CN205826491U - A kind of multi-boundary Condition dilatometer - Google Patents
A kind of multi-boundary Condition dilatometer Download PDFInfo
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- CN205826491U CN205826491U CN201620581929.2U CN201620581929U CN205826491U CN 205826491 U CN205826491 U CN 205826491U CN 201620581929 U CN201620581929 U CN 201620581929U CN 205826491 U CN205826491 U CN 205826491U
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- 238000012360 testing method Methods 0.000 claims abstract description 44
- 238000004088 simulation Methods 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 26
- 238000013461 design Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 20
- 230000000694 effects Effects 0.000 description 10
- 238000010998 test method Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000011068 loading method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000005213 imbibition Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
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- 238000002474 experimental method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 241001080929 Zeugopterus punctatus Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
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- 238000013500 data storage Methods 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
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Abstract
The utility model discloses a kind of multi-boundary Condition dilatometer, including lower support platform, top fixed frame, boundary condition imitation mechanism, load sample room and measuring mechanism, described top fixed frame, boundary condition imitation mechanism, load sample room are installed on lower support platform, and measuring mechanism is arranged in the fixed frame of top.The rigidity flexible boundary analogue units such as this utility model devises, are integrated with constant volume and constant stress boundary condition simulation unit simultaneously, compared with traditional expansion instrument, can test under many arbitrary boundary conditions, analyze the boundary condition impact on soil expansion performance；And this utility model can design different tests path, analyze the test routine impact on soil expansion performance；Have employed sense measuring device and data acquisition unit, measuring accuracy is high, and data acquisition is convenient；Apparatus structure is the most novel, easy and simple to handle, is affected by human factors little, low cost, and data are reliable.
Description
Technical field
This utility model belongs to Geotechnical Engineering and laboratory test technical field in Geological Engineering, more particularly, it relates to one
Kind can simulate various boundary (constant stress, constant volume and etc. rigidity) and can the dilatometer in free design experiment path and soil
Volume expansion test method.
Background technology
The dilatancy soil body is widely distributed in the regional in the world.Due to the restriction in geographical position, many buildings are not
Obtain and be not built on ground based on the dilatancy soil body.In recent years, under the influence of extreme climate, because soil body imbibition deforms
The engineering accident causing foundation failure to produce often occurs, and people's property safety is caused strong influence.On the contrary, utilize swollen
The special nature of the swollen property soil body, the buffering/backfilling material based on bentonite can also be used at refuse landfill, nuclear waste geology
Putting in the leakage preventing structure of the special engineerings such as storehouse, the impact of engineering structure be can not be ignored by the expansive force produced under this operating mode.Cause
This, in recent years about the expansion characteristics of the soil body and the most accurately measure the expansion index of the soil body and receive many ground and geology work
The attention of journey field scholar.
At present, soil expansion performance is studied and is mainly carried out one-dimensional expansion examination under the conditions of the ideal boundary supposed by educational circles
Test.Conventional test method can be attributed to following three kinds: (1) constant volume method；(2) constant stress method；(3) expansion-load balance
Method.Wherein, constant volume method includes rigidity room method and load balance method, and rigidity room method is mainly by axial to sample of rigid structure
Dilatancy limits, and utilizes sensor to measure expansive force；Load balance rule is by constantly applying axle to sample
To load, keep its axial deformation constant, calculate accumulation load thus obtain expansive force；Constant stress method is to apply one to sample
Constant xial feed so that it is imbibition under this stress, utilizes dial gauge to measure its expansion rate；Expand-load
Balance rule the most first makes sample carry out free wxpansion, measures expansion rate, multistage loadings compression again after sample deformation is stable, with
This draws compression curve and determines corresponding expansive force according to initial void ratio.
Generally speaking, above several method is utilized the expansion characteristics of the soil body can be carried out a certain degree of understanding.But,
Above-mentioned method of testing main analog two kinds of extreme boundary conditions, i.e. constant stress condition and constant volume condition, obtained is swollen
Swollen index also cannot reflect the real expansion character of the soil body.It is true that in actual ground, Geological Engineering environment, be in not
The soil body of co-located all can corresponding different boundary condition, in addition to above-mentioned constant volume with constant stress border, also countless versions with
The flexible boundary condition that the rigidity of structure is relevant.And traditional expansion test method is only capable of constant stress or two kinds of extreme limits of constant volume
Boundary's condition is simulated, and acquired results is the most very limited to the reference value of Practical Project.Therefore, improve expansion test method,
Grasping the expansion characteristics of the soil body under various boundary, engineering Geological Characteristics and guidance to rational evaluation swelled ground expand soil
The engineering practice in district has most important theories meaning and realistic meaning.
