CN106013034A - Saturated soft soil vibration centrifugal infiltration instrument - Google Patents
Saturated soft soil vibration centrifugal infiltration instrument Download PDFInfo
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- CN106013034A CN106013034A CN201610526245.7A CN201610526245A CN106013034A CN 106013034 A CN106013034 A CN 106013034A CN 201610526245 A CN201610526245 A CN 201610526245A CN 106013034 A CN106013034 A CN 106013034A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/027—Investigation of foundation soil in situ before construction work by investigating properties relating to fluids in the soil, e.g. pore-water pressure, permeability
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Abstract
The invention relates to a saturated soft soil vibration centrifugal infiltration instrument. The saturated soft soil vibration centrifugal infiltration instrument comprises a support (23), a vibration platform (18), a glass scale rotating barrel (66), a rotating motor (60) fixed to the vibration platform (18) and a water injection part. The vibration platform is controlled by a first loading control table to do vibration in the horizontal direction and controlled by a second loading control table to do vibration in the vertical direction. The glass scale rotating barrel (66) comprises a barrel wall with scales, large hollow cylindrical water-permeable stone (20) and small hollow cylindrical water-permeable stone (8), wherein the large hollow cylindrical water-permeable stone (20) and the small hollow cylindrical water-permeable stone (8) are coaxial, and the glass scale rotating barrel (66) is made of water-permeable concrete. A motor rotating shaft (4) of the rotating motor (60) is arranged in the middle of the glass scale rotating barrel (66) and stretches out of the bottom of the barrel. A soil sample trough (9) is formed between the inner wall of each large hollow cylindrical water-permeable stone (20) and the outer wall of the corresponding small hollow cylindrical water-permeable stone (8), and filter paper (6) is attached to the inner wall of each soil sample trough (9). The saturated soft soil vibration centrifugal infiltration instrument can simulate the soft soil infiltration and solidification characteristics under the load effect more accurately.
Description
Technical field
The present invention relates to a kind of saturated soft soil vibration centrifugal seepage instrument, particularly relate to a kind of to calculate at oscillatory load and centrifugal according to the seepage discharge of water
The seepage instrument of the lower saturated soft soil infiltration coefficient of effect.
Background technology
Soil body penetration characteristic is the importance of Characteristics of Geotechnical Engineering research, and tolerance soil body penetration characteristic index is infiltration coefficient, and existing measurement infiltration is
The experimental provision of number mainly has constant head darcy flow instrument and varying head darcy flow instrument, and this experimental apparatus has accuracy to sand gas permeability measurement
The advantages such as height, technology maturation.
But saturated soft soil has, and moisture content is high, compressibility is high, void ratio is high, bearing capacity is low, permeate the characteristic of little " three-hypers two is low ", its seepage flow
Often show non-darcy flow characteristic.Apply existing constant head darcy flow instrument and varying head darcy flow instrument that weak soil gas permeability measurement will be led
Cause result deviation engineering actual, it is impossible to instruct geotechnical engineering investigation, it is more likely that bring huge loss to geotechnical engineering design, construction.
Along with the continuous quickening of city process, the traffic engineering such as subway, railway, highway quickly grows, and China is built and at the High Speed Rail Projects built
Occupy first place in the world in position.Geotechnical engineering investigation more pay close attention to different frequency dynamic load to Technical Characteristics of Mild Clay and pollutant migration problem in soil, especially
In weak soil seepage characteristic problem under dynamic load and centrifugal coupling, the most still use existing constant head darcy flow instrument and varying head darcy flow instrument
To weak soil gas permeability measurement, it is not inconsistent with engineering practice, more how can not migrate in soil by simulating pollution thing, lack corresponding experimental provision.
So people start increasingly to pay close attention to the research to weak soil seepage characteristic, and the achievement in research of theoretical research with engineering experience accumulation is applied to work
In journey practice.
