CN106644729A - Low-confining-pressure static and dynamic triaxial testing system based on MTS power source - Google Patents
Low-confining-pressure static and dynamic triaxial testing system based on MTS power source Download PDFInfo
- Publication number
- CN106644729A CN106644729A CN201610966777.2A CN201610966777A CN106644729A CN 106644729 A CN106644729 A CN 106644729A CN 201610966777 A CN201610966777 A CN 201610966777A CN 106644729 A CN106644729 A CN 106644729A
- Authority
- CN
- China
- Prior art keywords
- sample
- pressure
- confined pressure
- mts
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 81
- 230000003068 static effect Effects 0.000 title abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 57
- 239000011148 porous material Substances 0.000 claims description 31
- 230000005540 biological transmission Effects 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 22
- 229920001971 elastomer Polymers 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000012669 compression test Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a low-confining-pressure static and dynamic triaxial testing system based on a MTS power source, and belongs to the study field of geotechnical engineering. The low-confining-pressure static and dynamic triaxial testing system comprises a MTS tester and a triaxial testing device; the triaxial testing device comprises a pressure chamber, a measuring system and a confining pressure control system; the pressure chamber comprises a base, a side wall and a top plate; the measuring system comprises an electronic displacement meter, a radial deformation sensor and a force sensor; the side wall is in sealing connection with the base and the top plate; the force sensor is installed on the base, and a test sample is placed on the force sensor; the radial deformation sensor is plugged in the test sample; a test sample cap is arranged on the test sample, and the test sample cap is connected with a dowel steel; the dowel steel is connected with an actuator of the MTS tester by crossing through the top plate of the pressure chamber; the electronic displacement meter is installed on the dowel steel; the pressure chamber is connected with a confining pressure control system; confining pressure control system is used for providing stable confining pressure; the confining pressure medium is compression gas. The low-confining-pressure static and dynamic triaxial testing system solves the technical problem of unstable low confining pressure environment, big confining pressure difference and big measurement bias of the acting force at present.
Description
Technical field
The present invention relates to geotechnical study field, especially, is related to a kind of low confined pressure based on MTS power sources quiet dynamic three
Shaft experiment system.
Background technology
Triaxial test can effectively simulate the natural stress of the soil body, be to study the important test side of soil body mechanical property
Method.Static triarial test except can be used for determine the soil body intensive parameter c andOutward, it is additionally operable to soil body piezometer cone penetration test, oozes
Test and static side pressure ratio test etc. thoroughly；Dynamic triaxial tests can be used to studying fatigue resistance of the soil body under cyclic load,
Dynamic deformation and dynamic pore water pressure properties.Based on the soil body is quiet, dynamic triaxial tests achievements are to carry out soil constitutive model theoretical research, carry out
Numerical computations, the premise for solving the problems, such as Practical Project and basis.Therefore, Study on Triaxial Tests is subject to Ge great colleges and universities and scientific research institutions
Great attention, based on existing triaxial test system, by improving with exploitation to meet different tests condition, improve test essence
Degree and the important directions that effect is Study on Triaxial Tests and equipment development.
Existing domestic large-scale triaxial apparatus pressure chamber is most to be made using thick and heavy steel plate, the type balancing gate pit intensity
Greatly, larger confined pressure can be born, is primarily suitable for high confining pressure triaxial test, but be difficult to provide stable low confined pressure environment, it is difficult to
The low confined pressure soil body of accurate simulation actual loading situation (confined pressure of such as roadbed and foundation soil body is relatively low, typically 100kpa with
It is interior).In addition, existing domestic large-scale triaxial apparatus using water as confined pressure medium, the not phase of the confined pressure at sample differing heights
Together, especially for large-scale sample, when as samples height is 600mm, sample top, the confined pressure difference of bottom reach 6kpa, this
When, when sample confined pressure requires relatively low, during for example, 10kpa, sample top, bottom just have that the confined pressure of 6kpa is poor, and relative error is very big
The Treatment Analysis of test data are brought many difficulties by (up to 60%).Also, when confined pressure is hydraulic pressure, water is full of in pressure room,
This requires that the electric elements of direct test sample must possess water-proof function.Meanwhile, balancing gate pit side wall is opaque, it is impossible in test
During observe sample evolution.
What at present domestic large-scale triaxial apparatus can only be single carries out quiet three axle or dynamic triaxial tests, therefore to carry out quiet three axle
Two sets of testing equipments are needed with dynamic triaxial tests, experimentation cost is high.And, domestic large-scale dynamic triaxial tests system is difficult to meet
For a long time, the test requirements document (as railway bed will bear every year train effect number of times up to millions of times) of high shake frequency, and stress
Control accuracy it is undesirable.In addition, domestic many unit laboratories, are owned by MTS machines, if can utilize in rock-soil triaxial tests
Get up, can also improve the utilization rate of existing equipment, and MTS power and the control accuracy of displacement are very high.