In traditional test method, expansion test typically utilizes consolidation apparatus to complete, and there are some not in method of testing
In place of foot.In the method for rigidity room, the most only by sensor, the expansive force of sample is measured, and to limiting structure in process of the test
In whether deform and typically do not consider, when testing the higher sample of dry density, owing to expansive force is higher, limiting structure produces
Raw elastic deformation is considerable；In load balance method, by constantly loading the axial deformation of Control Assay, the method is not only
Complex operation, and it is difficult to ensure that volume of sample is constant；In constant stress method, when initial load is too high, hold very much at the test initial stage
Easily causing sample compression, the expansion rate recorded under the conditions of being somebody's turn to do is inevitable not to be inconsistent with truth.In addition, it is contemplated that over time
Migration, the residing in the environment boundary condition of the soil body also can change, and the flexible boundary condition such as some position can be along with
The increase of deformation is changed into constant volume border, and constant stress boundary condition is constant volume border as well as the increase transition of load
Deng.The expansion character of the soil body will necessarily be impacted by the change of boundary condition, and these problems used to be left in the basket, also without
Method utilizes traditional instrument and equipment to study.
In sum, the instrument used in the outer expansion test of Present Domestic is primarily present following deficiency:
(1) constant stress and two kinds of extreme boundary conditions of constant volume are only accounted for, and to Practical Project is widely present
Flexible boundary condition lacks consideration；
(2) conventional Boundary Condition Control method operation complexity, is easily affected by human factors；
(3) cannot transform boundary condition in process of the test.
Through retrieval, Chinese Patent Application No. 201510322064.8, filing date on June 2nd, 2015, invention and created name
For: swelled ground two-dimensional swelling instrument；This application case includes testing stand and the pressure chamber being arranged on testing stand, and pressure chamber is by up and down
The square tubulose of the left and right both ends open that the base plate of alternate setting, top board and the front plate of forward and backward alternate setting, rear plate surround
Structure, the space jointly surrounded between two side guides, increased pressure board, base plate, front plate and rear plate constitutes the receiving of test soil sample
Space, slide mechanism is connected with the load maintainer being arranged on testing stand through flexible strand, and pressure transmission plate is provided with for measuring it
First displacement transducer of vertical displacement, dowel steel is provided with the second displacement sensor for measuring its horizontal displacement；Should
Application case is a kind of swelled ground two-dimensional swelling instrument, can effectively solve dilatometer and record the expansion of vertical and lateral both direction simultaneously
Deformation and the problem of expansive force；But this application case can not change the boundary condition residing for sample, and it is (permanent to realize many arbitrary boundary conditions
Pressure, constant volume and etc. rigidity) any conversion, still need to improve further.
Therefore, develop and develop a kind of easy and simple to handle, stable performance, measurement convenience, reliable results, be applicable to multiple border
Condition and can realize the expansion-pressure testing apparatus of different boundary conversion, to the expansion characteristics of the further investigation soil body with instruct Geotechnical Engineering real
Trample significant.
Utility model content
1. utility model to solve the technical problem that
In order to overcome the deficiency using instrument to exist in the outer expansion test of Present Domestic, it is many that this utility model provides one
Boundary condition dilatometer；This utility model devises a kind of flexible boundary analog based on ring of measuring one's own ability, at integrating traditional
On the basis of constant stress, constant volume boundary condition imitation mechanism, three arbitrary boundary conditions can be carried out and freely switch, it is possible to use displacement
The expansion rate under various boundary and expansive force, the boundary condition shadow to soil expansion performance is accurately measured with pressure transducer
Ring and the test routine impact on expansion character；The more conventional expansion-pressure testing apparatus of this instrument is integrated with three arbitrary boundary conditions moulds simultaneously
Intend mechanism, add boundary condition shifter and high-precision displacement and pressure transducer, there is preferable measuring accuracy, dress
Put simple structure, easy to operate.