Centrifugal machine model trial by internationally recognized for be research rock-soil dynamics problem scientific experimentation platform most effective, state-of-the-art.U.S. brother in 1931
First rival Asia university develops First radius in the world is the geotechnical centrifuge of 0.25m, at the beginning of 19 century 70s, geotechnical centrifuge beautiful,
English, the Soviet Union, method, Deng state develop in succession, develop turntable type centrifuge, suspended centrifugal and drum centrifuge, and China is in 19th century 80
Age starts to pay attention to power Centrifuge Techniques, and nineteen eighty-two is called for short by the Changjiang river research institute, and maximum centrifugal acceleration reaches 300g, capacity 150g-t
Effective radius 3m.Up to now, China has desk centrifuge more than 20.Test model can reflect condition and the behavior of prototype, mould truely and accurately
Need to meet geometric similarity, kinematic similitude and three primary conditions of dynamic similitude law between type and prototype, i.e. corresponding to each parameter similarity criterion and
Rapport between parameter.Hypothetical model uses leiomyoma cells (comprising pore media etc.), under the conditions of centrifugal acceleration Ng, is centrifuged based on power
Simulation test principle, " similar three theorems " and equilibrium equation, can derive the similar factors of each physical parameter between model and prototype, this experiment instrument
Although device can calculate weak soil infiltration coefficient, but operation is complicated, it is impossible to the oscillatory load size of manual control horizontally and vertically both direction and frequency.
2010, the Multifunction permeameter that Tongji University develops and Darcy's law experimental teaching, can preferably simulate double-deck in nature or multilamellar
Seepage flow in structure water-bearing layer, although this instrument considers different permeating medium, seepage direction, but is not particularly suited for weak soil dynamic coefficient of permeability
Measurement.
2012, American Association of Engineers, have developed centrifugal seepage instrument for unsaturated soil, by simulation NrThe infiltration of unsaturated soil under the conditions of g
Characteristic, pushes away the infiltration coefficient of unsaturated soil under physical condition according to the principle of similitude is counter.Although this instrument can accurately calculate unsaturated soil infiltration coefficient with
And simulating pollution thing migration problem in soil is simulated, but this experimental apparatus can not be simulated under different frequency or combination of frequency dynamic loading
Weak soil infiltration coefficient.
Existing experimental apparatus tends not to manual control difference fixed frequency or combination frequency dynamic load, and weak soil infiltration coefficient is difficult to accurately measure.
Summary of the invention
It is an object of the invention to provide and a kind of can more precisely simulate the saturated soft soil vibration centrifugal of weak soil seepage consolidation characteristic under dynamic loading and ooze
Stream instrument.Technical scheme is as follows:
A kind of saturated soft soil vibration centrifugal seepage instrument, including support 23, vibration platen 18, the first Loading Control platform and the second Loading Control platform, glass
Glass scale rotating cylinder 66, the electric rotating machine 60 being fixed on vibration platen 18 and water filling part.
The side of vibration platen 18 is connected with support 23 by horizontal spring 2, and opposite side passes through the first rigid rod 27 and the first Loading Control platform
Steel column 39 is fixing to be connected, the first Loading Control platform control to do horizontal direction vibration；
The bottom of vibration platen 18 is connected with support 23 by uprighting spring 22, and the second rigidity is passed through by middle position in the bottom of vibration platen 18
Bar 32 is fixing with the steel column 39 of the second Loading Control platform to be connected, the second Loading Control platform control to do vertical direction vibration；
Glass scales rotating cylinder 66 includes with graduated barrel, coaxial big hollow cylinder permeable stone 20 and little hollow cylinder permeable stone 8, its material
Material is pervious concrete；For stretching out the machine shaft 4 of the electric rotating machine 60 bottom cylinder in the middle part of glass scales rotating cylinder 66；Big hollow cylinder permeable stone
Form soil sample groove 9 between inwall and the outer wall of little hollow cylinder permeable stone 8 of 20, post filter paper 6 at soil sample groove 9 inwall, and be placed with saturated soil
Sample；It is referred to as collecting-tank 3 by the cavity formed with graduated barrel and big hollow cylinder permeable stone 20 outer wall；
Water filling part includes cistern 10 and glass scales cylinder 64, the cavity 21 between little hollow cylinder permeable stone 8 and machine shaft 4 be positioned at it
The cistern 10 of lower section is connected, and cistern 10 is connected with glass scales cylinder 64 by water pipe 12, and the position of glass scales cylinder 64 is higher than glass
Scale rotating cylinder 66 so that the water in glass scales cylinder 64 flows into glass rotating scale cylinder 66 smoothly；Machine shaft 4 is driven by electric rotating machine 60
Dynamic, the soil sample of the soil sample groove 9 being rotated in glass scales rotating cylinder 66 does centrifugal motion.
