CN109752304A - A kind of varying head soil permeability coefficient measurement device - Google Patents
A kind of varying head soil permeability coefficient measurement device Download PDFInfo
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- CN109752304A CN109752304A CN201910145629.8A CN201910145629A CN109752304A CN 109752304 A CN109752304 A CN 109752304A CN 201910145629 A CN201910145629 A CN 201910145629A CN 109752304 A CN109752304 A CN 109752304A
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Abstract
The present invention provides a kind of varying head soil permeability coefficient measurement device, including test bracket, sealing cover, test cylinder, hole pattern, sink and varying head pipe, the soil body to be measured is placed in test cylinder, test cylinder is placed on test bracket, sealing cover, test cylinder, hole pattern and sink are sequentially connected from top to bottom, test cylinder includes the test cylinder top and test cylinder lower part being threadedly coupled, the upper and lower side of test cylinder top and test cylinder lower part is open, several spillway holes equidistantly arranged are opened up on the barrel on test cylinder top, varying head pipe is connected at spillway hole vertically, the upper end of hole pattern is open, the lower end closed of hole pattern and offer several apertures, permeable stone is placed in hole pattern, the upper end of sink is open, the lower end closed of sink, the water injected in varying head pipe flows into test cylinder from spillway hole, it then passes through the soil body to be measured and generates infiltration, sink is flowed into again It is interior to be flowed out by sink, the infiltration coefficient of the soil body to be measured is calculated according to the water variation in varying head pipe.
Description
Technical field
The present invention relates to soil test technique field more particularly to a kind of varying head soil permeability coefficient measurement devices.
Background technique
Infiltration coefficient is the quantitative target for characterizing soil permeability power, and carries out one must used when seepage calculation
Basic parameter, soil improvement processing, it is all kinds of in terms of play an important role.Lysimeter is divided into often at present
Head and two kinds of varying head, constant head test are suitable for measure the infiltration coefficient of the biggish sandy soil of water penetration, and varying head is tested
Suitable for measuring the infiltration coefficient of the lesser cohesive soil of water penetration.Either hydrostatic head method or variable water level method are all in laboratory
Interior measurement, in cutting ring cylinder sample transportational process, certain influence can be generated on native water content, quality and structure, to lead
Cause biggish error.The infiltration coefficient numerical value itself that traditional live wellhole is drawn water or although the test method of hole well water filling is measured
It is more reliable, but destruction is produced to the surface layer soil body, the soil permeability coefficient containing topsoil can not be accurately measured, and
Higher cost, time are longer.Thus, if there is that infiltration cylinder can be used at point in situ under conditions of reducing soil disturbance
The experimental rig for measuring soil body osmotic coefficient, will increase soil body osmotic coefficient accuracy rate while reduce transportation cost and
Agitation error.
Summary of the invention
In view of this, the present invention provides a kind of structures, varying head soil that is simple, can effectively reducing agitation error seeps
Saturating factor detection device.
The present invention provides a kind of varying head soil permeability coefficient measurement device, including test bracket, sealing cover, test cylinder,
Hole pattern, sink and varying head pipe, the test cylinder is interior to place the soil body to be measured, and the test cylinder is placed on test bracket, described
Sealing cover, test cylinder, hole pattern and sink are sequentially connected from top to bottom, the test cylinder include be threadedly coupled test cylinder top and
The upper and lower side of test cylinder lower part, the test cylinder top and test cylinder lower part is open, opens on the barrel on the test cylinder top
If several spillway holes equidistantly arranged, the varying head pipe is connected at spillway hole vertically, and the upper end of the hole pattern is open, institute
It states the lower end closed of hole pattern and offers several apertures, permeable stone is placed in the hole pattern, the upper end of the sink is open, described
The lower end closed of sink, the water injected in varying head pipe flow into test cylinder from spillway hole, then pass through the soil body to be measured and generate infiltration,
It flows into sink and is flowed out by sink again, the infiltration coefficient of the soil body to be measured is calculated according to the water variation in varying head pipe.