2. technical scheme
For reaching the purpose of above-mentioned utility model, solving problem present in existing method of testing, this utility model is adopted
Use following technical scheme:
A kind of multi-boundary Condition dilatometer of the present utility model, including lower support platform, top fixed frame and load sample
Room, lower support platform supports top fixed frame, and load sample room is placed in inside the fixed frame of top, also includes boundary condition imitation
Mechanism and measuring mechanism, described boundary condition imitation mechanism includes constant volume boundary condition simulation unit, constant stress module of boundary endorsement
Unit and etc. rigidity flexible boundary analogue unit, can for test needed for boundary condition, it is achieved freely cutting of three kinds of boundary condition simulations
Change；Test desired parameters is measured by described measuring mechanism.
Further, described top fixed frame includes steady brace, the first adjusting nut and rigid plate, fixes and draws
Bar lower end is fixed with lower support platform, and upper end is connected with rigid plate by the first adjusting nut, and the first adjusting nut regulation is just
Property plate is completely fixed, only moves up, only moves down or move freely.
Further, described constant volume boundary condition simulation unit includes that U-shaped limits pull bar and the second adjusting nut, U-shaped
Limit pull bar upper end to be connected through rigid plate with the second adjusting nut.
Further, described constant stress boundary condition simulation unit includes a charger, and this charger includes counterweight
Hanging scaffold, leverage, counterweight, eccentric shaft and loading pull bar, wherein, load pull bar upper end and fix with rigid plate, and lower end is passed through
Eccentric shaft is connected with leverage；Counterweight hanging scaffold is connected with leverage front end, is used for placing counterweight and loads；Counterweight with
Leverage rear end connects, for charger is carried out initial leveling.
Further, the rigidity flexible boundary analogue unit such as described includes measuring one's own ability ring and adjusting rod, and ring of measuring one's own ability is installed
Limiting inside pull bar in U-shaped, the lower end of ring of measuring one's own ability limits with U-shaped and contacts bottom pull bar, and upper end contacts with adjusting rod；Adjusting rod is worn
Crossing rigid plate, adjusting rod moves up and down decision and measures one's own ability ring whether stress.
Further, described measuring mechanism includes pressure transducer, the first displacement transducer, the second displacement sensing
Device, overcasting staff and data acquisition unit；Pressure transducer top and U-shaped limit pull bar and fix；First displacement transducer is installed
Limit bottom pull bar in U-shaped, and contact with overcasting staff；Second displacement sensor is installed on U-shaped and limits in the middle part of pull bar；Data acquisition
Acquisition means is connected, for automatically gathering data in process of the test and storing by wire and three sensors.
This utility model utilizes the method that multi-boundary Condition dilatometer carries out soil expansion test, can for test needed for
Boundary condition, it is achieved constant volume boundary condition simulation, constant stress boundary condition simulation and etc. rigidity flexible boundary simulation freely switch；Its
In,
The control mode of constant volume boundary condition simulation is, controls the first adjusting nut and the second adjusting nut for fixing shape simultaneously
State；
The control mode of constant stress boundary condition simulation is, controlling the first adjusting nut is active state, and the second adjusting nut is
Stationary state；
It is that controlling the first adjusting nut is stationary state etc. the control mode of rigidity flexible boundary simulation, the second regulation spiral shell
Mother is active state.
Further, the concrete operations of simulation constant volume boundary condition are: first control the first adjusting nut, make rigid plate
It is fixed on steady brace, then controls the second adjusting nut, make U-shaped limit pull bar and fix with rigid plate；Now, rigid plate and
U-shaped limits pull bar and is controlled geo-stationary by the second adjusting nut, and rigid plate is controlled to move by the first adjusting nut simultaneously, permanent
Volume borders condition is reached；
The concrete operations of simulation constant stress boundary condition are: first control the first adjusting nut movable, make rigid plate along solid
Determine pull bar to slide up and down；Then control the second adjusting nut, make U-shaped limit pull bar and fix with rigid plate；Hammered into shape by adjustment
Make charger initial balance, finally according to default axial stress, in counterweight hanging scaffold, add counterweight, constant stress boundary condition
Reach；
The concrete operations of the rigidity flexible boundary conditions such as simulation are: first control the first adjusting nut, make top fixed frame
Fixing；Then control the second adjusting nut, make U-shaped limit pull bar the most movable；Controlling to adjust bar again, the ring that makes to measure one's own ability is distinguished up and down
Limiting pull bar contact with adjusting rod, U-shaped, now, when sample imbibition, sample is only limited by ring of measuring one's own ability and is acted on, and waits just
Degree flexible boundary condition is reached.
