CN106680176A - Double-tube inner tube method for determining consolidation coefficient and deformation hysteresis index of aquitard in situ - Google Patents
Double-tube inner tube method for determining consolidation coefficient and deformation hysteresis index of aquitard in situ Download PDFInfo
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- CN106680176A CN106680176A CN201611147354.4A CN201611147354A CN106680176A CN 106680176 A CN106680176 A CN 106680176A CN 201611147354 A CN201611147354 A CN 201611147354A CN 106680176 A CN106680176 A CN 106680176A
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- 238000007596 consolidation process Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 239000003673 groundwater Substances 0.000 claims description 20
- 239000002689 soil Substances 0.000 claims description 19
- 238000002474 experimental method Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
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- 229920005479 Lucite® Polymers 0.000 claims description 4
- 230000000994 depressogenic effect Effects 0.000 claims description 4
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 description 6
- 230000008595 infiltration Effects 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention discloses a double-tube inner tube method for determining a consolidation coefficient and a deformation hysteresis index of an aquitard in situ. Firstly, a double-tube test model for determining the consolidation coefficient and the deformation hysteresis index of the aquitard by adopting the double-tube inner tube method is formed on site; based on the double-tube test model, a settling volume formula analytic solution of an inner tube aquitard under the conditions that a water head of an outer tube is reduced by a certain constant and an underground water level of one side of a cylinder of the inner tube aquitard is kept unchanged is derived; secondly, according to experimental data that a settling volume of the aquitard in an inner tube is changed along with time, which is measured on the basis of a dial indicator arranged in the inner tube aquitard, the consolidation coefficient and the deformation hysteresis index of the aquitard are determined by adopting a curve fitting method. The double-tube inner tube method disclosed by the invention has the following advantages that the derived analytic solution is strict in theory; in-situ testing on the consolidation coefficient and the deformation hysteresis index of the aquitard is implemented; a testing apparatus and a testing process are simple and easy for operation; a water releasing rate, the consolidation coefficient, the deformation hysteresis index, a conductivity coefficient and a permeability coefficient of the aquitard can be simultaneously obtained, and multiple parameters are acquired.
Description
Technical field
The present invention relates to a kind of in situ two-tube interior tube method for determining the aquiclude coefficient of consolidation and deformation hysteresis index, especially
It is a kind of method of scene determination leaky system rate, the coefficient of conductivity and infiltration coefficient.
Background technology
Aquifer System seepage and deformation is the most immediate cause for causing regional surface subsidence.Surface subsidence is a kind of ground
The environmental geology phenomenon that absolute altitude is slowly reduced, is a kind of not compensable permanent environment and resources loss, can be developed when serious
It is geological disaster.From hydrogeologic aspect, deep covering layer is exactly aquifer System the most typical.For example, China is long
River delta deep covering layer is exactly the aquifer System being made up of three artesian aquifers and four aquicludes, and its thickness reaches
50~200m.In Yangtze River Delta because area of the surface subsidence more than 200mm that groundwater mining causes has accounted for region area
1/10th, wherein cumulative maximum settling amount reach 2.80m, the economic loss having resulted in is up to 50,000,000,000 dollars.
For the seepage flow-problem on deformation of saturation aquiclude, saturation aquiclude percolation law and change are studied respectively in the past
The achievement of shape rule is more, and the achievement for studying saturation aquiclude seepage―deformation coupling relation simultaneously recently is quite a few.But these
Achievement is nearly all that the relation of seepage flow-deformation is studied on the basis of existing seepage flow-Deformation control equation；It is not with suspicion these
With the presence or absence of problem or without the problem for finding to exist between the associated parameter of governing equation.But many problems are still stranded
Disturb us：Although 1. the coefficient of consolidation in the coefficient of conductivity and consolidation equation in osmotic control equation should belong to same in form
The conduction that field hydrogeology experiment is obtained is rarely employed in one parameter, but code, specification at us or in real work
The coefficient of consolidation that coefficient is obtained instead of coefficient of consolidation calculating soil deformation or using consolidation test is calculated instead of the coefficient of conductivity and oozed
Flow problem, reason is that the two always has bigger difference.2. from terms of seepage flow and consolidation governing equation form, saturation aquiclude exists
The process that seepage flow-deformation occurs should be synchronous, actually it is found that deformation lags behind seepage flow all the time.3. based on existing
Seepage flow-consolidation model prediction calculates the deformation of soil body sedimentation, it is difficult to be matched with actual observation result, often calculated value is all different
Degree is bigger than normal.