Preferably, described saturated soft soil vibration centrifugal seepage instrument, the structure of two Loading Control platforms is identical, including first piston cylinder
36, first piston the 35, second piston cylinder the 37, second piston 38, sink box 42, steel column 39, displacement transducer, computer；
The bottom of first piston cylinder 36 connects the first pipeline and the second pipeline, and the first pipeline reaches in the water in sink box 42, the second pipeline and the
The bottom of two piston cylinders 37 is connected, and is respectively arranged with the first check valve 40 and the second check valve 41 at the first pipeline and the second pipeline；
Second piston cylinder 37 is by connecting with the aqueous phase in sink box 42 with the 3rd pipeline of regulation valve 24；
The second piston 38 in second piston cylinder 37 is fixing with steel column 39 to be connected, and by the displacement of displacement sensor steel column 39, displacement measurement is tied
Fruit is admitted to computer, computer show the motion conditions of steel column 39 on screen；
Master controller drives the reciprocating motion of first piston 35 in first piston cylinder 36 by converter 25 and piston motor 11；
When first piston 35 moves upward, under pressure, the water in sink box 42 is by the first check valve 40 in the first pipeline upwards
Motion, enters into first piston cylinder 36；When first piston 35 moves downward, the water in first piston cylinder 36 is unidirectional by second in the second pipeline
Valve 41 enters into the second piston cylinder 37, promotes the second piston 38 and moves upward；When the water in first piston cylinder 36 is all pressed into the second piston cylinder
When 37, regulate valve 24 beginning degree by main controller controls, control the water consumption of water release in the second piston cylinder 37, reach the control to steel column 39
System, makes steel column 39 move downward according to certain velocity magnitude.
Due to the fact that the above technical scheme of employing has the advantage that 1, the present invention is with saturated soft soil as object of study, it is possible to truly simulate live load
Under load effect, the seepage consolidation characteristic of weak soil, the infiltration coefficient calculated and land movement value are more authentic and valid；2, the present invention relates to a kind of closing
Seepage apparatus, by water yield parameter, Δ Q and time Δ t and two number of degrees h of glass scales cylinder1、h2, just can determine that the loss of flood peak and infiltration
Coefficient, parameter is few, convenient；3, vibration table and centrifuge are combined by the present invention, it is possible to consider that vibration and centrifugal coupling effect are to saturated soft
The impact of soil Penetration Signature, vibration table is connected with tension and compression loader, spring, simple.In a word, the structure of the present invention arranges simple, conveniently；
Measure saturated soft soil infiltration coefficient more accurate, be closer to truth.
Accompanying drawing explanation
Fig. 1 is saturated soft soil vibration centrifugal seepage instrument vibration platen connection figure；
Fig. 2 is that saturated soft soil vibration centrifugal seepage instrument first, second vibrates tension and compression Loading Control schematic diagram；
Fig. 3 is saturated soft soil vibration centrifugal seepage instrument seepage flow connection figure
Fig. 4 is saturated soft soil vibration centrifugal seepage calculation schematic diagram；
In figure 1, drive rod；2, the first spring；3, collecting-tank；4, machine shaft；5, relief valve；6, filter paper；8, little hollow cylinder is saturating
Water stone；9, soil sample groove；10, tank；11, piston motor；12, water pipe；17, rotary electromechanical switches；18, vibration platen；20, big
Hollow cylinder permeable stone；21, cavity；22, the second spring；23, support；24, regulation valve；25, converter；27, the first rigid rod；32、
Second rigid rod；35, first piston；36, first piston cylinder；37, the second piston cylinder；38, the second piston；39, steel column；40, first is single
To valve；41, the second check valve；42, sink box；60, electric rotating machine；61, rotary barrel base；64, glass scales cylinder；66, glass
Scale rotating cylinder.