Meanwhile, domestic existing large-scale dynamic triaxial tests system, force snesor is typically placed in the transmission rod outside pressure room
Top, therefore cannot measure and rubbed around transmission rod and sample cap weight itself and kinetic energy and transmission rod during power force
The amount of force produced to sample is wiped, so the numerical value of force snesor herein is considered as the power acted on sample, error is worked as
So can be very big.
The content of the invention
Present invention aim at provide a kind of low confined pressure based on MTS power sources quiet dynamic triaxial tests system, to solve mesh
Front low confined pressure environment is unstable, the technical problem that poor big, the Force measurement error of confined pressure is big.
For achieving the above object, the invention provides a kind of quiet dynamic triaxial tests system of low confined pressure based on MTS power sources,
Including MTS testing machines and Triaxial tester, it is characterised in that the Triaxial tester include balancing gate pit, measurement system and
Confined pressure control system, the balancing gate pit includes base, side wall and top board, and the measurement system includes electron displacement meter, radially becomes
Shape sensor and force snesor, the side wall is connected with base, top plate seal, and force snesor, the power are installed on the base
Inserting radial deformation sensor in sample, the sample is placed on sensor, the radial deformation sensor is along the vertical of sample
Lay in direction；Sample cap is set on the sample, and the sample cap connects transmission rod, top board of the transmission rod through balancing gate pit
It is connected with the actuator of MTS testing machines, the transmission rod arranges fairlead with top board junction, the electron displacement meter is arranged on
On transmission rod；The balancing gate pit connects confined pressure control system, and the confined pressure control system is used to provide stable confined pressure, confined pressure medium
For compressed gas.
Preferably, the side wall is connected by seal with base, top plate seal；Set between the force snesor and sample
Put lightweight balancing gate pit base.
Preferably, the side wall is transparent organic glass.
Preferably, the balancing gate pit is fastened the top board, side wall and base by screw rod.
Preferably, the lower end of the transmission rod is connected by spherical linkage with sample cap.
Preferably, the confined pressure control system includes air compressor, pressure storehouse and the constant-voltage equipment being sequentially connected, described
Constant-voltage equipment is connected by ambient pressure valve with the balancing gate pit.
Preferably, the upper and lower ends of the sample are respectively provided with porous disc and lower porous disc, the lower porous disc bottom
Pore water collection block is installed, the delivery port of the pore water collection block is connected by pore pressure valve with pore water measurement system
Connect.
Preferably, the Triaxial tester also includes back-pressure Force control system, extract system, the counter-pressure control system
System, extract system are connected by main pipe rail with sample, and one end of the flexible pipe is passed through the balancing gate pit and through the sample cap
Connect with sample, the other end of the main pipe rail arranges main valve.
Preferably, the back-pressure Force control system includes that pressue device, counter-pressure valve, body become pipe and draining valve, described to add
Pressure device is connected by the upper shed that counter-pressure valve becomes pipe with the body vertically laid, and the body becomes pipe built with liquid,
The body is become the under shed of pipe and is connected with flexible pipe by draining valve.
Preferably, the extract system includes vacuum extractor, breather valve, water column and water column valve, described to vacuumize
Device is connected by breather valve with the upper shed of the water column vertically laid, the under shed throughput water of the water column
Pipe valve is connected with flexible pipe.
Further, the water column is connected by water inlet pipe valve with pore water collection block.
The invention has the advantages that：
The quiet dynamic triaxial tests system of low confined pressure based on MTS power sources of the present invention, using the little tonnage starts of existing MTS
Device can apply the dynamic load of dead load or high circulation number of times as high-precision force source to the sample in balancing gate pit, realize quiet three axle
It is difunctional with dynamic triaxial tests；Confined pressure is air pressure, can provide stable low confined pressure to sample, realizes the low confined pressure of the simulation soil body
Force environment, confined pressure control accuracy is high；With compressed gas as confined pressure medium, confined pressure one of the sample along short transverse can be ensured
Cause, be particularly well-suited to low confined pressure, the sample of big height, confined pressure control accuracy is high, meanwhile, because abandoned being situated between as confined pressure with water
Matter, so being conducive to direct electric elements of installing around sample to be tested；In addition, force snesor is arranged on the bottom of balancing gate pit
On seat, overcome in traditional approach due to by force snesor be placed on transmission rod top, power force during transmission rod and
Friction etc. around sample cap weight itself and kinetic energy, transmission rod produces the defect that amount of force cannot be measured to sample, significantly
Reduce the measure error of active force.
Further, balancing gate pit side wall is made using the transparent organic glass cylinder of high intensity, conveniently observes and shoot with video-corder sample
State change.
Further, confined pressure control system includes air compressor, pressure storehouse and the constant-voltage equipment being sequentially connected, constant pressure dress
Put and be connected with balancing gate pit by ambient pressure valve, for balancing gate pit stable low confined pressure is provided.
