CN105842420A - Unsaturated soil tri-axial test matrix suction quick balance apparatus and use method thereof - Google Patents
Unsaturated soil tri-axial test matrix suction quick balance apparatus and use method thereof Download PDFInfo
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- CN105842420A CN105842420A CN201610179994.7A CN201610179994A CN105842420A CN 105842420 A CN105842420 A CN 105842420A CN 201610179994 A CN201610179994 A CN 201610179994A CN 105842420 A CN105842420 A CN 105842420A
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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 an unsaturated soil tri-axial test substrate matrix quick balance apparatus and a use method thereof. The apparatus includes annular-column-shaped porous water permeable stone, a high-air-entry ceramic plate, a pressure chamber pedestal, a sample cap and a spiral water trough. The annular-column-shaped porous water permeable stone connecting a pore air pressure pipeline and the high-air-entry ceramic plate, which is arranged in the annular-column-shaped porous water permeable stone and is connected to the pore air pressure pipeline, are respectively embedded in the pressure chamber pedestal and the sample cap. The spiral water trough is arranged below the high-air-entry ceramic plate and is used for ejecting the air bubbles under the high-air-entry ceramic plate from pressure chamber pedestal in time. Water in the spiral water trough transmits water pressure to stabilize the water discharge pressure difference in the high-air-entry ceramic plate, thereby accelerating water discharge. The apparatus and the method can reduce water and gas discharge path, so that matrix quick balance time is reduced to reduce the influence of the matrix quick balance time on the test.
Description
Technical field
The present invention relates to a kind of unsaturated soil testing matric suction fast balancing device, be specifically related 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
Valency is the physical property of unsaturated soil under the conditions of various STRESS VARIATION, is necessary for controlling or measuring matric suction.And " axle translation skill
Art " measure matric suction method be gradually to promote pore air pressure when test is carried out, and with saturated high air-entry value material general
Pore water pressure maintains certain reference value, therefore can directly control matric suction.
Research to unsaturated soil shows, either unsaturated soil is applied matric suction, or owing to unsaturated soil contains
The change of water rate makes its matric suction change, and the change of matric suction is the most instantaneous to be completed.Matric suction change exists
Unsaturation inside soil body reaches balance and needs the regular hour (several hours to several days).Therefore, unsaturated soil three is being carried out
During shaft experiment, being formed of unsaturation inside soil body equilibrium matric suction can be later than the requirement of controlling test.How to shorten base
The matter suction equalization time, to reduce the impact on test of the matric suction equilibration time, 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 it is time factor；CvIt it is the coefficient of consolidation of soil；H is soil layer maximum drainage distance, 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 to of time and soil layer maximum drainage distance can be known by formula (1)；The non-of sample two ends drainage exhaust satisfies
Discharge (or entrance) path making water and gas in unsaturation soil sample with soil triaxial test matric suction fast balancing device is reduced
50%.So in theory, the suction equalization time is reduced to the 25% of common unsaturated soil experiment.
Summary of the invention
First technical problem to be solved by this invention is to provide one and can shorten drainage exhaust path, thus shortens base
The matter suction equalization time is fast on the unsaturated soil triaxial test matric suction of the impact of test to reduce matric suction equilibration time
Speed bascule.
Second technical problem to be solved by this invention is to provide this unsaturated soil triaxial test matric suction quick flat
The using 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 provides
Weighing apparatus device, including sample cap and pressure chamber base, described sample cap and pressure chamber base are all built-in with hole air-pressure duct,
Pore water pressure pipeline and back-pressure pipeline, described pressure chamber base be all inlaid with the hole pneumatic tube described in being connected on sample cap
The central column porous permeable stone in road and be positioned in described central column porous permeable stone and with described pore water pressure pipeline even
The high air-entry value pottery clay plates connect constitutes double-drainage gas extraction system；Described sample cap and described in be equipped with and be in 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, at 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,
It is respectively arranged with minor valve on 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, connects pore water pressure and measures pipeline.
Inside described high air-entry value pottery clay plates, central column porous permeable stone, pressure chamber base 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 corrosion resistant plate with holes.
The material of described sample cap is lucite.
The material of described pressure chamber base is stainless steel material.