Detailed description of the invention
For further appreciating that the summary of the invention of the present invention, feature and effect, now enumerate following example, and it be as follows to coordinate accompanying drawing to describe in detail:
Saturated soft soil Centrifugal vibration seepage instrument in the saturated soft soil vibration centrifugal seepage instrument of the present invention includes vibration platen 18, glass scales rotating cylinder
66, electric rotating machine 60 and water filling part.
In FIG, the side of vibration platen 18 is connected with support 23 by horizontal spring 2, and opposite side is added with first by the first rigid rod 27
Carry the fixing connection of steel column 39 of control station 19, the first Loading Control platform 19 control to do horizontal direction vibration；The bottom of vibration platen 18 is by perpendicular
Straight spring 22 is connected with support, and the middle part of vibration platen 18 is connected by the second rigid rod 32 is fixing with the steel column 39 of the second Loading Control platform 43,
Controlled to do vertical direction vibration by the second Loading Control platform 43；Vibration platen 18 is fixed with electric rotating machine 60,
In fig. 2, the structure of two Loading Control platforms is identical, including drive rod 1, and converter 25, piston motor 11, first piston cylinder 36,
First piston 35, the first check valve 40, sink box 42, the second check valve 41, the second piston cylinder 37, the second piston 38, steel column 39, regulation
Valve 24.Operation principle: open alternating current steady voltage plug, by main controller controls converter 25, thus change the rotary speed of piston motor 11,
The drive rod 1 being connected with piston motor 11 is to drive the reciprocating motion of first piston 35 in first piston cylinder 36；When first piston 35 moves upward
Time, and under pressure, the water in sink box 42 is moved upward by the first check valve 40 in the first pipeline, enters into first piston cylinder 36；
When first piston 35 moves downward, the water in first piston cylinder 36 enters into the second piston cylinder 37 by the second check valve 41 in the second pipeline,
And promote the second piston 38, and steel column 39 is driven to move upward.When the water in first piston cylinder 36 is all pressed into the second piston cylinder 37, logical
Cross main controller controls regulation valve 24 beginning degree, control the water consumption of water release in the second piston cylinder 37, reach the control to steel column 39, make steel
Post 39 moves downward according to certain speed；Displacement transducer is connected with steel column 39, when, in steel column 39 motor process, displacement transducer is by steel column
39 move back and forth signal is input in computer.In a computer, can observe whether steel column 39 enters according to sinusoidal wave, rectangular wave and triangular wave
Row motion.The structure of two Loading Control platforms is identical, and steel column 39 is right with vibration platen 18 by the first rigid rod 27 and the second rigid rod 32 respectively
Side and beneath rigidly connected, thus realize horizontally and vertically tension and compression vibration.
In figure 3, glass scales rotating cylinder 66 includes with graduated barrel, coaxial big hollow cylinder permeable stone 20 and little hollow cylinder permeable
Stone 8, its material is pervious concrete；For to stretch out the machine shaft 4 bottom cylinder in the middle part of glass scales rotating cylinder 66；At big hollow cylinder permeable stone 20
And be placed with saturated soil sample between little hollow cylinder permeable stone 8, and stick filter paper 6 at the internal diameter and external diameter surface of soil sample.
Water filling part mainly includes tank 10 and glass scales cylinder 64.Cavity between little hollow cylinder permeable stone 8 and machine shaft 4
21 are connected with glass scales cylinder 64 by water pipe 12, tank 10, and the position of glass scales cylinder 64 is higher than glass scales rotating cylinder 66 so that glass
Water in glass dial drum 64 flows into glass rotating scale cylinder 66 smoothly；Machine shaft 4 is driven rotary glass scale to rotate by the driving of electric rotating machine 60
The soil sample of the soil sample groove 9 in cylinder 66 does centrifugal motion.
In the diagram, saturated soft soil vibration centrifugal seepage instrument infiltration coefficient of the present invention calculates, and obtains following two public affairs according to collecting-tank water yield and time
Formula, one: only open Loading Control platform, close motor Rotation Controllers, have
Its two, open motor Rotation Controllers, close or open Loading Control platform, have
Wherein a=w2R=Nrg
Δ Q water yield (L)；
Δ t Seepage flow time；
λ weak soil seepage flow correction factor；
The angular velocity that w electric rotating machine 60 rotates；
G acceleration of gravity；
riThe centrage of machine shaft 4 is to the distance of little hollow cylinder permeable stone 8；
r0The centrage of machine shaft 4 is to the distance of big hollow cylinder permeable stone 20；
R is the centrage distance to glass scales rotating cylinder 66 of machine shaft 4；
NrLikeness coefficient；
PwBy the pressure differential after soil sample.Pw=ρwgΔh；
ρwThe density of water；
The Δ h loss of flood peak, i.e. glass scales cylinder numerical difference Δ h=h when on-test and off-test1-h2；
Now under simulation dynamic load and centrifugal coupling as a example by the test of saturated soft soil infiltration coefficient, the specifically used process of the present invention is described, specifically
Implement step as follows:
(1), after pilot system assembles according to accompanying drawing, first will put into the filter paper 6 of dipped water inside soil sample groove 9, and check that little hollow cylinder is saturating
Whether water stone 8 and big hollow cylinder permeable stone 20 block, and the most again saturated soft soil sample are put into soil sample groove 9；
(2) glass scales cylinder 64 is placed on the position higher than rotating scale cylinder 66, cavity 21 is filled water, read the number of glass scales cylinder 64
Value h1；
(3) open vibration table 18, selected the waveform of corresponding frequencies by master console, and control horizontal direction by the first Loading Control platform
Vibration or the second Loading Control platform control vertical displacement, regulate two Loading Control platform vibrations according to the motion conditions of the steel column 39 of computer acquisition
Frequency.
(4) open rotary electromechanical switches 17, determine rotary speed ω by electric rotating machine；
(5) determine infiltration time Δ t, and record glass scales rotating cylinder 66 water yield Δ Q-value, again read off the numerical value h of glass scales2；
(6) by above-mentioned formula calculation permeability coefficient, test is terminated.
Although a certain embodiment of the present invention being described above in conjunction with accompanying drawing, but the present invention being not limited to above-mentioned specific embodiment party
Formula, above-mentioned detailed description of the invention is only schematically, is not circumscribed, those of ordinary skill in the art under the enlightenment of the present invention,
In the case of without departing from present inventive concept and scope of the claimed protection, it is also possible to make a lot of form, these belong to the protection model of the present invention
Within enclosing.
Claims (2)
1. a saturated soft soil vibration centrifugal seepage instrument, including support (23), vibration platen (18), the first Loading Control platform and second loads control
Platform processed, glass scales rotating cylinder (66), the electric rotating machine (60) being fixed on vibration platen (18) and water filling part；
The side of vibration platen (18) is connected with support (23) by horizontal spring (2), and opposite side passes through the first rigid rod (27) and first
The steel column (39) of Loading Control platform is fixing to be connected, the first Loading Control platform control to do horizontal direction vibration；
The bottom of vibration platen (18) is connected with support (23) by uprighting spring (22), and the bottom of vibration platen (18) is by middle position
It is connected by the second rigid rod (32) is fixing with the steel column (39) of the second Loading Control platform, the second Loading Control platform controls to do vertical direction vibration；
Glass scales rotating cylinder (66) includes with graduated barrel, coaxial big hollow cylinder permeable stone (20) and little hollow cylinder permeable stone (8),
Its material is pervious concrete；Glass scales rotating cylinder (66) middle part is the machine shaft (4) stretching out the electric rotating machine (60) bottom cylinder；Big empty
Form soil sample groove (9) between inwall and the outer wall of little hollow cylinder permeable stone (8) of heart cylinder permeable stone (20), paste at soil sample groove (9) inwall
There is filter paper (6), and be placed with saturated soil sample；It is referred to as collection by the cavity formed with graduated barrel and big hollow cylinder permeable stone (20) outer wall
Pond (3)；
Water filling part includes cistern (10) and glass scales cylinder (64), the sky between little hollow cylinder permeable stone (8) and machine shaft (4)
Chamber (21) is connected with the cistern (10) being disposed below, and cistern (10) is connected with glass scales cylinder (64) by water pipe (12),
The position of glass scales cylinder (64) is higher than glass scales rotating cylinder (66) so that the water in glass scales cylinder (64) flows into glass smoothly and rotates quarter
Degree cylinder (66)；Machine shaft (4) is by the driving of electric rotating machine (60), the soil sample groove (9) being rotated in glass scales rotating cylinder (66)
Soil sample do centrifugal motion.
Saturated soft soil vibration centrifugal seepage instrument the most according to claim 1, it is characterised in that the structure of two Loading Control platforms is identical, bag
Include first piston cylinder (36), first piston (35), the second piston cylinder (37), the second piston (38), sink box (42), steel column (39), position
Displacement sensor, computer,
The bottom of first piston cylinder (36) connects the first pipeline and the second pipeline, and the first pipeline reaches in the water in sink box (42), the second pipe
Road is connected with the bottom of the second piston cylinder (37), is respectively arranged with the first check valve (40) and the second check valve (41) at the first pipeline and the second pipeline；
Second piston cylinder (37) is by connecting with the aqueous phase in sink box (42) with the 3rd pipeline of regulation valve (24)；
The second piston (38) in second piston cylinder (37) is fixing with steel column (39) to be connected, by the displacement of displacement sensor steel column (39),
Displacement measurement is admitted to computer, computer show the motion conditions of steel column (39) on screen；
Master controller drives the reciprocating motion of first piston (35) in first piston cylinder (36) by converter (25) and piston motor (11)；
When first piston (35) moves upward, under pressure, the water in sink box (42) is by the first check valve (40) in the first pipeline
Move upward, enter into first piston cylinder (36)；When first piston (35) moves downward, the water in first piston cylinder (36) is by the second pipe
The second check valve (41) in road enters into the second piston cylinder (37), promotes the second piston (38) and moves upward；When first piston cylinder (36)
In water when being all pressed into the second piston cylinder (37), regulate valve (24) beginning degree by main controller controls, control the second piston cylinder (37)
The water consumption of middle water release, reaches the control to steel column (39), makes steel column (39) move downward according to certain velocity magnitude.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610526245.7A CN106013034B (en) | 2016-07-06 | 2016-07-06 | Saturated soft soil vibration centrifugal seepage instrument |
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| CN201610526245.7A CN106013034B (en) | 2016-07-06 | 2016-07-06 | Saturated soft soil vibration centrifugal seepage instrument |
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| CN106013034B CN106013034B (en) | 2018-03-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596501A (en) * | 2019-01-29 | 2019-04-09 | 辽宁工程技术大学 | Top board seepage experimental rig and method under the influence of a kind of dynamic load |
| CN113155681A (en) * | 2021-05-13 | 2021-07-23 | 西安石油大学 | Device for simulating action of seepage force on rock by using centrifugal force and experimental method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596501A (en) * | 2019-01-29 | 2019-04-09 | 辽宁工程技术大学 | Top board seepage experimental rig and method under the influence of a kind of dynamic load |
| CN109596501B (en) * | 2019-01-29 | 2023-08-22 | 辽宁工程技术大学 | Roof seepage test device and method under influence of dynamic load |
| CN113155681A (en) * | 2021-05-13 | 2021-07-23 | 西安石油大学 | Device for simulating action of seepage force on rock by using centrifugal force and experimental method |
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| CN106013034B (en) | 2018-03-23 |
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