The content of the invention
Goal of the invention：To overcome the shortcomings of the existing technology, the present invention is based on the two-tube in-situ testing technique of drilling, according to weak permeable
Aquiclude settling amount Formula Parsing solution under the conditions of the head a certain constant of reduction of layer cylinder side, proposes that a kind of original position determines weak
The two-tube interior tube method of the water layer coefficient of consolidation and deformation hysteresis index.
Technical scheme：In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
Original position determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index, comprises the following steps：
1), be formed by the scene it is two-tube in interior tube method determine the two-tube of the aquiclude coefficient of consolidation and deformation hysteresis index
Test model, based on double column run model, to derive and reduce a certain constant in outer tube head and inner tube aquiclude cylinder side is protected
Hold the settling amount Formula Parsing solution of inner tube aquiclude under level of ground water permanence condition；
2), according to aquiclude settling amount in the inner tube based on the dial gauge measurement arranged in inner tube aquiclude with the time
The experimental data of change, the aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination.
Operation principle：Experimental provision of the present invention and experimentation are simple, easy to operate, and analytic solutions are theoretical tight, using distribution
Method determines parameter, and method is simply easily grasped, and can solve current scene in situ cannot determine that the weak permeable coefficient of consolidation and deformation are stagnant
The key technical problem of index, overcomes the error tested in laboratory after field sampling afterwards；Meanwhile, once experiment can be with
Leaky system rate, the coefficient of consolidation, deformation hysteresis index, the coefficient of conductivity and infiltration coefficient are tried to achieve simultaneously, the parameter of acquisition is more.
Most importantly, the weak permeable coefficient of consolidation of determination in situ and deformation hysteresis index are the method achieve, therefore, the method has very
Good application value.
It is preferred that, the water level of the outer tube head is not less than aquiclude top surface.
The implementation method of the double column run model is comprised the following steps：
1), at the scene drilling to the aquiclude for needing test top surface, while by the top surface under outer tube to aquiclude
And soil sample more than aquiclude top surface in outer tube is taken out into drilling；
2), outer tube is depressed into the bottom surface of aquiclude using rig pressure from the top surface of aquiclude；
3) inner tube of the diameter less than outer tube diameter, is put into outer tube hub, equally, will be placed under inner tube to aquiclude
Top surface；
4) inner tube is pressed into the examination section bottom of the aquiclude for needing test, and by inhaling the side of mud with rig pressure,
Formula suctions out the aquiclude soil sample in outer tube；
5), laying gravel is as loaded filter and right in inner tube in the annular sleeve pipe formed between outer tube and inner tube
Should in aquiclude examination section tip position lay gravel as loaded filter, be formed by it is two-tube in interior tube method determine aquiclude
The double column run model of the coefficient of consolidation and deformation hysteresis index.
Water level is consistent with the outer level of ground water that drills in ensuring annular sleeve pipe and inner tube；Portion's port position is set on inner pipe
Ma Liaote bottles, Ma Liaote bottles of water inlet pipe lower end is placed at level of ground water elevation, water level in inner tube is kept fixed underground
Water level；The pump line that draws water is arranged in annular sleeve pipe, suction pump bottom of the tube is placed between level of ground water and examination section top surface, in examination
Test after being ready to complete, instantaneously open suction pump, make the water-head of water level generation in annular sleeve pipe, and keep the head of inner and outer pipes
Difference immobilizes.
Settlement observation system is arranged in inner tube, the settlement observation system includes the percentage for sequentially connecting from top to bottom
Table, rigid rod and base；Base is lucite plectane, and gathered permeable hole thereon, below the reading reflection base of dial gauge
The settling amount of soil layer；After experiment is ready to complete, suction pump is opened, water level produces water-head in making annular sleeve pipe, and keeps
The head difference of inner and outer pipes immobilizes, and records the settling amount that the dial gauge arranged in inner tube recorded and change over time.
Based on double column run model, the water level derived in outer tube head is not less than the aquiclude top surface a certain constant of reduction,
And inner tube aquiclude cylinder side keeps the settling amount Formula Parsing solution of inner tube aquiclude under level of ground water permanence condition；So
The reality for being changed over time according to aquiclude settling amount in the inner tube based on the dial gauge measurement arranged in inner tube aquiclude afterwards
Certification of registered capital material, the aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination.