Further, the step carrying out the test of the soil expansion under single boundary condition is:
1) prepare cutting ring sample, put it in load sample room, then load sample room is positioned on load sample platform；
2) according to required boundary condition, regulation reach constant volume boundary condition, constant stress boundary condition or etc. rigidity soft
Property boundary condition；
3) after Boundary Condition Control is basically completed, each several part component is finely adjusted, it is ensured that pressure transducer and load sample
Sample contacts in room；
4) adjust the first displacement transducer to contact with overcasting staff, adjust second displacement sensor simultaneously and draw with U-shaped restriction
Bar lower contacts, and control the basic data clearing in data acquisition unit；
5) test number is set, water filling in load sample room, start test.
Further, the soil under multi-boundary Condition is carried out with " constant stress-etc. rigidity flexibility-constant volume " for experiment path
The step of volume expansion test is:
1) prepare cutting ring sample, put it in load sample room, then load sample room is positioned on load sample platform；
2) controlling the first adjusting nut is free state, and controlling the second adjusting nut is stationary state, makes boundary condition cut
It is changed to constant stress condition；
3) adjustment hammer makes charger be initially in level, finally according to default axial stress, to counterweight
Hanging scaffold adds counterweight；
4) each several part component is finely adjusted, makes pressure transducer contact with load sample room including regulation leverage；Adjust
Adjusting rod, makes measure one's own ability ring and rigid plate disengaging；Regulate the first displacement transducer to contact with overcasting staff；
5) water filling in load sample room, starts test, utilizes data acquisition unit to be acquired sensing data simultaneously；When
When axial expansion deformation reaches preset, controlling the first adjusting nut is stationary state, makes rigid plate to continue up；
6) control and regulation bar, the hoop that makes to measure one's own ability contact with adjusting rod, contacts with U-shaped restriction pull bar downwards；Meanwhile, regulation
Second displacement sensor limits with U-shaped and contacts bottom pull bar；
7) controlling the second adjusting nut is free state, and now, sample is only limited by ring of measuring one's own ability and acts on, boundary condition
The rigidity flexible boundary condition such as switch to；
8), when equivalent force annular strain reaches preset, controlling the second adjusting nut is stationary state, now, due to by U
Shape limits the effect of pull bar, and the expansive force of the follow-up generation of sample is no longer to ring generation effect of measuring one's own ability, but directly acts on U-shaped limit
On pull bar processed；Simultaneously as the first adjusting nut is in stationary state, rigid plate cannot move, for sample, and boundary condition
Switch to constant volume boundary condition.
3. beneficial effect
Use the technical scheme that this utility model provides, compared with existing known technology, there is following remarkable result:
(1) a kind of multi-boundary Condition dilatometer of the present utility model, be integrated with simultaneously constant stress, constant volume and etc. rigidity soft
Property border three arbitrary boundary conditions simulation mechanism, can be simulated according to the varying environment residing for the soil body, result of the test more meets very
Truth condition；
(2) a kind of multi-boundary Condition dilatometer of the present utility model, according to the limit that the soil body is residing in Practical Project environment
Boundary's condition, can realize freely switching between three arbitrary boundary conditions, and to adapt to different test routines, instrument is applied widely,
Easy and simple to handle, data are reliable；
(3) a kind of multi-boundary Condition dilatometer of the present utility model, devises the dress of the rigidity flexible boundaries such as a set of simulation
Put, the control of the flexible boundary condition to different-stiffness can be realized；
(4) a kind of multi-boundary Condition dilatometer of the present utility model, have employed novel sensor-type measurement apparatus, can be real-time
The expansive force of sample in process of the test is measured by ground with expansion rate, and test accuracy is high.
Accompanying drawing explanation
Fig. 1 is substructure schematic diagram of multi-boundary Condition dilatometer of the present utility model；
Fig. 2 is the superstructure schematic diagram of multi-boundary Condition dilatometer of the present utility model.
Label declaration in schematic diagram:
1, lower frame；2, lower platform；3, load sample platform；4, counterweight hanging scaffold；5, leverage；6, counterweight；7, carry
Specimen chamber；8, eccentric shaft；9, steady brace；10, the first adjusting nut；11, rigid plate；12, pull bar is loaded；13, U-shaped limits and draws
Bar；14, measure one's own ability ring；15, adjusting rod；16, the second adjusting nut；17, pressure transducer；18, the first displacement transducer；19,
Two displacement transducers；20, overcasting staff.
Detailed description of the invention
For further appreciating that content of the present utility model, in conjunction with the accompanying drawings and embodiments this utility model is described in detail.
Embodiment 1
In conjunction with Fig. 1 and Fig. 2 (visual angle of Fig. 2 is that the right side from Fig. 1 looks over), a kind of multi-boundary Condition of the present embodiment is swollen
Swollen instrument, including lower support platform, top fixed frame, boundary condition imitation mechanism, measuring mechanism and load sample room 7, described on
Portion's fixed frame, boundary condition imitation mechanism, load sample room 7 are installed on lower support platform, and measuring mechanism is arranged on top
In fixed frame.
Described lower support platform includes that lower frame 1 and lower platform 2, lower frame 1 are the iron frame that four feet support
Frame, the upper and lower surface of lower platform 2 fixed with load sample platform 3, lower frame 1 respectively by screw, lower frame 1 main
Effect is to support lower platform 2 and other superstructures, and the Main Function of described lower platform 2 is fixing superstructure and support
Load sample platform 3.Load sample room 7 is placed on load sample platform 3, and load sample room 7 is internal is provided with load sample cavity, and load sample cavity is used for holding test
Mould, adding water in cavity, it is saturated that sample can be made to carry out from bottom.
Described top fixed frame includes two steady braces 9, two piece of first adjusting nut 10 and rigid plate 11, fixes and draws
Bar 9 and the first adjusting nut 10 are all with the axis of superstructure for reference to symmetrical, and steady brace 9 is through lower platform 2
And fixed thereto by nut, steady brace 9 upper end is connected with rigid plate 11 by the first adjusting nut 10, wherein, rigid plate
11 be one piece of thickness be the rectangle steel iron plate of 3cm, can realize moving freely or fixing by the first adjusting nut 10, thus
Whole device is made freely up and down to slide along steady brace 9 or fixing.The Main Function of top fixed frame has two, one be for
Other components in instrument superstructure provide and support, and two can be by controlling the first adjusting nut 10 controls instrument top knot
Structure is movable or fixing.
Described boundary condition imitation mechanism include constant volume boundary condition simulation unit, constant stress boundary condition simulation unit and etc. rigidity
Flexible boundary analogue unit, can select for the boundary condition needed for test.Wherein:
Constant volume boundary condition simulation unit includes that U-shaped limits pull bar 13 and the second adjusting nut 16, and it is one that U-shaped limits pull bar 13
Rigidity " u "-shaped framework, its upper end is connected through rigid plate 11 with the second adjusting nut 16.Simulate the concrete of constant volume boundary condition
Operation is: first control the first adjusting nut 10, makes rigid plate 11 be fixed on steady brace 9, then controls the second adjusting nut
16, make U-shaped limit pull bar 13 and fix with rigid plate 11.Now, for load sample room 7, in the vertical direction is only put down by load sample
Platform 3 and U-shaped limit the restriction of pull bar 13, rigid plate 11 and U-shaped restriction pull bar 13 and are controlled geo-stationary by the second adjusting nut 16,
Rigid plate 11 is controlled to move by the first adjusting nut 10 simultaneously, and whole system is fixed, and constant volume boundary condition is reached.
Constant stress boundary condition simulation unit includes a charger, and charger includes that be installed on lower support platform puts down
Weighing apparatus hammer 6, leverage 5, counterweight hanging scaffold 4, eccentric shaft 8 and loading pull bar 12.Load pull bar 12 upper end to fix with rigid plate 11, under
End is connected with leverage 5 by eccentric shaft 8.The main operational principle of charger is as follows: add weight in counterweight hanging scaffold 4
Code, Weight gravity can be transferred to eccentric shaft 8 by leverage 5, and then be transferred to whole rigid plate 11 by loading pull bar 12,
Under conditions of control the first adjusting nut 10 makes rigid plate 11 not acted on by steady brace 9, U-shaped limits pull bar 13 by rigid plate
The power that 11 transmission come is transferred in the pressure transducer 17 that its lower end is fixing oppositely downward, by controlling counterweight in counterweight hanging scaffold 4
Quantity thus regulate pressure transducer 17 and put on the load of sample.
The concrete operations of simulation constant stress boundary condition are: first control the first adjusting nut 10 movable, make rigid plate 11 edge
Steady brace 9 to slide up and down；Then control the second adjusting nut 16, make U-shaped limit pull bar 13 and fix with rigid plate 11；Pass through
Adjustment hammer 6 makes charger initial balance, finally according to default axial stress, adds counterweight in counterweight hanging scaffold 4.Right
For sample in load sample room 7, after water suction, can upwards expand deformation, simultaneously suffered by xial feed keep constant, permanent
Stress boundary condition is reached.
Including measuring one's own ability ring 14 and adjusting rod 15 etc. rigidity flexible boundary analogue unit, ring 14 of measuring one's own ability is arranged on U-shaped and limits and draw
Bar 13 is internal, and ring 14 rigidity of measuring one's own ability is 2112kN/cm, and its upper and lower two ends limit pull bar 13 with adjusting rod 15 and U-shaped respectively and contact,
Adjusting rod 15, through rigid plate 11, can move up and down by rotating regulation, the ring 14 whether stress thus regulation is measured one's own ability.It is worth
Illustrate, limit pull bar 13 inside owing to ring 14 of measuring one's own ability is arranged on U-shaped, so limiting when the second adjusting nut 16 controls U-shaped
When pull bar 13 is fixed, ring 14 of measuring one's own ability is isolated with whole upper system, no longer stress.The operation principle of this partial component is as follows: when
Controlling the first adjusting nut 10 when fixing, whole top fixed frame in the vertical direction cannot move, and makes superstructure overall
Cannot be movable, control U-shaped simultaneously and limit the freely activity of pull bar 13 in the vertical direction, make the sample in load sample room 7 only be measured
The restriction effect of power ring 14.
The concrete operations of the rigidity flexible boundary conditions such as simulation are: first control the first adjusting nut 10, make top fixed frame
Frame is fixed；Then control the second adjusting nut 16, make U-shaped limit pull bar 13 the most movable；Control to adjust bar 15 again, make ring of measuring one's own ability
About 14 limit pull bar 13 with adjusting rod 15 and U-shaped respectively contacts, and now, when sample imbibition, sample is only measured one's own ability ring
The restriction effect of 14, reaches etc. rigidity flexible boundary condition.
The present embodiment mainly realizes the freely activity or fixing of whole system by controlling the first adjusting nut 10；By control
Make the second adjusting nut 16 and regulate the state that U-shaped restriction pull bar 13 is movable or fixing, it is achieved whether ring 14 of measuring one's own ability acts on lower section
Sample.In actual operation, regulate the first adjusting nut 10 and state of the second adjusting nut 16, it is achieved to three kinds of limits simultaneously
The transformation of boundary's condition, specific as follows: (1) controls the first adjusting nut 10 freely, the second adjusting nut 16 is fixed, it is achieved constant stress
Boundary condition；(2) controlling the first adjusting nut 10 to fix, the second adjusting nut 16 is fixed, it is achieved constant volume boundary condition；(3)
Controlling the first adjusting nut 10 to fix, the second adjusting nut 16 freely, adjusts adjusting rod 15 simultaneously, makes measure one's own ability ring 14 and U-shaped limit
Pull bar 13 processed contacts, it is achieved etc. rigidity flexible boundary condition.
Described measuring mechanism includes pressure transducer the 17, first displacement transducer 18, second displacement sensor 19, measures mark
Bar 20 and data acquisition unit.Pressure transducer 17 top and U-shaped limit pull bar 13 and fix, and its range is 0-10kN, and precision is
0.001kN, pressure transducer 17 bottom and sample contacts in load sample room 7, can measure in real time to sample axial stress, including
The load under the conditions of constant stress, sample applied, and the expansive force that under the conditions of other, sample produces；First displacement transducer 18 is pacified
Being contained in U-shaped and limit the bottom of pull bar 13, contact with overcasting staff 20, its range is 0-50mm, and precision is 0.01mm；First displacement
Sensor 18 coordinates with overcasting staff 20 and can measure the displacement of whole superstructure, and overcasting staff 20 is then for measuring
The displacement of portion's structure；Second displacement sensor 19 is arranged on U-shaped and limits in the middle part of pull bar 13, can survey the deformation of ring 14 of measuring one's own ability
Amount, its range is 0-10mm, and precision is 0.01mm.All above sensor all connects with corresponding data acquisition unit, whole
Test process can realize automatic data collection and storage.
The present embodiment carries out the exemplary steps of the soil expansion test under single boundary condition:
(1) prepare cutting ring sample, put it in load sample room 7, then load sample room 7 is positioned on load sample platform 3；
(2) according to required boundary condition, it is adjusted according to above-mentioned operational approach, as constant volume condition controls first
Adjusting nut 10 and the second adjusting nut 16 are stationary state；Constant stress condition controls the first adjusting nut 10 freely, and second
Adjusting nut 16 is fixed；Controlling the first adjusting nut 10 fix etc. rigidity flexibility condition, the second adjusting nut 16 freely, is adjusted simultaneously
The position of whole adjusting rod 15；
(3) after Boundary Condition Control is basically completed, each several part component is finely adjusted, it is ensured that pressure transducer 17 and load
Sample contacts in specimen chamber 7, other restrictive condition keeps good；
(4) adjust the first displacement transducer 18 to contact with overcasting staff 20, adjust second displacement sensor 19 and U-shaped simultaneously
Limit pull bar 13 lower contacts, by computation, make the basic data in acquisition software reset；
(5) test number is set, water filling in load sample room 7, start test.
Embodiment 2
A kind of multi-boundary Condition dilatometer of the present embodiment, substantially with embodiment 1, its difference is: the present embodiment
By regulating the first adjusting nut 10 and active state of the second adjusting nut 16 simultaneously, control rigid plate 11, U-shaped restriction pull bar
13 or fix for activity with ring 14 of measuring one's own ability, thus realize freely switching between three arbitrary boundary conditions.Below in conjunction with " constant stress
Etc. rigidity flexibility constant volume " this test routine illustrates that the present embodiment carries out the concrete of the expansion test under multi-boundary Condition
Operation:
(1) prepare cutting ring sample, put it in load sample room 7, then load sample room 7 is positioned on load sample platform 3；
(2) controlling the first adjusting nut 10 is free state, and controlling the second adjusting nut 16 is stationary state, makes instrument
Boundary condition simulation device switches to constant stress condition；
(3) adjustment hammer 6 makes charger be initially in level, adds counterweight so that axle in counterweight hanging scaffold 4
To load equal to 100kPa；
(4) each several part component is finely adjusted, makes pressure transducer 17 slight with load sample room 7 including regulation leverage 5
Contact；Adjusting adjusting rod 15, the ring 14 that makes to measure one's own ability departs from rigid plate 11；Regulate the first displacement transducer 18 to connect with overcasting staff 20
Touch；
(5) water filling in load sample room 7, starts test, utilizes automatic acquisition device to be acquired sensing data simultaneously；
When axial expansion deformation reaches preset, controlling the first adjusting nut 10 is stationary state, makes rigid plate to continue up
Motion；
(6) by control and regulation bar 15, the ring 14 that makes to measure one's own ability upwards contacts with adjusting rod 15, downwards with U-shaped restriction pull bar 13
Contact；Meanwhile, regulation second displacement sensor 19 limits with U-shaped and contacts bottom pull bar 13；
(7) controlling the second adjusting nut 16 is free state, and now, sample is only limited by ring 14 of measuring one's own ability and acts on, limit
Boundary's condition such as switches at the rigidity flexible boundary；
(8), when equivalent force ring 14 deformation reaches preset, controlling the second adjusting nut 16 is stationary state, now, due to
Limited the effect of pull bar 13 by U-shaped, the expansive force of the follow-up generation of sample is no longer to ring 14 generation effect of measuring one's own ability, but directly makees
Pull bar 13 is limited for U-shaped；Simultaneously as the first adjusting nut 10 is in stationary state, rigid plate 11 cannot move, to examination
For sample, whole system is in constant volume state.
Schematically being described this utility model and embodiment thereof above, this description does not has restricted, accompanying drawing
Shown in be also one of embodiment of the present utility model, actual structure is not limited thereto.So, if this area
Those of ordinary skill enlightened by it, creating in the case of objective without departing from this utility model, designing without creative
The frame mode similar to this technical scheme and embodiment, all should belong to protection domain of the present utility model.
Claims (3)
1. a multi-boundary Condition dilatometer, including lower support platform, top fixed frame and load sample room (7), lower support
Platform top fixed frame, load sample room (7) are placed in inside the fixed frame of top, it is characterised in that: also include boundary condition
Simulation mechanism and measuring mechanism, described boundary condition imitation mechanism includes constant volume boundary condition simulation unit, constant stress module of boundary
Endorsement unit and etc. rigidity flexible boundary analogue unit, can for test needed for boundary condition, it is achieved three kinds of boundary condition simulations from
By switching；Test desired parameters is measured, wherein by described measuring mechanism:
Described constant volume boundary condition simulation unit includes that U-shaped limits pull bar (13) and the second adjusting nut (16), and U-shaped limits pull bar
(13) upper end is connected through rigid plate (11) with the second adjusting nut (16)；
Described constant stress boundary condition simulation unit includes a charger, and this charger includes counterweight hanging scaffold (4), leverage
(5), counterweight (6), eccentric shaft (8) and load pull bar (12), wherein, load pull bar (12) upper end and rigid plate (11) and fix,
Lower end is connected with leverage (5) by eccentric shaft (8)；Counterweight hanging scaffold (4) is connected with leverage (5) front end, counterweight (6)
It is connected with leverage (5) rear end；
The rigidity flexible boundary analogue unit such as described includes measuring one's own ability ring (14) and adjusting rod (15), and ring of measuring one's own ability (14) is installed on U
It is internal that shape limits pull bar (13), and the lower end of ring of measuring one's own ability (14) limits pull bar (13) bottom and contacts with U-shaped, upper end and adjusting rod (15)
Contact；Adjusting rod (15) passes rigid plate (11), and adjusting rod (15) moves up and down decision and measures one's own ability ring (14) whether stress.
A kind of multi-boundary Condition dilatometer the most according to claim 1, it is characterised in that: described top fixed frame bag
Including steady brace (9), the first adjusting nut (10) and rigid plate (11), steady brace (9) lower end is fixed with lower support platform,
Upper end is connected with rigid plate (11) by the first adjusting nut (10), and the first adjusting nut (10) regulation rigid plate (11) is the most solid
Determine, only move up, only move down or move freely.
A kind of multi-boundary Condition dilatometer the most according to claim 2, it is characterised in that: described measuring mechanism includes pressure
Force transducer (17), the first displacement transducer (18), second displacement sensor (19), overcasting staff (20) and data acquisition dress
Put；Pressure transducer (17) top and U-shaped limit pull bar (13) and fix；First displacement transducer (18) is installed on U-shaped restriction and draws
Bar (13) bottom, and contact with overcasting staff (20)；Second displacement sensor (19) is installed on U-shaped and limits pull bar (13) middle part；
Data acquisition unit is connected, for automatically gathering data in process of the test and storing up by wire and three sensors
Deposit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620581929.2U CN205826491U (en) | 2016-06-15 | 2016-06-15 | A kind of multi-boundary Condition dilatometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620581929.2U CN205826491U (en) | 2016-06-15 | 2016-06-15 | A kind of multi-boundary Condition dilatometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205826491U true CN205826491U (en) | 2016-12-21 |
Family
ID=57568789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620581929.2U Withdrawn - After Issue CN205826491U (en) | 2016-06-15 | 2016-06-15 | A kind of multi-boundary Condition dilatometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205826491U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891105A (en) * | 2016-06-15 | 2016-08-24 | 南京大学 | Multi-boundary-condition dilatometer and soil expansion test method |
| CN112415174A (en) * | 2020-10-27 | 2021-02-26 | 西南交通大学 | Multifunctional unsaturated expansive soil expansion and shrinkage test device and test method thereof |
-
2016
- 2016-06-15 CN CN201620581929.2U patent/CN205826491U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891105A (en) * | 2016-06-15 | 2016-08-24 | 南京大学 | Multi-boundary-condition dilatometer and soil expansion test method |
| CN105891105B (en) * | 2016-06-15 | 2018-09-14 | 南京大学 | A kind of multi-boundary Condition dilatometer and soil expansion test method |
| CN112415174A (en) * | 2020-10-27 | 2021-02-26 | 西南交通大学 | Multifunctional unsaturated expansive soil expansion and shrinkage test device and test method thereof |
| CN112415174B (en) * | 2020-10-27 | 2021-09-14 | 西南交通大学 | Multifunctional unsaturated expansive soil expansion and shrinkage test device and test method thereof |
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