CN105297753B - A kind of determination method of the hydrogeological parameter under water-stop curtain effect - Google Patents
A kind of determination method of the hydrogeological parameter under water-stop curtain effect Download PDFInfo
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Abstract
The invention provides a kind of determination method of the hydrogeological parameter under water-stop curtain effect, methods described is the pumped well pump-out during experiment is determined on the basis of obtaining soil layer information and hydrogeological information, inspection well drawdown and correspondence time during with the record experiment of semilog coordinate system, different periods are divided according to the drawdown time graph feature of record, fitting a straight line is carried out to the second period later data and the 3rd period data respectively, slope over 10 when recording the second period intercept and the 3rd, so that it is determined that the hydrogeological parameter in water-bearing layer.The method of the invention provides foundation for base pit dewatering design, and the protection of safety and environment for engineering provides effective guarantee；The inventive method is simple, practical, is easy to promote, with very big application value.
Description
Technical field
The present invention relates to a kind of method of construction engineering technical field, in particular it relates to a kind of under water-stop curtain effect
The determination method of hydrogeological parameter.
Background technology
As China's economy is developed rapidly, urbanization requirement is unprecedented surging, and reasonable development and the application of the underground space seem
It is exceptionally important.Substantial amounts of deep-foundation pit engineering is continued to bring out in recent years, while influence of the underground water to deep pit monitor is very big, especially
It is artesian water, is one of the key factor of deep pit monitor construction.The backwater effect of artesian aquifer piezometric head may to hole bottom
Cause prominent emerge in large numbers as, it is necessary to artesian water water level be reduced, so as to ensure the safety of foundation ditch.It is big that water-stop curtain joint is widely used at present
The mode of bore well reduces groundwater level in foundation ditch.Rational base pit dewatering design, which needs to set up, is understanding the water-bearing layer hydrology
On the basis of geologic parameter.For artesian aquifer, typically water-bearing layer is determined by the way of live bailing test
Hydrogeological parameter.But in many engineerings, bailing test is usually carried out in the presence of water-stop curtain, and foundation ditch stops
The presence of water curtain changes seepage action of ground water environment so that water-bearing layer thickness there occurs discontinuous, interim change, this
Just the calculating to hydrogeological parameter causes difficulty.
Found through being retrieved to prior art literature, the method that existing utilization analytic solution determines hydrogeological parameter, such as
Theis methods, Cooper and Jacob methods, Hantush-Jacob methods, are only applicable in unbounded artesian aquifer, it is impossible to apply
In the discontinuous situation of water-bearing layer thickness.Zhang Nan in 2011《The underground space and engineering journal》In deliver《Deep basal pit water
The determination of literary geologic parameter and dewatering design》Reluctantly using Hantush-Jacob methods to Shanghai Hongkou store foundation ditch work in one text
Journey bailing test is fitted, and the engineering diaphram wall partly or entirely separates Shanghai City I artesian aquifers, the author
It is fitted using all period observation data of pumped well, it is as a result clearly irrational.At present, for being made using water-stop curtain
Bailing test under solves hydrogeological parameter, and what is be most widely used is Numerical inverse method.As poplar build the people in 2008
《Civil engineering journal》On deliver《Tianjin station bailing test numerical inversion is analyzed》, obtained each water-bearing layer using numerical method and oozed
Saturating coefficient, water storage rate.Using numerical method can determine water-bearing layer level to and vertical infiltration coefficient, but set up numerical model and enter
Row calculates more complicated, time-consuming oversize, for field engineer, it is difficult to the hydrology in water-bearing layer is directly determined using numerical method
Geologic parameter.Therefore, existing technical literature can not be still provided when can directly determine to draw water in the lower foundation ditch of water-stop curtain effect
The method of water-bearing layer hydrogeological parameter.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of simple, convenient, and reliable in water-stop curtain
The determination method of water-bearing layer hydrogeological parameter, is provided for the construction and environmental protection of underground engineering when being drawn water in the lower foundation ditch of effect
More reliable foundation.
