
Second step, with reference to design of foundation pit and precipitation scheme, determine foundation pit waterproof curtain information and precipitation well information；
3rd step, determine radius of influence R when many mouthfuls of dewatering wells draw water；
4th step, determination are in the case where water-stop curtain is introduced into artesian aquifer, each list when many mouthfuls of dewatering wells draw water
Under well pumping action in water-bearing layer any point pressure water head hni(ri)；
5th step, determine that water-stop curtain during water withdrawal reduces artesian aquifer caused by the artesian aquifer cross-section of river
SEA LEVEL VARIATION Δ h1i(ri)；
6th step, determine that water-stop curtain changes any point in artesian aquifer caused by percolation path during water withdrawal
SEA LEVEL VARIATION Δ h2i(ri)；
7th step, with reference to the 4th step, the 5th step and the 6th step, determine under suspension type water-stop curtain in foundation ditch during water withdrawal
The pressure water head h of any point in artesian aquiferi(ri)；
8th step, with reference to the 7th step, determine the artesian water of artesian aquifer any point when many mouthfuls of dewatering wells draw water in foundation ditch
Position h.
Preferably, in the first step：
Described boring extracting soil method refers to：In the range of 2.5 times of design of foundation pit depth, using heavy wall soil sampler every
Individual soil layer chooses 3 soil samples；
Described results of permeability tests refers to：Using Φ 200 cutting ring 3 are respectively cut along each solum horizontal to vertical
Oblate cylinder soil sample, soil sample is put into permeameter, according to the change of water level and water in the determination time, determines artesian aquifer
Horizontal-hole blasting kxWith vertical osmotic coefficient kzTest method.
Preferably, in second step, described foundation pit waterproof curtain information refers to：Foundation pit waterproof curtain enters artesian aquifer
Depth bbAnd water-stop curtain barrier thickness ratio ε, wherein：
The bbDivided and determined according to the soil layer in design of foundation pit scheme and foundation ditch place；
The ε refers to：The ratio of the thickness of water-stop curtain and artesian aquifer thickness in artesian aquifer, ε meets formula：
Preferably, in second step, described precipitation well information refers to：The position of dewatering well and quantity, the length of filter,
The initial water level h of artesian aquifer0And the stable pump-out Q of dewatering wellw, wherein：
The initial water level h of the artesian aquifer0Refer to：Dewatering well Cheng Jinghou, lining rope is put into well, for three days on end
Measurement water level, daily measurement 3 times above, the average value of resulting water level is the initial water level of artesian aquifer；
The filter length refers to：The length of dewatering well cross-section of river in artesian aquifer；
The stable pump-out Q of the dewatering wellwRefer to：The water extracted out in the dewatering well unit interval, QwIn pump process
Keep constant, it is measured by water meter measurement.
It is highly preferred that the water meter measurement refers to：Water meter is accessed in the drainpipe near pumped well well head, startup is drawn water
Pump, treats that drainpipe starts the initial reading of water meter under water outlet postscript, and the real time readouts of water meter, the difference of two numbers are read after 24 hours
Value is the daily pump-out of the pumped well.
Preferably, in the 3rd step, it is determined that radius of influence R when many mouthfuls of described dewatering wells draw water comprises the following steps：
(1) the drawdown S of single port dewatering well when many mouthfuls of dewatering wells draw water is determinedwi, SwiMeet below equation：
Swi=h0-hwi,
Wherein：hwiThe fixed level of i-th mouthful of dewatering well when being drawn water for many mouthfuls of dewatering wells；h0For the initial water of artesian aquifer
Position；
(2) radius of influence R when many mouthfuls of dewatering wells draw water is determined, R meets below equation：
Wherein：SmaxFor each dewatering well drawdown SwiMaximum；kxFor the horizontal-hole blasting of artesian aquifer.