Further, the upper and lower ends of sample are respectively provided with porous disc and lower porous disc, and lower porous disc bottom is provided with
Pore water collection block, the delivery port of pore water collection block is connected by pore pressure valve with pore water measurement system, can be measured
The pressure of sample pore water, in order to calculate the stressing conditions of sample in case there is a need.
Further, sample outside parcel rubber case, to maintain specimen shape, makes sample not loose.
Further, Triaxial tester also includes back-pressure Force control system, extract system, back-pressure Force control system, takes out
Gas system is connected by flexible pipe with sample, and one end of flexible pipe is passed through balancing gate pit and connects with sample through sample cap, flexible pipe it is another
One end arranges main valve, and back-pressure Force control system is used for require that fully saturated sample applies counter-pressure, extract system be used for be
The sample for requiring saturation is vacuumized, and disclosure satisfy that the requirement of different tests.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Description of the drawings
The accompanying drawing for constituting the part of the application is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is that the structure of the quiet dynamic triaxial tests system of low confined pressure in the preferred embodiment of the present invention based on MTS power sources is shown
It is intended to.
1st, reaction frame；2nd, MTS actuator；3rd, electron displacement meter；4th, top board；5th, side wall；6th, transmission rod；7th, fairlead；8、
Air bleeding valve；9th, sample cap；10th, upper porous disc；11st, sample；12nd, rubber case；13rd, lower porous disc；14th, lightweight balancing gate pit base；
15th, force snesor；16th, base；17th, ambient pressure valve；18th, pressure gauge；19th, pressure storehouse；20th, pore pressure valve；21st, water inlet pipe
Valve；22nd, draining valve；23rd, water column valve；24th, water column；25th, body becomes pipe；26th, counter-pressure valve；27th, breather valve；28th, main valve；
29th, radial deformation sensor；30th, screw rod；31st, air compressor；32nd, constant-voltage equipment.
Specific embodiment
Embodiments of the invention are described in detail below in conjunction with accompanying drawing, but the present invention can be limited according to claim
Multitude of different ways that is fixed and covering is implemented.
Referring to Fig. 1, the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources of the present embodiment, including MTS testing machines
And Triaxial tester, Triaxial tester include balancing gate pit, measurement system and confined pressure control system, balancing gate pit include base
16th, side wall 5 and top board 4, measurement system include electron displacement meter 3, radial deformation sensor 29 and force snesor 15, side wall 5 with
Base 16, top board 4 are tightly connected, and force snesor 15 is installed on base 16, and sample 11, the interpolation of sample 11 are placed on force snesor 15
Three radial deformation sensors 29 are filled, radial deformation sensor 29 is laid along the vertical direction of sample 11；Examination is set on sample 11
Sample cap 9, the connection transmission rod 6 of sample cap 9, transmission rod 6 is connected with the actuator 2 of MTS testing machines through the top board 4 of balancing gate pit, passes
Power bar 6 arranges fairlead 7 with the junction of top board 4, and electron displacement meter 3 is arranged on transmission rod 6；Balancing gate pit's connection confined pressure control system
System, confined pressure control system is used to provide stable confined pressure, and confined pressure medium is compressed gas, and the low confined pressure that should be based on MTS power sources is quiet
Dynamic triaxial tests system, by the use of the little tonnage actuator 2 of existing MTS as high-precision force source, can be to the sample 11 in balancing gate pit
Apply the dynamic load of dead load or high circulation number of times, realize that quiet three axle and dynamic triaxial tests are difunctional；Confined pressure is air pressure, can be right
Sample 11 provides stable low confined pressure, realizes the low confined pressure force environment of the simulation soil body, and confined pressure control accuracy is high；With compressed gas
For confined pressure medium, can ensure that sample 11 is consistent along the confined pressure of short transverse, be particularly well-suited to low confined pressure, the sample of big height,
Confined pressure control accuracy is high, meanwhile, because having abandoned with water as confined pressure medium, be conducive to directly installing around sample 11
Electric elements are tested；In addition, force snesor 15 is arranged on the base 16 of balancing gate pit, overcome in traditional approach due to inciting somebody to action
Force snesor 15 is placed on the top of transmission rod 6, transmission rod 6 and sample cap 9 weight itself and kinetic energy, biography during power force
The surrounding of power bar 6 friction etc. produces the defect that amount of force cannot be measured to sample 11, and the measurement for substantially reducing active force is missed
Difference.
In the present embodiment, side wall 5 is tightly connected by seal with base 16, top board 4, and seal is specially sealing gasket
Circle, it is ensured that balancing gate pit is air tight with the junction of base 16；Lightweight balancing gate pit base is set between force snesor 15 and sample 11
14, play a part of to link force snesor 15 and sample 11.
In the present embodiment, side wall 5 is the clear plexiglass cylinder of high intensity, can clearly observe and shoot with video-corder process of the test
The development and change of middle sample 11.