To realize object above, the present invention provides a kind of determination method of the hydrogeological parameter under water-stop curtain effect,
Methods described is the pumped well pump-out during experiment is determined on the basis of obtaining soil layer information and hydrogeological information, right with half
Inspection well drawdown and correspondence time during number coordinate system record experiment, divided not according to the drawdown time graph feature of record
The same period, carry out fitting a straight line to the second period later data and the 3rd period data respectively, the second period intercept of record and
Slope over 10 when the 3rd, so that it is determined that the hydrogeological parameter in water-bearing layer.
Methods described comprises the following steps：
The first step, obtains the soil layer information and hydrogeological information in place；
Second step, with reference to design of foundation pit and precipitation scheme, determines foundation pit enclosure structure information, precipitation well information；
3rd step, determines the water level of inspection well：
Measure bailing test during inspection well observation time t and equivalent water level drawdown value, set up semilog coordinate system, with when
Between t be transverse axis, drawdown s be the longitudinal axis, make the s-lgt scatter diagrams that drawdown is changed over time；
4th step, is analyzed drawdown, and s-lgt scatter diagrams are divided into different periods：
Judge water level by sealing curtain according to water-stop curtain depth, precipitation well depth and s-lgt scatter diagram variation tendency features
The influence degree of curtain and dewatering well, and water level is changed with time be divided into four different periods, i.e., first, second, third,
4th period；
First period refers to：Bailing test initial stage, drawdown is not influenceed by water-stop curtain, in s-lgt scatter diagrams
On show as in foundation ditch inspection well drawdown and be less than a setting value (in engineering during such as less than 5% times of maximum stage drawdown
Negligible numerical value), and slowly increase with the time, foundation ditch External Observation Well Water Level drawdown is 0, and the window duration is very short；
Second period refers to：The change of drawdown is influenceed by water-stop curtain, is shown as on s-lgt scatter diagrams
Drawdown is with time rapid growth, and drawdown rate of rise and the window duration are drawn water well depth and water-stop curtain
Into the effect of depth of artesian aquifer, and the period later data point fits straight line, the friendship of its extended line and transverse axis
Point is overlapped with the intersection point of Cooper-Jacob straight lines under equal water pumping conditions；
3rd period referred to：The change of drawdown is not influenceed by water-stop curtain, and water is shown as on s-lgt scatter diagrams
Potential drop increases with the time deeply, it is characterized in that the straight slope that data point is fitted under different water-stop curtain depth and the equal bar that draws water
Cooper-Jacob straight lines under part have identical slope, and the straight slope that the slope is fitted less than the second moment, should
Window duration is relevant with the depth of draw water well depth and water-stop curtain into artesian aquifer；
4th period refers to:The change of drawdown is not influenceed by water-stop curtain, is showed on s-lgt scatter diagrams
Slowly increase with the time for drawdown, data point fitting a straight line slope is 0.
5th step, the hydrogeology of artesian aquifer is determined according to the drawdown data point of the second period and the 3rd period
Parameter.
Preferably, in the first step, described soil layer information refers to：Soil sample progress below foundation ditch is obtained by boring extracting soil
Grain analysis experiment, determines each grain group grogs content of soil sample, and refer to China《The criteria for classification (GBJ145-90) of soil》Determine the soil body
Type；The amount of fetching earth is determined according to test specimen amount, is advisable with no less than three test specimens.
Preferably, in the first step, described hydrogeological information refers to：Aqueous channel type and artesian aquifer thickness b, lead to
The soil layer information of boring extracting soil acquisition is crossed to judge.
It is highly preferred that described aqueous channel type refers to：Phreatic aquifer without water-proof top plate and there is water proof roof and floor
Artesian aquifer.
Preferably, in second step, described foundation pit enclosure structure information refers to：Foundation pit waterproof curtain depth.