Further, the varying head soil permeability coefficient measurement device further includes screwing bowl cover, described to screw bowl cover packet
It includes lid and screws bar, the lower end of the lid and the threaded upper ends on test cylinder top cooperate, and the lid is equipped with cross
Hole post, the cross hole post are equipped with vertical holes, and the bar that screws includes screwing bar straight-bar and screwing bar chassis, described to screw
Bar straight-bar passes through vertical holes and is threadedly engaged with vertical holes, and the bottom end for screwing bar straight-bar is spheroform surface, close to screw bar
The bottom end of straight-bar is equipped with and the first annulus for screwing bar straight-bar and being fixedly connected, second circle of top connection for screwing bar chassis
Ring, the bottom end for screwing bar straight-bar pass through the second annulus, the internal diameter of second annulus be greater than the diameter for screwing bar straight-bar and
Less than the outer diameter of the first annulus.
Further, the calculation formula of the infiltration coefficient of the soil body to be measured are as follows:
kT=2.3a (L2-L1)/(A(t2-t1))*log(H1/H2)
In formula, kTFor the infiltration coefficient of the soil body to be measured；A is the interior basal area of varying head pipe；A is the interior section of test cylinder
Product；L1For screw bar chassis it is concordant with the lower port of test cylinder lower part when, screw the length that bar straight-bar is located at outside test cylinder；L2For
It screws bar chassis and when soil body top just contacts, screws the length that bar straight-bar is located at outside test cylinder；t1To test initial time；
t2For the off-test moment；H1The scale of water when for on-test in varying head pipe；H2When for off-test in varying head pipe
The scale of water.
Further, the varying head soil permeability coefficient measurement device further includes auxiliary soil sample barrel, and the auxiliary takes soil
The upper and lower side of cylinder is open, and the internal diameter of the auxiliary soil sample barrel is consistent with the internal diameter on test cylinder top, under the auxiliary soil sample barrel
The threaded upper ends at end and test cylinder top cooperate.
Further, the varying head soil permeability coefficient measurement device further includes cutting ring cylinder, above and below the cutting ring cylinder
End is open, and the internal diameter of the cutting ring cylinder is consistent with the internal diameter of test cylinder lower part, upper end and the test cylinder lower part of the cutting ring cylinder
The lower end of lower thread cooperation, the cutting ring cylinder is equipped with blade.
Further, the test bracket includes test bracket cylinder and three test bracket supporting legs, the test bracket
Supporting leg and test bracket cylinder are hinged, and the upper and lower side of the test bracket cylinder is open, and the upper end of the test bracket cylinder is opened
Equipped with the first notch and the second notch, the barrel of the test cylinder lower part rides equipped with first and second is foot-operated, and described first
Foot-operated shape and the shape of the first notch match, and the shape of the described second foot-operated shape and the second notch matches, institute
State first it is foot-operated be stuck on the first notch, described second foot-operated is stuck on the second notch.
Further, the sealing cover includes sealing cover top and sealing cover lower part, the sealing upper part of the cover lower end with
The threaded upper ends on test cylinder top cooperate, and the outer diameter of the sealing cover lower part is consistent with the internal diameter on test cylinder top, the sealing
Lid is sealed test cylinder top.
Further, sink outlet is opened up on the side wall of the sink, the sink outlet connects the first rubber tube.
Further, the varying head soil permeability coefficient measurement device further includes hitting real support, described to hit real support packet
Bottom plate and two vertical bars are included, two vertical bars, which are respectively fixedly connected on the top of bottom plate, every vertical bar, is respectively provided with one
Horizontal pin hole, the horizontal pin hole interpolation enter support pin, lateral aperture, the level are additionally provided in the cross hole post
Hole and support pin thread cooperate.
Further, second annulus with screw bar chassis and connect by three circle ring racks, the circle ring rack
One end, which is connected to, to screw on bar chassis, and the other end of the circle ring rack is connect with the second annulus.
Technical solution provided by the invention has the benefit that
1, varying head soil permeability coefficient measurement device provided by the invention can be placed with well adapting to property to landform,
Test operation can be carried out in uneven landform, overcome existing most of measurement infiltration coefficient device to placement site requirements
Higher problem；
2, the present invention is matched by that will screw bowl cover, test cylinder, hole pattern, sink, sealing cover and varying head pipe, Neng Gou
The infiltration coefficient that the soil body is measured under conditions of destroying to soil disturbance and to topsoil and soil cover is effectively avoided, thus
Make the result of surveyed infiltration coefficient closer to the true value of soil as former state；
3, the present invention sets the laboratory proportion soil that can be measured relatively simplely under certain porosity requirement by hitting actual load
Infiltration coefficient；
4, the present invention in the case where being changed without the soil body, can change the water level of varying head pipe and test to carry out multiple groups to mention
The accuracy of high result.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of varying head soil permeability coefficient measurement device of the present invention.