In the present embodiment, balancing gate pit passes through equally distributed four screw rods 30 by the top board 4, side wall 5 and base 16 pairs
Tense admittedly, make balancing gate pit more firm.
In the present embodiment, the lower end of transmission rod 6 is connected by spherical linkage with sample cap 9, transmission rod 6 is preferably driven
Load or displacement are passed to sample 11 by sample cap 9.
In the present embodiment, confined pressure control system includes air compressor 31, pressure storehouse 19 and the constant-voltage equipment being sequentially connected
32, constant-voltage equipment 32 is connected by ambient pressure valve 17 with balancing gate pit, and for balancing gate pit stable low confined pressure is provided.
In the present embodiment, the upper and lower ends of sample 11 are respectively provided with porous disc 10 and lower porous disc 13, lower porous disc 13
Bottom is provided with pore water collection block, and the delivery port of pore water collection block is connected by pore pressure valve 20 with pore water measurement system
Connect, the pressure of the pore water of sample 11 can be measured, in order to calculate the stressing conditions of sample 11 in case there is a need.
In the present embodiment, the outside of sample 11 parcel rubber case 12, to maintain specimen shape, makes sample not loose.
In the present embodiment, Triaxial tester also include back-pressure Force control system, extract system, back-pressure Force control system,
Extract system is connected by flexible pipe with sample 11, and one end of flexible pipe is passed through balancing gate pit and connects with sample 11 through sample cap 9, soft
The other end of pipe arranges main valve 28, and back-pressure Force control system is used for require that fully saturated sample 11 applies counter-pressure, pumping
System is used for the sample 11 to require saturation and vacuumizes, and disclosure satisfy that the requirement of different tests.
In the present embodiment, back-pressure Force control system includes that pressue device, counter-pressure valve 26, body become pipe 25 and draining valve 22,
Pressue device is connected by the upper shed that counter-pressure valve 26 becomes pipe 25 with the body vertically laid, and body becomes pipe 25 built with liquid
Body, body is become the under shed of pipe 25 and is connected with flexible pipe by draining valve 22；Extract system includes vacuum extractor, breather valve 27, amount
Water pipe 24 and water column valve 23, vacuum extractor is connected by breather valve 27 with the upper shed of the water column 24 vertically laid
Connect, the under shed throughput water pipe valve 23 of water column 24 is connected with main pipe rail, counter-force is passed through counter-pressure by back-pressure Force control system
Power is passed to body and becomes pipe 25 by valve 26, and body is become liquid in pipe 25 and entered in sample 11 by draining valve 22；Extract system is by logical
Air valve 27 is connected with water column 24, and again throughput water pipe valve 23 is connected water column 24 with sample 11.
In the present embodiment, water column 24 is connected by water inlet pipe valve 21 with pore water collection block, in order to measure pore water
The Volume Changes of pressure.
In the present embodiment, lightweight balancing gate pit base 14, base 16 and lightweight balancing gate pit base 14 are set on force snesor 15
Between be provided with pipeline connection sample 11 and pore water pressure Force system, while connecting water column 24, saturation can be provided to sample 11
Water or draining；Base 16 also by flexible pipe through sample cap 9 connect sample 11, and by flexible pipe connect back-pressure Force control system and
Extract system connects, and can vacuumize and provide back-pressure to the sample 11 for requiring saturation, and the top board 4 of balancing gate pit is provided with air bleeding valve 8.
The sample preparation and installation of the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources of the present embodiment：
The base 16 of balancing gate pit is separated with balancing gate pit, is pressed in pressure chamber base 16《Earthwork test rule》Sample preparation is required
Sample preparation, the various pieces of instrument are connected with each other, and in the present embodiment, test soil sample is large-scale sample, and sample 11 is shaped as cylinder
Shape, is highly 300mm～600mm, a diameter of 150mm～300mm.
1. press《Earthwork test rule SL237-1999》Regulation prepares soil sample.According to dry density, moisture content, volume of sample and
Number once gets the soil sample needed for battery of tests ready, and the quality of soil sample weighed required for each sample is standby；
2. the lower end of rubber case 12 is enclosed within lightweight balancing gate pit base 14 and with rubber band and is tightened, in the outer sheath of rubber case 12
The split punching block of upper two-flap type, has fastened connecting screw rod 30.Rubber case 12 is extracted out and by other end inversion boot in steel from punching block
Mould upper end.
3. permeable packing paper (being made up of permeable geotextiles) is installed under the balancing gate pit in punching block on porous disc 13；
4. the soil sample of each sample is divided into into 3～5 deciles, divides 3 layers or 5 layers and insert rubber case 12.With hammering reality or pressure
Machine is compacted, and after the 1st layer of soil sample compacting, its surface should dig hair, then add the 2nd layer of soil sample compacting.Other each layers are compacted with same method,
Every layer of soil sample should be densified to predetermined altitude.
