CN206515335U - A kind of experimental rig for testing unsaturated soil transmission characteristic - Google Patents
A kind of experimental rig for testing unsaturated soil transmission characteristic Download PDFInfo
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- CN206515335U CN206515335U CN201720232288.4U CN201720232288U CN206515335U CN 206515335 U CN206515335 U CN 206515335U CN 201720232288 U CN201720232288 U CN 201720232288U CN 206515335 U CN206515335 U CN 206515335U
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Abstract
The utility model provides a kind of experimental rig for testing unsaturated soil transmission characteristic, including air compressor, and air compressor output end is connected with the first charge input terminal, and first supervisor's output end is connected in parallel to the first branch pipe and the second branch pipe；It is sequentially provided with first branch pipe on gas bomb, the first magnetic valve and first pressure sensor, the second branch pipe and is sequentially provided with water-storing bottle, the second magnetic valve and second pressure sensor；First branch pipe and the second branch pipe are connected after crossing with the second charge input terminal, and second supervisor's output end at the top of dress sampling device with being connected, and dress sampling device outlet at bottom is connected with thin mouth collection bottle, and thin mouth collection bottle is on electronic balance sensor；Dress sampling device is used to load soil sample, and its top is provided with upper loaded filter, and its bottom is provided with lower loaded filter, and its side wall reserves hole site and is respectively equipped with water content sensor and sensor for pore water pressure；The utility model can measure the soil-water characteristic curve and water of unsaturated soil, gas phase permeability saturation curve simultaneously.
Description
Technical field
The utility model is related to Geotechnical Engineering field, is filled in particular to a kind of experiment for testing unsaturated soil transmission characteristic
Put.
Background technology
Unsaturated soil transmission characteristic is primarily referred to as soil-water characteristic curve and water, gas phase permeability saturation curve, native water feature
Curve is the relation curve of matric suction and saturation degree (water content), and permeability saturation curve is relative permeability (gas phase and water
Phase) relation curve between saturation degree (water content).Its determination method is roughly divided into two classes：The direct method of measurement and indirect measurement side
Method.The soil-water characteristic curve direct method of measurement is mainly what is determined by direct measurement matric suction and water content, matric suction
The tensioned meter method of method of testing, grittiness funnel method, Instrument for Pressure method, centrifuge method etc., aqueous weight testing method mainly have weight method,
NEUTRON METHOD, ray transmission method, time domain reflectometry etc..The permeability saturation curve direct method of measurement can according to whether hydraulic gradient changes
It is divided into steady state test method and unstable state test method.Soil-water characteristic curve and permeability saturation curve indirect measurement method are all led
To include empirical formula method, physics-empirical method, fractals method, morphological method and the Method for Numerical Inversion etc..
It is determined that there are the following problems for the conventional method of the unsaturation transmission characteristic of soil：1. the accurate control of matric suction is asked
Topic.Because suction is that classification applies, the overlong time needed for sample suction equalization is waited, while in order to weigh containing during balance
Water, some instruments can not continuously apply suction, and soil water sorption process is of short duration, and direct measurement matric suction is difficult to catch
Catch.2. gas phase action is not considered.The unsaturated seepage of gas phase and liquid phase in soil is a process intercoupled, some surveys
Test instrument or theoretical research do not account for the coupled relation of aqueous vapor Two-Phase Flow Through Porous Media.3. can not obtain simultaneously soil-water characteristic curve and
Permeability saturation curve.Although the tester of unsaturated soil is already available to soil-water characteristic curve or relative permeability is bent
Line, but matric suction and saturation degree, three relation curves of water, gas phase relative permeability and saturation degree are related, majority tests
Method can not obtain this three curves simultaneously, it is impossible to correct reflection water retention in soil and Penetration Signature.
The content of the invention
The purpose of this utility model is to overcome above-mentioned deficiency to fill there is provided a kind of experiment for testing unsaturated soil transmission characteristic
Put, soil-water characteristic curve and water, the gas phase permeability saturation curve of unsaturated soil can be measured simultaneously.
The utility model is in order to solve the above technical problems, the technical scheme used is：One kind test unsaturated soil transmission
The experimental rig of characteristic, including air compressor, the air compressor output end are connected with the first charge input terminal, and described
One supervisor's output end is connected in parallel to the first branch pipe and the second branch pipe；
Gas bomb, the first magnetic valve and first pressure sensor, second branch pipe are sequentially provided with first branch pipe
On be sequentially provided with water-storing bottle, the second magnetic valve and second pressure sensor；
First branch pipe and the second branch pipe are connected after crossing with the second charge input terminal, it is described second supervisor output end with
Fill and connected at the top of sampling device, the dress sampling device outlet at bottom is connected with thin mouth collection bottle, and the thin mouth collection bottle is located at electronics
In balance sensor；
The dress sampling device is used to load soil sample, and its top is provided with upper loaded filter, and its bottom is provided with lower loaded filter, its side wall
Reserved hole site is respectively equipped with water content sensor and sensor for pore water pressure.
Preferably, the first pressure sensor, second pressure sensor, water content sensor, sensor for pore water pressure and electricity
Sub- balance sensor is connected by data collecting card with computer, and first magnetic valve and the second magnetic valve pass through relay module
It is connected with computer.
Preferably, also it is equipped with check-valves on first branch pipe and the second branch pipe.
Preferably, dress sampling device is to be additionally provided with resistance on cylindrical shape, its side wall to ooze ring.
Preferably, dc source is electrically connected with data collecting card and relay module respectively.
The beneficial effects of the utility model：
1st, the utility model device carries out drying and watering cycle laboratory test to soil sample, in real time collection soil sample seepage discharge and along journey pressure
Power, water content data, can so calculate soil-water characteristic curve and relative permeability are bent by working out numerical inversion software for calculation
Line；
2nd, the utility model process of the test loads drying and watering cycle to soil sample repeatedly, and soil sample moisture absorption and drying can be tested mutually
Card and amendment, test the seepage discharge of the whole process of collection and also may be used along stroke pressure, water content data when numerical inversion is calculated
To be mutually authenticated and correct；
3rd, it is the process of aqueous phase and gas phase interaction in view of unsaturation transmitting procedure in soil, the utility model is to be based on
Aqueous vapor Two-Phase Flow Through Porous Media general principle, more meets unsaturated water gas motion feature in soil；
4th, the utility model realizes that drying and watering cycle loading is automatically controlled and real time data acquisition, realizes that test process is automatic
Change；
5th, it is related, this practicality to saturation degree, infiltration three curves of permeation coefficient and saturation degree in view of matric suction
New device can measure three this structure curves of same soil sample simultaneously, it is ensured that the compatibility between them.
Brief description of the drawings
Fig. 1 is a kind of structural representation for the experimental rig for testing unsaturated soil transmission characteristic；
Fig. 2 be Fig. 1 in automatically control and data collecting system connection diagram；
In figure, air compressor 1, first is responsible for the 2, first branch pipe 3, the second branch pipe 4, gas bomb 5, the first magnetic valve 6, the
It is one pressure sensor 7, water-storing bottle 8, the second magnetic valve 9, the supervisor of second pressure sensor 10, second 11, dress sampling device 12, upper anti-
Filtering layer 12.1, lower loaded filter 12.2, water content sensor 12.3, sensor for pore water pressure 12.4, thin mouth collection bottle 13, electronic balance are passed
Sensor 14, data collecting card 15, computer 16, relay module 17, soil sample 18, check-valves 19, dc source 20.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, a kind of experimental rig for testing unsaturated soil transmission characteristic, including air compressor 1, institute
State the output end of air compressor 1 to be connected with the first 2 inputs of supervisor, first supervisor, 2 output ends are connected in parallel to first
The branch pipe 4 of pipe 3 and second；
Gas bomb 5, the first magnetic valve 6 and first pressure sensor 7, described second are sequentially provided with first branch pipe 3
Water-storing bottle 8, the second magnetic valve 9 and second pressure sensor 10 are sequentially provided with branch pipe 4；
The branch pipe 4 of first branch pipe 3 and second is connected after crossing with the second 11 inputs of supervisor, and second supervisor 11 is defeated
Go out end to be connected with the top of dress sampling device 12, the dress outlet at bottom of sampling device 12 is connected with thin mouth collection bottle 13, the thin mouth collection
Water bottle 13 is on electronic balance sensor 14；
The dress sampling device 12 is used to load soil sample 18, and its top is provided with upper loaded filter 12.1, and its bottom is provided with lower anti-filter
Layer 12.2, its side wall reserves hole site and is respectively equipped with water content sensor 12.3 and sensor for pore water pressure 12.4.
Preferably, the first pressure sensor 7, second pressure sensor 10, water content sensor 12.3, pore pressure sensing
Device 12.4 and electronic balance sensor 14 are connected by data collecting card 15 with computer 16, the electricity of the first magnetic valve 6 and second
Magnet valve 9 is connected by relay module 17 with computer 16.
Preferably, also it is equipped with check-valves 19 on the branch pipe 4 of the first branch pipe 3 and second.
Preferably, dress sampling device 12 is to be additionally provided with resistance on cylindrical shape, its side wall to ooze ring.
Preferably, dc source 20 is electrically connected with data collecting card 15 and relay module 17 respectively.
The present embodiment course of work is as follows：
1) sample preparation and dress sample：In dress specimen chamber surface smear binder materials, soil sample saturation degree is controlled and close by placement in layers
Solidity, sample is cylinder, and high 12.5cm, diameter 6.15cm make sample with dress sampling device 12, make that grid are oozed in resistance and binder materials is embedding
Enter earth pillar, prevent the gentle wall seepage flow that hands down of aqueous phase.
2) device is connected：Sample is installed, the He of water content sensor 12.3 is buried on the side wall preformed hole of dress sampling device 12
Sensor for pore water pressure 12.4, pipeline and other parts are connected according to Fig. 1 structure chart.
3) moisture absorption process is simulated：Close the first magnetic valve 6, open the second magnetic valve 9, by air compressor 1 by water storage
Hydraulic pressure is applied in soil sample 18 in bottle 8, and gathers water content sensor 12.3, sensor for pore water pressure 12.4 and electricity in real time with computer 16
The data of sub- balance sensor 14.According to the gathered data of water content sensor 12.3, judge whether wetting front reaches soil sample 18
Bottom, by the data of electronic balance sensor 14, judges whether moisture absorption process reaches stable state.
4) drying is simulated：If wetting front reaches the bottom of soil sample 18 and seepage flow reaches stabilization, the first magnetic valve 6 is opened,
The second magnetic valve 9 is closed, the hollow air pressure of gas bomb 5 is applied in soil sample 18 by air compressor 1, and it is real-time with computer 16
Gather the data of water content sensor 12.3, sensor for pore water pressure 12.4 and electronic balance sensor 14.According to water content sensor
12.3 gathered data, judges the moisture distribution situation of soil sample 18, by the gathered data of electronic balance sensor 14, judges dehumidification
Whether process reaches stable state.
5) drying and watering cycle is simulated：After drying is stable, the second magnetic valve 9 is opened, the first magnetic valve 6 is closed, repeated
Step 3) and 4), realize drying and watering cycle process simulation.
6) numerical inversion is calculated：According to overall process pressure, water content distribution and the seepage discharge change collected, soil sample is set up
Mathematics physics model, gives boundary condition and primary condition, using the Fortran numerical inversion calculation procedures of establishment, calculates simultaneously
Amendment obtains pc-Sr、Relation.
7) soil-water characteristic curve and permeability saturation curve are made：With saturation degree SrFor abscissa, with corresponding saturation degree SrUnder
Matric suction pc, relative coefficient of permeability (aqueous phaseAnd gas phase) data process of fitting treatment is carried out for ordinate input professional software, obtain
To curve be soil sample 18 unsaturation transfer curve.
The above embodiments are only optimal technical scheme of the present utility model, and are not construed as limit of the present utility model
Embodiment in system, the application and the feature in embodiment can be mutually combined in the case where not conflicting.This practicality is new
Technical characteristic in the technical scheme that the protection domain of type should be recorded with claim, including the technical scheme of claim record
Equivalents are protection domain.Equivalent substitution i.e. within this range is improved, also protection domain of the present utility model it
It is interior.
Claims (5)
1. a kind of experimental rig for testing unsaturated soil transmission characteristic, including air compressor（1）, it is characterised in that：The sky
Air compressor（1）Output end and the first supervisor（2）Input is connected, first supervisor（2）Output end is connected in parallel to first
Branch pipe（3）With the second branch pipe（4）；
First branch pipe（3）On be sequentially provided with gas bomb（5）, the first magnetic valve（6）With first pressure sensor（7）, it is described
Second branch pipe（4）On be sequentially provided with water-storing bottle（8）, the second magnetic valve（9）With second pressure sensor（10）；
First branch pipe（3）With the second branch pipe（4）With the second supervisor after crossing（11）Input is connected, second supervisor
（11）Output end and dress sampling device（12）Top is connected, the dress sampling device（12）Outlet at bottom and thin mouth collection bottle（13）Even
Connect, the thin mouth collection bottle（13）Located at electronic balance sensor（14）On；
The dress sampling device（12）For loading soil sample（18）, its top is provided with upper loaded filter（12.1）, its bottom is provided with lower anti-
Filtering layer（12.2）, the reserved hole site of its side wall is respectively equipped with water content sensor（12.3）And sensor for pore water pressure（12.4）.
2. the experimental rig of test unsaturated soil transmission characteristic according to claim 1, it is characterised in that：First pressure
Force snesor（7）, second pressure sensor（10）, water content sensor（12.3）, sensor for pore water pressure（12.4）And electronic balance
Sensor（14）Pass through data collecting card（15）With computer（16）Connection, first magnetic valve（6）With the second magnetic valve（9）It is logical
Cross relay module（17）With computer（16）Connection.
3. the experimental rig of test unsaturated soil transmission characteristic according to claim 1, it is characterised in that：Described first
Pipe（3）With the second branch pipe（4）On be also equipped with check-valves（19）.
4. the experimental rig of test unsaturated soil transmission characteristic according to claim 1, it is characterised in that：Fill sampling device
（12）Resistance, which is additionally provided with, for cylindrical shape, on its side wall oozes ring.
5. the experimental rig of test unsaturated soil transmission characteristic according to claim 1, it is characterised in that：Dc source
（20）Respectively with data collecting card（15）And relay module（17）Electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720232288.4U CN206515335U (en) | 2017-03-10 | 2017-03-10 | A kind of experimental rig for testing unsaturated soil transmission characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720232288.4U CN206515335U (en) | 2017-03-10 | 2017-03-10 | A kind of experimental rig for testing unsaturated soil transmission characteristic |
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| Publication Number | Publication Date |
|---|---|
| CN206515335U true CN206515335U (en) | 2017-09-22 |
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| CN201720232288.4U Expired - Fee Related CN206515335U (en) | 2017-03-10 | 2017-03-10 | A kind of experimental rig for testing unsaturated soil transmission characteristic |
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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 |
| CN108844881A (en) * | 2018-08-06 | 2018-11-20 | 湖北工业大学 | A method of based on VG model prediction unsaturated soil relative coefficient of permeability |
| CN109001098A (en) * | 2018-08-07 | 2018-12-14 | 西南大学 | A kind of instantaneous Penetration Signature tester of soil and soil infiltration characteristics calculation method |
| CN110579586A (en) * | 2019-10-16 | 2019-12-17 | 长安大学 | unsaturated soil water-gas two-phase flow migration experimental instrument and method under loading and unloading disturbance |
| CN114965217A (en) * | 2022-05-25 | 2022-08-30 | 石家庄铁道大学 | Soil body air curtain seepage-resistance testing device and testing method |
-
2017
- 2017-03-10 CN CN201720232288.4U patent/CN206515335U/en not_active Expired - Fee Related
Cited By (8)
| 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 |
| CN108844881A (en) * | 2018-08-06 | 2018-11-20 | 湖北工业大学 | A method of based on VG model prediction unsaturated soil relative coefficient of permeability |
| CN108844881B (en) * | 2018-08-06 | 2020-08-07 | 湖北工业大学 | Method for predicting relative permeability coefficient of unsaturated soil based on VG model |
| CN109001098A (en) * | 2018-08-07 | 2018-12-14 | 西南大学 | A kind of instantaneous Penetration Signature tester of soil and soil infiltration characteristics calculation method |
| CN109001098B (en) * | 2018-08-07 | 2020-02-21 | 西南大学 | Soil instantaneous permeability characteristic tester and soil permeability characteristic calculation method |
| CN110579586A (en) * | 2019-10-16 | 2019-12-17 | 长安大学 | unsaturated soil water-gas two-phase flow migration experimental instrument and method under loading and unloading disturbance |
| CN114965217A (en) * | 2022-05-25 | 2022-08-30 | 石家庄铁道大学 | Soil body air curtain seepage-resistance testing device and testing method |
| CN114965217B (en) * | 2022-05-25 | 2024-04-12 | 石家庄铁道大学 | Soil air curtain seepage resistance test device and test method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170922 Termination date: 20180310 |