The experimental data that aquiclude settling amount is changed over time in inner tube based on the dial gauge measurement arranged in inner tube,
The aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination, the settling amount S measured in the inner tube that will be recorded with
S (t)~t measured curves are made in the change of time t in the log-log coordinate system with standard curve identical molds, withStandard is bent
Line distribution, makes two curves overlappeds, and an optional match point writes down corresponding coordinate value[S]、[t], substitutes into corresponding
Formula calculates aquiclude coefficient of consolidation CvWith deformation hysteresis index τv0。
It is preferred that, the outer tube diameter is 127mm；Diameter of inner pipe is 75mm, and inner tube material is PVC inner tubes.
The NM technology of the present invention is prior art.
Beneficial effect：Compared with prior art, it is provided by the present invention to determine the aquiclude coefficient of consolidation and deformation hysteresis
The method of index has advantages below：
1. the analytic solutions for pushing away, it is theoretical tight, therefore method has strict theoretical foundation；
2. the in-situ test of the aquiclude coefficient of consolidation and deformation hysteresis index, and experimental rig and process of the test are realized
Simply, it is easy to operate；
3. parameter is determined using herbal combination, method is simply easily grasped；
4. once experiment can try to achieve simultaneously leaky system rate, the coefficient of consolidation, deformation hysteresis index, the coefficient of conductivity and
Infiltration coefficient, the parameter of acquisition is more, and the method has good application value.
Brief description of the drawings
Fig. 1 is the flow chart of the embodiment of the present invention；
Fig. 2 is the double column run model of the embodiment of the present invention；
Fig. 3 is the present inventionStandard curve；
Settlement calculation values and observation matched curve of the Fig. 4 for the embodiment of the present invention；
In figure：1 is outer tube, and 2 is inner tube, and 3 is Ma Liaote bottles, and 4 is dial gauge, and 5 is rigid rod, and 6 is base, and 7 is filter
Layer, 8 is examination section, and 9 is suction pump.
Specific embodiment
For a better understanding of the present invention, it is with reference to the embodiment content that the present invention is furture elucidated but of the invention
Content is not limited solely to the following examples.
Original position determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index, it is characterised in that：Including with
Lower step：
1), be formed by the scene it is two-tube in interior tube method determine the two-tube of the aquiclude coefficient of consolidation and deformation hysteresis index
Test model, based on double column run model, to derive and reduce a certain constant in outer tube head and inner tube aquiclude cylinder side is protected
Hold the settling amount Formula Parsing solution of inner tube aquiclude under level of ground water permanence condition；The water level of outer tube head is not less than weak permeable
Layer top surface；
2), according to aquiclude settling amount in the inner tube based on the dial gauge measurement arranged in inner tube aquiclude with the time
The experimental data of change, the aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination.
The implementation method of double column run model is comprised the following steps：
1), drilling extremely needs the top surface of the aquiclude of test at the scene, while will be extremely weak under the outer tube of a diameter of 127mm
Soil sample more than aquiclude top surface in outer tube is simultaneously taken out drilling by the top surface of pervious bed；
2), outer tube is depressed into the bottom surface of aquiclude using rig pressure from the top surface of aquiclude；
3) the PVC inner tubes of a diameter of 75mm, are put into outer tube hub, equally, will be placed to aquiclude under PVC inner tubes
Top surface；
4) PVC inner tubes are pressed into the examination section bottom of the aquiclude for needing test, and by inhaling mud with rig pressure,
Mode suctions out the aquiclude soil sample in outer tube；
5) gravel, is laid in the annular sleeve pipe formed between outer tube and PVC inner tubes as loaded filter, and in PVC
In pipe corresponding to aquiclude examination section tip position lay gravel as loaded filter, be formed by it is two-tube in interior tube method determine it is weak
The double column run model of the pervious bed coefficient of consolidation and deformation hysteresis index.
Water level is consistent with the outer level of ground water that drills in ensuring annular sleeve pipe and PVC inner tubes；In PVC inner tubes upper port position
Ma Liaote bottles is installed, Ma Liaote bottles of water inlet pipe lower end is placed at level of ground water elevation, keep water level in PVC inner tubes
Fixed underground water level；The pump line that draws water is arranged in annular sleeve pipe, suction pump bottom of the tube is placed into level of ground water with examination section top surface
Between, after experiment is ready to complete, suction pump is instantaneously opened, make the water-head of water level generation in annular sleeve pipe, and keep interior
The head difference of outer tube immobilizes.