5. split punching block is removed, specimen finish D0 and height H0 is determined, permeable packing paper, upper porous disc 10, examination is put successively
Sample cap 9, puts rubber case 12, and it is tightened with sample cap 9.The flexible pipe of connection sample cap 9 and base.
6. connect balancing gate pit inside force snesor 15, radial deformation sensor 29, balancing gate pit's top board 4 is installed, connect pressure
Outdoor gas-charging connection, sensor connector (including plug), install electron displacement meter 3.
The quiet dynamic triaxial tests system of low confined pressure based on MTS power sources of the present embodiment, during operation：
(1) sample saturation
1. it is evacuated saturation：Close pore pressure valve 20, water inlet pipe valve 21, draining valve 22, main valve 28, opening water pipe valve 23
With breather valve 27, start extract system, after close 1 atmospheric pressure, last about 1h.Water column valve 23 is closed, water inlet pipe is opened
Valve 21, sample 11 carries out saturation.
2. counter-pressure saturation：If need counter-pressure saturation, sample 11 is installed on behind balancing gate pit, first to reversed Stress control
The body of system becomes water filling in pipe 25, surveys note body and becomes the liquid level readings of pipe 25, then applies 30kPa by confined pressure control system to examination, 11
Ambient pressure, open pore pressure valve 20, survey the stable reading of note pore pressure.Close breather valve 27, open counter-pressure valve 26,
By pressue device and confined pressure control system sample 11 and the classification of the surrounding of sample 11 are exerted pressure respectively simultaneously, during applying,
Every grade of increment for remaining ambient pressure 30kPa bigger than counter-pressure, counter-pressure and ambient pressure is 20kPa, treats pore pressure
After stable, survey note pore pressure and body becomes the reading of pipe 25, next stage ambient pressure and counter-pressure are then applied again, until saturation degree
Till 0.95.
(2) confined pressure is applied
Confined pressure requirement according to needed for test, by compressed air balancing gate pit is input to, and to sample confined pressure is applied.
(3) xial feed is applied
Axial loading system is opened, according to test requirements document, loading parameter is arranged by the control software of MTS systems, to sample
Apply xial feed, carry out quiet three axle or dynamic triaxial tests, test is stopped according to test stopping criterion.
Reaction frame 1 constitutes axial loading system with above-mentioned MTS testing machines, actuator 2, transmission rod 6 and sample cap 9.MTS is tried
Machine is tested by control software, stable dead load (greatest axis pressure is 50kN) can be provided, high accuracy Variable Amplitude can be also provided, answered
Clutter shape (rectangular wave, sine wave), multi-frequency (0～20Hz), the dynamic load of high shake frequency (>=10 ten thousand times), and can be in high shake frequency
In the case of realize high-precision load or displacement output, and can continuously record load, displacement, time data simultaneously.MTS actuator
2 are fixed on the crossbeam lower surface center of reaction frame 1, and the supporting control software of MTS actuator 2 is used to control the dynamic load of MTS outputs
Or dynamic displacement, and the load of output, displacement and time data are automatically recorded in the storage disk of control software, so as to MTS works
By being further applied load to transmission rod 6, transmission rod 6 can be made dynamic device 2 along the vertical art skating of fairlead 7, the upper end of transmission rod 6 with MTS
Electron displacement meter 3 is installed, the top of transmission rod 6 contacts with MTS actuator 2 during test between dynamic device 2, the lower end of transmission rod 6
Spherical convex shape is made, with the spherical linkage that the sample cap 9 for making concave shape collectively forms activity, load or displacement examination is passed to into
Sample 11.Load is provided by the supporting pressure system that MTS actuator 2 connects.Load output control is by the supporting control of MTS testing machines
Software is controlled and output result is stored in storage dish.
Wherein, the storage device of MTS testing machines control system is used to measuring and recording the power that MTS actuator 2 is vertically exported
And displacement；Electron displacement meter 3 is used to measure the axial deformation of sample 11；Pore water measurement system is used to measure process of the test pilot scale
The pore water pressure of sample 11；Radial deformation sensor 29 is installed on the cross section of sample 11 middle part, for measuring the radial direction of sample 11
Deformation；Force snesor 15, is placed between lightweight balancing gate pit base 14 and base 16, for measuring the pressure that sample 11 is subject to；
Body becomes the Volume Changes after the measurement sample 11 of pipe 25 compresses.