It is reservoir chamber inside described pressure chamber base and sample cap, in reservoir chamber, is full of degassed water, degassed water and spiral shell
Rotary water groove and high air-entry value pottery clay plates contact, it is to avoid spiral tank and high air-entry value pottery clay plates bottom surface occur that bubble hinders hole
Water is discharged and is caused 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 provides is fast
The method of speed bascule, by 4 joints in pressure chamber base respectively with supporting plastic tube and interior room, mistress, air pressure, instead
Pressure is connected, the most again saturation pressure room base and high air-entry value pottery clay plates, first connects at back-pressure pipeline and pore water pressure pipeline
Discharge the air in respective pipe before receiving base respectively, the most at a pressure, water is passed through spiral water from a union joint
The inlet opening of groove and osculum flow to another union joint, do not have the union joint of pressure should be less than the water surface, to rinse high air inlet
Under value pottery clay plates, the bubble of accumulation, stays in when can't see bubble in pipe, just stops, then, then turning around, and such water is just at two
All flow in direction；After all there is no gas in guaranteeing back-pressure pipeline and pore water pressure pipeline, open back pressure control valve and hole
Hydraulic control valve, applies the little positive back-pressure bottom to high air-entry value pottery clay plates, absolute maximum by backpressure controllers
Value for 50KPa, allows the spiral tank saturation pressure room base and high air-entry value potter's clay that degassed water flows through under high air-entry value pottery clay plates
Plate, until the continuous print globule of emerging on high air-entry value pottery clay plates, then turns off back pressure control valve and pore water pressure control valve；This
Time height air-entry value pottery clay plates fully saturated and have and allow water pass freely through and limit the property that gas passes through, the most then pass through
Gradually promote pore air pressure, and control pore water pressure to be 0 to make sample become unsaturation with saturated high air-entry value pottery clay plates
State；
Treat pressure chamber base and high air-entry value pottery clay plates the most saturated after, with wet towel wipe high air-entry value pottery clay plates end face
Water, then tie solid by being cased with the upper and lower side of the sample of rubber membrane respectively with rubber band with sample cap and pressure chamber base
Fixed；Being attached with hole air-pressure duct by air inlet pipe plastic conduit, hole air-pressure duct is then saturating by central column porous
Water stone and sample contacts；Then install room in pressure chamber, be connected to control the plumbing of interior room by plastic conduit by water pump
Valve, opens the valve of room in connecting, then enters the inside room of osculum by interior room and fill degassed water；It is then shut off controlling interior room discharge
The valve of water, is connected to control the valve of mistress's plumbing by the plastic conduit connecting water pump, opens the valve connecting mistress, then
Enter the inside room of osculum by mistress and fill degassed water；Then pressure chamber upper cover is installed, utilizes computer to carry out test and set value；Wait to set
It is worth complete, opens back pressure control valve and pneumatic control valve immediately, control gas pressure regulator now by computer and back-pressure controls
Device can make sample reach the matric suction value set after a certain time；Then according to the Rule of judgment of matric suction balance it is
In 24 hours the body of sample diminish in sample population long-pending 0.05% can judge whether suction reaches balance, treat that matric suction reaches
After balance, by computer installation test procedure can be carried out ensuing test.
Use unsaturated soil triaxial test matric suction fast balancing device and the using method thereof of technique scheme, pressure
Power room base with inlay the central column porous permeable stone that is connected hole air-pressure duct on sample cap respectively and be positioned at central column porous
The high air-entry value pottery clay plates being connected with pore water pressure pipeline in permeable stone, constitutes double-drainage-gas extraction system.High air-entry value pottery clay plates
Lower installation spiral tank, the air bubble under high air-entry value pottery clay plates can be gone out base by spiral tank in time, the water energy in groove
Transmission water pressure makes the draining pressure reduction of high air-entry value pottery clay plates steadily, accelerates drainage efficiency.The present invention can realize making unsaturated soil
Pore water in sample can high air-entry value pottery clay plates from sample top and bottom be discharged simultaneously, and hole gas can be with simultaneously from sample
The porous permeable stone of top and bottom is discharged, this double-drainage-gas extraction system make water and gas in unsaturation soil sample discharge (or
Enter) path minimizing 50%, thus it is greatly shortened unsaturated soil matric suction equilibration time, improve unsaturated soil testing efficiency.