Preferably, in second step, described dewatering well information includes：Dewatering well position, precipitation well depth, dewatering well filtering
Device position and length, pumped well draw water layer position, inspection well observation layer position and pumped well pump-out；Wherein：
Described filter refers to：In water-bearing layer, can be permeable pipe is placed in dewatering well；
Described pumped well draw water layer position refer to：The layer position drawn water where well tube filter；
Described inspection well observation layer position refers to：The layer position observed where well tube filter；
Described pumped well pump-out refers to：The water that the single pumped well unit interval extracts out, is designated as Qw；The pump-out
Obtained by water meter measurement.
It is highly preferred that described water meter measurement refers to：Water meter is installed on the drainpipe near pumped well well head, startup is taken out
Water pump, treats that drainpipe starts the initial reading of water meter under water outlet postscript, after timing t hours (t >=2), reads the real-time reading of water meter
Number, the difference divided by inspection well observation time t of two numbers are pumped well pump-out hourly.
Preferably, in the 3rd described step, the water level of described inspection well is measured by lining rope.
It is highly preferred that described lining rope measurement refers to：Lining rope is put into observation borehole measurement, for measuring water in inspection well
Potential drop is deep；Carry out level measuring when, after bailing test pumped well starts to draw water the 1st, 2,3,4,6,8,10,15,20,25,
30th, 40,50,60,80,100,120min is measured, and until terminating, and can record correspondence every 30min measurements once later
Moment drawdown s.
Preferably, described Cooper-Jacob straight lines refer to：It is that artesian aquifer thickness is constant under native state
In the case of, the data point of inspection well drawdown and corresponding time under semilog coordinate s-lgt is fitted during water withdrawal
Straight line.
Preferably, in the 5th step, the hydrogeological parameter of described artesian aquifer includes：Artesian aquifer coefficient of transmissibility
T, osmotic coefficient k, coefficient of storage S；
Specifically determine in the following manner：
(1) the 3rd period drawdown data point is fitted to straight line, the straight slope is designated as is；
The artesian aquifer coefficient of transmissibility T meets below equation：
Wherein：QwFor pumped well pump-out, isFor the 3rd period fitting a straight line slope, the isMeet below equation：
Wherein：s1、s2It is deep for any WAWQ potential drop in the 3rd period fitting a straight line；lgt1、lgt2Respectively s1、s2Correspondence
Time；
The osmotic coefficient k meets below equation：
Wherein, b is artesian aquifer thickness；
(2) the second period later data point is fitted to straight line section, extends the straightway and met at a bit with transverse axis, note
For t0；
The coefficient of storage S meets below equation：
Wherein：T is coefficient of transmissibility；t0For fitting a straight line extended line and the intersection point of transverse axis；R is inspection well and pumped well spacing
From being measured by steel ruler.
Compared with prior art, the present invention has following beneficial effect：
Under conditions of being present in the invention provides a kind of foundation pit waterproof curtain in artesian aquifer, when being drawn water in hole, directly
The method for determining artesian aquifer hydrogeological parameter is connect, foundation is provided for base pit dewatering design, is the safety and ring of engineering
The protection in border provides effective guarantee.The inventive method is simple, practical, is easy to promote, with very big application value.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is that one embodiment of the invention inspection well hydrogeological parameter determines schematic diagram；
Fig. 2 is the location diagram of one embodiment of the invention pumped well and inspection well；
Fig. 3 is one embodiment of the invention inspection well drawdown curve fitted figure at times.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
As shown in Figure 1-Figure 3, the present embodiment provides a kind of determination method of the hydrogeological parameter under water-stop curtain effect,
For certain Shanghai rail transit ventilating shaft engineering, design of foundation pit size is length of side 49m × 22.5m rectangle, excavation of foundation pit depth
28.15m, building enclosure is used as using diaphram wall；Methods described comprises the following steps：
The first step, the soil layer division information and artesian water information in place are obtained by boring extracting soil method.