The quiet dynamic triaxial tests system of low confined pressure based on MTS power sources of the present embodiment, can carry out various different tests bars
The triaxial compression test of part, including different consolidation pressures, moisture content, compactness, frequency, dynamic stress, waveform etc.；Difference can be carried out
The circulation dynamic load or the quiet triaxial compression test of strain controlling of great soil group sample, including rubble, coarse-grained soil containing mud, silt, clay
Deng；High accuracy, stable dynamic load can be exported in the case of long-time, high shake frequency.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the quiet dynamic triaxial tests system of a kind of low confined pressure based on MTS power sources, including MTS testing machines and Triaxial tester,
Characterized in that, the Triaxial tester includes balancing gate pit, measurement system and confined pressure control system, the balancing gate pit includes bottom
Seat, side wall and top board, the measurement system includes electron displacement meter, radial deformation sensor and force snesor, the side wall with
Base, top plate seal connection, install force snesor on the base, sample, the sample interpolation are placed on the force snesor
Dress radial deformation sensor, the radial deformation sensor is laid along the vertical direction of sample；Sample cap is set on the sample,
The sample cap connects transmission rod, and the transmission rod is connected through the top board of balancing gate pit with the actuator of MTS testing machines, the biography
Power bar arranges fairlead with top board junction, and the electron displacement meter is arranged on transmission rod；The balancing gate pit connects confined pressure control
System processed, the confined pressure control system is used to provide stable confined pressure, and confined pressure medium is compressed gas.
2. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 1, it is characterised in that institute
State side wall to be connected with base, top plate seal by seal；Lightweight balancing gate pit base is set between the force snesor and sample.
3. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 1, it is characterised in that institute
Side wall is stated for transparent organic glass.
4. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 1, it is characterised in that institute
State balancing gate pit to fasten the top board, side wall and base by screw rod.
5. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 1, it is characterised in that institute
The lower end for stating transmission rod is connected by spherical linkage with sample cap.
6. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 1, it is characterised in that institute
Air compressor, pressure storehouse and constant-voltage equipment that confined pressure control system includes being sequentially connected are stated, the constant-voltage equipment passes through surrounding
Pressure valve is connected with the balancing gate pit.
7. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 1, it is characterised in that institute
The upper and lower ends for stating sample are respectively provided with porous disc and lower porous disc, and the lower porous disc bottom is provided with pore water collection
Seat, the delivery port of the pore water collection block is connected by pore pressure valve with pore water measurement system.
8. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to any one of claim 1～7, its
It is characterised by, the Triaxial tester also includes back-pressure Force control system, extract system, the back-pressure Force control system, takes out
Gas system is connected by flexible pipe with sample, and one end of the flexible pipe is passed through the balancing gate pit and connects with sample through the sample cap
Logical, the other end of the flexible pipe arranges main valve.
9. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 8, it is characterised in that institute
State back-pressure Force control system and become pipe and draining valve including pressue device, counter-pressure valve, body, the pressue device passes through counter-pressure valve
The upper shed for becoming pipe with the body vertically laid is connected, and the body becomes pipe built with liquid, and the body becomes the under shed of pipe
It is connected with flexible pipe by draining valve.
10. the quiet dynamic triaxial tests system of the low confined pressure based on MTS power sources according to claim 8, it is characterised in that institute
Extract system is stated including vacuum extractor, breather valve, water column and water column valve, the vacuum extractor is by breather valve and edge
The upper shed connection of the water column that vertical direction is laid, the under shed throughput water pipe valve of the water column is connected with flexible pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610966777.2A CN106644729A (en) | 2016-10-28 | 2016-10-28 | Low-confining-pressure static and dynamic triaxial testing system based on MTS power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610966777.2A CN106644729A (en) | 2016-10-28 | 2016-10-28 | Low-confining-pressure static and dynamic triaxial testing system based on MTS power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106644729A true CN106644729A (en) | 2017-05-10 |