So in theory, the suction equalization time is reduced to the 25% of common unsaturated soil experiment.
Inside high air-entry value pottery clay plates, porous permeable stone, pressure chamber base and the very useful epoxy resin of groove of spiral tank
It is bound tightly together, it is ensured that between high air-entry value pottery clay plates and the side of central column porous permeable stone and pressure chamber base
Gap is sealed.
Embedded high air-entry value pottery clay plates can be to select the special pottery clay plates of various inlet value according to test requirements document.Put down at axle
In shifting technology, arranging pore water pressure is 0, so the pore water in sample can be from the high air-entry value potter's clay being embedded in sample cap
Plate is discharged, and shortens drainage path.
Pressure chamber base and sample cap are internal be reservoir chamber, be full of in reservoir chamber degassed water, degassed water and spiral tank and
High air-entry value pottery clay plates contacts, 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 connects, on the hole air-pressure duct on hole gas pressure regulator and sample cap 1 and pressure chamber base respectively
It is provided with minor valve, can realize each air-pressure duct is individually controlled.
High air-entry value pottery clay plates is connected with back-pressure sensor by back-pressure pipeline, back-pressure sensor and backpressure controllers and
Back-pressure pipeline on sample cap and pressure chamber base is connected by back pressure control valve, at backpressure controllers and sample cap and pressure
It is respectively arranged with minor valve on back-pressure pipeline on the base of room, can realize each pressure conduit is individually controlled.
Pore water pressure pipeline on sample cap and pressure chamber base is connected also by the pore water pressure control valve of tee valve type
It is merged into a pipeline, connects pore water pressure and measure pipeline.
Beneficial effects of the present invention:
Double-drainage gas extraction system the most of the present invention can shorten drainage exhaust path 50%, thus shorten matric suction and put down
The weighing apparatus time 75%, reducing the impact on test of the matric suction equilibration time, the precision and the data that are effectively improved test can be by property.
Air bubble under high air-entry value pottery clay plates can be gone out base, spiral by spiral tank the most of the present invention in time
Water in tank can transmit water pressure and make the draining pressure reduction of high air-entry value pottery clay plates steadily, accelerates drainage efficiency.
Pneumatic control valve the most of the present invention, back pressure control valve and pore water pressure control valve simple in construction, reasonable in design
And it is convenient to operate.
In sum, the present invention is that one can shorten drainage exhaust path, thus shortens matric suction equilibration time to subtract
The unsaturated soil triaxial test matric suction fast balancing device of few matric suction equilibration time impact on testing and use thereof
Method.
Accompanying drawing explanation
Fig. 1 is that the sample cap of the present invention decomposes front schematic view with pressure chamber base.
Fig. 2 is sample cap and the pressure chamber base exploded side schematic diagram of the present invention.
Fig. 3 is the sample cap of the present invention, sample and pressure chamber base assembling front schematic view.
Fig. 4 is the sample cap of the present invention, sample and pressure chamber base assembling side schematic view.
Fig. 5 is the pressure chamber base schematic diagram of the present invention.
Fig. 6 is the sample cap schematic diagram of the present invention.
Fig. 7 is the back pressure control valve schematic diagram of the present invention.
Fig. 8 is the pore water pressure control valve schematic diagram of the present invention.
Fig. 9 is the pneumatic control valve schematic diagram of the present invention.
In figure: 1-sample cap, 2-pressure chamber base, 3-spiral tank, 4-inlet opening, 5-osculum, 6-pressure hole, 7-is high
Air inlet matter pottery clay plates, 8-porous permeable stone, in 9-, osculum is entered in room, and 10-fixes bolt, 11-reservoir chamber, 12-sample, 13-rubber
Skin thin film, 14-back-pressure pipeline, 15-pore water pressure pipeline, 16-hole air-pressure duct, room drain pipe in 17-, 18-air inlet pipe,
19-back pressure control valve, 20-pore water pressure control valve, 21-pneumatic control valve.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
See 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 is provided with fixing bolt 10, interior room drain pipe
17, interior room drain pipe 17 is provided with interior room and enters in osculum 9, sample cap 1 and pressure chamber base 2 to be all built-in with hole air-pressure duct
16, 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
All it is inlaid with on cap 1 and connects the central column porous permeable stone 8 of hole air-pressure duct 16 and be positioned 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 constitutes double-drainage gas extraction system；Sample cap 1 and interior be equipped with place
Spiral tank 3 below described 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
It is respectively arranged with minor valve on gap air-pressure duct；In back-pressure sensor and backpressure controllers and sample cap 1 and pressure chamber base 2
Back-pressure pipeline 14 connected, in backpressure controllers, described sample cap 1 and pressure chamber base 2 by back pressure control valve 19
It is respectively arranged with minor valve on back-pressure pipeline 14；Pore water pressure pipeline 15 on sample cap 1 and pressure chamber base 2 passes through three-way valve
The pore water pressure control valve 20 of formula connects and is merged into a pipeline, connects pore water pressure and measures pipeline.
Specifically, inside high air-entry value pottery clay plates 7, central column porous permeable stone 8, pressure chamber base 2 and spiral tank 3
The very useful epoxy resin of groove be bound tightly together, it is ensured that high air-entry value pottery clay plates 7 and the side of 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 corrosion resistant 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, pressure chamber base 2 and sample cap 1 inside are reservoir chamber 11, be full of degassed water, remove in reservoir chamber 11
Air water contacts with spiral tank 3 and high air-entry value pottery clay plates 7, it is to avoid spiral tank 3 and high air-entry value pottery clay plates 7 bottom surface occur
Bubble hinders pore water to discharge and cause matric suction equilibration time to lengthen.
Seeing 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 is applicable to specimen size
The unsaturation triaxial test of the soil sample of 61.8 × 125, before testing, first prepares sample also according to centrifugal modeling standard
By its saturated process.Pressure chamber base 2 is with to be inlaid with the central column porous being connected hole air-pressure duct 16 on sample cap 1 respectively saturating
Water stone 8 be positioned in central column porous permeable stone 8 the high air-entry value pottery clay plates 7 being connected with pore water pressure pipeline 15, constitute double
Water-gas extraction system.A diameter of 32mm of high air inlet matter pottery clay plates 7, thick 7mm.Material is that stainless annulus column-shaped porous is permeable
The interior diameter of stone 8 is 36mm, and overall diameter is 52, and thickness is 3mm.The spiral tank 3 of a diameter of 32mm is arranged on high air-entry value pottery
Soil plate 7 times.Concrete, inside high air-entry value pottery clay plates 7, central column porous permeable stone 8, pressure chamber base 2 and spiral tank 3
The very useful epoxy resin of groove be bound tightly together, it is ensured that high air-entry value pottery clay plates 7 and the side of 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 interior room, mistress, air pressure, back-pressure with supporting plastic tube respectively
Connect.Saturation pressure room base 2 and high air-entry value pottery clay plates 7 the most again, first connects at back-pressure pipeline 14 and pore water pressure pipeline 15
Discharge the air in respective pipe before receiving base respectively, the most at a pressure, water is passed through spiral water from a union joint
Inlet opening 4 and the osculum 5 of groove 3 flow to another union joint, do not have the union joint of pressure should be less than the water surface, enter rinsing height
The bubble of gas value pottery clay plates 7 times accumulation, stays in when can't see bubble in pipe, just then, then can turn around, such water with stopping
Just all flow in both direction；After all there is no gas in guaranteeing back-pressure pipeline 14 and pore water pressure pipeline 15, open back-pressure
Control valve 19 and pore water pressure control valve 20, apply a little positive back-pressure to high air-entry value pottery clay plates by backpressure controllers
The bottom (bare maximum is 50KPa) of 7, allows degassed water flow through the spiral tank 3 saturation pressure room under high air-entry value pottery clay plates 7
Base 2 and high air-entry value pottery clay plates 7, until the continuous print globule of emerging on high air-entry value pottery clay plates, then turn off back-pressure control
Valve 19 and pore water pressure control valve 20.The highest air-entry value pottery clay plates 7 is fully saturated and has and allows water pass freely through and to limit gas
The property that body passes through, the most then can be by gradually promoting pore air pressure, and with saturated high air-entry value pottery clay plates 7 by hole
Water pressure controls to be 0 to make sample become unsaturated state.
Treat pressure chamber base 2 and high air-entry value pottery clay plates 7 the most saturated after, with wet towel wipe high air-entry value pottery clay plates 7
The water of end face, then uses rubber by the upper and lower side being cased with the sample 12 of rubber membrane 13 with sample cap 1 and pressure chamber base 2 respectively
Muscle ties fixing.Being attached with hole air-pressure duct 16 by air inlet pipe 18 plastic conduit, hole air-pressure duct 16 then leads to
Cross central column porous permeable stone 8 and sample contacts.Then install room in pressure chamber, water pump is connected to control by plastic conduit
The valve of room plumbing in system, opens the valve of room in connecting, then can enter the inside room of osculum 9 by interior room and fill degassed water.So
The valve of room plumbing in rear closing control, is connected to the plastic conduit connecting water pump control the valve of mistress's plumbing, beats
Open the valve connecting mistress, then can enter the inside room of osculum by mistress and fill degassed water.Then pressure chamber upper cover is installed, utilizes meter
Calculation machine carries out test and sets value.Wait to set value complete, open back pressure control valve 19 and pneumatic control valve 21 immediately, now by computer
Control gas pressure regulator and backpressure controllers can make sample 12 reach the matric suction value set after a certain time.Then root
According to matric suction balance Rule of judgment (in 24 hours the body of sample diminish in sample population long-pending 0.05%) can judge to inhale
Whether power reaches balance, after matric suction reaches balance, by carrying out ensuing to computer installation test procedure
Test.
Below in conjunction with accompanying drawing and technical scheme, the detailed description of the invention of the present invention is further described.Certainly our department
The description only present invention divided demonstrates and explains, and any equivalent transformation made according to technical scheme, all
Protection scope of the present invention should be belonged to.
Claims (7)
1. a unsaturated soil triaxial test matric suction fast balancing device, including sample cap (1) and pressure chamber base (2),
It is characterized in that: described sample cap (1) and pressure chamber base (2) are all built-in with hole air-pressure duct (16), pore water pressure
Pipeline (15) and back-pressure pipeline (14), described pressure chamber base (2) is all inlaid with the hole described in being connected with on sample cap (1)
Central column porous permeable stone (8) of air-pressure duct (16) and being positioned in described central column porous permeable stone (8) and with described
The high air-entry value pottery clay plates (7) that connects of pore water pressure pipeline (15) constitute double-drainage-gas extraction system；Described sample cap (1)
It is equipped with the spiral tank (3) being in below described high air-entry value pottery clay plates (7), described spiral tank in described
(3) one end is connected with described pore water pressure pipeline (15), and the other end is connected with described back-pressure pipeline (14)；Air pressure sensing
Device passes through with the hole air-pressure duct (16) on hole gas pressure regulator and described sample cap (1) and pressure chamber base (2)
Pneumatic control valve (21) connects, in described hole gas pressure regulator, described sample cap (1) and described pressure chamber base
(2) it is respectively arranged with minor valve on the hole air-pressure duct on；Back-pressure sensor and backpressure controllers and described sample cap
(1) the back-pressure pipeline (14) and in described pressure chamber base (2) is connected by back pressure control valve (19), in described back-pressure control
It is respectively arranged with minor valve on described back-pressure pipeline (14) in device processed, described sample cap (1) and pressure chamber base (2)；
The described pore water pressure pipeline (15) on described sample cap (1) and pressure chamber base (2) pore water by tee valve type
Pressure control valve (20) connects and is merged into a pipeline, connects pore water pressure and measures pipeline.
Unsaturated soil triaxial test matric suction fast balancing device the most according to claim 1, it is characterised in that: described
High air-entry value pottery clay plates (7), central column porous permeable stone (8), pressure chamber base (2) inner side and described spiral tank
(3) the very useful epoxy resin of groove is bound tightly together.
Unsaturated soil triaxial test matric suction fast balancing device the most according to claim 1 and 2, it is characterised in that:
The material of described central column porous permeable stone (8) is corrosion resistant plate with holes.
Unsaturated soil triaxial test matric suction fast balancing device the most according to claim 1 and 2, it is characterised in that:
The material of described sample cap (1) is lucite.
Unsaturated soil triaxial test matric suction fast balancing device the most according to claim 1 and 2, it is characterised in that:
The material of described pressure chamber base (2) is stainless steel material.
Unsaturated soil triaxial test matric suction fast balancing device the most according to claim 1 and 2, it is characterised in that:
Described pressure chamber base (2) and sample cap (1) inside are reservoir chamber (11), are full of degassed water, degasification in reservoir chamber (11)
Water contacts 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
Value pottery clay plates (7) bottom surface occurs that bubble hinders pore water to discharge and cause matric suction equilibration time to lengthen.
7. the method for use unsaturated soil triaxial test matric suction fast balancing device described in claim 1, its feature exists
In: 4 joints in pressure chamber base are connected with interior room, mistress, air pressure, back-pressure, then with supporting plastic tube respectively
Saturation pressure room base and high air-entry value pottery clay plates again, first before back-pressure pipeline and pore water pressure pipeline are connected to base respectively
Discharge the air in respective pipe, the most at a pressure, water is passed through from a union joint inlet opening and the row of spiral tank
Water hole flows to another union joint, does not has the union joint of pressure should be less than the water surface, gathers under high air-entry value pottery clay plates to rinse
Bubble, stay in time bubble be can't see by pipe, just stop, then, then turning around, such water just all flows in both direction；
After all there is no gas in guaranteeing back-pressure pipeline and pore water pressure pipeline, open back pressure control valve and pore water pressure control valve, logical
Crossing backpressure controllers and apply the little positive back-pressure bottom to high air-entry value pottery clay plates, bare maximum is 50KPa, allows and removes
Air water flows through the spiral tank saturation pressure room base under high air-entry value pottery clay plates and high air-entry value pottery clay plates, until high air-entry value
Emerge on pottery clay plates the continuous print globule, then turn off back pressure control valve and pore water pressure control valve；The highest air-entry value potter's clay
Plate is fully saturated and has and allows water pass freely through and limit the property that gas passes through, the most then by gradually promoting hole gas
Pressure, and control to be 0 to make sample become unsaturated state by pore water pressure with saturated high air-entry value pottery clay plates；
Treat pressure chamber base and high air-entry value pottery clay plates the most saturated after, wipe high air-entry value pottery clay plates end face with wet towel
Water, then ties fixing by the upper and lower side being cased with the sample of rubber membrane with sample cap and pressure chamber base respectively with rubber band；
Being attached with hole air-pressure duct by air inlet pipe plastic conduit, hole air-pressure duct is then by central column porous permeable stone
With sample contacts；Then install room in pressure chamber, water pump be connected to control by plastic conduit the valve of interior room plumbing,
Open the valve of room in connecting, then enter the inside room of osculum by interior room and fill degassed water；It is then shut off controlling the plumbing of interior room
Valve, is connected to the plastic conduit connecting water pump control the valve of mistress's plumbing, opens the valve connecting mistress, then pass through
Mistress enters the inside room of osculum and fills degassed water；Then pressure chamber upper cover is installed, utilizes computer to carry out test and set value；Wait to set value complete
Finish, open back pressure control valve and pneumatic control valve immediately, control gas pressure regulator now by computer and backpressure controllers is
Sample can be made after a certain time to reach the matric suction value set；Then Rule of judgment that is 24 according to matric suction balance are little
Time interior sample body diminish in sample population long-pending 0.05% can judge whether suction reaches balance, treat that matric suction reaches flat
After weighing apparatus, by computer installation test procedure can be carried out ensuing test.
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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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| 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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| CN109540680A (en) * | 2018-12-06 | 2019-03-29 | 长安大学 | A kind of Miniature tension meter is rapidly saturated device |
| 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 |
| CN112504862A (en) * | 2020-11-10 | 2021-03-16 | 中南大学 | Dynamic and static triaxial apparatus for controlling substrate suction and temperature |
| 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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| 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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