Fig. 2 is that the connection of a kind of test cylinder of varying head soil permeability coefficient measurement device of the present invention, hole pattern and sink is shown
It is intended to.
Fig. 3 is a kind of structural schematic diagram of the sealing cover of varying head soil permeability coefficient measurement device of the present invention.
Fig. 4 is a kind of hole pattern of varying head soil permeability coefficient measurement device of the present invention and the structural representation of test cylinder cooperation
Figure.
Fig. 5 is a kind of auxiliary soil sample barrel of varying head soil permeability coefficient measurement device of the present invention, test cylinder and cutting ring cylinder
The structural schematic diagram of cooperation.
Fig. 6 is a kind of auxiliary soil sample barrel of varying head soil permeability coefficient measurement device of the present invention, test cylinder and cutting ring cylinder
The decomposition diagram of cooperation.
Fig. 7 is a kind of structural schematic diagram for hitting real support of varying head soil permeability coefficient measurement device of the present invention.
Fig. 8 is a kind of structural schematic diagram for screwing bowl cover of varying head soil permeability coefficient measurement device of the present invention.
Fig. 9 is a kind of enlarged diagram for screwing bar chassis of varying head soil permeability coefficient measurement device of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is further described.
Fig. 1 to Fig. 9 is please referred to, the embodiment provides a kind of varying head soil permeability coefficient measurement device, packets
It includes test bracket 1, sealing cover 2, test cylinder 3, hole pattern 4, sink 5, varying head pipe 6, auxiliary soil sample barrel 7, cutting ring cylinder 8, screw bar
Lid 9 and real support 10 is hit, sealing cover 2, test cylinder 3, hole pattern 4 and sink 5 are successively threadedly coupled from top to bottom, and test cylinder 3 is placed
On test bracket 1.
Test bracket 1 includes test bracket cylinder 11 and three test bracket supporting legs 12, on three test bracket supporting legs 12
It is provided with supporting leg pin 121, by the length of the adjustable test bracket supporting leg 12 of supporting leg pin 121, and three tests are propped up
Frame supporting leg 12 is hinged with test bracket cylinder 11 respectively, and the upper and lower side of test bracket cylinder 11 is open, test bracket cylinder 11
Upper end offers the first notch 111 and the second notch 112, and the first notch 111 and the second notch 112 are about test bracket cylinder 11
Central symmetry, the barrel of test bracket cylinder 11 is equipped with the level meter 113 containing level(l)ing bubble, and level meter 113 is used to measure
Whether test bracket cylinder 11 is horizontal.
The soil body is placed in test cylinder 3, test cylinder 3 includes the test cylinder top 31 and test cylinder lower part 32 being threadedly coupled, examination
Test that top 31 is consistent with the size of test cylinder lower part 32, the upper and lower side of test cylinder top 31 and test cylinder lower part 32 is open,
Four spillway holes equidistantly arranged 311 are opened up on the barrel on test cylinder top 31, are equipped with spilling water port lid 312 at spillway hole 311,
There is the protrusion cylinder of metal material at the middle part of spilling water port lid 312, and the outer diameter of the protrusion cylinder is identical as the internal diameter of spillway hole 311,
Spillway hole 311 is sealed by the way that the protrusion cylinder of spilling water port lid 312 to be placed into spillway hole 311, when carrying out varying head test,
Varying head pipe 6 is connected at selected spillway hole 311, and varying head pipe 6 is made to keep vertical；It is set on the barrel of test cylinder lower part 32
There is the first foot-operated 321 and second foot-operated 322 of triangular shape, first foot-operated 321 and second foot-operated 322 about test cylinder lower part 32
Central symmetry, first foot-operated 321 shape and the shape of the first notch 111 on test bracket cylinder 11 match, crus secunda
It steps on 322 shape and the shape of the second notch 112 on test bracket cylinder 11 matches, by being stuck in first foot-operated 321
First notch 111, second foot-operated 322, which is stuck on the second notch 112, is fastened on test cylinder 3 on test bracket cylinder 11, tests
The outer diameter of cylinder lower part 32 is identical as the internal diameter of test bracket cylinder 11.