By boring extracting soil and refer to China《The criteria for classification (GBJ145-90) of soil》Obtain top-down clay distribution
For：
Buried depth (0.00-1.82m) is miscellaneous fill；
Buried depth (1.82-14.12m) is grey sandy silt；
Buried depth (14.12-20.12m) is grey silt clay；
Buried depth (20.12-24.12m) is gray clay；
Buried depth (24.12-27.32m) is dark green-olive drab(O.D) silty clay；
Buried depth (27.32-32.02) is olive drab(O.D) sandy silt；
Buried depth (32.02-65.00) is straw colour~grey Extra-fine sand.
The soil layer information obtained by boring extracting soil, it may be determined that buried depth (0.00-1.82m) is miscellaneous fill and buried depth (1.82-
Grey sandy silt 14.12m) is phreatic aquifer；The olive drab(O.D) sandy silt and buried depth of buried depth (27.32-32.02)
The straw colour of (32.02-65.00)~grey Extra-fine sand is artesian aquifer.Artesian aquifer thickness b can determine that according to soil layer information
For 37m.
Second step, with reference to design of foundation pit and precipitation scheme, determines foundation pit enclosure structure information, precipitation well information.
Foundation pit enclosure structure information：Diaphram wall depth is 48.6m.
Precipitation well information：Pumped well is located in foundation ditch, well depth 50m, and filter is located in artesian aquifer, and long 17m draws water
Well draws water layer for artesian aquifer, and pumped well pump-out is 744m3/d；Inspection well is similarly positioned in foundation ditch, well depth 43m, mistake
Filter is located in artesian aquifer, long 10m.
3rd step, inspection well drawdown value and records corresponding observation time t during measuring bailing test using lining rope, builds
Vertical semilog coordinate system, using inspection well observation time t as transverse axis, drawdown s is the longitudinal axis, makes drawdown and changes over time
Scatter diagram.Observation as shown in Figure 3.
4th step, is analyzed s-lgt scatter diagrams, and divide different periods.
Trend feature is changed over time according to drawdown, s-lgt scatter diagrams four periods are divided into, as shown in Figure 3.
First 2 minutes, drawdown was less than 0.58m (5% times of maximum stage drawdown), is divided into for the first period；2nd minute to the 59th point
Clock, drawdown rapid growth was divided into for the second period；59th minute to the 860th minute, drawdown comparatively fast increased, and can
Straight line is fitted to, was divided into for the 3rd period；After 860th minute, drawdown is almost unchanged, is divided into for the 4th period.
5th step, the hydrogeology of artesian aquifer is determined according to the drawdown data point of the second period and the 3rd period
Parameter.
(1) the 3rd period drawdown data point is fitted to straight line, straight line as shown in Figure 3.
Determine fitting a straight line slope is：Take in fitting a straight line 2 points (lg100,9.2), (lg1000,11.9), then straight line is oblique
Rate is：
Artesian aquifer coefficient of transmissibility T is：
The osmotic coefficient k of artesian aquifer is：
(2) the second second half section period drawdown data point is fitted to straight line, dotted line as shown in Figure 3.