Arrange settlement observation system in PVC inner tubes, dial gauge that settlement observation system includes sequentially connecting from top to bottom,
Rigid rod and base；Base is lucite plectane, and gathered permeable hole thereon, the reading reflection following soil layer of base of dial gauge
Settling amount；After experiment is ready to complete, suction pump is opened, water level produces water-head in making annular sleeve pipe, and keeps inside and outside
The head difference of pipe immobilizes, and records the settling amount that the dial gauge arranged in inner tube recorded and change over time.
Based on double column run model, the water level derived in outer tube head is not less than the aquiclude top surface a certain constant of reduction,
And inner tube aquiclude cylinder side keeps the settling amount Formula Parsing solution of inner tube aquiclude under level of ground water permanence condition；So
The reality for being changed over time according to aquiclude settling amount in the inner tube based on the dial gauge measurement arranged in inner tube aquiclude afterwards
Certification of registered capital material, the aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination.
The experimental data that aquiclude settling amount is changed over time in inner tube based on the dial gauge measurement arranged in inner tube,
The aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination, the settling amount S measured in the inner tube that will be recorded with
S (t)~t measured curves are made in the change of time t in the log-log coordinate system with standard curve identical molds, withStandard curve
Distribution, makes two curves overlappeds, and an optional match point writes down corresponding coordinate value[S]、[t], substitutes into corresponding public
Formula calculates aquiclude coefficient of consolidation CvWith deformation hysteresis index τv0。
The principle of aquiclude parameter determination：
1) analytic solutions of saturation aquiclude distorted pattern：
Herein, it is considered to saturation aquiclude cylinder saturation pressure-bearing and pressure head is equal everywhere, saturation aquiclude post
Body downside head reduces certain certain valueAnd saturation aquiclude upside water level is constant；At this moment saturation aquiclude is vertical flow,
Saturation aquiclude strain model is
In formula：cvIt is the saturated soft soil coefficient of consolidation；εvIt is the unit volume deformation values of saturated soft soil；It is cylinder downside water
Potential drop depth；L is saturated soft soil thickness；mvIt is the coefficient of bulk compressibility of saturated soft soil；ρwIt is the density of water；G is acceleration of gravity；z
It is coordinate in z-axis；T is the time.
For saturated soft soil flow model in porous media I, separated variable and Fourier transform, obtaining solution is：
In formula：N is natural number；E is natural constant.
2) analytic solutions of saturation aquiclude sedimentation：
If cumulative volume deflection is in t unit level area saturation aquiclude whole thickness：
In formula：L is examination segment length；M is natural number.
There are saturation aquiclude strain model and formulaThe profile variation (sedimentation) for actually occurring
Amount be：
S (t)=(1-n) DV (t)
In formula：μsIt is saturation leaky system rate.
As t=τv0Or during t → ∞, the sedimentation of saturation aquiclude tends towards stability, and deforms in saturation aquiclude whole thickness
Amount reaches maximum
Dimensionless treatment：
Wherein,It is dimensionless drawdown；AndIt is dimensionless position and time；It is and saturation
Aquiclude property and thickness have related parameter, referred to as deformation hysteresis index.Deformation hysteresis indicial response saturation aquiclude becomes
The lag time that shape is responded to border SEA LEVEL VARIATION.
WithVariation relation curve such as Fig. 3 standard curves.
In addition, there is formulaFormula (6) can be equally obtained, i.e.,：
By formulaSubstitute into, it is noted that with admittedly
Clone number CvInstead of coefficient of conductivity a.
In formula：Q is flow of the t by position z unit level areas；K is saturation aquiclude infiltration coefficient；U is
The SEA LEVEL VARIATION value of saturation aquiclude z point ts.