With reference to Fig. 3, sealing cover 2 includes the sealing cover top 21 and sealing cover lower part 22 of integrally connected, sealing cover top 21
Upper end closed, the threaded upper ends on the lower end on sealing cover top 21 and test cylinder top 31 cooperate, the outer diameter of sealing cover lower part 22
Consistent with the internal diameter on test cylinder top 31, sealing cover 2 is sealed test cylinder top 31, and sealing cover lower part 22 is foam
Column structure.
With reference to Fig. 4, the upper end of hole pattern 4 is open, the lower end closed of hole pattern 4 and offers several aperture (not shown), hole
Columned permeable stone 41 is placed in net 4, the diameter of permeable stone 41 is consistent with the internal diameter of test cylinder lower part 32, and hole pattern 4 is cylinder
Structure, internal diameter, the wall thickness of hole pattern 4 are consistent with the internal diameter of test cylinder lower part 32, wall thickness, the upper end and test cylinder lower part 32 of hole pattern 4
Lower thread cooperation.
The upper end of sink 5 is open, the lower end closed of sink 5, and sink 5 is tube structure, internal diameter, wall thickness and the hole of sink 5
Internal diameter, the wall thickness of net 4 are consistent, and the upper end of sink 5 and the lower thread of hole pattern 4 cooperate, and sink water outlet is opened up on the side wall of sink 5
Mouth 51, sink outlet 51 connect the first rubber tube 52, and the first rubber tube 52 is equipped with the first tongs 53.
With reference to Fig. 5 and Fig. 6, assist the internal diameter of soil sample barrel 7 consistent with the internal diameter on test cylinder top 31, auxiliary soil sample barrel 7
Length is bigger than the length of test cylinder 3, assists the upper and lower side of soil sample barrel 7 open, assists setting that there are two be located on the barrel of soil sample barrel 7
The threaded upper ends of the handle 71 of barrel diameter line two sides, the lower end and test cylinder top 31 that assist soil sample barrel 7 cooperate.
With reference to Fig. 5 and Fig. 6, cutting ring cylinder 8 is tube structure, and the upper and lower side of cutting ring cylinder 8 is open, internal diameter, the wall thickness of cutting ring cylinder 8
Consistent with the internal diameter of test cylinder lower part 32, wall thickness, the upper end of cutting ring cylinder 8 and the lower thread of test cylinder lower part 32 cooperate, cutting ring
The lower end of cylinder 8 is equipped with blade, and 8 stress rear knife edge of cutting ring cylinder contacts cutting soil with soil, and the soil cut is retained in test
In cylinder lower part 32.
With reference to Fig. 8 and Fig. 9, bowl cover 9 is screwed including lid 91 and screws bar 92, the lower end and test cylinder top 31 of lid 91
Threaded upper ends cooperation, the center opening of lid 91, lid 91 is equipped with cross hole post 911, and cross hole post 911 is equipped with
The vertical holes 912 and lateral aperture 913 of connection, vertical holes 912 are connected to the center of lid 91, and screwing bar 92 includes screwing bar straight-bar
921 and screw bar chassis 922, the upper end for screwing bar straight-bar 921, which is equipped with, screws bar knob 923, screw bar straight-bar 921 pass through it is vertical
It hole 912 and the center of lid 91 and is threadedly engaged with vertical holes 912, by being threadedly engaged so that screwing bar straight-bar 921 in cross
It is moved up and down in shape hole post 911, the bottom end for screwing bar straight-bar 921 is spheroform surface, is set close to the bottom end for screwing bar straight-bar 921
There is and screw the first annulus 924 of 921 integrally connected of bar straight-bar, the surface for screwing bar chassis 922 connects the second annulus 925,
Second annulus 925 is located at the top of the first annulus 924, and the bottom end for screwing bar straight-bar 921 passes through the second annulus 925, the second annulus
925 internal diameter enables slightly larger than the diameter of bar straight-bar 921 is screwed and less than the outer diameter of the first annulus 924 and screws bar straight-bar 921
It is enough opposite to screw the rotation of bar chassis 922, and it is opposite in a certain range screw the up and down motion of bar chassis 922, screw bar straight-bar 921
It is limited when being moved upward to extreme higher position by the second annulus 925, screws when bar straight-bar 921 is moved downward to extreme lower position and be screwed
Bar chassis 922 limit, the second annulus 925 with screw bar chassis 922 pass through three circle ring racks 926 connect, circle ring rack 926
One end is integrally attached to screw on bar chassis 922,925 integrally connected of the other end of circle ring rack 926 and the second annulus, three circles
The point centered on the center of circle for screwing bar chassis 922 of ring support 926.
