CN110320075A - The device and method of low disturbance dry sand sample is prepared on triaxial test platform - Google Patents
The device and method of low disturbance dry sand sample is prepared on triaxial test platform Download PDFInfo
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- CN110320075A CN110320075A CN201910574141.7A CN201910574141A CN110320075A CN 110320075 A CN110320075 A CN 110320075A CN 201910574141 A CN201910574141 A CN 201910574141A CN 110320075 A CN110320075 A CN 110320075A
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- sample
- split cavity
- latex film
- test platform
- dry sand
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
Abstract
The application belongs to the manufacture technology field of sand sample, provides a kind of device and method that low disturbance dry sand sample is prepared on triaxial test platform, device includes split cavity, latex film and vacuum pump etc..Split cavity is two semicircle cylinders；Latex film is set in split cavity, and triaxial apparatus pedestal is fixed on by rubber seal in lower end, and the upper end is fixed at the top of split cavity, and one section of enclosure space is formed between split cavity and latex film；Two semicircle two rows of vertical pumping slots of cylinder inner wall setting and multiple rows of laterally pumping slot, laterally and multiple aspirating holes are arranged in vertical pumping slot junction, aspirating hole is controlled to a vacuum pump after being converged by pumping afflux groove, is extracted out the gas between split cavity and latex film by vacuum pump；Pass through the vacuum meter and vacuum control valve being arranged on vacuum line, precision control pressure of inspiration(Pi)；Certifiable latex film is fitted tightly on split cavity, is reduced latex film and is bonded not tight bring sample preparation error, improves sample preparation precision and efficiency.
Description
Technical field
This application involves the production of single test sand sample, specially a kind of that low disturbance is prepared on triaxial test platform
The device and method of dry sand sample.
Background technique
China is an earthquake-prone countries, and building and structures of the foundation on sand-layer foundation are numerous.Saturated sand
Liquefaction phenomenon can occur under seismic loading for soil, i.e. bearing capacity of sandy ground completely loses, this will cause foundation instability and
Depression, the collapsing of building or structures, urban lifeline wprks and great personnel and property loss, Research statistics
Show that loss caused by earthquake liquefaction accounts for the 15-30% of earthquake disaster damage.It is therefore desirable to the dynamic characteristics progress to sand
Research.
The test method of research Sand Liquefaction characteristic mainly has laboratory test and field test at present.In laboratory test
For triaxial test due to effective, convenient and efficient, accuracy is high, is widely adopted.Sand is due to needing to control relative compaction, generally
Utilize layering compacting process sample preparation；It, cannot can be direct as clay simultaneously because the features such as cohesive strength is small, plasticity is low and easy disturbance
Required size is cut into using soil-cutter to be installed on triaxial apparatus again, therefore selects suitable sample preparation device directly on triaxial apparatus
It is particularly important to exact test result is obtained to make low disturbance sample.
At present there are mainly two types of sand sample production methods, first is that latex film is fixed on triaxial apparatus pedestal, then install general
Logical split cavity, and will be reversely fixed at the top of latex film at the top of common split cavity, due to the every valve semicircle diaphragm of this kind of split cavity
Only one aspirating hole, pumping, which starts latex film at rear aspirating hole, can be attracted on split cavity immediately and block aspirating hole,
Therefore it is only capable of on a small quantity extracting the air in latex film and split cavity intermediate seal space out, most latex films and split cavity are simultaneously
It is not bonded.On the one hand this will lead to latex film during compaction hammer lifts and can be driven, thus serious disturbance sand sample；Separately
One side latex film and split cavity fitting can tightly not seriously affect dry sand sample uniformity, thus strong influence test result is quasi-
True property.It hits in fact second is that sand sample is put into small-sized split cavity to specified relative compaction, sand sample taking-up is then placed on three axis
On instrument, finally by emulsion film a set of on sand sample.This method the disadvantage is that sample in moving process or again fill sample during meeting
It is disturbed to a certain extent, it is serious to will lead to soil sample avalanche or collapse, intensity to sample and structural have very big shadow
It rings, to influence the accuracy of test result.
Summary of the invention
The purpose of the application is aiming at the problem that being difficult to that low disturbance triaxial test dry sand model is made, and provides one kind three
The device and method of low disturbance dry sand sample is prepared on shaft experiment platform.