Extend this straightway transverse cross axle fitted in a point t0, t0=4.7min=0.00326d；
As shown in Fig. 2 measuring the distance between inspection well and pumped well with steel ruler：R=15m；
The coefficient of storage S of artesian aquifer is：
Method of the present invention provides foundation for base pit dewatering design, and the protection of safety and environment for engineering is provided
Effective guarantee.The inventive 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 (8)
1. a kind of determination method of the hydrogeological parameter under water-stop curtain effect, it is characterised in that methods described includes as follows
Step：
The first step, obtains the soil layer information and hydrogeological information in place；
Second step, with reference to design of foundation pit and precipitation scheme, determines foundation pit enclosure structure information, precipitation well information；
3rd step, determines the water level of inspection well：
Inspection well observation time t and equivalent water level drawdown value during bailing test are measured, semilog coordinate system is set up, with time t
For transverse axis, drawdown s is the longitudinal axis, makes the s-lgt scatter diagrams that drawdown is changed over time；
4th step, is analyzed drawdown, and s-lgt scatter diagrams are divided into different periods：
According to water-stop curtain depth, precipitation well depth and s-lgt scatter diagram variation tendency features judge water level by water-stop curtain and
The influence degree of dewatering well, and water level is changed with time be divided into four different periods, i.e., first, second, third, fourth
Period；
First period refers to：Bailing test initial stage, drawdown is not influenceed by water-stop curtain, in s-lgt scatter diagram upper tables
Now it is less than a setting value for inspection well drawdown in foundation ditch, and slowly increases with the time, foundation ditch External Observation Well Water Level drawdown is
0, the window duration is short；
Second period refers to：The change of drawdown is influenceed by water-stop curtain, and water level is shown as on s-lgt scatter diagrams
Drawdown is with time rapid growth, and drawdown rate of rise and the window duration are drawn water well depth and water-stop curtain enters
The effect of depth of artesian aquifer, and the period later data point fits the intersection point of straight line, straight line extended line and transverse axis
Overlapped with the intersection point of Cooper-Jacob straight lines under equal water pumping conditions；
3rd period refers to：The change of drawdown is not influenceed by water-stop curtain, and water is shown as on s-lgt scatter diagrams
Potential drop increases with the time deeply, it is characterized in that the straight slope that data point is fitted under different water-stop curtain depth and the equal bar that draws water
Cooper-Jacob straight lines under part have identical slope, and the straight slope that the slope is fitted less than the second moment, should
Window duration is relevant with the depth of draw water well depth and water-stop curtain into artesian aquifer；
4th period refers to:The change of drawdown is not influenceed by water-stop curtain, and water is shown as on s-lgt scatter diagrams
Potential drop slowly increases with the time deeply, and data point fitting a straight line slope is 0；
5th step, the hydrogeology for determining artesian aquifer according to the drawdown data point of the second period and the 3rd period is joined
Number；
The hydrogeological parameter of described artesian aquifer includes：Artesian aquifer coefficient of transmissibility T, osmotic coefficient k, coefficient of storage
S；Specifically determine in the following manner：
(1) the 3rd period drawdown data point is fitted to straight line, the 3rd period fitting a straight line slope is designated as is；
The artesian aquifer coefficient of transmissibility T meets below equation：
<mrow>
<mi>T</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2.30</mn>
<msub>
<mi>Q</mi>
<mi>w</mi>
</msub>
</mrow>
<mrow>
<mn>4</mn>
<msub>
<mi>&pi;i</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein：QwFor pumped well pump-out, isFor the 3rd period fitting a straight line slope, the isMeet below equation：
<mrow>
<msub>
<mi>i</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>s</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>s</mi>
<mn>1</mn>
</msub>
</mrow>
<mrow>
<msub>
<mi>lgt</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>lgt</mi>
<mn>2</mn>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein：s1、s2It is deep for any WAWQ potential drop in the 3rd period fitting a straight line；lgt1、lgt2Respectively s1、s2When to correspondence
Between；
The osmotic coefficient k meets below equation：
<mrow>
<mi>k</mi>
<mo>=</mo>
<mfrac>
<mi>T</mi>
<mi>b</mi>
</mfrac>
</mrow>
Wherein, b is artesian aquifer thickness；
(2) the second period later data point is fitted to straight line section, extends the straightway and met at a bit with transverse axis, fitting is straight
The intersection point of line extended line and transverse axis is designated as t0；
The coefficient of storage S meets below equation：
<mrow>
<mi>S</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2.25</mn>
<msub>
<mi>Tt</mi>
<mn>0</mn>
</msub>
</mrow>
<msup>
<mi>r</mi>
<mn>2</mn>
</msup>
</mfrac>
</mrow>
Wherein：T is coefficient of transmissibility；t0For fitting a straight line extended line and the intersection point of transverse axis；R is inspection well and the inter-well distance that draws water, by
Steel ruler is measured.
2. a kind of determination method of hydrogeological parameter under water-stop curtain effect according to claim 1, its feature exists
In in the first step：
Described soil layer information refers to：Soil sample below foundation ditch is obtained by boring extracting soil and carries out screen analysis test, soil sample is determined
Each grain group grogs content, and refer to China《The criteria for classification (GBJ145-90) of soil》Determine soil body type；The amount of fetching earth is according to test specimen
Amount determination, no less than three test specimens；
Described hydrogeological information refers to：Aqueous channel type and artesian aquifer thickness b, the soil layer obtained by boring extracting soil
Information judges.
3. a kind of determination method of hydrogeological parameter under water-stop curtain effect according to claim 2, its feature exists
In described aqueous channel type refers to：Phreatic aquifer and the artesian aquifer for having water proof roof and floor without water-proof top plate.
4. a kind of determination method of hydrogeological parameter under water-stop curtain effect according to claim 1, its feature exists
In in second step：
Described foundation pit enclosure structure information refers to：Foundation pit waterproof curtain depth；
Described dewatering well information includes：Dewatering well position, precipitation well depth, dewatering well filters locations and length, pumped well
Draw water layer position, inspection well observation layer position and pumped well pump-out.
5. a kind of determination method of hydrogeological parameter under water-stop curtain effect according to claim 4, its feature exists
In described precipitation well tube filter refers to：In water-bearing layer, can be permeable pipe is placed in dewatering well；
Described pumped well draw water layer position refer to：The layer position drawn water where well tube filter；
Described inspection well observation layer position refers to：The layer position observed where well tube filter；
Described pumped well pump-out QwRefer to：The water that the single pumped well unit interval extracts out, the pump-out is measured by water meter
Obtain.
6. a kind of determination method of hydrogeological parameter under water-stop curtain effect according to claim 5, its feature exists
In described water meter measurement refers to：Water meter is installed on the drainpipe near pumped well well head, starts suction pump, treats drainpipe
Start after the initial reading of water meter under water outlet postscript, timing t hour, t >=2, the real time readouts of reading water meter, the difference of two numbers
Divided by inspection well observation time t is pumped well pump-out hourly.
7. a kind of determination method of hydrogeological parameter under water-stop curtain effect according to claim 1, its feature exists
In in the 3rd step, the water level of described inspection well is measured by lining rope, and the lining rope measurement refers to：Lining rope is put into inspection well
Middle measurement, for measuring drawdown in inspection well；When carrying out level measuring, the after bailing test pumped well starts to draw water
1min、2min、3min、4min、6min、8min、10min、15min、20min、25min、30min、40min、50min、
60min, 80min, 100min, 120min are measured, later every 30min measurement once, until terminate, and record to correspondence when
Carve drawdown s.
8. a kind of determination method of hydrogeological parameter under water-stop curtain effect according to claim 1, its feature exists
In described Cooper-Jacob straight lines refer to：Under native state be artesian aquifer thickness it is constant in the case of, individual well is taken out
The straight line that the data point of inspection well drawdown and corresponding time under semilog coordinate s-lgt is fitted during water.
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| CN111946333B (en) * | 2020-07-02 | 2021-05-18 | 临沂矿业集团菏泽煤电有限公司 | Simple test and solution method for aquifer hydrogeological parameters under curtain grouting condition |
| CN112900504B (en) * | 2021-01-13 | 2022-04-15 | 南京福欧地下空间数据科技有限公司 | Method and system for identifying water leakage of waterproof curtain of foundation pit |
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| CN102392461A (en) * | 2011-09-09 | 2012-03-28 | 同济大学 | Method for detecting hidden leakage point on waterproof curtain of foundation pit |
| CN103806479B (en) * | 2014-01-27 | 2016-08-17 | 广东省建筑科学研究院集团股份有限公司 | A kind of pile foundation combined casting reinforced construction method of combination water-stop curtain |
| CN104141314B (en) * | 2014-08-06 | 2016-03-30 | 中钢集团马鞍山矿山研究院有限公司 | The method of complete seepage proof curtain is formed in rock, native two media |
| CN104153381A (en) * | 2014-08-29 | 2014-11-19 | 云南大学 | Waterproof curtain pile, waterproof curtain and construction method of waterproof curtain pile |
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