With reference to Fig. 7, hitting real support 10 includes bottom plate 101 and two vertical bars 102, and two vertical bars 102 are fixed respectively to be connected
It connects and is respectively provided with a horizontal pin hole 103 on the top of bottom plate 101, every vertical bar 102, insertion in horizontal pin hole 103
Support pin 104, support pin 104 and the lateral aperture 913 of cross hole post 911 are threadedly engaged.
In order to guarantee the leakproofness of varying head soil permeability coefficient measurement device, rubber is equipped at the position of threaded connection
Rubber case 313 is respectively provided at apron, sink outlet 51 and spillway hole 311.
When carrying out cohesive soil varying head test in situ using varying head soil permeability coefficient measurement device provided by the invention,
Step are as follows:
Step S101, from top to bottom successively by auxiliary soil sample barrel 7, test cylinder top 31, test cylinder lower part 32 and cutting ring cylinder 8
Group is combined into drawing out soil equipment；
The assembled drawing out soil equipment of step S101 is inserted into the soil body to be measured by step S102, and insertion certain depth makes ring
Soil body thickness more than the upper end mouth line of knife cylinder 8 is about institute's soil body thickness to be tested, and drawing out soil equipment is inserted into soil body mistake to be measured
Cheng Zhong, while trampling first foot-operated 321 and second foot-operated 322 or being put on first foot-operated 321 and second foot-operated 322 equal
The weight of weight keeps the first foot-operated 321 and second foot-operated 322 stress equal, the integrality of sampling can be effectively ensured, effectively protect
The structure and composition of original sample are stayed；Soil body thickness more than the upper end mouth line of cutting ring cylinder 8 is about that institute's soil body to be tested is thick
When spending, stops trampling first foot-operated 321 and second foot-operated 322 or unload the weight on first foot-operated 321 and second foot-operated 322
Object, while minimizing the rotation of test cylinder 3；
Step S103 removes auxiliary soil sample barrel 7, loads on test cylinder top 31 and screw bowl cover 9, by screwing bar knob
923, which screw bar straight-bar 921, to screw bar chassis 922 and just contacts with soil body top, and measurement obtains screwing bar straight-bar 921
Length outside test cylinder 3, is denoted as L2；
Step S104 excavates the soil body around drawing out soil equipment, with an iron plate or cuts the soil of 8 lower section of native piece cutting cutting ring cylinder
Body, and iron plate is lived with hand rest and cutting ring cylinder 8 is reversed slowly together to level；
Step S105 removes cutting ring cylinder 8, is parallel to the lower port cutting soil of test cylinder lower part 32, so that section and examination
The lower port for testing a lower part 32 is concordant, and the hole pattern 4 of permeable stone 41 is then packed into connection；
Step S106, levels test bracket 1 using level meter 113, and the test cylinder 3 equipped with the soil body is placed on test bracket
On 1, and sink 5 is connected to the lower end of hole pattern 4；
Step S107 is removed and is screwed bowl cover 9, if the taken soil body is not covered with a layer substance, spreads gravel on soil body surface layer
Layer；
Sealing cover 2 is covered the spilling water port lid removed at the spillway hole 311 of bottom on test cylinder top 31 by step S108
312, the rubber case 313 of varying head pipe 6 is connected at the spillway hole 311 of bottom, and keep varying head pipe 6 vertical；
Step S109 is sealed using spilling water port lid 312 at other spillway holes 311, and first is connected at sink outlet 51
Rubber tube 52；
Step S110 is filled to certain altitude into varying head pipe 6, and the bubble in varying head pipe 6 is discharged, and opens first and stops
Water folder 53, is tested；
Step S111 measures initial time t1When varying head pipe 6 scale H1And the t after a period of time2The change water at moment
The scale H of head tube 62And the water temperature T at sink outlet 51；
Step S112, calculation permeability coefficient kT, osmotic coefficient kTCalculation formula are as follows:
kT=2.3a (L2-L1)/(A(t2-t1))*log(H1/H2)
In formula, a is the interior basal area of varying head pipe 6；A is the interior basal area of test cylinder 3, L1For screw bar chassis 922 with
When the lower port of test cylinder lower part 32 is concordant, the length that bar straight-bar 921 is located at outside test cylinder 3 is screwed；
Step S113 changes the water injection rate of varying head pipe 6, repeats more (generally 5-6 of step S110-S112
It is secondary), when the infiltration coefficient difference repeatedly measured is in allowable range of error, terminate test.
The change water of laboratory proportion cohesive soil is carried out using varying head soil permeability coefficient measurement device provided by the invention
When head test, step are as follows:
Step S201 is sequentially connected test cylinder top 31, test cylinder lower part 32 and hole pattern 4 from top to bottom；
Step S202 calculates the volume when soil body of loading is pressed into required void ratio, and is converted into the soil body in test cylinder 3
Height；
Step S203 is packed into the quantitative soil body prepared into test cylinder 3, covers and screws bowl cover 9, and will screw bowl cover 9 with
Real support 10 is hit to connect；
Step S204 screws bar straight-bar 921, is obtained by measuring 921 length of bar straight-bar that screws being located at outside lid 91
Soil body height is obtained, extrusion soil to computed altitude, placing certain time makes highly stable, measurement screwing outside test cylinder 3
921 length of bar straight-bar, is denoted as L2；
Step S205 removes test cylinder 3 from hitting on real support 10, and removes and screw bowl cover 9, then places test cylinder 3
On the test bracket 1 of leveling, sink 5 is connected, then carries out test and infiltration coefficient according to step S108- step S113
It calculates.
Herein, the nouns of locality such as related front, rear, top, and bottom are to be located in figure with components in attached drawing and zero
Part mutual position defines, only for the purpose of expressing the technical solution clearly and conveniently.It should be appreciated that the noun of locality
Use should not limit the claimed range of the application.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of varying head soil permeability coefficient measurement device, which is characterized in that including test bracket, sealing cover, test cylinder, hole
Net, sink and varying head pipe, the test cylinder is interior to place the soil body to be measured, and the test cylinder is placed on test bracket, described close
Capping, test cylinder, hole pattern and sink are sequentially connected from top to bottom, and the test cylinder includes the test cylinder top being threadedly coupled and examination
Test a lower part, the upper and lower side of the test cylinder top and test cylinder lower part is open, opens up on the barrel on the test cylinder top
Several spillway holes equidistantly arranged, the varying head pipe are connected at spillway hole vertically, and the upper end of the hole pattern is open, described
The lower end closed of hole pattern and several apertures are offered, permeable stone is placed in the hole pattern, the upper end of the sink is open, the water
The lower end closed of slot, the water injected in varying head pipe flow into test cylinder from spillway hole, then pass through the soil body to be measured and generate infiltration, then
It flows into sink and is flowed out by sink, the infiltration coefficient of the soil body to be measured is calculated according to the water variation in varying head pipe.
2. varying head soil permeability coefficient measurement device according to claim 1, which is characterized in that the varying head soil
Osmotic coefficient investigating device further includes screwing bowl cover, and the bowl cover that screws includes lid and screws bar, the lower end of the lid with
The threaded upper ends on test cylinder top cooperate, and the lid is equipped with cross hole post, and the cross hole post is equipped with vertical holes,
The bar that screws includes screwing bar straight-bar and screwing bar chassis, described to screw bar straight-bar across vertical holes and match with vertical holes screw thread
It closes, the bottom end for screwing bar straight-bar is spheroform surface, is equipped with close to the bottom end for screwing bar straight-bar and screws bar straight-bar and fix
First annulus of connection, the top for screwing bar chassis connect the second annulus, and the bottom end for screwing bar straight-bar passes through second
Annulus, the internal diameter of second annulus, which is greater than, screws the diameter of bar straight-bar and less than the outer diameter of the first annulus.
3. varying head soil permeability coefficient measurement device according to claim 2, which is characterized in that the soil body to be measured
The calculation formula of infiltration coefficient are as follows:
kT=2.3a (L2-L1)/(A(t2-t1))*log(H1/H2)
In formula, kTFor the infiltration coefficient of the soil body to be measured；A is the interior basal area of varying head pipe；A is the interior basal area of test cylinder；L1For
Screw bar chassis it is concordant with the lower port of test cylinder lower part when, screw the length that bar straight-bar is located at outside test cylinder；L2To screw bar
When chassis and soil body top just contact, the length that bar straight-bar is located at outside test cylinder is screwed；t1To test initial time；t2For examination
Test finish time；H1The scale of water when for on-test in varying head pipe；H2The quarter of water when for off-test in varying head pipe
Degree.
4. varying head soil permeability coefficient measurement device according to claim 1, which is characterized in that the varying head soil
Osmotic coefficient investigating device further includes auxiliary soil sample barrel, and the upper and lower side of the auxiliary soil sample barrel is open, the auxiliary soil sample barrel
Internal diameter is consistent with the internal diameter on test cylinder top, and the lower end of the auxiliary soil sample barrel and the threaded upper ends on test cylinder top cooperate.
5. varying head soil permeability coefficient measurement device according to claim 1, which is characterized in that the varying head soil
Osmotic coefficient investigating device further includes cutting ring cylinder, and the upper and lower side of the cutting ring cylinder is open, the internal diameter and test cylinder of the cutting ring cylinder
The internal diameter of lower part is consistent, and the upper end of the cutting ring cylinder and the lower thread of test cylinder lower part cooperate, and the lower end of the cutting ring cylinder is set
There is blade.
6. varying head soil permeability coefficient measurement device according to claim 1, which is characterized in that the test bracket packet
Test bracket cylinder and three test bracket supporting legs are included, the test bracket supporting leg and test bracket cylinder are hinged, the test
The upper and lower side of backing holding cylinder is open, and the upper end of the test bracket cylinder offers the first notch and the second notch, the test
The barrel of cylinder lower part is equipped with first and rides and second foot-operated, the described first foot-operated shape and the shape phase of the first notch
To match, the shape of the described second foot-operated shape and the second notch matches, and described first rides and be stuck on the first notch, and described the
Two foot-operated are stuck on the second notch.
7. varying head soil permeability coefficient measurement device according to claim 1, which is characterized in that the sealing cover includes
The threaded upper ends on sealing cover top and sealing cover lower part, the sealing upper part of the cover lower end and test cylinder top cooperate, described close
The outer diameter for covering lower part is consistent with the internal diameter on test cylinder top, and the sealing cover is sealed test cylinder top.
8. varying head soil permeability coefficient measurement device according to claim 1, which is characterized in that the side wall of the sink
On open up sink outlet, the sink outlet connects the first rubber tube.
9. varying head soil permeability coefficient measurement device according to claim 2, which is characterized in that the varying head soil
Osmotic coefficient investigating device further includes hitting real support, and described to hit real support include bottom plate and two vertical bars, two vertical bars point
It is not fixedly connected on the top of bottom plate, a horizontal pin hole is respectively provided in every vertical bar, the horizontal pin hole interpolation enters
Support pin, lateral aperture is additionally provided in the cross hole post, and the lateral aperture and support pin thread cooperate.
10. varying head soil permeability coefficient measurement device according to claim 2, which is characterized in that second annulus
It is connect with bar chassis is screwed by three circle ring racks, one end of the circle ring rack, which is connected to, to screw on bar chassis, the circle
The other end of ring support is connect with the second annulus.
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| CN201910145629.8A CN109752304B (en) | 2019-02-27 | 2019-02-27 | Variable water head soil permeability coefficient measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376115A (en) * | 2019-08-30 | 2019-10-25 | 贵州大学 | A kind of bicyclic infiltration test device and its operating method of two rings one |
| CN115508137A (en) * | 2022-11-03 | 2022-12-23 | 河北省地质矿产勘查开发局国土资源勘查中心(河北省矿山和地质灾害应急救援中心) | Sample collector for hydraulic engineering and geological engineering and use method |
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| CN110376115A (en) * | 2019-08-30 | 2019-10-25 | 贵州大学 | A kind of bicyclic infiltration test device and its operating method of two rings one |
| CN115508137A (en) * | 2022-11-03 | 2022-12-23 | 河北省地质矿产勘查开发局国土资源勘查中心(河北省矿山和地质灾害应急救援中心) | Sample collector for hydraulic engineering and geological engineering and use method |
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