In order to achieve the above objectives, the application provides the following technical solutions:
A kind of device preparing low disturbance dry sand sample on triaxial test platform, including triaxial test platform, sample preparation portion
Part and air-extractor；Triaxial test platform includes containing sample pedestal, top cap, glass capsulation cover and test platform pedestal；Sample preparation component
Including latex film, split cavity, permeable stone, filter paper item；Air-extractor includes vacuum meter, vacuum control valve, vacuum pump；
Glass capsulation cover is mounted on test platform pedestal, and collectively forms closed test cavity with test platform pedestal
Room；It contains sample pedestal and top cap is respectively positioned in test chamber, contain sample pedestal and be mounted on test platform pedestal, top cap is mounted on glass
Glass seal closure inner top is simultaneously located above Sheng sample pedestal；
It contains and is fixed with latex film between sample pedestal and top cap, a permeable stone is respectively arranged in the upper and lower ends inside latex film,
A filter paper item is respectively arranged in the inside of two permeable stones, is used to place dry sand sample between two filter paper items；
Split cavity is arranged outside latex film, split cavity includes the semicircle cylinder of two pairings connection, is disposed on semicircle cylinder
Laterally pumping slot, vertically pumping slot, aspirating hole, pumping afflux groove, gas outlet；Semicircle cylinder has certain thickness comprising interior
Side section and exterior portion；Lateral pumping slot and vertical pumping slot are latticed in being mutually perpendicular to intersect, and are arranged in semicircle cylinder
Inboard portion inner sidewall on；Aspirating hole is arranged in the infall of laterally pumping slot and vertical pumping slot, and is connected to pumping
Afflux groove；Pumping afflux groove is longitudinally arranged in the exterior portion of semicircle cylinder, and each semicircle cylinder arranges two, is evacuated afflux
The inside of slot is connected to each aspirating hole, is evacuated on the gas outlet for being connected to the exterior portion of semicircle cylinder on the outside of afflux groove；Outlet
The exterior portion that mouth is arranged in semicircle cylinder passes through vacuum pump for the gas between split cavity and latex film after being controlled to a vacuum pump
Extraction；
It contains sample chassis interior and is additionally provided with drainage channel, drainage channel one end is connect with the permeable stone below dry sand sample,
Its other end, which passes through vacuum pump after being controlled to a vacuum pump, to be evacuated to negative pressure inside dry sand sample.
Further, air-extractor further includes vacuum meter, vacuum control valve；
Vacuum control valve be arranged between split cavity and vacuum pump on, for control the speed of exhaust and latex film with it is split
Laminating degree between mould；
Vacuum meter is arranged between split cavity and vacuum pump, for showing the gas of enclosure space between split cavity and latex film
Pressure.
Further, the upper and lower ends of latex film each by a rubber seal be individually fixed in contain sample pedestal top with
In top cap.
Further, an o-ring groove is respectively arranged in the upper and lower ends of the inboard portion of semicircle cylinder, to accommodate sealing
Rubber ring.
Further, the inboard portion of semicircle cylinder is higher than exterior portion；
The o-ring groove being located above is arranged on the lateral wall of the inboard portion of semicircle cylinder, and the sealing ring of lower section is recessed
Slot is arranged on the inner sidewall of the inboard portion of semicircle cylinder.
Further, the o-ring groove lower part of the inboard portion of semicircle cylinder is laid with the support of the arc to extend internally
The lower part of the inboard portion of item, support bar and semicircle cylinder collectively forms the reversed shoulder of arc, and semicircle cylinder passes through reversed platform
Shoulder, which is supported in, to be contained on sample pedestal.
Further, it is provided with positioning pin on the side that the exterior portion of two semicircle cylinders is in contact, is used for two and half
Circular cylinder accurate alignment.
Further, it is laid with end plane sealing strip along longitudinal direction on the side that the inboard portion of two semicircle cylinders is in contact, and
Each contact surface of two semicircle cylinders respectively arranges one, to fit closely together after guarantee two semicircle cylinder pairings, no
Gas leakage situation can occur, and ensure that the fitting of split cavity and latex film.
Further, handle is installed on the lateral wall of semicircle cylinder exterior portion, for operating split cavity.
It may be implemented to make dry sand sample directly on triaxial apparatus using herein described device, without making elsewhere again
It is moved on triaxial apparatus, reduces the disturbance in moving process to sample.In sample making course, since split cavity inner wall is laterally evacuated
The infall of slot and vertical pumping slot is respectively provided with aspirating hole, improves pumping efficiency, strengthens between latex film and split cavity
Laminating degree；Meanwhile the exterior portion of two semicircle cylinders of split cavity is also respectively provided with two rows of pumping afflux grooves, pumping collection
All aspirating holes are connected to by chute on one side, and another side is connected to by gas outlet with vacuum pump, increase pumping efficiency；In addition, right
Vacuum meter and vacuum control valve are set between die sinking and vacuum pump, can also effectively control the fitting journey of split cavity and latex film
Degree.
The application also provides a kind of method that low disturbance dry sand sample is prepared on triaxial test platform, comprising:
(1) it is sequentially placed permeable stone and filter paper item on containing sample pedestal, then latex film lower part is covered and is containing sample pedestal top
Hold blend rubber sealing ring banding；
(2) o-ring groove of two of split cavity semicircle cylinder lower parts is aligned to the rubber seal of latex film lower part,
And be fastened in the rubber seal, it is merged after two semicircle cylinder pairings by positioning pin, and pass through three circular boops
Fixed, three circular boops are sequentially sleeved at outside two semicircle cylinders from the top down and tighten fixation；
(3) latex film top is evened up naturally and is reversely covered at the top of split cavity, while with rubber seal banding, needing to protect
Card latex film is flat and fit in split cavity inner wall and non-distorted；
(4) gas outlet of split cavity, vacuum meter, vacuum control valve, vacuum pump are sequentially connected using vacuum tube, and will be true
Empty control valve is closed, and is first connected vacuum pump and is carried out continuing pumping, then open and adjust vacuum control valve, fits closely latex film
In split cavity inner wall and laterally pumping slot and vertical pumping slot will not be sucked into；
(5) it loads sample: using layering compacting process sample preparation, dry sand sample point being slowly added to latex film for seven layers using funnel
It is interior, it is filled and led up after the completion of every layer of addition, and hit in fact with compaction hammer to specified altitude assignment；
(6) it is sequentially placed filter paper item, permeable stone and top cap in dry sand sample top surface after the completion of dress sample, unloaded at the top of split cavity
Rubber seal, latex film flip-top is fitted in top cap, blend rubber sealing ring banding；
(7) vacuum tube is extracted to from gas outlet and is connected to drainage channel, it is evacuated and is kept using vacuum pump
Certain negative pressure；
(8) split cavity is removed, has negative pressure inside dry sand sample at this time, its original state can be kept without being disturbed；
(9) glass capsulation cover is mounted on test platform pedestal by bolt, at this time glass capsulation cover and test platform
Confined space is formed in the test cavity body that pedestal is constituted, dry sand sample is applied in water flowing into confined space by triaxial apparatus confining pressure chamber
Add confining pressure load to carry out consolidation and completes sample preparation.
Compared with prior art, the application has the beneficial effect that
(1) the application can prepare the sand sample model of specified size directly on triaxial apparatus, without preparing elsewhere
It is moved again on triaxial apparatus after good sample, therefore is effectively reduced the mobile disturbance to sand sample structure.
(2) split cavity that the application uses, is provided with horizontal and vertical pumping slot on the inside of each of which semicircle cylinder, and
Aspirating hole is arranged in two rows of vertical intersections, while the two rows of vertical pumping affluxs of setting among each semicircle barrel thickness direction
Slot avoids the case where single aspirating hole is blocked and cannot continue pumping, ensure that entire latex film can be closely adhered to right
It is opened on inner wall, avoids because latex film is bonded the bad disturbance for causing sand sample.
(3) pass through the vacuum meter and vacuum control valve that are arranged on vacuum line, precision control pressure of inspiration(Pi)；It can guarantee cream
Glue film is fitted tightly on split cavity, is reduced latex film and is bonded not tight bring sample preparation error, improves sample preparation precision and effect
Rate.
Detailed description of the invention
Fig. 1 is facing for the device provided by the embodiments of the present application that low disturbance dry sand sample is prepared on triaxial test platform
Figure.
Fig. 2 is the vertical view of the device provided by the embodiments of the present application that low disturbance dry sand sample is prepared on triaxial test platform
Figure.
Fig. 3 is the structural schematic diagram after the completion of triaxial apparatus sample preparation provided by the embodiments of the present application.
Fig. 4 is the structural schematic diagram outside split cavity provided by the embodiments of the present application.
Fig. 5 is the front view of split cavity provided by the embodiments of the present application.
Fig. 6 is the top view of split cavity provided by the embodiments of the present application.
Sectional view when Fig. 7 is split cavity sample preparation provided by the embodiments of the present application at pumping afflux groove.
Appended drawing reference: latex film 1, vacuum control valve 3, vacuum tube 4, vacuum pump 5, split cavity 6, contains sample pedestal at vacuum meter 2
7, top cap 8, glass capsulation cover 9, permeable stone 10, drainage channel 11, dry sand sample 12, bolt 13, test platform pedestal 14, rubber
Sealing ring 15, circular boop 16, support bar 17, laterally pumping slot 18, vertical pumping slot 19, aspirating hole 20, pumping afflux groove 21, outlet
Mouth 22, positioning pin 23, o-ring groove 24, handle 25, end plane sealing strip 26, filter paper item 27.
Specific embodiment
The application is described in detail in the following with reference to the drawings and specific embodiments.
Embodiment
As shown in figs. 1-7, a kind of device preparing low disturbance dry sand sample on triaxial test platform, including pumping are set
Standby, sample preparation component and triaxial test platform.Wherein, air-extractor includes vacuum meter 2, vacuum control valve 3, vacuum tube 4, vacuum pump
5；Triaxial test platform includes containing sample pedestal 7, top cap 8, glass capsulation cover 9 and test platform pedestal 14；Sample preparation component includes cream
Glue film 1, split cavity 6, permeable stone 10, filter paper item 27, rubber seal 15, circular boop 16.
Further, glass capsulation cover 9 is mounted on test platform pedestal 14 by bolt 13, and with test platform pedestal 14
Collectively form closed test chamber；It contains sample pedestal 7 and top cap 8 is respectively positioned in test chamber, contain sample pedestal 7 and be mounted on test
On platform base 14, top cap 8, which is mounted on 9 inner top of glass capsulation cover and is located at, contains 7 top of sample pedestal, and it is total that sample pedestal 7 is contained in cooperation
With fixed dry sand sample 12.
Further, it contains between sample pedestal 7 and top cap 8 and is provided with latex film 1, the top of latex film 1 passes through rubber seal
15 are fixed on 8 lower end of top cap.In a preferred embodiment, it contains sample pedestal 7 and top cap 8 is all made of cylindrical shape, latex film 1
Bottom, which can be set in, contains 1 top of sample pedestal, and fixed by rubber seal 15, and the top of latex film 1 is set in 8 bottom of top cap
End, fixed also by rubber seal 15, the inside of latex film 1 is for containing and protecting dry sand sample 12.
Further, latex film 1 is internally provided with two permeable stones 10 and two filter paper items 27, two about 10 phases of permeable stone
To setting, a permeable stone 10 is located at 8 lower section of top cap, another permeable stone 10, which is located at, contains 7 top of sample pedestal, two filter paper items 27
It is oppositely arranged and is located between two permeable stones 10 up and down, dry sand sample 12 is placed between two filter paper items 27.
Further, split cavity 6 is arranged with outside latex film 1.Split cavity 6 includes two semicircle cylinders, and two semicircle cylinders are right
It is fixedly connected after conjunction by three circular boops 16 of housing；Three circular boops 16 are located at the lower part, middle part and top of split cavity 6,
Two semicircle cylinders are fixed in three different locations respectively, are spliced with the split cavity 6 for ensuring that two semicircle cylinder pairings are constituted
It is close air tight.
Further, the support bar 17 extended inwardly and laterally pumping slot 18, vertical pumping are disposed on semicircle cylinder
Slot 19, aspirating hole 20, pumping afflux groove 21, gas outlet 22, positioning pin 23, o-ring groove 24, handle 25 and end plane sealing strip
26；Semicircle cylinder has certain thickness, can be divided into inboard portion and exterior portion, and inboard portion is higher than exterior portion；Sealing
Circle groove 24 is arranged in the upper and lower ends of the inboard portion of semicircle cylinder to accommodate sealing rubber ring 15, and the sealing ring of top is recessed
Slot 24 is arranged on the lateral wall of the inboard portion of semicircle cylinder, and the inside of semicircle cylinder is arranged in the o-ring groove 24 of lower section
On partial inner sidewall and it is located at 17 top of support bar；Lay oriented in 24 lower part of o-ring groove of the inboard portion of semicircle cylinder
The lower part of the inboard portion of the support bar 17 of the arc of interior extension, support bar 17 and semicircle cylinder collectively forms the reversed platform of arc
Shoulder, semicircle cylinder are supported directly upon by reversed shoulder and are contained on sample pedestal 7；Laterally pumping slot 18 and vertical pumping slot 19 are in mutual
Square crossing it is latticed, be arranged in the inner sidewall of the inboard portion of semicircle cylinder；Aspirating hole 20 is arranged in laterally pumping slot 18
With the infall of vertical pumping slot 19, and it is connected to pumping afflux groove 21；Pumping afflux groove 21 is longitudinally arranged in semicircle cylinder
Exterior portion, and each semicircle cylinder arranges two, the inside of pumping afflux groove 21 is connected to each aspirating hole 20, is evacuated afflux groove 21
The outside exterior portion that is connected to semicircle cylinder gas outlet 22 on；Gas outlet 22 is arranged in the exterior portion of semicircle cylinder,
And it is connected by vacuum tube 4 with vacuum pump 5；Positioning pin 23 is arranged in the side that the exterior portion of two semicircle cylinders is in contact
On, it is used for two semicircle cylinder accurate alignments；End plane sealing strip 26 is longitudinally arranged in the inside portion split-phase of two semicircle cylinders
On the side of contact, and each contact surface of two semicircle cylinders respectively arranges one, with tight after guarantee two semicircle cylinder pairings
It is closely connected to be combined, gas leakage situation will not occur, and ensure that the fitting of split cavity 6 and latex film 1；Handle 25 is arranged in semicircle
On the lateral wall of shape cylinder exterior portion, for operating split cavity 6.
Further, the gas outlet 22 of split cavity 6, vacuum meter 2, vacuum control valve 3, vacuum pump 5 pass sequentially through the company of vacuum tube 4
It connects, is extracted out the gas between split cavity 6 and latex film 1 by vacuum pump 5；Vacuum control valve 3 is arranged in split cavity 6 and vacuum
On vacuum tube 4 between pump 5, for controlling the laminating degree between the speed of exhaust and latex film 1 and split cavity 6；Vacuum meter 2
It is arranged on the vacuum tube 4 between split cavity 6 and vacuum pump 5, for showing enclosure space between split cavity 6 and latex film 1
Air pressure.
It contains and is additionally provided with drainage channel 11 inside sample pedestal 7,11 one end of drainage channel is permeable with 12 lower section of dry sand sample
Stone 10 connects, and the other end, which passes through vacuum pump 5 after connecting with vacuum pump 5, to be evacuated to certain negative pressure inside dry sand sample 12.
Further, triaxial test platform further includes triaxial apparatus confining pressure chamber, by triaxial apparatus confining pressure chamber to glass capsulation cover 9 with
Water flowing in the test cavity body that test platform pedestal 14 is constituted applies confining pressure load to dry sand sample 12 and consolidates.
It may be implemented to make dry sand sample directly on triaxial apparatus using herein described device, without making elsewhere again
It is moved on triaxial apparatus, reduces the disturbance in moving process to sample.In sample making course, since 6 inner wall of split cavity is laterally taken out
The infall of air drain 18 and vertical pumping slot 19 is respectively provided with aspirating hole 20, improves pumping efficiency, strengthens latex film 1 and split
Laminating degree between mould 6；Meanwhile the exterior portion of two semicircle cylinders of split cavity 6 is also respectively provided with two rows of pumping collection
All aspirating holes 20 are connected to by chute 21, pumping afflux groove 21 on one side, and another side is connected to by gas outlet 22 with vacuum pump 5, is increased
Pumping efficiency is added；In addition, vacuum meter 2 and vacuum control valve 3 are arranged between split cavity 6 and vacuum pump 5, can also effectively control
The laminating degree of split cavity 6 and latex film 1.
For example and without limitation, height 140mm, diameter can be set by dry sand specimen size in the present embodiment
70mm；Split cavity 6 can be made of two semicircle aluminum barrels, be highly 200mm, with a thickness of 24.5mm, interior diameter 71mm；Support
The width of item 17 is 30mm, with a thickness of 2mm；The width of o-ring groove 24 is 20mm, depth 2.5mm；The spiral shell of positioning pin 23
Wire hole diameter is 6mm；Laterally the width of pumping slot 18 and vertical pumping slot 19 is 1mm, and depth is 1mm, and laterally pumping slot
18 settings 16, the vertical slot 19 that is evacuated are arranged 2；The hole internal diameter of aspirating hole 23 is 1.4mm, altogether two rows, every row totally 16, and with
Two rows pumping afflux groove 21 is connected to；The length for being evacuated afflux groove 21 is 140mm, diameter 7mm.
The device provided by the present application that low disturbance dry sand sample is prepared on triaxial test platform makes low disturbance dry sand examination
The test method of sample are as follows:
(1) it is sequentially placed permeable stone 10 and filter paper item 27 on containing sample pedestal 7, then 1 lower part of latex film is covered and is containing sample
7 top blend rubber sealing ring of pedestal, 15 banding；
(2) o-ring groove 24 of two of split cavity 6 semicircle cylinder lower parts is aligned to the rubber seal of 1 lower part of latex film
Circle 15, and be fastened in the rubber seal 15, it is merged after two semicircle cylinder pairings by positioning pin 23, and pass through
Three circular boops 16 are fixed, and three circular boops 1 are sequentially sleeved at outside two semicircle cylinders from the top down and tighten fixation；
(3) 1 top of latex film is evened up naturally and is reversely covered at the top of split cavity 6, while with 15 banding of rubber seal,
It need to guarantee that latex film 1 is flat and fit in 6 inner wall of split cavity and non-distorted；
(4) using vacuum tube 4 by the gas outlet 22 of split cavity 6, vacuum meter 2, vacuum control valve 3, vacuum pump 5 successively phase
Even, and vacuum control valve 3 is closed, connects 5 power supply of vacuum pump and carry out continuing pumping, opening and adjusting vacuum control valve 3 makes very
Empty 2 air pressure of table is shown as 2-3kPa, and latex film 1 is fitted tightly over 6 inner wall of split cavity and will not be sucked into laterally pumping slot at this time
25 are evacuated slot 26 with vertical；
(5) it loads sample: using layering compacting process sample preparation, dividing seven layers to be slowly added to latex on dry sand sample 12 using funnel
It in film 1, fills and leads up after the completion of every layer of addition, and is hit in fact with compaction hammer to specified altitude assignment；
(6) it is sequentially placed filter paper item, permeable stone 10 and top cap 8 in 12 top surface of dry sand sample after the completion of dress sample, unloaded split
The rubber seal 15 at 6 top of mould, 1 flip-top of latex film is fitted in top cap 8,15 banding of blend rubber sealing ring；
(7) vacuum tube 4 is extracted from gas outlet 22 and is connected to drainage channel 11, it is evacuated using vacuum pump 5
And keep 5kPa negative pressure；
(8) split cavity 6 is removed, has 5kPa negative pressure inside dry sand sample 12 at this time, its original state can be kept without disturbed
It is dynamic；
(9) glass capsulation cover 9 is mounted on test platform pedestal 14 by bolt 13, at this time glass capsulation cover 9 and examination
It tests and forms confined space in the test cavity body of the composition of platform base 14, the water flowing into confined space of triaxial apparatus confining pressure chamber can be passed through
Apply confining pressure load to dry sand sample 12 to consolidate, completes sample preparation.
Foregoing description is only the description to the application preferred embodiment, is not any restriction to the application range.Appoint
Any change or modification what those skilled in the art makes according to the technology contents of the disclosure above should all regard
For equivalent effective embodiment, the range of technical scheme protection is belonged to.
Claims (10)
1. a kind of device for preparing low disturbance dry sand sample on triaxial test platform, it is characterised in that: flat including triaxial test
Platform, sample preparation component and air-extractor；Triaxial test platform includes containing sample pedestal (7), top cap (8), glass capsulation cover (9) and test
Platform base (14)；Sample preparation component includes latex film (1), split cavity (6), permeable stone (10), filter paper item (27)；Air-extractor packet
Include vacuum meter (2), vacuum control valve (3), vacuum pump (5)；
Glass capsulation cover (9) is mounted on test platform pedestal (14), and is collectively formed with test platform pedestal (14) closed
Test chamber；It contains sample pedestal (7) and top cap (8) is respectively positioned in test chamber, contain sample pedestal (7) and be mounted on test platform pedestal
(14) on, top cap (8) is mounted on glass capsulation cover (9) inner top and is located at and contains above sample pedestal (7)；
It contains and is fixed with latex film (1) between sample pedestal (7) and top cap (8), the internal upper and lower ends of latex film (1) are respectively arranged one
Permeable stone (10), the inside of two permeable stones (10) are respectively arranged a filter paper item (27), are used to put between two filter paper items (27)
Set dry sand sample (12)；
It is arranged split cavity (6) outside latex film (1), split cavity (6) includes the semicircle cylinder of two pairings connection, cloth on semicircle cylinder
It is equipped with laterally pumping slot (18), is vertically evacuated slot (19), aspirating hole (20), pumping afflux groove (21), gas outlet (22)；It is semicircle
Cylinder has certain thickness comprising inboard portion and exterior portion；Laterally pumping slot (18) and vertical pumping slot (19) are in mutual
Square crossing it is latticed, be arranged on the inner sidewall of the inboard portion of semicircle cylinder；Aspirating hole (20) is arranged in lateral pumping
The infall of slot (18) and vertical pumping slot (19), and it is connected to pumping afflux groove (21)；Pumping afflux groove (21) is longitudinally arranged
In the exterior portion of semicircle cylinder, and each semicircle cylinder arranges two, and the inside of pumping afflux groove (21) is connected to each aspirating hole
(20), it is evacuated on the gas outlet (22) for the exterior portion for being connected to semicircle cylinder on the outside of afflux groove (21)；Gas outlet (22) cloth
Be placed in semicircle cylinder exterior portion connect with vacuum pump (5) after by vacuum pump (5) by split cavity (6) and latex film (1) it
Between gas extraction；
It contains and is additionally provided with drainage channel (11) inside sample pedestal (7), below drainage channel (11) one end and dry sand sample (12)
Permeable stone (10) connection, the other end will be evacuated to negative by vacuum pump (5) inside dry sand sample (12) after connecting with vacuum pump (5)
Pressure.
2. the device according to claim 1 for preparing low disturbance dry sand sample on triaxial test platform, it is characterised in that:
Air-extractor further includes vacuum meter (2), vacuum control valve (3)；
On vacuum control valve (3) is arranged between split cavity (6) and vacuum pump (5), for controlling the speed of exhaust and latex film
(1) laminating degree between split cavity (6)；
Vacuum meter (2) is arranged between split cavity (6) and vacuum pump (5), for showing between split cavity (6) and latex film (1)
The air pressure of enclosure space.
3. the device according to claim 1 or 2 for preparing low disturbance dry sand sample on triaxial test platform, feature exist
In: the upper and lower ends of latex film (1) are individually fixed in each by a rubber seal (15) and contain sample pedestal (7) top and top
On cap (8).
4. the device according to claim 3 for preparing low disturbance dry sand sample on triaxial test platform, it is characterised in that:
An o-ring groove (24) is respectively arranged in the upper and lower ends of the inboard portion of semicircle cylinder, to accommodate sealing rubber ring (15).
5. the device according to claim 4 for preparing low disturbance dry sand sample on triaxial test platform, it is characterised in that:
The inboard portion of semicircle cylinder is higher than exterior portion；
On the lateral wall for the inboard portion that semicircle cylinder is arranged in the o-ring groove (24) being located above, the sealing ring of lower section is recessed
On the inner sidewall for the inboard portion that semicircle cylinder is arranged in slot (24).
6. the device according to claim 1 or 2 for preparing low disturbance dry sand sample on triaxial test platform, feature exist
In: o-ring groove (24) lower part of the inboard portion of semicircle cylinder is laid with the support bar (17) of the arc to extend internally, branch
The lower part of the inboard portion of stay (17) and semicircle cylinder collectively forms the reversed shoulder of arc, and semicircle cylinder passes through reversed shoulder
It is supported in and contains on sample pedestal (7).
7. the device according to claim 1 or 2 for preparing low disturbance dry sand sample on triaxial test platform, feature exist
In: positioning pin (23) are provided on the side that the exterior portion of two semicircle cylinders is in contact, for two semicircle cylinders are quasi-
Really alignment.
8. the device according to claim 1 or 2 for preparing low disturbance dry sand sample on triaxial test platform, feature exist
In: it is laid with along longitudinal direction end plane sealing strip (26) on the side that the inboard portion of two semicircle cylinders is in contact, and two semicircles
Each contact surface of shape cylinder respectively arranges one, fits closely together after making two semicircle cylinder pairings.
9. the device according to claim 1 or 2 for preparing low disturbance dry sand sample on triaxial test platform, feature exist
In: it is equipped on the lateral wall of semicircle cylinder exterior portion handle (25), for operating split cavity (6).
10. a kind of method for preparing low disturbance dry sand sample on triaxial test platform characterized by comprising
(1) it is sequentially placed permeable stone (10) and filter paper item (27) on containing sample pedestal (7), then covers latex film (1) lower part
Contain sample pedestal (7) top blend rubber sealing ring (15) banding；
(2) rubber of o-ring groove (24) alignment latex film (1) lower part of two of split cavity (6) semicircle cylinder lower parts is close
Seal (15), and be fastened in the rubber seal (15), merged by positioning pin (23) one after two semicircle cylinder pairings
It rises, and fixed by three circular boops (16), three circular boops (16) are sequentially sleeved at outside two semicircle cylinders from the top down and tighten
It is fixed；
(3) latex film (1) top is evened up naturally and is reversely covered at the top of split cavity (6), while bound round with rubber seal (15)
Tightly, it need to guarantee that latex film (1) is flat and fit in split cavity (6) inner wall and non-distorted；
(4) utilize vacuum tube (4) by the gas outlet (22) of split cavity (6), vacuum meter (2), vacuum control valve (3), vacuum pump (5)
It is sequentially connected, and vacuum control valve (3) is closed, first connect vacuum pump (5) and carry out continuing pumping, then open and adjust vacuum control
Valve (3) processed makes latex film (1) be fitted tightly over split cavity (6) inner wall and will not be sucked into laterally pumping slot (25) and vertical pumping
Air drain (26)；
(5) it loads sample: using layering compacting process sample preparation, dividing seven layers for dry sand sample (12) using funnel and be slowly added to latex film
(1) it in, fills and leads up after the completion of every layer of addition, and is hit in fact with compaction hammer to specified altitude assignment；
(6) it is sequentially placed filter paper item (27) after the completion of dress sample in dry sand sample (12) top surface, permeable stone (10) and top cap (8) are unloaded
Latex film (1) flip-top is fitted on top cap (8) by the rubber seal (15) at the top of lower split cavity (6), and blend rubber is close
Seal (15) banding；
(7) vacuum tube (4) is extracted and is connected to drainage channel (11) from gas outlet (22), it is carried out using vacuum pump (5)
It is evacuated and keeps certain negative pressure；
(8) split cavity (6) are removed, has negative pressure inside dry sand sample (12) at this time, its original state can be kept without being disturbed；
(9) glass capsulation cover (9) are mounted on test platform pedestal (14) by bolt (13), at this time glass capsulation cover (9)
Confined space is formed in the test cavity body constituted with test platform pedestal (14), is led to by triaxial apparatus confining pressure chamber into confined space
Water applies confining pressure load to dry sand sample (12) and carries out consolidation completion sample preparation.
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| CN112945735A (en) * | 2021-04-12 | 2021-06-11 | 昆明理工大学 | Layered triaxial experiment tailing sample loading device |
| CN113702119A (en) * | 2021-06-08 | 2021-11-26 | 同济大学 | Device and method for preparing low-disturbance dry sand sample on triaxial test platform |
| CN114002029A (en) * | 2021-10-14 | 2022-02-01 | 华中科技大学 | Device and method for preparing sample from sandy soil outside instrument |
| WO2022135222A1 (en) * | 2020-12-25 | 2022-06-30 | 长安大学 | Device and method for preparing sandy soil sample using water method |
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