It is highly preferred that in step (1), the fixed level h of described i-th mouthful of dewatering wellwiRefer to：Many mouthfuls of dewatering wells draw water surely
After fixed, lining rope is put into i-th mouthful of dewatering well, the precipitation Well Water Level is read every 2~3 hours, when continuous 3 times readings
Precipitation Well Water Level error is when within 1%, and the average value for taking this water level of three times is the final fixed level of the dewatering well.
Preferably, in the 4th step, described hni(ri) meet equation below：
Wherein：QwiFor the stable pump-out of i-th mouthful of dewatering well；riFor water level point to be asked in stratum to i-th mouthful of dewatering well
Horizontal range, it is measured by steel ruler；R is radius of influence when many mouthfuls of dewatering wells draw water；kxFor the horizontal permeation of artesian aquifer
Coefficient；B is the thickness of artesian aquifer；h0For the initial water level of artesian aquifer.
Preferably, in the 5th step, it is determined that described Δ h1i(ri) comprise the following steps：
(1) the pressure water head h of any point in artesian aquifer caused by seepage area reduces during water withdrawal is determined1i
(ri), h1i(ri) meet below equation：
Wherein：QwiFor the stable pump-out of i-th mouthful of dewatering well；h0For the initial water level of artesian aquifer；ε is water-stop curtain
Barrier thickness ratio；θiOn the sectional elevation determined for water level point to be asked with i-th mouthful of dewatering well central axis, i-th mouthful of dewatering well
Central axis is to this side foundation pit waterproof curtain inward flange apart from r1iWith outward flange apart from r2iThe ratio between, θiMeet formular1iWith r2iMeasured and drawn along ground by steel ruler；R is radius of influence when many mouthfuls of dewatering wells draw water；kxIt is aqueous for pressure-bearing
The horizontal-hole blasting of layer；B is the thickness of artesian aquifer；
(2) water level of artesian aquifer caused by water-stop curtain reduction artesian aquifer cross-section of river during water withdrawal is determined
Changes delta h1i(ri), Δ h1i(ri) meet below equation：
Δh1i(ri)=hni(ri)-h1i(ri)。
Preferably, in the 6th step, described Δ h2i(ri) meet below equation：
Δh2i(ri)=m Δs h1i(ri),
M meets below equation in formula：
Wherein：B is the thickness of artesian aquifer；ε is the barrier thickness ratio of water-stop curtain；kxFor the level of artesian aquifer
Infiltration coefficient；kzFor the vertical infiltration coefficient of artesian aquifer.
Preferably, in the 7th step, described hi(ri) meet below equation：
Wherein：QwiFor the stable pump-out of i-th mouthful of dewatering well；h0For the initial water level of artesian aquifer；ε is water-stop curtain
Barrier thickness ratio；θiOn the sectional elevation determined for water level point to be asked with i-th mouthful of dewatering well central axis, i-th mouthful of dewatering well
Central axis is to this side foundation pit waterproof curtain inward flange apart from r1iWith outward flange apart from r2iThe ratio between, θiMeet formular1iWith r2iMeasured and drawn along ground by steel ruler；R is radius of influence when many mouthfuls of dewatering wells draw water；kxIt is aqueous for pressure-bearing
The horizontal-hole blasting of layer；B is the thickness of artesian aquifer.
Preferably, in the 8th step, described h meets below equation：
Wherein：N is dewatering well quantity.
Compared with prior art, the present invention has the advantages that：
The present invention combines Darcy's law, mass conservation principle and seepage action of ground water theory, and there is provided directly calculate sealing curtain
In the lower foundation ditch of curtain effect during pumping with constant rate, the formula of pressure water head, base when can intuitively reflect base pit dewatering inside and outside foundation ditch
The distribution of the inside and outside pressure water head in hole, so that the influence for analysis base pit dewatering to surrounding enviroment provides foundation.This method is simple, real
With, be easy to promote, with very big application value.
Brief description of the drawings
By reading the description with reference to the following drawings, other features, objects, and advantages of the invention will become brighter
It is aobvious.
Fig. 1 draws water schematic diagram for many wells of one embodiment of the invention；
Fig. 2 is the foundation ditch of one embodiment of the invention and the position relationship plan of dewatering well；
Fig. 3 for one embodiment of the invention two mouthfuls of dewatering wells simultaneously precipitation when foundation ditch inside and outside pressure water head distribution map.
Embodiment
With reference to specific embodiment, the present invention will be described in detail.Following examples will be helpful to the skill of this area
Art personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the common skill of this area
For art personnel, without departing from the inventive concept of the premise, several modifications and improvements still can be made.These belong to this
The protection domain of invention.
There is no what is described in detail to record progress partly referring to the content of the invention in specific embodiment presented below, embodiment.
Embodiment
Certain Circular Pit is located at the top of artesian aquifer, carries out twin-well and draws water, and the position relationship of foundation ditch and dewatering well is put down
Face is as shown in Figure 2.
As shown in Figure 1-Figure 3, the present embodiment provides a kind of artesian water of foundation ditch pumping with constant rate under suspension type water-stop curtain
Position determines method, and methods described is realized through the following steps：
Step 1: the soil layer for obtaining foundation ditch place is divided and artesian aquifer infiltration coefficient and thickness
Soil layer division information is obtained by boring extracting soil as follows：
Buried depth 0.00-1.82m scopes are miscellaneous fill, and buried depth 1.82-14.12m scopes are grey sandy silt, buried depth
14.12-20.12m scopes are grey Muddy Bottoms clay, and buried depth 20.12-24.12m scopes are grey clay, buried depth 24.12-
28.00m scopes are dark green-olive drab(O.D) silty clay, and buried depth 28.00-38.00m scopes are straw colour~grey flour sand.
The artesian aquifer obtained by boring extracting soil is straw colour~grey flour sand, and thickness is 10m；Tried by indoor infiltration
Test the horizontal-hole blasting k of the artesian aquifer of acquisitionxWith vertical osmotic coefficient kzIt is 4m/d.
Step 2: with reference to design of foundation pit and precipitation scheme, determining foundation pit enclosure structure design information, precipitation well information
In the present embodiment, foundation ditch is using diaphram wall as building enclosure, and foundation ditch radius is 18m；Diaphram wall is made
For water-stop curtain, width is 1m, and water-stop curtain enters the depth b of artesian aquiferbIt is for 9m, water-stop curtain barrier thickness ratio ε
0.9, foundation ditch is drawn water using two mouthfuls of dewatering wells, and particular location is as shown in Fig. 2 No. 1 dewatering well central axis and foundation ditch central axis
Overlap, two mouthfuls of dewatering well filter lengths are 10m, artesian aquifer initial water level h0For -1m, two mouthfuls of dewatering wells are stable to draw water
Measure QwIt is 100m3/d。
Step 3: determining radius of influence R when many mouthfuls of dewatering wells draw water
Specifically include：
(1) drawdown S when two mouthfuls of dewatering wells draw water is determinedw1And Sw2, lining rope is put into well, every 2~3
Hour read precipitation Well Water Level, when No. 1 dewatering well it is continuous 3 times reading precipitation Well Water Level be respectively -5.9m, -5.86m and -
5.82m, water level error is within 1%, and the average value for taking this water level of three times is the final fixed level h of the wellw1, i.e. hw1For-
5.86m, No. 1 dewatering well drawdown Sw1=h0-hw1, obtain Sw1=4.86m；Same method measures the water level h of No. 2 dewatering wellsw2
For -6.80, No. 2 dewatering well drawdown Sw2=h0-hw2=5.80m.
(2) radius of influence R when two mouthfuls of dewatering wells draw water is determined：
(SmaxFor each dewatering well drawdown SwiMaximum, i.e.,
Take 5.80m).
Step 4: determining in the case where water-stop curtain is introduced into artesian aquifer, each list when many mouthfuls of dewatering wells draw water
Under well pumping action in water-bearing layer any point pressure water head hni(ri)
The hni(ri) meet equation below：
So that it is determined that the pressure water head h of No. 1 dewatering well and No. 2 dewatering wells at any pointn1(r1) and hn2(r2), calculate public
Formula is respectively：
Step 5: determining that water-stop curtain reduces artesian aquifer caused by the artesian aquifer cross-section of river during water withdrawal
SEA LEVEL VARIATION Δ h1i(ri)
Comprise the following steps：
(1) the pressure water head h of any point in artesian aquifer when No. 1 dewatering well and No. 2 dewatering wells draw water is calculated11(r1) and
h12(r2), by formula：
Obtain the Δ h of No. 1 well of the present embodiment and No. 2 wells11(r1) and Δ h12(r2)：
(2) determine that water-stop curtain reduces caused by the artesian aquifer cross-section of river when No. 1 dewatering well and No. 2 dewatering wells draw water
SEA LEVEL VARIATION Δ h11(r1) and Δ h12(r2), by formula：
Δh1i(ri)=hni(ri)-h1i(ri)
Obtain the Δ h of No. 1 dewatering well of the present embodiment and No. 2 dewatering wells11(r1) and Δ h12(r2)：
Step 6: determining that water-stop curtain changes any point in artesian aquifer caused by percolation path during water withdrawal
SEA LEVEL VARIATION Δ h2i(ri)
The Δ h2i(ri) meet below equation：Δh2i(ri)=m Δs h1i(ri),
M meets below equation：
In the present embodiment, because obstructing than ε=0.9>0.25,
Water-stop curtain changes in artesian aquifer caused by percolation path in No. 1 dewatering well and No. 2 dewatering well pump process
The SEA LEVEL VARIATION Δ h of any point21(r1) and Δ h22(r2) be respectively：
Δh21(r1The Δ h of)=2.6811(r1)；
Δh22(r2The Δ h of)=2.6812(r2)。
Step 7: determining under suspension type water-stop curtain in foundation ditch the artesian water of any point in artesian aquifer during water withdrawal
Position hi(ri)
Described hi(ri) meet below equation：
When No. 1 dewatering well and No. 2 dewatering wells draw water in foundation ditch under the present embodiment suspension type water-stop curtain in artesian aquifer
The pressure water head h of any point1(r1) and h2(r2) be respectively：
Step 8: determining the pressure water head h of artesian aquifer any point when many mouthfuls of dewatering wells draw water in foundation ditch
The h meets below equation：
Obtain the pressure water head h of artesian aquifer any point when No. 1 dewatering well and No. 2 dewatering wells draw water in foundation ditch：
Calculate each point pressure water head in Fig. 2 on I-I sections and water level distribution map is made, as a result as shown in figure 3, in Fig. 3
Abscissa is horizontal range of each point to No. 1 well central axis.
The pressure water head of foundation ditch pumping with constant rate determines that method can be quick and precisely under suspension type water-stop curtain in the present invention
Ground calculates the pressure water head in stratum when multiple dewatering wells draw water in foundation ditch, to instructing Practical Project significant.This
Method is simple, practical, is easy to promote, with very big application value.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (5)
1. the pressure water head of foundation ditch pumping with constant rate determines method under a kind of suspension type water-stop curtain, it is characterised in that the side
Method is realized through the following steps：
The first step, the soil layer division information and artesian aquifer infiltration coefficient and thickness for obtaining foundation ditch place, i.e.,：
The soil layer division information in foundation ditch place is obtained by boring extracting soil method, results of permeability tests is carried out using the soil sample of collection
To determine the infiltration coefficient of artesian aquifer, the thickness b of artesian aquifer is determined according to soil layer division information；
Second step, with reference to design of foundation pit and precipitation scheme, determine foundation pit waterproof curtain information and precipitation well information；
3rd step, determine radius of influence R when many mouthfuls of dewatering wells draw water；
4th step, determination are in the case where water-stop curtain is introduced into artesian aquifer, and each individual well is taken out when many mouthfuls of dewatering wells draw water
The pressure water head h of any point in the lower water-bearing layer of water effectni(ri), riFor water of the water level point to be asked to i-th mouthful of dewatering well in stratum
Flat distance；Described hni(ri) meet equation below：
<mrow>
<msub>
<mi>h</mi>
<mrow>
<mi>n</mi>
<mi>i</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>r</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>Q</mi>
<mrow>
<mi>w</mi>
<mi>i</mi>
</mrow>
</msub>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>r</mi>
<mi>i</mi>
</msub>
<mo>/</mo>
<mi>R</mi>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mn>2</mn>
<msub>
<mi>&pi;k</mi>
<mi>x</mi>
</msub>
<mi>b</mi>
</mrow>
</mfrac>
<mo>+</mo>
<msub>
<mi>h</mi>
<mn>0</mn>
</msub>
<mo>,</mo>
</mrow>
Wherein：QwiFor the stable pump-out of i-th mouthful of dewatering well；riFor level of the water level point to be asked to i-th mouthful of dewatering well in stratum
Distance, it is measured by steel ruler；R is radius of influence when many mouthfuls of dewatering wells draw water；kxFor the horizontal-hole blasting of artesian aquifer；
B is the thickness of artesian aquifer；h0For the initial water level of artesian aquifer；
5th step, the water level for determining artesian aquifer caused by water-stop curtain reduction artesian aquifer cross-section of river during water withdrawal
Changes delta h1i(ri)；
It is determined that described Δ h1i(ri) comprise the following steps：
(1) the pressure water head h of any point in artesian aquifer caused by seepage area reduces during water withdrawal is determined1i(ri), h1i
(ri) meet below equation：
Wherein：h0For the initial water level of artesian aquifer；θiFor erecting that water level point to be asked and i-th mouthful of dewatering well central axis are determined
On straight section, i-th mouthful of dewatering well central axis is to this side foundation pit waterproof curtain inward flange apart from r1iWith outward flange apart from r2i
The ratio between, θiMeet formular1iWith r2iMeasured and drawn along ground by steel ruler；riIt is water level point to be asked in stratum to i-th mouthful
The horizontal range of dewatering well；QwiFor the stable pump-out of i-th mouthful of dewatering well；kxFor the horizontal-hole blasting of artesian aquifer；ε is
The barrier thickness ratio of water-stop curtain, the ε refers to：The ratio of the thickness of water-stop curtain and artesian aquifer thickness in artesian aquifer
Value, ε meets formula：bbEnter the depth of artesian aquifer for foundation pit waterproof curtain；
(2) SEA LEVEL VARIATION of artesian aquifer caused by water-stop curtain reduction artesian aquifer cross-section of river during water withdrawal is determined
Δh1i(ri), Δ h1i(ri) meet below equation：
Δh1i(ri)=hni(ri)-h1i(ri)；
6th step, determine that water-stop curtain during water withdrawal changes the water of any point in artesian aquifer caused by percolation path
Position changes delta h2i(ri)；
Described Δ h2i(ri) meet below equation：
Δh2i(ri)=m Δs h1i(ri),
M meets below equation in formula：
<mrow>
<mi>m</mi>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mn>1.32</mn>
<mi>b</mi>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>&epsiv;</mi>
<mo>)</mo>
</mrow>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>k</mi>
<mi>x</mi>
</msub>
<msub>
<mi>k</mi>
<mi>z</mi>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mfrac>
<mn>5</mn>
<mn>8</mn>
</mfrac>
</msup>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mn>10</mn>
<mi>b</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mrow>
<mn>0.3668</mn>
<mi>ln</mi>
<mi>b</mi>
<mo>-</mo>
<mn>0.852</mn>
</mrow>
</msup>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>&epsiv;</mi>
<mo><</mo>
<mn>0.25</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msqrt>
<mfrac>
<mn>1</mn>
<mn>8</mn>
</mfrac>
</msqrt>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mn>6</mn>
<msup>
<mi>&epsiv;</mi>
<mn>1.1</mn>
</msup>
</mrow>
<msup>
<mrow>
<mo>(</mo>
<mrow>
<mn>1</mn>
<mo>-</mo>
<mi>&epsiv;</mi>
</mrow>
<mo>)</mo>
</mrow>
<mn>2.23</mn>
</msup>
</mfrac>
<mo>)</mo>
</mrow>
<mfrac>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>&epsiv;</mi>
<mo>)</mo>
<mi>b</mi>
</mrow>
<mi>&epsiv;</mi>
</mfrac>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>k</mi>
<mi>x</mi>
</msub>
<msub>
<mi>k</mi>
<mi>z</mi>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mfrac>
<mn>5</mn>
<mn>8</mn>
</mfrac>
</msup>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mn>10</mn>
<mi>b</mi>
</mfrac>
<mo>)</mo>
</mrow>
<mrow>
<mn>0.3668</mn>
<mi>ln</mi>
<mi>b</mi>
<mo>-</mo>
<mn>0.852</mn>
</mrow>
</msup>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>&epsiv;</mi>
<mo>&GreaterEqual;</mo>
<mn>0.25</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
Wherein：B is the thickness of artesian aquifer；kxFor the horizontal-hole blasting of artesian aquifer；kzFor the vertical of artesian aquifer
Infiltration coefficient；
7th step, the h obtained using the 4th stepni(ri), the obtained Δ h of the 5th step1i(ri), the obtained Δ h of the 6th step2i(ri),
Determine under suspension type water-stop curtain in foundation ditch the pressure water head h of any point in artesian aquifer during water withdrawali(ri)；
Described hi(ri) meet below equation：
Wherein：QwiFor the stable pump-out of i-th mouthful of dewatering well；θiDetermined for water level point to be asked with i-th mouthful of dewatering well central axis
Sectional elevation on, i-th mouthful of dewatering well central axis is to this side foundation pit waterproof curtain inward flange apart from r1iWith outward flange away from
From r2iThe ratio between, θiMeet formulariFor horizontal range of the water level point to be asked to i-th mouthful of dewatering well in stratum；h0For pressure-bearing
The initial water level in water-bearing layer；kxFor the horizontal-hole blasting of artesian aquifer；
8th step, the h obtained using the 7th stepi(ri), determine artesian aquifer any point when many mouthfuls of dewatering wells draw water in foundation ditch
Pressure water head h；
Described h meets below equation：
<mrow>
<mi>h</mi>
<mo>=</mo>
<munderover>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<msub>
<mi>h</mi>
<mi>i</mi>
</msub>
<mrow>
<mo>(</mo>
<msub>
<mi>r</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<msub>
<mi>h</mi>
<mn>0</mn>
</msub>
<mo>,</mo>
</mrow>
Wherein：N is dewatering well quantity, h0For the initial water level of artesian aquifer.
2. the pressure water head determination side of foundation ditch pumping with constant rate under a kind of suspension type water-stop curtain according to claim 1
Method, it is characterised in that in the first step：
Described boring extracting soil method refers to：In the range of 2.5 times of design of foundation pit depth, using heavy wall soil sampler in each soil
Layer choosing takes 3 soil samples；
Described results of permeability tests refers to：Using Φ 200 cutting ring along each solum horizontal to it is vertical respectively cut 3 it is oblate
Cylinder soil sample, soil sample is put into permeameter, according to the change of water level and water in the determination time, determines the water of artesian aquifer
Flat osmotic coefficient kxWith vertical osmotic coefficient kzTest method.
3. the pressure water head determination side of foundation ditch pumping with constant rate under a kind of suspension type water-stop curtain according to claim 1
Method, it is characterised in that in second step, described foundation pit waterproof curtain information refers to：Foundation pit waterproof curtain enters artesian aquifer
Depth bbAnd water-stop curtain barrier thickness ratio ε, wherein：
The bbDivided and determined according to the soil layer in design of foundation pit scheme and foundation ditch place；
The ε refers to：The ratio of the thickness of water-stop curtain and artesian aquifer thickness in artesian aquifer, ε meets formula：
4. the pressure water head determination side of foundation ditch pumping with constant rate under a kind of suspension type water-stop curtain according to claim 1
Method, it is characterised in that in second step, described precipitation well information refers to：The position of dewatering well and quantity, the length of filter,
The initial water level h of artesian aquifer0And the stable pump-out Q of dewatering wellw, wherein：
The initial water level h of the artesian aquifer0Refer to：Dewatering well Cheng Jinghou, lining rope is put into well, is surveyed above for three days on end
Water level is measured, daily measurement 3 times, the average value of resulting water level is the initial water level of artesian aquifer；
The filter length refers to：The length of dewatering well cross-section of river in artesian aquifer；
The stable pump-out Q of the dewatering wellwRefer to：The water extracted out in the dewatering well unit interval, QwKept in pump process
Constant, it is measured by water meter measurement；The water meter measurement refers to：Water meter is accessed in the drainpipe near dewatering well well head, opened
Dynamic suction pump, treats that drainpipe starts the initial reading of water meter under water outlet postscript, and the real time readouts of water meter, two are read after 24 hours
Several differences is the daily pump-out of the dewatering well.
5. the pressure water head determination side of foundation ditch pumping with constant rate under a kind of suspension type water-stop curtain according to claim 1
Method, it is characterised in that in the 3rd step, it is determined that radius of influence R when many mouthfuls of described dewatering wells draw water, comprises the following steps：
(1) the drawdown S of single port dewatering well when many mouthfuls of dewatering wells draw water is determinedwi, SwiMeet below equation：
Swi=h0-hwi,
Wherein：h0For the initial water level of artesian aquifer；hwiThe fixed level of i-th mouthful of dewatering well when being drawn water for many mouthfuls of dewatering wells,
hwiRefer to：Many mouthfuls of dewatering wells are drawn water after stabilization, and lining rope is put into i-th mouthful of dewatering well, the drop is read every 2~3 hours
Well water level, when the precipitation Well Water Level error of continuous 3 times readings is when within 1%, the average value for taking this water level of three times is
The final fixed level of the dewatering well；
(2) radius of influence R when many mouthfuls of dewatering wells draw water is determined, R meets below equation：
<mrow>
<mi>R</mi>
<mo>=</mo>
<mn>10</mn>
<msub>
<mi>S</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
<msqrt>
<msub>
<mi>k</mi>
<mi>x</mi>
</msub>
</msqrt>
<mo>,</mo>
</mrow>
Wherein：SmaxFor each dewatering well drawdown SwiMaximum；kxFor the horizontal-hole blasting of artesian aquifer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657979.4A CN105369812B (en) | 2015-10-13 | 2015-10-13 | The pressure water head of foundation ditch pumping with constant rate determines method under suspension type water-stop curtain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657979.4A CN105369812B (en) | 2015-10-13 | 2015-10-13 | The pressure water head of foundation ditch pumping with constant rate determines method under suspension type water-stop curtain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105369812A CN105369812A (en) | 2016-03-02 |
| CN105369812B true CN105369812B (en) | 2017-09-08 |
Family
ID=55372397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510657979.4A Expired - Fee Related CN105369812B (en) | 2015-10-13 | 2015-10-13 | The pressure water head of foundation ditch pumping with constant rate determines method under suspension type water-stop curtain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105369812B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108532617B8 (en) * | 2018-04-17 | 2019-10-08 | 广州地铁设计研究院股份有限公司 | Heterogeneous water table aquifer suspended cutoff foundation pit determines water level and draws water method for determination of amount |
| CN108549774B (en) * | 2018-04-17 | 2021-10-26 | 中南大学 | Method for determining fixed water level water pumping quantity of suspension type curtain foundation pit with heterogeneous confined water layer |
| CN109724908A (en) * | 2018-08-17 | 2019-05-07 | 北京工业大学 | A kind of suspension type water-stop curtain flow model in porous media pilot system |
| 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 |
| CN110565978B (en) * | 2019-09-11 | 2023-08-15 | 上海建工一建集团有限公司 | Control method and structure of confined water in existing basement storey-adding construction |
| CN112411634A (en) * | 2020-10-23 | 2021-02-26 | 中信国安建工集团有限公司 | Intelligent construction site construction security system and security method |
| CN116341280B (en) * | 2023-05-11 | 2023-08-18 | 中国地质大学（北京） | Method for determining layered permeability coefficient of multiple water-bearing layers with unstable water-resisting layers |
-
2015
- 2015-10-13 CN CN201510657979.4A patent/CN105369812B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105369812A (en) | 2016-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105369812B (en) | The pressure water head of foundation ditch pumping with constant rate determines method under suspension type water-stop curtain | |
| Wang et al. | Field experiment and numerical simulation of coupling non-Darcy flow caused by curtain and pumping well in foundation pit dewatering | |
| CN106337426B (en) | It is a kind of to increase the anti-prominent precipitation method for gushing stability of artesian water stratum foundation pit | |
| CN105239611B (en) | Determine the method that water stopping curtain seepage influences on surrounding enviroment below excavation of foundation pit face | |
| CN107587516B (en) | A kind of efficient sealing resistance sand precipitation composite system of Follow-up type and its construction method | |
| CN103306236B (en) | Method for constructing underground reservoir in ancient gully of ancient underground river channel | |
| CN109736338A (en) | A kind of hydraulic engineering foundation pit pipe well combination light well point Yield rainfall relation method | |
| CN110031369A (en) | The underwater slurry shield mud film of bad ground forms simulator and analogy method | |
| CN106437692B (en) | Deep karst leakage channel detection structure and method based on water level of inner pipe of drill rod | |
| CN106192971A (en) | A kind of artesian water water-level observation well construction and the method for multilamellar water-level observation | |
| CN105297752B (en) | Method for determining water pumping quantity of dewatering well when fixed-water-level water pumping is carried out under action of water-proof curtain | |
| CN108241772A (en) | Consider Tunnel Gushing method for determination of amount in the crack artesian aquifer of multiple factors | |
| CN108343470B (en) | A kind of nature moisturizing method of underground water seal cave depot water curtain system | |
| CN109916447A (en) | A kind of set composite and its method for monitoring side slope saturation and sliding deformation | |
| CN104318843B (en) | Artesian well water injection test device | |
| CN105297739B (en) | The determination method of pressure water head when the default water level of foundation ditch draws water under water-stop curtain | |
| CN209432184U (en) | A kind of set composite for monitoring side slope saturation and sliding deformation | |
| CN105297753B (en) | A kind of determination method of the hydrogeological parameter under water-stop curtain effect | |
| CN103345867B (en) | Artesian well water-pumping dynamic experiment instrument | |
| CN105386430B (en) | A kind of lower water-stop curtain both sides water level method for determining difference of water-stop curtain effect | |
| CN101858074A (en) | Construction method and device for on-site water injection test | |
| CN102435540A (en) | Measurement system and method for permeability coefficient of shallow-layer sand soil | |
| CN107290260A (en) | The husky groove experimental rig of water circulation for artesian water flow model in porous media | |
| CN110161210A (en) | A kind of draw water Returning test device and its test method for simulating leakage-releasing water | |
| CN109868833A (en) | The control method of binary structural stratum deep foundation pit precipitation amount |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170908 Termination date: 20211013 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |