CN205786625U - A kind of soil-water characteristic curve experiment instrument controlling vertical stress - Google Patents
A kind of soil-water characteristic curve experiment instrument controlling vertical stress Download PDFInfo
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- CN205786625U CN205786625U CN201620740676.9U CN201620740676U CN205786625U CN 205786625 U CN205786625 U CN 205786625U CN 201620740676 U CN201620740676 U CN 201620740676U CN 205786625 U CN205786625 U CN 205786625U
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- soil
- sample chamber
- characteristic curve
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- vertical stress
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Abstract
A kind of soil-water characteristic curve experiment instrument controlling vertical stress, including sample chamber, sample chamber is provided with stress loading module, air pressure control module and draining measurement module；Described sample chamber includes base and closed chamber, is placed with pottery clay plates in closed chamber；Described stress loading module includes the dowel steel through sample chamber, and upright to being provided with pressure bar on dowel steel, pressure bar is arranged on support bar, and support bar passes perpendicularly through laboratory table and is connected with weighing device；Described air pressure control module includes air inlet, and air inlet is connected with air compressor machine by air inlet pipe；Described draining measurement module includes osculum, and osculum is connected with burette by drainage pipeline.This utility model provides, and by arranging stress loading module, air pressure control module and draining measurement module, sample can be applied vertical stress, thus obtain soil body water retention property under loading status.
Description
Technical field
This utility model relates to the experimental facilities being applied to soil-water characteristic curve, a kind of vertical stress that controls
Soil-water characteristic curve experiment instrument.
Background technology
Soil-water characteristic curve plays very important role in unsaturated soils theory, and it is at Geotechnical Engineering and environment
Engineering is used widely.The intensity of unsaturated soil, body strain and infiltration coefficient is may determine that, even according to soil-water characteristic curve
May determine that the above moisture content of groundwater level is distributed.
The determination method of soil-water characteristic curve is roughly divided into two classes at present.One class is the direct method of measurement: with pressure plate apparatus and
Tension force is calculated as main.Another kind of is the indirect method of measurement: generally use conduction of heat suction probe, hot coupling suction gauge and filter paper method.
Current existing traditional experimental instrument carry out soil-water characteristic curve measure time suffer from the drawback that cannot avoid molten
Solution at water mesopore gas through too high air-entry value pottery clay plates to external diffusion, even rest on and instrument cannot be discharged this phenomenon pair
The impact of experimental result；The measurement of soil-water characteristic curve cannot be carried out under conditions of applying stress；Do not account for change in volume
Impact on experimental data；On market, the price of the experiment instrument of the type is the most higher.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of soil-water characteristic curve reality controlling vertical stress
Testing instrument, sample can be loaded vertical stress, the bubble solving diffusion produces the problem of impact to experimental result, can record simultaneously
The change in volume of sample improves the precision of measurement result.
For solving above-mentioned technical problem, this utility model be the technical scheme is that
A kind of soil-water characteristic curve experiment instrument controlling vertical stress, including sample chamber, sample chamber is provided with stress and adds
Carry module, air pressure control module and draining measurement module；Described sample chamber includes base and closed chamber, is placed with pottery in closed chamber
Soil plate；Described stress loading module includes the dowel steel through sample chamber, upright to being provided with pressure bar on dowel steel, pressure bar peace
Being contained on support bar, support bar passes perpendicularly through laboratory table and is connected with weighing device；Described air pressure control module includes air inlet
Hole, air inlet is connected with air compressor machine by air inlet pipe；Described draining measurement module includes that osculum, osculum pass through drainage pipeline
Connect with burette.
Described pottery clay plates be air-entry value be the porous pottery clay plates of 5Bar.
Pressure gauge and the pressure regulator valve connecting into entirety is installed in described air inlet pipe.
Being provided with displacement transducer on described support bar, displacement probe and the sample chamber top of displacement transducer contact.
Described osculum is two and is separately positioned on sample chamber two bottom sides, two osculums respectively with respective
Fixed tube connects, and constitutes two set draining measuring mechanisms.
Described burette bottom graduation mark is parallel or less than the base of sample chamber.
A kind of soil-water characteristic curve experiment instrument controlling vertical stress of this utility model, has following technical effect that
1), sample can be applied vertical stress, thus obtain soil body water retention property under loading status, it is achieved outside should
Power and internal suction act on while the soil body, and carry out experimental implementation on this basis, so that the experimental situation of sample is more
Close to and engineering practice.
2), by arranging displacement transducer during stress loading, the height change of sample can be measured thus record
The change in volume of sample, revises the measurement result deviation caused due to stereomutation.Make experimental data more accurate.
3), bubble can be prevented effectively from by the drainage system of two drain pipies and two burette compositions and be diffused in instrument
The impact in drainage system, displacement produced.Owing to two set drainage systems are interconnected, experimentation can be used ear washing bulb
Water in test tube is applied certain atmospheric pressure, allows water wash away back and forth in two test tubes, thus discharge bubble.
Accompanying drawing explanation
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is the sectional view of the sample chamber in this utility model.
Fig. 2 is side view of the present utility model.
Fig. 3 is the front view of the sample chamber in this utility model.
In figure: 1. air compressor machine, 2. pressure regulator valve, 3. dowel steel, 4. sample chamber, 5. burette, 6. steel ball, 7. pressure transmission plate, 8.
Drain pipe, 9. cutting ring, 10. sample, 11. pottery clay plates, 12. cross bars, 13. support bars, 14. pressure bars, 15. displacement transducers, 16.
Osculum, 17. air inlets, 18. air inlet pipe, 19. laboratory tables, 20. scale pans.
Detailed description of the invention
As Figure 1-3, a kind of soil-water characteristic curve experiment instrument controlling vertical stress includes laboratory table 19, laboratory table
Being provided with sample chamber 4 on 19, sample chamber 4 is positioned in laboratory table 19, is a cylindrical enclosure space, and sample chamber 4 includes the end
Seat and matching used closed chamber, base is embedded with the porous pottery clay plates 11 that one piece of air-entry value is 5Bar, and sample 9 is placed on potter's clay
On plate 11, above sample, add one piece of permeable stone, above permeable stone, put pressure transmission plate 7 and steel ball 6.Steel ball 6 and dowel steel 3 one end phase
Contact, dowel steel 3 other end is positioned at sample chamber 4 top and through top cover, and dowel steel 3 is positioned at immediately below pressure bar 14, and press bar
14 are arranged on support bar 13, and support bar 13 passes perpendicularly through laboratory table 19(and is vertically arranged perpendicular so that be carried in test sample
Equal to stress intensity and the power conversed) and be connected with scale pan 20, when adding an appropriate number of counterweight, weight can be relied on
The weight of code, again by cross bar 12 and the transmission of support bar 13, can make pressure bar 14 and dowel steel 3 good contact, thus reach right
Sample applies the purpose of vertical pressure.Sample chamber 4 sidewall arranges air inlet 17, and air inlet is by air inlet pipe 18 with air compressor machine 1 even
Connect.It addition, Pressure gauge and pressure regulator valve 2 be an integral installation in air inlet pipe 18, air pressure can be carried out coarse adjustment and fine tuning, it is ensured that
The precision of air pressure adjustment.When needs pressure air pressure, a certain amount of water first can be added in two burettes.It is right to need according to experiment
Sample applies atmospheric pressure step by step or reduces atmospheric pressure step by step.Under the effect of additional matric suction, soil sample water suction or draining, with
Reach the suction equalization within soil sample.Described base both sides arrange osculum 16, two osculums 16 respectively with drain pipe 8, titration
Pipe 5 connects.Two set draining measurement apparatus can discharge the bubble of diffusion in the later stage, improves experimental precision.
Displacement transducer 15 is installed, the displacement probe of displacement transducer 15 and sample chamber top phase on described support bar 13
Contact.Thus can measure the height change of sample thus record the change in volume of sample, revise and cause due to stereomutation
Measurement result deviation.Make experimental data more accurate.
Described burette 5 bottom graduation mark is parallel or less than the base of sample chamber 4.Pottery clay plates saturation history titrates
Need in pipe to add certain water.In later stage consolidation process, can prevent water from flowing back into sample chamber.
Operating process and principle:
1), test before first high air-entry value pottery clay plates is carried out saturated, add a certain amount of time saturated in sample chamber
Water then cover sample cylinder and make sample chamber airtight, apply the air pressure of about 1Bar, wait about the about 24 hours water work at air pressure
Make pottery clay plates saturated with being pushed down into pottery clay plates.
In pottery clay plates saturation history, add certain water in acid buret, but water level outline is less than base.Its objective is
Consolidation process afterwards prevent water from flowing back into sample chamber.
The sample of experiment is cutting ring sample, is placed in sample chamber by sample after completing sample preparation, adjusts sample position and is put in pottery
Soil plate centre (i.e. sample chamber centre).Add one piece of permeable stone above sample, above permeable stone, put pressure transmission plate and steel ball.Steel
Pearl and pressure transmission bar contact.
2), next according to experiment demand, sample can be consolidated, according to experimental design, sample be carried out multistage loadings,
Every stage pressure can the reading no more than 0.005mm in 1 hour with lasting 24 hours as standard or according to dial gauge be mark
Standard is considered as under current pressure state having consolidated.Next every one-level stress is loaded until sample has consolidated with above standard.
3), consolidated rear (if experimental program does not has the consolidation stage to skip the consolidation stage), entered pressure air pressure rank
Section.Utilize saturated high air-entry value pottery clay plates, use axial translation technology to control the matric suction of soil sample.Pore water pressure remains
Zero, by atmospheric pressure control system, sample is applied air pressure, control air pressure size by Pressure gauge.Gas shown on Pressure gauge
Pressure size is matric suction size.In two acid burets, now add a certain amount of water.Need examination according to experiment
Sample applies atmospheric pressure or reduce atmospheric pressure step by step step by step.Under the effect of additional matric suction, soil sample water suction or draining, to reach
To the suction equalization within soil sample.When the water level in test tube no longer changes, it was demonstrated that the water volume in soil sample no longer changes,
Show that the matric suction within soil sample and the atmospheric pressure applied reach balance.On Pressure gauge, the air pressure force value of display is soil sample
Current matric suction value, can go out the water content of now soil sample simultaneously according to water volume change calculations.Then next stage is applied
Air pressure, repeats above step.After above step is repeated several times, a series of matric suction value and corresponding soil can be obtained
The value of sample water content.Carry out these data processing the data that conversion can obtain wanting, can draw and experimental program simultaneously
Relevant soil-water characteristic curve.
In process of the test, after pressing sample, pressure bar can be subjected to displacement along with the change of the volume of sample.Position
Displacement sensor is installed on support bar, and pressure bar is movement under the drive of support bar, so when sample generation change in volume
Time, displacement transducer also will move along with support bar.The reading gone out shown by displacement transducer is axial displacement, by measuring
The axial body conversion gone out calculates the change in volume of sample.The volume of sample change shadow to result of the test is considered by this measure
Ring, thus improve the precision of experiment.
Owing to two set drainage systems are connected, in experimentation, the water in test tube can be applied a certain size air pressure.
A certain amount of water in one of them acid buret is pressed in another test tube by pipeline and pottery clay plates, then to another
Repeat aforesaid operations, the most back and forth make water wash away back and forth in two test tubes, thus discharge the bubble of diffusion.By this measure
Solve the bubble impact on displacement of diffusion, improve the degree of accuracy of experimental data.
This instrument is with compared with type instrument, and economical and practical, simple to operate, experimental data intuitively also allows for observation.Above-mentioned
In scheme, displacement transducer has an advantage in that and can automatically record displacement, but whole set of installation is on the high side, installs loaded down with trivial details.Can
To need to be replaced by displacement transducer dial gauge according to experiment, dial gauge cannot record displacement automatically, but its advantage is
Price economy material benefit, installs convenient and swift, it is also possible to reach to test required standard.Can according to self-condition voluntarily
Select.
Claims (6)
1. the soil-water characteristic curve experiment instrument that can control vertical stress, it is characterised in that: include sample chamber (4), sample chamber
(4) stress loading module, air pressure control module and draining measurement module it are provided with；Described sample chamber (4) includes base and sealing
Room, is placed with pottery clay plates (11) in closed chamber；Described stress loading module includes the dowel steel (3) through sample chamber (4), power transmission
Bar (3) is upper upright to being provided with pressure bar (14), and pressure bar (14) is arranged on support bar (13), and support bar (13) passes perpendicularly through reality
Test platform and be connected with weighing device；Described air pressure control module includes air inlet (17), and air inlet (17) passes through air inlet pipe (18)
It is connected with air compressor machine (1)；Described draining measurement module includes osculum (16), and osculum (16) is by drainage pipeline (8) and drips
Fixed tube (5) connects.
A kind of soil-water characteristic curve experiment instrument controlling vertical stress the most according to claim 1, it is characterised in that: institute
State pottery clay plates (11) be air-entry value be the porous pottery clay plates of 5Bar.
A kind of soil-water characteristic curve experiment instrument controlling vertical stress the most according to claim 1, it is characterised in that: institute
State and Pressure gauge and the pressure regulator valve (2) connecting into entirety is installed in air inlet pipe (18).
A kind of soil-water characteristic curve experiment instrument controlling vertical stress the most according to claim 1, it is characterised in that: institute
Stating and be provided with displacement transducer (15) on support bar (13), displacement probe and the sample chamber top of displacement transducer (15) connect
Touch.
A kind of soil-water characteristic curve experiment instrument controlling vertical stress the most according to claim 1, it is characterised in that: institute
State osculum (16) to be two and be separately positioned on sample chamber (4) two bottom sides, two osculums (16) respectively with respective
Fixed tube (5) connects, and constitutes two set draining measuring mechanisms.
A kind of soil-water characteristic curve experiment instrument controlling vertical stress the most according to claim 1, it is characterised in that: institute
State burette (5) bottom graduation mark parallel or less than the base of sample chamber (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620740676.9U CN205786625U (en) | 2016-07-14 | 2016-07-14 | A kind of soil-water characteristic curve experiment instrument controlling vertical stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620740676.9U CN205786625U (en) | 2016-07-14 | 2016-07-14 | A kind of soil-water characteristic curve experiment instrument controlling vertical stress |
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| CN205786625U true CN205786625U (en) | 2016-12-07 |
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| CN201620740676.9U Expired - Fee Related CN205786625U (en) | 2016-07-14 | 2016-07-14 | A kind of soil-water characteristic curve experiment instrument controlling vertical stress |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061740A (en) * | 2017-10-26 | 2018-05-22 | 兰州大学 | A kind of laboratory testing rig and its test method based on native water CURVE STUDY unsaturation salinity transfer rule |
| CN108680480A (en) * | 2018-04-18 | 2018-10-19 | 同济大学 | A kind of unsaturation coarse-grained soil permeameter and its test method |
| CN110031606A (en) * | 2019-04-02 | 2019-07-19 | 苏州汇才土水工程科技有限公司 | A kind of method of the drying shrinkage test device and its inverting soil-water characteristic curve of soil |
| CN110514680A (en) * | 2019-08-22 | 2019-11-29 | 山东大学 | Miniature soil-water characteristic curve experimental rig and method suitable for industrial CT scan |
| CN112326871A (en) * | 2020-10-30 | 2021-02-05 | 三峡大学 | Swelling rock dry-wet cycle tester with load and testing method |
-
2016
- 2016-07-14 CN CN201620740676.9U patent/CN205786625U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061740A (en) * | 2017-10-26 | 2018-05-22 | 兰州大学 | A kind of laboratory testing rig and its test method based on native water CURVE STUDY unsaturation salinity transfer rule |
| CN108680480A (en) * | 2018-04-18 | 2018-10-19 | 同济大学 | A kind of unsaturation coarse-grained soil permeameter and its test method |
| CN110031606A (en) * | 2019-04-02 | 2019-07-19 | 苏州汇才土水工程科技有限公司 | A kind of method of the drying shrinkage test device and its inverting soil-water characteristic curve of soil |
| CN110514680A (en) * | 2019-08-22 | 2019-11-29 | 山东大学 | Miniature soil-water characteristic curve experimental rig and method suitable for industrial CT scan |
| CN112326871A (en) * | 2020-10-30 | 2021-02-05 | 三峡大学 | Swelling rock dry-wet cycle tester with load and testing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 Termination date: 20170714 |
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| CF01 | Termination of patent right due to non-payment of annual fee |