Then：
WillAbove formula is substituted into, is obtained final product
3) parameter determination method
ForMoment aquiclude settling amount：
And
Above-mentioned two formulas both sides are taken the logarithm simultaneously, is had
(9), the Section 2 on the right of (10) two formulas is all constant, therefore in log-log coordinate system, tests the S (t) for obtaining
~t andStandard curve (Fig. 3) is in shape identical, simply coordinate translation S in length and breadth∞WithUsing herbal combination,
Two curves overlappeds, an optional match point are write down into corresponding coordinate value[S]、[t], substitute into above-mentioned (7), (5),
(8) formula, obtains
Release water rate：
The coefficient of consolidation：
The coefficient of conductivity：
Infiltration coefficient：K=μsa
Specific test procedure：
(1) first, at the scene drilling to the aquiclude for needing test top surface, while by the outer tube of a diameter of 127mm
Under to aquiclude top surface and soil sample more than aquiclude top surface in outer tube taken out into drilling, then will using rig pressure
Outer tube is depressed into the bottom surface of aquiclude from the top surface of aquiclude, the pvc pipe of a diameter of 75mm is then put into outer tube hub, together
Sample, will place the top surface to aquiclude under pvc pipe, then again with rig pressure drop pvc pipe be pressed into need test it is weak
The examination section bottom of water layer, and suctioned out the aquiclude soil sample in outer tube by way of inhaling mud, then in annular sleeve pipe
Laying gravel corresponds to the examination section tip position laying gravel of aquiclude as loaded filter as loaded filter in pvc pipe；
The two-tube examination that the aquiclude coefficient of consolidation and deformation hysteresis index are determined using interior tube method in two-tube is thus formd at the scene
Test model.
(2) water level is consistent with the outer level of ground water that drills in ensuring annular sleeve pipe and inner tube；In pvc pipe upper port position
Ma Liaote bottles is set, Ma Liaote bottles of water inlet pipe lower end is placed at level of ground water elevation, make water level in pvc pipe keep determining water
Position (level of ground water)；Arrangement is drawn water pump line in annular sleeve pipe, by suction pump bottom of the tube place level of ground water with next section away from
From (more than examination section top surface).
(3) after experiment is ready to complete, suction pump is instantaneously opened, makes the water-head of water level generation in annular sleeve pipe, and
The head difference of inner and outer pipes is kept to immobilize.Settlement observation system is arranged in pvc pipe, by groups such as dial gauge, rigid rod, bases
Into.Instrument is arranged on device top, is connected on chassis by rigid rod, and base is lucite plectane, has gathered thereon thoroughly
Water hole, the reading of instrument reflects the settling amount of the following soil layer of base.After experiment is ready to complete, suction pump is opened, make annular
Water level produces water-head in sleeve pipe, and keeps the head difference of inner and outer pipes to immobilize, and records the dial gauge institute arranged in inner tube
The settling amount of record is changed over time.
(4) record：Dial gauge settle discharge observation time, preferably open suction pump after the 1st, 2,3,4,6,8,10,15,
20th, 25,30,40,50,60,80,100, respectively observation once, is recorded in table 120min clocks, can be observed every 30min clocks later
Once.
(5) lasting observation, until be basically unchanged every 30min dial gauge settling amounts, can termination test.
(6) parameter is calculated：The settling amount S that will be measured in the inner tube of record is with the change of time t identical with standard curve
Make S (t)~t measured curves in the log-log coordinate system of mould, withStandard curve distribution, makes two curves overlappeds, optional one
Match point, writes down corresponding coordinate value[S]、[t], substitutes into respective formula and calculates aquiclude coefficient of consolidation CvWith
Deformation hysteresis index τv0。
Embodiment
Cumulative settling in table 1 is changed with time and makees S (t)~t measured curves (Fig. 4 centre circles in log-log coordinate system
Point) withStandard curve (solid line in figure) distribution, makes two curves overlappeds (such as Fig. 4), and an optional match point writes down correspondence
Coordinate value[S]=3.16,[t]=62, substitution formula (7), (5), (8) obtain
Release water rate：
The coefficient of consolidation：
Known average pore is than e=0.861, porosity
The coefficient of conductivity：
Infiltration coefficient：K=μsA=6.58 × 10-2× 0.17=1.12 × 10-2(m/d)
Deformation hysteresis index：
The deformation observation data of table 1
The above is only the preferred embodiment of the present invention, it should be pointed out that：Come for those skilled in the art
Say, under the premise without departing from the principles of the invention, each facility locations can also be adjusted, these adjustment also should be regarded as this hair
Bright protection domain.
Claims (9)
1. original position determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index, it is characterised in that：Including following
Step：
1), be formed by the scene it is two-tube in interior tube method determine the double column run of the aquiclude coefficient of consolidation and deformation hysteresis index
Model, based on double column run model, derives in a certain constant of outer tube head reduction and inner tube aquiclude cylinder side retentively
The settling amount Formula Parsing solution of inner tube aquiclude under lower water level permanence condition；
2), changed over time according to aquiclude settling amount in the inner tube based on the dial gauge measurement arranged in inner tube aquiclude
Experimental data, the aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination.