Family
ID=58821476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610966777.2A Pending CN106644729A (en) | 2016-10-28 | 2016-10-28 | Low-confining-pressure static and dynamic triaxial testing system based on MTS power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106644729A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024388A (en) * | 2017-05-16 | 2017-08-08 | 潍坊学院 | Domestic waste soil three axis creep test instrument, preparation method and application method |
| CN107449678A (en) * | 2017-09-12 | 2017-12-08 | 中国地质科学院地质力学研究所 | Large-scale triaxial shear test devices and methods therefor in situ |
| CN108489799A (en) * | 2018-02-27 | 2018-09-04 | 中国科学院武汉岩土力学研究所 | A kind of three axis of rock gas/naked triaxial compression test device, system and method |
| CN109580398A (en) * | 2018-10-26 | 2019-04-05 | 华侨大学 | A kind of test method of rock dynamic creep |
| CN109752306A (en) * | 2019-03-22 | 2019-05-14 | 中国科学院武汉岩土力学研究所 | Dynamic load perturbation process rock permeability test method and its test macro |
| CN110095347A (en) * | 2019-05-05 | 2019-08-06 | 三峡大学 | Three axis tensilometer of strain controlling formula unsaturated soil |
| CN110108571A (en) * | 2019-06-06 | 2019-08-09 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | A kind of experimental rig and test method of coupled static-dynamic loadingi |
| CN110261231A (en) * | 2019-06-12 | 2019-09-20 | 西安理工大学 | A kind of quiet dynamic triaxial tests device of temperature control based on MTS power source |
| WO2020119394A1 (en) * | 2018-12-11 | 2020-06-18 | 大连理工大学 | Ct triaxial test device for hydrate sediments |
| CN112378793A (en) * | 2020-12-07 | 2021-02-19 | 中南大学 | Variable-confining pressure dynamic triaxial tester with bidirectional power loading function |
| CN112504862A (en) * | 2020-11-10 | 2021-03-16 | 中南大学 | Dynamic and static triaxial apparatus for controlling substrate suction and temperature |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579003A (en) * | 1985-01-22 | 1986-04-01 | Riley Brodie D | Instrument for testing earthen samples under triaxial load conditions |
| US4825700A (en) * | 1988-06-15 | 1989-05-02 | Regents Of The University Of Minnesota | Bi-axial geomaterial test system |
| US20040244497A1 (en) * | 2001-03-20 | 2004-12-09 | Abdel-Hadi Ali Ismail | Enhanced triaxial tester with volume change device for measurement of flow properties of dry cohesive particulate systems under low confining pressures |
| CN101718659A (en) * | 2009-12-09 | 2010-06-02 | 中国矿业大学 | Device and method for testing coefficient of static earth pressure |
| CN103674736A (en) * | 2013-12-18 | 2014-03-26 | 水利部交通运输部国家能源局南京水利科学研究院 | Large triaxial shear testing instrument for rockfill material degradation |
| CN104155427A (en) * | 2014-08-08 | 2014-11-19 | 王平 | Low back pressure saturation method for loess liquidation experiment |
| CN104165797A (en) * | 2014-08-29 | 2014-11-26 | 上海交通大学 | Pile-soil interface three-axis model testing device under condition of seepage |
| CN204086017U (en) * | 2014-09-29 | 2015-01-07 | 湖南科技大学 | A kind of rock twin shaft unloader test device |
| CN105527175A (en) * | 2016-01-22 | 2016-04-27 | 湘潭大学 | Soil engineering triaxial shear test equipment based on MTS electro-hydraulic servo tester |
| CN206095802U (en) * | 2016-10-28 | 2017-04-12 | 中南大学 | Low quiet dynamic triaxial test system of confined pressure based on MTS power supply |
-
2016
- 2016-10-28 CN CN201610966777.2A patent/CN106644729A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579003A (en) * | 1985-01-22 | 1986-04-01 | Riley Brodie D | Instrument for testing earthen samples under triaxial load conditions |
| US4825700A (en) * | 1988-06-15 | 1989-05-02 | Regents Of The University Of Minnesota | Bi-axial geomaterial test system |
| US20040244497A1 (en) * | 2001-03-20 | 2004-12-09 | Abdel-Hadi Ali Ismail | Enhanced triaxial tester with volume change device for measurement of flow properties of dry cohesive particulate systems under low confining pressures |
| CN101718659A (en) * | 2009-12-09 | 2010-06-02 | 中国矿业大学 | Device and method for testing coefficient of static earth pressure |
| CN103674736A (en) * | 2013-12-18 | 2014-03-26 | 水利部交通运输部国家能源局南京水利科学研究院 | Large triaxial shear testing instrument for rockfill material degradation |
| CN104155427A (en) * | 2014-08-08 | 2014-11-19 | 王平 | Low back pressure saturation method for loess liquidation experiment |
| CN104165797A (en) * | 2014-08-29 | 2014-11-26 | 上海交通大学 | Pile-soil interface three-axis model testing device under condition of seepage |
| CN204086017U (en) * | 2014-09-29 | 2015-01-07 | 湖南科技大学 | A kind of rock twin shaft unloader test device |
| CN105527175A (en) * | 2016-01-22 | 2016-04-27 | 湘潭大学 | Soil engineering triaxial shear test equipment based on MTS electro-hydraulic servo tester |
| CN206095802U (en) * | 2016-10-28 | 2017-04-12 | 中南大学 | Low quiet dynamic triaxial test system of confined pressure based on MTS power supply |
Non-Patent Citations (4)
| Title |
|---|
| 崔希海: "岩石流变扰动效应及试验***研究", 中国博士毕业论文数据库, 15 June 2008 (2008-06-15), pages 82 - 83 * |
| 燕碧华: "浅谈室内土工试验的试样饱和", 《西部探矿工程》, pages 22 * |
| 王军: "膨胀土裂隙特性及其对强度影响的研究", 中国优秀硕士毕业论文数据库, 15 March 2011 (2011-03-15), pages 60 * |
| 邹维列 等: "低围压水平下QH-E 模拟月壤三轴试验技术与力学特性", 岩土工程学报, vol. 37, no. 8, 31 August 2015 (2015-08-31), pages 1418 - 1425 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024388A (en) * | 2017-05-16 | 2017-08-08 | 潍坊学院 | Domestic waste soil three axis creep test instrument, preparation method and application method |
| CN107024388B (en) * | 2017-05-16 | 2024-02-20 | 潍坊学院 | Triaxial creep tester for urban household garbage soil, manufacturing method and using method |
| CN107449678A (en) * | 2017-09-12 | 2017-12-08 | 中国地质科学院地质力学研究所 | Large-scale triaxial shear test devices and methods therefor in situ |
| CN108489799A (en) * | 2018-02-27 | 2018-09-04 | 中国科学院武汉岩土力学研究所 | A kind of three axis of rock gas/naked triaxial compression test device, system and method |
| CN109580398A (en) * | 2018-10-26 | 2019-04-05 | 华侨大学 | A kind of test method of rock dynamic creep |
| US11215569B2 (en) | 2018-12-11 | 2022-01-04 | Dalian University Of Technology | CT triaxial test apparatus for hydrate-bearing sediment |
| WO2020119394A1 (en) * | 2018-12-11 | 2020-06-18 | 大连理工大学 | Ct triaxial test device for hydrate sediments |
| AU2019399653B2 (en) * | 2018-12-11 | 2021-02-04 | Dalian University Of Technology | CT triaxial test device for hydrate sediments |
| CN109752306A (en) * | 2019-03-22 | 2019-05-14 | 中国科学院武汉岩土力学研究所 | Dynamic load perturbation process rock permeability test method and its test macro |
| CN110095347A (en) * | 2019-05-05 | 2019-08-06 | 三峡大学 | Three axis tensilometer of strain controlling formula unsaturated soil |
| CN110095347B (en) * | 2019-05-05 | 2022-02-01 | 三峡大学 | Strain control type unsaturated soil three-axis stretching instrument |
| CN110108571A (en) * | 2019-06-06 | 2019-08-09 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | A kind of experimental rig and test method of coupled static-dynamic loadingi |
| CN110108571B (en) * | 2019-06-06 | 2024-02-02 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Dynamic and static combined loading test device and test method |
| CN110261231A (en) * | 2019-06-12 | 2019-09-20 | 西安理工大学 | A kind of quiet dynamic triaxial tests device of temperature control based on MTS power source |
| CN112504862A (en) * | 2020-11-10 | 2021-03-16 | 中南大学 | Dynamic and static triaxial apparatus for controlling substrate suction and temperature |
| CN112378793A (en) * | 2020-12-07 | 2021-02-19 | 中南大学 | Variable-confining pressure dynamic triaxial tester with bidirectional power loading function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106644729A (en) | Low-confining-pressure static and dynamic triaxial testing system based on MTS power source | |
| CN203216804U (en) | Uniaxial rock compression creepmeter in dry-wet circulating process | |
| CN106990031A (en) | Coal seam containing gas Percolation Law experimental study method under one kind vibration Excavation | |
| CN105203410B (en) | A kind of experimental rig for being used to measure rock shearing creep properties | |
| CN102809641B (en) | Undisturbed soil sample expansion force testing device capable of controlling saturation | |
| Imbert et al. | Hydro-mechanical response of a bentonite pellets/powder mixture upon infiltration | |
| CN104677807B (en) | A kind of large scale soil sample true triaxial seepage characteristic and strength test device | |
| CN206095802U (en) | Low quiet dynamic triaxial test system of confined pressure based on MTS power supply | |
| CN103234830B (en) | Anchoring property experiment platform of anchor rod | |
| CN108344675A (en) | Coal body adopts the test method of permeation fluid mechanics rule under the conditions of simulation protective coat extracted | |
| CN206593982U (en) | A kind of rock mass swelling stress tester | |
| CN106124316B (en) | The anisotropic indoor true triaxial test method of bulk solid rock-soil material | |
| Eseller-Bayat et al. | Undrained dynamic response of partially saturated sands tested in a DSS-C device | |
| CN107101871A (en) | The ess-strain control formula geotechnical centrifuge model system of complete off-load | |
| Jiang et al. | Effect of cyclic loading frequency on dynamic properties of marine clay | |
| CN109765109A (en) | Soft Soil Layer pile foundation quasi-Pascal effect experimental rig | |
| CN106644880A (en) | Seepage air pressure consolidation apparatus | |
| CN201724733U (en) | Shear wave velocity detector for triaxial apparatus | |
| CN218937995U (en) | Novel lateral limit compression test device for simulating true stress state of soil | |
| CN116465971A (en) | Acoustic emission triaxial erosion test device for gravel soil and test method thereof | |
| CN110528602A (en) | Earth lateral pressure experiment simulator under diaphram wall difference level of ground water operating condition | |
| CN206906169U (en) | The experimental rig of resistance to shear of soil relaxation and deformation under a kind of monitoring drying and watering cycle | |
| Reis et al. | Performance of a cubical triaxial apparatus for testing saturated and unsaturated soils | |
| CN102200496A (en) | Indoor middle-sized shear test method for reconstituted soil, and special equipment thereof | |
| CN209372612U (en) | A kind of small-sized high frequency and low stress width soil dynamic triaxial apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |