CN105842420B - Unsaturated soil triaxial test matric suction fast balancing device and its application method - Google Patents
Unsaturated soil triaxial test matric suction fast balancing device and its application method Download PDFInfo
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- CN105842420B CN105842420B CN201610179994.7A CN201610179994A CN105842420B CN 105842420 B CN105842420 B CN 105842420B CN 201610179994 A CN201610179994 A CN 201610179994A CN 105842420 B CN105842420 B CN 105842420B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses a kind of unsaturated soil triaxial test matric suction fast balancing device and its application method, including central column porous permeable stone, high air-entry value pottery clay plates, pressure chamber base, sample cap and spiral tank；In pressure chamber base with being inlaid with the high air-entry value pottery clay plates for being connected the central column porous permeable stone of hole air-pressure duct and being connected in central column porous permeable stone with pore water pressure pipeline on sample cap respectively.Spiral tank is installed under high air-entry value pottery clay plates, the water that spiral tank can go out the air bubble under high air-entry value pottery clay plates in pressure chamber base, spiral tank in time, which can transmit water pressure, makes the draining pressure difference of high air-entry value pottery clay plates steady, accelerates drainage efficiency.The present invention is that one kind can shorten drainage exhaust path, so as to shorten matric suction equilibration time to reduce the unsaturated soil triaxial test matric suction fast balancing device and its application method of influence of the matric suction equilibration time to experiment.
Description
Technical field
The present invention relates to a kind of unsaturated soil testing matric suction fast balancing device, and in particular to a kind of unsaturated soil three
Shaft experiment matric suction fast balancing device.
Background technology
When defining the stress state of unsaturated soil, matric suction is considered as an important variable.Therefore, in order to comment
The physical property of valency unsaturated soil under the conditions of various stress variations, just must control or measure matric suction.And " axle translates skill
The method of art " measurement matric suction is that pore air pressure is gradually lifted when testing and carrying out, and will with the high air-entry value material of saturation
Pore water pressure maintains certain reference value, therefore matric suction directly can be controlled.
Research to unsaturated soil shows, either applies matric suction to unsaturated soil, is also due to that unsaturated soil contains
The change of water rate makes its matric suction change, and the change of matric suction is not completed instantaneously.Matric suction change exists
Unsaturation inside soil body reaches that balance needs regular hour (a few houres to several days).Therefore, unsaturated soil three is being carried out
During shaft experiment, the formation of unsaturation inside soil body equilibrium matric suction has and can be later than the requirement of controlling test.How base is shortened
The matter suction equalization time, to reduce influence of the matric suction equilibration time to experiment, is unsaturated soil triaxial test successful implementation
One of key technology.
Existing inside soil body draining rule formula is：
T=TvH2/Cv
T in formulavIt is time factor；CvIt is the coefficient of consolidation of soil；H is the maximum drainage distance of soil layer, if two-sided draining, H is
Soil thickness half, one side draining H is soil layer gross thickness；T is water discharge time；
Square being inversely proportional for the maximum drainage distance of time and soil layer can be known by formula (1)；The non-of sample two ends drainage exhaust satisfies
Reduce in discharge (or entrance) path for making unsaturation soil sample reclaimed water and gas with native triaxial test matric suction fast balancing device
50%.So in theory, the suction equalization time is reduced to the 25% of common unsaturated soil experiment.
The content of the invention
First technical problem to be solved by this invention, which is to provide one kind, can shorten drainage exhaust path, so as to shorten base
The matter suction equalization time is fast with the unsaturated soil triaxial test matric suction for reducing influence of the matric suction equilibration time to experiment
Fast bascule.
Second technical problem to be solved by this invention is to provide the unsaturated soil triaxial test matric suction quick flat
The application method of weighing apparatus device.
In order to solve above-mentioned first technical problem, the unsaturated soil triaxial test matric suction quick flat that the present invention is provided
Weigh device, including sample cap and pressure chamber base, be all built-in with described sample cap and pressure chamber base hole air-pressure duct,
Pore water pressure pipeline and back-pressure pipeline, described pressure chamber base is with being inlaid with the hole pneumatic tube described in being connected on sample cap
The central column porous permeable stone in road and connect in described central column porous permeable stone and with described pore water pressure pipeline
The high air-entry value pottery clay plates connect constitute double-drainage gas extraction system；Described sample cap and it is described in be equipped with described height
Spiral tank below air-entry value pottery clay plates, one end of described spiral tank is connected with described pore water pressure pipeline, another
End is connected with described back-pressure pipeline；Baroceptor and hole gas pressure regulator and described sample cap and pressure chamber base
On hole air-pressure duct connected by pneumatic control valve, in described hole gas pressure regulator, described sample cap and described
Pressure chamber base on hole air-pressure duct on be respectively arranged with minor valve；Back-pressure sensor and backpressure controllers and described
Sample cap and described pressure chamber base on back-pressure pipeline connected by back pressure control valve, described backpressure controllers,
Minor valve is respectively arranged with described back-pressure pipeline on described sample cap and pressure chamber base；Described sample cap and pressure
Described pore water pressure pipeline on the base of power room is connected by the pore water pressure control valve of tee valve type and is merged into a pipe
Road, connection pore water pressure measurement pipeline.
Described high air-entry value pottery clay plates, central column porous permeable stone, pressure chamber base inner side and described spiral water
The very useful epoxy resin of groove of groove is bound tightly together, it is ensured that described high air-entry value pottery clay plates and central column porous permeable
Gap between the side of stone and described pressure chamber base is sealed.
The material of described central column porous permeable stone is stainless steel plate with holes.
The material of described sample cap is lucite.
The material of described pressure chamber base is stainless steel material.
It is that degassed water, degassed water and spiral shell are full of in reservoir chamber, reservoir chamber inside described pressure chamber base and sample cap
Rotary water groove and high air-entry value pottery clay plates are in contact, it is to avoid spiral tank and high air-entry value pottery clay plates bottom surface bubble occur and hinder hole
Water is discharged and causes matric suction equilibration time to lengthen.
In order to solve above-mentioned second technical problem, the use unsaturated soil triaxial test matric suction that the present invention is provided is fast
The method of fast bascule, by 4 joints in pressure chamber base respectively with supporting plastic tube and interior room, mistress, air pressure, anti-
Pressure is connected, then saturation pressure room base and high air-entry value pottery clay plates again, connects first in back-pressure pipeline and pore water pressure pipeline
The air discharged respectively before base in respective pipe is connected to, then at a pressure, water is passed through into spiral water from a connector
The inlet opening of groove and osculum flow to another connector, and the connector without pressure should be less than the water surface, to rinse high air inlet
The bubble gathered under value pottery clay plates, is stayed in when can't see bubble in pipe, is just stopped, then, then being turned around, such water is just at two
All flow in direction；After in ensuring back-pressure pipeline and pore water pressure pipeline all without gas, back pressure control valve and hole are opened
Hydraulic control valve, positive back-pressure one small is applied to the bottom of high air-entry value pottery clay plates, absolute maximum by backpressure controllers
It is worth for 50KPa, allows degassed water to flow through the spiral tank saturation pressure room base under high air-entry value pottery clay plates and high air-entry value clay
Plate, until the continuous globule of being emerged on high air-entry value pottery clay plates, then turns off back pressure control valve and pore water pressure control valve；This
When high air-entry value pottery clay plates it is fully saturated and with allowing water to pass freely through and limit the property that gas passes through, so then pass through
Pore air pressure is gradually lifted, and sample is become unsaturation for 0 pore water pressure control with the high air-entry value pottery clay plates of saturation
State；
Treat after pressure chamber base and high air-entry value pottery clay plates all saturations, high air-entry value clay plate top surface is wiped with wet towel
Water, then will be cased with the sample of rubber membrane upper and lower side and sample cap and pressure chamber base tied respectively with rubber band it is solid
It is fixed；Air inlet pipe is attached with plastic conduit with hole air-pressure duct, and hole air-pressure duct is then porous by central column
Water stone and sample contacts；Then balancing gate pit's interior room is installed, water pump is connected to control interior room plumbing by plastic conduit
Valve, opens the valve of connection interior room, then enters osculum to interior room by interior room and fill degassed water；It is then shut off controlling interior room discharge
The valve of water, the plastic conduit for connecting water pump is connected to the valve of control mistress's plumbing, opens the valve of connection mistress, then
Osculum is entered to interior room by mistress and fills degassed water；Then balancing gate pit's upper cover is installed, carrying out experiment using computer sets value；Wait to set
Value is finished, and back pressure control valve and pneumatic control valve are opened immediately, now controls gas pressure regulator and back-pressure to control by computer
Device can make sample reach the matric suction value of setting after a certain time；Then the Rule of judgment balanced according to matric suction is i.e.
The body of sample becomes in 24 hours can judge whether suction reaches balance less than the 0.05% of sample cumulative volume, treat that matric suction reaches
To after balance, by the way that ensuing experiment can be carried out to computer installation test procedure.
Using the unsaturated soil triaxial test matric suction fast balancing device and its application method of above-mentioned technical proposal, pressure
It is porous with being located at central column that power room base is connected the central column porous permeable stone of hole air-pressure duct with being inlayed respectively on sample cap
The high air-entry value pottery clay plates being connected in permeable stone with pore water pressure pipeline, constitute double-drainage-gas extraction system.High air-entry value pottery clay plates
Lower installation spiral tank, the water energy that spiral tank can go out the air bubble under high air-entry value pottery clay plates in base, groove in time
Transmission water pressure makes the draining pressure difference of high air-entry value pottery clay plates steady, accelerates drainage efficiency.The present invention, which can be realized, makes unsaturated soil
Pore water in sample can be simultaneously from the high air-entry value pottery clay plates discharge at the top and bottom of sample, and hole gas can be with simultaneously from sample
Top and bottom porous permeable stone discharge, this double-drainage-gas extraction system make unsaturation soil sample reclaimed water and gas discharge (or
Into) path reduces 50%, so as to greatly shorten unsaturated soil matric suction equilibration time, improves unsaturated soil testing efficiency.
So in theory, the suction equalization time is reduced to the 25% of common unsaturated soil experiment.
High air-entry value pottery clay plates, porous permeable stone, on the inside of pressure chamber base and spiral tank the very useful epoxy resin of groove
It is bound tightly together, it is ensured that between the side of high air-entry value pottery clay plates and central column porous permeable stone and pressure chamber base
Gap is sealed.
Embedded high air-entry value pottery clay plates can be with according to special pottery clay plates of the test requirements document from various inlet value.It is flat in axle
In shifting technology, it is 0 to set pore water pressure, so the pore water in sample can be from the high air-entry value clay being embedded on sample cap
Plate is discharged, and shortens drainage path.
Be that degassed water is full of in reservoir chamber, reservoir chamber inside pressure chamber base and sample cap, degassed water and spiral tank and
High air-entry value pottery clay plates are in contact, it is to avoid spiral tank and high air-entry value pottery clay plates bottom surface occur bubble hinder pore water discharge and
Matric suction equilibration time is caused to lengthen.
Baroceptor passes through with the hole air-pressure duct on hole gas pressure regulator and sample cap and pressure chamber base
Pneumatic control valve is connected, on the hole air-pressure duct on hole gas pressure regulator and sample cap 1 and pressure chamber base respectively
Minor valve is provided with, can realize and each air-pressure duct is individually controlled.
High air-entry value pottery clay plates are connected by back-pressure pipeline with back-pressure sensor, back-pressure sensor and backpressure controllers and
Back-pressure pipeline on sample cap and pressure chamber base is connected by back pressure control valve, in backpressure controllers and sample cap and pressure
Minor valve is respectively arranged with back-pressure pipeline on the base of room, can realize and each pressure conduit is individually controlled.
Pore water pressure pipeline on sample cap and pressure chamber base is connected simultaneously by the pore water pressure control valve of tee valve type
It is merged into a pipeline, connection pore water pressure measurement pipeline.
Beneficial effects of the present invention：
1. double-drainage gas extraction system of the present invention can shorten drainage exhaust path 50%, put down so as to shorten matric suction
The weighing apparatus time 75%, influence of the matric suction equilibration time to experiment is reduced, the precision and data for effectively improving experiment can the property leaned on.
2. the air bubble under high air-entry value pottery clay plates can be gone out base, spiral in time by spiral tank of the present invention
Water in tank, which can transmit water pressure, makes the draining pressure difference of high air-entry value pottery clay plates steady, accelerates drainage efficiency.
3. pneumatic control valve of the present invention, back pressure control valve and pore water pressure control valve are simple in construction, reasonable in design
And it is easy to operation.
In summary, the present invention is that one kind can shorten drainage exhaust path, so as to shorten matric suction equilibration time to subtract
Lack the unsaturated soil triaxial test matric suction fast balancing device of influence of the matric suction equilibration time to experiment and its use
Method.
Brief description of the drawings
Fig. 1 decomposes front schematic view for the sample cap of the present invention with pressure chamber base.
Fig. 2 is sample cap of the invention and pressure chamber base exploded side schematic diagram.
Fig. 3 assembles front schematic view for the sample cap, sample and pressure chamber base of the present invention.
Fig. 4 assembles side schematic view for the sample cap, sample and pressure chamber base of the present invention.
Fig. 5 is pressure chamber base schematic diagram of the invention.
Fig. 6 is sample cap schematic diagram of the invention.
Fig. 7 is back pressure control valve schematic diagram of the invention.
Fig. 8 is pore water pressure control valve schematic diagram of the invention.
Fig. 9 is pneumatic control valve schematic diagram of the invention.
In figure：1- sample caps, 2- pressure chamber bases, 3- spiral tanks, 4- inlet openings, 5- osculums, 6- pressure holes, 7- is high
Enter makings pottery clay plates, 8- porous permeable stones, 9- interior rooms enter osculum, 10- fixing bolts, 11- reservoir chambers, 12- samples, 13- rubbers
Thin skin film, 14- back-pressure pipelines, 15- pore water pressure pipelines, 16- hole air-pressure ducts, 17- interior room drainpipes, 18- air inlet pipe,
19- back pressure control valves, 20- pore water pressure control valves, 21- pneumatic control valves.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, a kind of unsaturated soil triaxial test matric suction
Fast balancing device, including sample cap 1 and pressure chamber base 2, pressure chamber base 2 are provided with fixing bolt 10, interior room drainpipe
17, interior room drainpipe 17 enters in osculum 9, sample cap 1 and pressure chamber base 2 provided with interior room is all built-in with hole air-pressure duct
16th, pore water pressure pipeline 15 and back-pressure pipeline 14, the outlet of hole air-pressure duct 16 is pressure hole 6, pressure chamber base 2 and sample
The central column porous permeable stone 8 of connection hole air-pressure duct 16 is inlaid with cap 1 and in central column porous permeable stone 8
And the high air-entry value pottery clay plates 7 being connected with pore water pressure pipeline 15 constitute double-drainage gas extraction system；Sample cap 1 and interior it is equipped with place
Spiral tank 3 in the described lower section of high air-entry value pottery clay plates 7, one end of spiral tank 3 is connected with pore water pressure pipeline 15, separately
One end is connected with back-pressure pipeline 14；Baroceptor and the hole on hole gas pressure regulator and sample cap 1 and pressure chamber base 2
Gap air-pressure duct 16 is connected by pneumatic control valve 21, the hole in hole gas pressure regulator, sample cap 1 and pressure chamber base 2
Minor valve is respectively arranged with gap air-pressure duct；On back-pressure sensor and backpressure controllers and sample cap 1 and pressure chamber base 2
Back-pressure pipeline 14 connected by back pressure control valve 19, on backpressure controllers, described sample cap 1 and pressure chamber base 2
Minor valve is respectively arranged with back-pressure pipeline 14；Pore water pressure pipeline 15 on sample cap 1 and pressure chamber base 2 passes through triple valve
The pore water pressure control valve 20 of formula connects and is merged into a pipeline, connection pore water pressure measurement pipeline.
Specifically, high air-entry value pottery clay plates 7, central column porous permeable stone 8, the inner side of pressure chamber base 2 and spiral tank 3
The very useful epoxy resin of groove be bound tightly together, it is ensured that the side of high air-entry value pottery clay plates 7 and central column porous permeable stone 8
Gap between face and described pressure chamber base 2 is sealed.
Specifically, the material of central column porous permeable stone 8 is stainless steel plate with holes.
Specifically, the material of sample cap 1 is lucite.
Specifically, the material of pressure chamber base 2 is stainless steel material.
Further, it is that degassed water is full of in reservoir chamber 11, reservoir chamber 11 inside pressure chamber base 2 and sample cap 1, removes
Air water is in contact with spiral tank 3 and high air-entry value pottery clay plates 7, it is to avoid spiral tank 3 and the high bottom surface of air-entry value pottery clay plates 7 occur
Bubble hinders pore water discharge and causes matric suction equilibration time to lengthen.
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, it is Φ that the present embodiment, which is applied to specimen size,
The unsaturation triaxial test of the ㎜ of 61.8 ㎜ × 125 soil sample, before being tested, first prepares sample simultaneously according to centrifugal modeling standard
By its saturated process.The central column that pressure chamber base 2 is connected hole air-pressure duct 16 with being inlaid with respectively on sample cap 1 is porous
Water stone 8 and the high air-entry value pottery clay plates 7 being connected in central column porous permeable stone 8 with pore water pressure pipeline 15, are constituted double
Water-gas extraction system.Height enters a diameter of 32mm of makings pottery clay plates 7, thick 7mm.Material is permeable for the annulus column-shaped porous of stainless steel
The interior diameter of stone 8 is 36mm, and overall diameter is 52, and thickness is 3mm.A diameter of 32mm spiral tank 3 is made pottery installed in high air-entry value
Under native plate 7.Specifically, high air-entry value pottery clay plates 7, central column porous permeable stone 8, the inner side of pressure chamber base 2 and spiral tank 3
The very useful epoxy resin of groove be bound tightly together, it is ensured that the side of high air-entry value pottery clay plates 7 and central column porous permeable stone 8
Gap between face and pressure chamber base 2 is sealed.
4 joints in pressure chamber base 2 are connected with supporting plastic tube with interior room, mistress, air pressure, back-pressure respectively
Connect.Then saturation pressure room base 2 and high air-entry value pottery clay plates 7 again, connect in back-pressure pipeline 14 and pore water pressure pipeline 15 first
The air discharged respectively before base in respective pipe is connected to, then at a pressure, water is passed through into spiral water from a connector
The inlet opening 4 of groove 3 and osculum 5 flow to another connector, and the connector without pressure should be less than the water surface, be entered with rinsing height
The bubble of the accumulation of gas value pottery clay plates 7 times, stays in when can't see bubble in pipe, then, then can just be turned around, such water with stopping
Just all flowed in both direction；After in ensuring back-pressure pipeline 14 and pore water pressure pipeline 15 all without gas, back-pressure is opened
Control valve 19 and pore water pressure control valve 20, positive back-pressure one small is applied to high air-entry value pottery clay plates by backpressure controllers
7 bottom (bare maximum is 50KPa), allows degassed water to flow through the saturation pressure room of spiral tank 3 under high air-entry value pottery clay plates 7
Base 2 and high air-entry value pottery clay plates 7, until the continuous globule of being emerged on high air-entry value pottery clay plates, then turns off back-pressure control
Valve 19 and pore water pressure control valve 20.Now high air-entry value pottery clay plates 7 it is fully saturated and with allowing water to pass freely through and limit gas
The property that body passes through, so then can be by gradually lifting pore air pressure, and with the high air-entry value pottery clay plates 7 of saturation by hole
Water pressure control makes sample become unsaturated state for 0.
Treat after pressure chamber base 2 and high air-entry value pottery clay plates 7 all saturations, high air-entry value pottery clay plates 7 are wiped with wet towel
The water of top surface, the upper and lower side that then will be cased with the sample 12 of rubber membrane 13 uses rubber respectively with sample cap 1 and pressure chamber base 2
Muscle ties fixation.Air inlet pipe 18 is attached with plastic conduit with hole air-pressure duct 16, and hole air-pressure duct 16 then leads to
Cross central column porous permeable stone 8 and sample contacts.Then balancing gate pit's interior room is installed, water pump is connected to control by plastic conduit
The valve of interior room plumbing processed, opens the valve of connection interior room, then can enter osculum 9 by interior room and fill degassed water to interior room.So
The valve of closing control interior room plumbing, the plastic conduit for connecting water pump is connected to the valve of control mistress's plumbing, beaten afterwards
The valve of connection mistress is opened, then osculum can be entered by mistress and fill degassed water to interior room.Then balancing gate pit's upper cover is installed, meter is utilized
Calculation machine carries out experiment and sets value.Value to be set is finished, and back pressure control valve 19 and pneumatic control valve 21 are opened immediately, now passes through computer
The matric suction value for controlling gas pressure regulator and backpressure controllers that sample 12 can be made to reach setting after a certain time.Then root
The Rule of judgment (body of sample becomes 0.05% less than sample cumulative volume in 24 hours) balanced according to matric suction can judge to inhale
Whether power reaches balance, after matric suction reaches balance, ensuing by that can be carried out to computer installation test procedure
Experiment.
Below in conjunction with accompanying drawing and technical scheme, the embodiment to the present invention is further described.Certain our department
The description divided is only that the present invention is demonstrated and explained, and any equivalent transformation made according to technical scheme,
Protection scope of the present invention should be belonged to.
Claims (7)
1. a kind of unsaturated soil triaxial test matric suction fast balancing device, including sample cap (1) and pressure chamber base (2),
It is characterized in that：Hole air-pressure duct (16), pore water pressure are all built-in with described sample cap (1) and pressure chamber base (2)
Pipeline (15) and back-pressure pipeline (14), described pressure chamber base (2) is with being inlaid with the hole described in being connected on sample cap (1)
The central column porous permeable stone (8) of air-pressure duct (16) and in described central column porous permeable stone (8) and with it is described
Pore water pressure pipeline (15) connection high air-entry value pottery clay plates (7) constitute double-drainage-gas extraction system；Described sample cap (1)
With the spiral tank (3) being equipped with described pressure chamber base (2) below described high air-entry value pottery clay plates (7), institute
The one end for the spiral tank (3) stated is connected with described pore water pressure pipeline (15), the other end and described back-pressure pipeline (14)
Connection；Baroceptor and the hole air pressure on hole gas pressure regulator and described sample cap (1) and pressure chamber base (2)
Pipeline (16) is connected by pneumatic control valve (21), in described hole gas pressure regulator, described sample cap (1) and described
Minor valve is respectively arranged with hole air-pressure duct in pressure chamber base (2)；Back-pressure sensor and backpressure controllers and institute
Back-pressure pipeline (14) on the sample cap (1) stated and described pressure chamber base (2) is connected by back pressure control valve (19), in institute
Set respectively on described back-pressure pipeline (14) on the backpressure controllers stated, described sample cap (1) and pressure chamber base (2)
There is minor valve；Described pore water pressure pipeline (15) on described sample cap (1) and pressure chamber base (2) passes through tee valve type
Pore water pressure control valve (20) connect and be merged into a pipeline, connection pore water pressure measurement pipeline.
2. unsaturated soil triaxial test matric suction fast balancing device according to claim 1, it is characterised in that：It is described
High air-entry value pottery clay plates (7), central column porous permeable stone (8), on the inside of pressure chamber base (2) and described spiral tank
(3) the very useful epoxy resin of groove is bound tightly together.
3. unsaturated soil triaxial test matric suction fast balancing device according to claim 1 or 2, it is characterised in that：
The material of described central column porous permeable stone (8) is stainless steel plate with holes.
4. unsaturated soil triaxial test matric suction fast balancing device according to claim 1 or 2, it is characterised in that：
The material of described sample cap (1) is lucite.
5. unsaturated soil triaxial test matric suction fast balancing device according to claim 1 or 2, it is characterised in that：
The material of described pressure chamber base (2) is stainless steel material.
6. unsaturated soil triaxial test matric suction fast balancing device according to claim 1 or 2, it is characterised in that：
It is to be full of degassed water, degasification in reservoir chamber (11), reservoir chamber (11) inside described pressure chamber base (2) and sample cap (1)
Water is in contact with described spiral tank (3) and high air-entry value pottery clay plates (7), it is to avoid described spiral tank (3) and high air inlet
There is bubble and hinders pore water discharge and cause matric suction equilibration time to lengthen in value pottery clay plates (7) bottom surface.
7. the method for the unsaturated soil triaxial test matric suction fast balancing device described in usage right requirement 1, its feature exists
In：4 joints in pressure chamber base are connected with supporting plastic tube with interior room, mistress, air pressure, back-pressure respectively, then
Saturation pressure room base and high air-entry value pottery clay plates, distinguish first before back-pressure pipeline and pore water pressure pipeline are connected to base again
The air in respective pipe is discharged, then at a pressure, by water from inlet opening of the connector by spiral tank and row
Water hole flows to another connector, and the connector without pressure should be less than the water surface, is gathered with rinsing under high air-entry value pottery clay plates
Bubble, stay in when can't see bubble in pipe, just stop, then, then turning around, such water just all flows in both direction；
After in ensuring back-pressure pipeline and pore water pressure pipeline all without gas, back pressure control valve and pore water pressure control valve are opened, is led to
Cross backpressure controllers and apply positive back-pressure one small to the bottom of high air-entry value pottery clay plates, bare maximum is 50KPa, allows and removes
Air water flows through spiral tank saturation pressure room base and high air-entry value pottery clay plates under high air-entry value pottery clay plates, until high air-entry value
Emerged on pottery clay plates the continuous globule, then turn off back pressure control valve and pore water pressure control valve；Now high air-entry value clay
Plate is fully saturated and has and allows water to pass freely through and limit the property that gas passes through, so then by gradually lifting hole gas
Pressure, and sample is become unsaturated state for 0 pore water pressure control with the high air-entry value pottery clay plates of saturation；
Treat after pressure chamber base and high air-entry value pottery clay plates all saturations, high air-entry value clay plate top surface is wiped with wet towel
Water, the upper and lower side that then will be cased with the sample of rubber membrane ties fixation with rubber band respectively with sample cap and pressure chamber base；
Air inlet pipe is attached with plastic conduit with hole air-pressure duct, and hole air-pressure duct then passes through central column porous permeable stone
With sample contacts；Then balancing gate pit's interior room is installed, water pump is connected to the valve of control interior room plumbing by plastic conduit,
The valve of connection interior room is opened, then osculum is entered to interior room by interior room and fills degassed water；It is then shut off controlling interior room plumbing
Valve, the plastic conduit for connecting water pump is connected to the valve of control mistress's plumbing, is opened the valve of connection mistress, is then passed through
Mistress enters osculum and fills degassed water to interior room；Then balancing gate pit's upper cover is installed, carrying out experiment using computer sets value；Wait to set value complete
Finish, back pressure control valve and pneumatic control valve are opened immediately, be by computer control gas pressure regulator and backpressure controllers now
Sample can be made to reach the matric suction value of setting after a certain time；Then Rule of judgment i.e. 24 balanced according to matric suction are small
When interior sample body become and 0.05% can judge whether suction reaches balance less than sample cumulative volume, treat that matric suction reaches flat
After weighing apparatus, by the way that ensuing experiment can be carried out to computer installation test procedure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610179994.7A CN105842420B (en) | 2016-03-28 | 2016-03-28 | Unsaturated soil triaxial test matric suction fast balancing device and its application method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610179994.7A CN105842420B (en) | 2016-03-28 | 2016-03-28 | Unsaturated soil triaxial test matric suction fast balancing device and its application method |
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| CN105842420B true CN105842420B (en) | 2017-09-15 |
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| CN109406365A (en) * | 2018-11-29 | 2019-03-01 | 中国科学院武汉岩土力学研究所 | A kind of three axis gas injection experimental rig of geotechnique and method of fast assembling-disassembling |
| CN109540680B (en) * | 2018-12-06 | 2022-08-05 | 长安大学 | Quick saturator of miniature tensiometer |
| CN110568151A (en) * | 2019-08-05 | 2019-12-13 | 中交天津港湾工程研究院有限公司 | Measuring method for measuring unsaturated soil matrix suction in centrifugal model test |
| CN112504862B (en) * | 2020-11-10 | 2022-03-22 | 中南大学 | Measurement control method for controlling substrate suction and temperature by adopting dynamic and static triaxial apparatus |
| CN114563274A (en) * | 2022-01-14 | 2022-05-31 | 温州大学 | Consolidation apparatus clay plate exhaust device and exhaust method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6234008B1 (en) * | 1999-12-08 | 2001-05-22 | Massachusetts Institute Of Technology | Method and apparatus for the direct measurement of moisture characteristics of porous samples of soil, wood, concrete and the like |
| CN201233393Y (en) * | 2008-06-05 | 2009-05-06 | 长沙理工大学 | Lab nonsaturated earth substrate attracting force determinator |
| CN101592574B (en) * | 2009-06-30 | 2011-08-03 | 三峡大学 | Triaxial creep tester of unsaturated soil |
| CN102507307A (en) * | 2011-10-28 | 2012-06-20 | 西安理工大学 | Sealing device for pressure chamber of true triaxial apparatus |
| CN103226081B (en) * | 2013-04-08 | 2015-03-25 | 西安理工大学 | True triaxial apparatus of unsaturated soil |
| CN103969422B (en) * | 2014-05-08 | 2016-04-06 | 同济大学 | A kind of matric suction control methods of roadbed wetting-drying test |
| CN204536321U (en) * | 2015-03-24 | 2015-08-05 | 宁波工程学院 | Measure the triaxial test top cap of matric suction |
| CN204789158U (en) * | 2015-07-14 | 2015-11-18 | 中国科学院武汉岩土力学研究所 | Triaxial test device of many field couplings of unsaturated soil |
| CN204807373U (en) * | 2015-07-29 | 2015-11-25 | 清华大学 | Sample sealing device of ground true triaxil tester |
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