2. original position according to claim 1 determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index,
It is characterized in that：The water level of the outer tube head is not less than aquiclude top surface.
3. original position according to claim 1 determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index,
It is characterized in that：The implementation method of the double column run model is comprised the following steps：
1), at the scene drilling to need test aquiclude top surface, while by under outer tube to aquiclude top surface and by
Soil sample in outer tube more than aquiclude top surface takes out drilling；
2), outer tube is depressed into the bottom surface of aquiclude using rig pressure from the top surface of aquiclude；
3) inner tube of the diameter less than outer tube diameter, is put into outer tube hub, equally, will be placed under inner tube to the top of aquiclude
Face；
4) inner tube is pressed into the examination section bottom of the aquiclude for needing test with rig pressure, and will by way of inhaling mud
Aquiclude soil sample in outer tube is suctioned out；
5) gravel, is laid in the annular sleeve pipe formed between outer tube and inner tube as loaded filter, and is corresponded in inner tube
Aquiclude examination section tip position lay gravel as loaded filter, be formed by it is two-tube in interior tube method determine aquiclude consolidate
The double column run model of coefficient and deformation hysteresis index.
4. original position according to claim 3 determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index,
It is characterized in that：Water level is consistent with the outer level of ground water that drills in ensuring annular sleeve pipe and inner tube；Portion's port position on inner pipe
Ma Liaote bottles is set, Ma Liaote bottles of water inlet pipe lower end is placed at level of ground water elevation, make water level in inner tube keep fixing
Level of ground water；The pump line that draws water is arranged in annular sleeve pipe, suction pump bottom of the tube is placed between level of ground water and examination section top surface,
After experiment is ready to complete, suction pump is instantaneously opened, make the water-head of water level generation in annular sleeve pipe, and keep inner and outer pipes
Head difference immobilizes.
5. original position according to claim 3 determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index,
It is characterized in that：Settlement observation system is arranged in inner tube, the settlement observation system includes sequentially connect from top to bottom hundred
Divide table, rigid rod and base；Base is lucite plectane, and gathered permeable hole thereon, the reading of dial gauge reflection base with
The settling amount of lower soil layer；After experiment is ready to complete, suction pump is opened, water level produces water-head in making annular sleeve pipe, and protects
The head difference for holding inner and outer pipes immobilizes, and records the settling amount that the dial gauge arranged in inner tube recorded and change over time.
6. original position according to claim 5 determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index,
It is characterized in that：Based on double column run model, it is a certain often that the water level derived in outer tube head is not less than the reduction of aquiclude top surface
Amount, and inner tube aquiclude cylinder side keeps the settling amount Formula Parsing of inner tube aquiclude under level of ground water permanence condition
Solution；Then changed over time according to aquiclude settling amount in the inner tube based on the dial gauge measurement arranged in inner tube aquiclude
Experimental data, the aquiclude coefficient of consolidation and deformation hysteresis index are determined using herbal combination.
7. original position according to claim 5 determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index,
It is characterized in that：The experiment money that aquiclude settling amount is changed over time in inner tube based on the dial gauge measurement arranged in inner tube
Material, determines the aquiclude coefficient of consolidation and deformation hysteresis index, the settling amount S measured in the inner tube that will be recorded using herbal combination
Make S (t)~t measured curves in the log-log coordinate system with standard curve identical molds with the change of time t, withStandard is bent
Line distribution, makes two curves overlappeds, and an optional match point writes down corresponding coordinate value[S]、[t], substitutes into corresponding
Formula calculates aquiclude coefficient of consolidation CvWith deformation hysteresis index τv0。
8. in situ according to claim 1-7 any one determines the double of the aquiclude coefficient of consolidation and deformation hysteresis index
Tube method in pipe, it is characterised in that：The outer tube diameter is 127mm.
9. original position according to claim 8 determines the two-tube interior tube method of the aquiclude coefficient of consolidation and deformation hysteresis index,
It is characterized in that：The a diameter of 75mm of said inner tube, inner tube material is PVC inner tubes.
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| CN111812009A (en) * | 2020-08-11 | 2020-10-23 | 中国地质科学院 | Confined aquifer solute transport experimental device |
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| CN2684182Y (en) * | 2004-03-24 | 2005-03-09 | 中国科学院新疆生态与地理研究所 | Automatic water-supplying double-ring infiltration instrument |
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