CN207263611U - A kind of device for measuring soil cohesion - Google Patents
A kind of device for measuring soil cohesion Download PDFInfo
- Publication number
- CN207263611U CN207263611U CN201721092792.5U CN201721092792U CN207263611U CN 207263611 U CN207263611 U CN 207263611U CN 201721092792 U CN201721092792 U CN 201721092792U CN 207263611 U CN207263611 U CN 207263611U
- Authority
- CN
- China
- Prior art keywords
- soil
- cutting ring
- drainpipe
- organic glass
- cohesion
- 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.)
- Expired - Fee Related
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model discloses a kind of device for measuring soil cohesion, the device includes water tank, sample installation system and discharging device, overflow port and water injection pipe are set on the water tank, the sample installation system includes organic glass bullet, downtake pipe, the second drainpipe, rubber stopper, cutting ring and sealing ring.The experimental provision of the utility model is easy to operate, of low cost, using reduction water outlet height, pressure head is formed by siphon, acts on the experiment soil body, carries out permeability test, evade the disturbance that the lifting of the experiment soil body is formed at the same time, improve the convenience of measuring.The device is not suitable for the measure of soil particle cohesive force singly, simultaneously can be used for the critical infiltration gradient research of soil, has greatly widened the scope of application of instrument.
Description
Technical field
The utility model belongs to soil cohesion determination techniques field, is related to a kind of device for measuring soil cohesion, tool
Say body, be related to a kind of device based on fluid bed thought measure soil cohesion.
Background technology
Soil cohesion refers to that unit volume soil resistance external force turns round the ability cut in the case of being sufficiently humidified so as to, and is carrying out water and soil
In Study on loss, soil cohesion measure all has for soil erosion prediction, rill development forecast and the erosion caused by sloping surfaces law study
It is of great significance, the soil cohesion ability that more on the whole external force resistance disperses is bigger, and soil resistance to corrosion is stronger, and erosion is got over
It is faint, it is on the contrary then more violent, therefore the size of the index directly affects erosion intensity.Soil cohesion is numerous soil erosion moulds
The important input parameter of type, such as EUROSEM (European soil erosion model) and LISEM (Limburge soil
Erosion model) soil separative efficiency coefficient in model, KINEROS (Kinematic runoff and erosion
Model overland flow Soil separation ability in) sediment transport efficiency factor in model, and MMF (Morgan and Finney) model
Calculate the input for being required for cohesive force.The critical determination of shear strength of soil uses miniature cohesive force instrument (Durham Geo- at present
Enterprises, Inc., UK) it is measured, but need first squirt earth's surface during measure, earth's surface is sufficiently humidified so as to, is then surveyed
It is fixed.The tested fix the number of workers of measurement result twists speed, and when twisting applies pressure, surface soil degree of saturation, root system and litter and contains
The many factors such as amount influence, and fluctuation is larger.Therefore need to seek a kind of easy, accurate soil cohesion measure method.
Utility model content
The purpose of the utility model is to overcome defect existing in the prior art, there is provided a kind of measure soil cohesion
Device.By gathering soil sample, Seepage Experiment is carried out, a certain head lower unit interval seepage discharge is measured, by Darcy's law
Determine soil permeability coefficient, increase with head, infiltration coefficient will undergo mutation, and corresponding head is that soil fluidizes head, root
According to formula C=Δ P- (γs-γw), you can calculate soil cohesion.C is soil cohesion in formula, N/m3；Δ P is high for unit
Spend head difference active force on the soil body, Δ L × 9.8 × 103N/m3, Δ L is unit height soil body head difference；γSFor soil severe,
N/m3；γwFor the severe of water, N/m3。
Its concrete technical scheme is：
A kind of device for measuring soil cohesion, including water tank 1, sample installation system and discharging device 10, the water tank 1
On set overflow port 2 and water injection pipe 3, the sample installation system includes organic glass bullet 4, downtake pipe 5, the second draining
Pipe 6, rubber stopper 7, cutting ring 8 and sealing ring 9, the organic glass bullet 4 are equipped with rubber stopper 7, the downtake pipe 5,
Second drainpipe 6 is located on rubber stopper 7, and the cutting ring 8 is located at the lower section of organic glass bullet 4, the cutting ring 8 and organic glass
Sealing ring 9 is equipped between glass bullet 4, second drainpipe 6 and discharging device 10 connect, and the discharging device 10 is equipped with
Water outlet 14.
Further, the downtake pipe 5 is equipped with the first valve 11, and second drainpipe 6 is equipped with the second valve
12。
Further, the discharging device 10 is semi-rigid transparent hose.
Further, the cutting ring 8 is high 53mm, the standard cutting ring of internal diameter 70mm.
Further, the cutting ring 8 is equipped with lower cover, and the lower cover is perforated lid.
Compared with prior art, the beneficial effects of the utility model are：
The utility model is by permeability test, and for measure soil in the case where permeating flow action, bourn acting force overcomes soil to glue
Corresponding critical condition when tying power, and then determine soil cohesion, it is larger to overcome traditional shearing test measurement result error
Feature.By seepage flow fluid bed, soil sample flow event in cutting ring is measured, by Darcy's law, is tried to achieve when soil sample fluidizes
Hydraulic slope, by formula, you can soil cohesion is tried to achieve, so as to provide convenient method for soil cohesion measure.
Brief description of the drawings
Fig. 1 is the structure diagram for the device for measuring soil cohesion；
Fig. 2 is the structure diagram of the dress specimen chamber for the device for measuring soil cohesion；
Fig. 3 is that the soil weight is 1.32g/cm3Shi Danwei soil bodys head difference and seepage flow discharge relation；
Fig. 4 is unit soil body head difference and seepage flow discharge relation 1.02g/cm3。
Embodiment
The technical solution of the utility model is described in more detail with specific embodiment below in conjunction with the accompanying drawings.
With reference to Fig. 1-Fig. 2, a kind of device for measuring soil cohesion, including water tank 1, sample installation system and discharging device
10, overflow port 2 and water injection pipe 3 are set on the water tank 1, the sample installation system includes organic glass bullet 4, first exhaust
Pipe 5, the second drainpipe 6, rubber stopper 7, cutting ring 8 and sealing ring 9, the organic glass bullet 4 is equipped with rubber stopper 7, described
Downtake pipe 5, the second drainpipe 6 are located on rubber stopper 7, and the cutting ring 8 is located at the lower section of organic glass bullet 4, described
Sealing ring 9 is equipped between cutting ring 8 and organic glass bullet 4, second drainpipe 6 and discharging device 10 connect, it is described go out
Water installations 10 are equipped with water outlet 14.
The downtake pipe 5 is equipped with the first valve 11, and second drainpipe 6 is equipped with the second valve 12.
The discharging device 10 is semi-rigid transparent hose.
The cutting ring 8 is high 53mm, the standard cutting ring of internal diameter 70mm.
The cutting ring 8 is equipped with lower cover, and the lower cover is perforated lid.
Sampled, and be fixed on sample installation system by cutting ring 8 during experiment, sealed by sealing ring 9, prevent gas into
Enter；Sample installation system is immersed in the water during experiment, passes through gas in downtake pipe 5,6 discharge system of the second drainpipe.Can
The discharging device 10 of free 14 height of adjusting water outlet mouth is formed by semi-rigid transparent hose, can freely control the height of water outlet 14
Degree.
A kind of device for measuring soil cohesion of the utility model, during concrete application, comprises the following steps：
First with the cutting ring 8 on device, collection needs measuring point soil sample；Test soil sample 13 is positioned on device, is made
Its saturation that absorbs water, then water-filling in the duct, forms connected state, gradually reduces the height of water outlet 14, using water outlet 14 with
Pressure differential between the water surface in water tank 1, forms negative pressure, acts in experiment soil sample, forms seepage effect；Coordinated by graduated cylinder stopwatch,
Collect certain period water outlet and go out streamflow, you can determine soil sample seepage flow flow under the head, utilized head difference divided by soil sample
Highly, that is, it is hydraulic slope in unit soil sample, using Darcy's law, linear relationship is presented between hydraulic slope and flow；But work as and ooze
When the power that permeable stream is acted on grogs is more than soil cohesion, suspended state will be presented in soil particle, and infiltration current start to become
Muddiness, linear relationship be not presented between hydraulic slope and flow, and corresponding states is the fluidized state that soil cohesion is overcome,
Thus it can determine that soil cohesion.
Specifically, comprise the following steps：
Step 1, using cutting ring 8 gather testing site soil sample, and covers cutting ring lower cover；
Soil sample 13 to be tested, be fixed on experimental provision by step 2, ensures that cutting ring 8 is bored with organic glass using sealing ring 9
It is closed between body 4；
Step 3, open water injection pipe 3, the water filling into water tank 1, and forms overflow；Test soil sample 13 is soaked, reach saturation；
Step 4, open the first valve 11 and the second valve 12, is filled into organic glass bullet 4 and discharging device 10
Water, is guarantee test accurate stability, need to fully discharge wherein bubble；
Step 5, close the first valve 11, and 14 height of adjustment water outlet is less than the water surface 2cm of water tank 1, makes 14 shape of water outlet
Into go out stream；
Step 6, open stopwatch, and the outflow of record unit time period water outlet 14, is seepage discharge under the head difference；
Step 7, reduce water outlet height, declines 5mm every time, measures corresponding head difference Δ h, divided by soil sample height can obtain
To the head difference Δ L of the unit soil body,Water column/m=1850 Δs hN/m3；Observe seepage discharge Q at the same time；
Step 8, the situation for observing by organic glass bullet 4 soil body surface under seepage effect, reach in head difference
During a certain critical value, soil surface floats, and turbid phenomenon occurs in infiltration water；
Step 9, point paint the head difference Δ L and seepage discharge Q relation scatter diagrams of the unit soil body, before soil body fluidisation, Δ L and Q
Between present linear function relation, correspond to head difference when secondary linear relation is transferred, be soil fluidize when head difference.
Step 10, utilize formula C=Δ L- (γs-γw), determine the soil sample cohesive force.
For Yang Ling crop lands, when experiment, gathers 2 groups of soil sample, and the soil weight is respectively 1.02g/cm3And 1.32g/cm3, examination
Test obtains seepage discharge of 2 groups of soil samples under different heads
When the soil weight is 1.32g/cm3, measure to present between soil infiltration flow and unit soil body head difference and closed shown in Fig. 3
System, varies widely when unit head difference is 3.49mm water columns/mm, while in experimentation, also observes soil body hair
Capture moves phenomenon, and infiltration current show muddiness.According to formula C=Δ L- (γs-γw), take γs=2.65 × 9.8 × 103N/
m3, γw=1.1 × 9.8 × 103N/m3, then can calculate soil cohesion be 18.05 × 103N/m3。
Fig. 4 is that the soil weight is 1.02g/cm3, soil infiltration flow and unit soil body head difference relation are measured, in unit
Head difference varies widely when being 1.79mm water columns/mm.Thus soil cohesion can be calculated as 1.396 × 103N/mm3。
The utility model gathers tested point soil pattern according to measure needs using cutting ring；On fixed sample and device, and
Free discharge is formed in outlet section；By adjusting water outlet height, different pressures head is obtained；Under different pressures head, profit
Unit time period is collected with graduated cylinder and goes out stream, records different periods outflow, you can obtain seepage flow flow under different hydraulic slopes；By
Darcy's law, you can obtain seepage flow flow under different hydraulic slopes, linear relationship is presented between hydraulic slope and seepage flow flow, works as water
After power gradient reaches a certain value, linear change will be no longer presented, corresponding pressure head, is that soil particle reaches particle cohesive force
Corresponding hydraulic slope is destroyed, while can see by water pipe, floating phenomenon is presented in soil particle, it was demonstrated that soil particle reaches outstanding
Floating critical condition, corresponding states is the critical condition of soil particle bond damage.
The experimental provision of the utility model is easy to operate, of low cost, using water outlet height is reduced, is formed by siphon
Pressure head, acts on the experiment soil body, carries out permeability test, while has evaded the disturbance that the lifting of the experiment soil body is formed, lifting
The convenience of measuring.The device is not suitable for the measure of soil particle cohesive force singly, and it is critical to simultaneously can be used for soil
Gradient research is permeated, has greatly widened the scope of application of instrument.
The above, is only the preferable embodiment of the utility model, and the scope of protection of the utility model is not limited to
This, any one skilled in the art can become apparent in the technical scope that the utility model discloses
Technical solution simple change or equivalence replacement each fall within the scope of protection of the utility model.
Claims (5)
1. a kind of device for measuring soil cohesion, it is characterised in that including water tank (1), sample installation system and discharging device
(10), overflow port (2) and water injection pipe (3) are set on the water tank (1), the sample installation system includes organic glass bullet
(4), downtake pipe (5), the second drainpipe (6), rubber stopper (7), cutting ring (8) and sealing ring (9), the organic glass taper
Body (4) is equipped with rubber stopper (7), and the downtake pipe (5), the second drainpipe (6) are located on rubber stopper (7), the cutting ring
(8) it is located at the lower section of organic glass bullet (4), sealing ring is equipped between the cutting ring (8) and organic glass bullet (4)
(9), second drainpipe (6) and discharging device (10) connection, the discharging device (10) are equipped with water outlet (14).
2. the device of measure soil cohesion according to claim 1, it is characterised in that on the downtake pipe (5)
Equipped with the first valve (11), second drainpipe (6) is equipped with the second valve (12).
3. the device of measure soil cohesion according to claim 1, it is characterised in that the discharging device (10) is half
Hard transparent sebific duct.
4. the device of measure soil cohesion according to claim 1, it is characterised in that the cutting ring (8) is high 53mm,
The standard cutting ring of internal diameter 70mm.
5. the device of measure soil cohesion according to claim 1, it is characterised in that the cutting ring (8) is equipped with lower cover,
The lower cover is perforated lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721092792.5U CN207263611U (en) | 2017-08-29 | 2017-08-29 | A kind of device for measuring soil cohesion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721092792.5U CN207263611U (en) | 2017-08-29 | 2017-08-29 | A kind of device for measuring soil cohesion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207263611U true CN207263611U (en) | 2018-04-20 |
Family
ID=61922577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721092792.5U Expired - Fee Related CN207263611U (en) | 2017-08-29 | 2017-08-29 | A kind of device for measuring soil cohesion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207263611U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340234A (en) * | 2017-08-29 | 2017-11-10 | 西北农林科技大学 | A kind of device and method for determining soil cohesion |
| CN110031399A (en) * | 2019-05-05 | 2019-07-19 | 中交疏浚技术装备国家工程研究中心有限公司 | The method of adhesion strength between cutter tooth and the soil body is inquired by fine grained soil internal cohesion |
-
2017
- 2017-08-29 CN CN201721092792.5U patent/CN207263611U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340234A (en) * | 2017-08-29 | 2017-11-10 | 西北农林科技大学 | A kind of device and method for determining soil cohesion |
| CN107340234B (en) * | 2017-08-29 | 2023-07-04 | 西北农林科技大学 | Device and method for measuring soil binding force |
| CN110031399A (en) * | 2019-05-05 | 2019-07-19 | 中交疏浚技术装备国家工程研究中心有限公司 | The method of adhesion strength between cutter tooth and the soil body is inquired by fine grained soil internal cohesion |
| CN110031399B (en) * | 2019-05-05 | 2021-08-24 | 中交疏浚技术装备国家工程研究中心有限公司 | Method for calculating adhesion force between cutter teeth and soil body by using cohesive force in fine-particle soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105547955B (en) | A kind of native permanent current speed infiltration blocking test method | |
| CN105588796B (en) | A kind of device of accurate quick measure soil permeability coefficient | |
| CN105158141B (en) | One kind is recycled coarse crack high speed seepage flow test device | |
| CN201130143Y (en) | Porous medium material permeability coefficient determinator | |
| CN206756653U (en) | Determine head and varying head soil permeability coefficient measure combination unit | |
| CN203606259U (en) | Device for determining infiltration rule of unsaturated soil | |
| CN103558136A (en) | System and method for testing rock damage and permeability under coupling effect of temperature stress and circumferential seepage | |
| CN204125898U (en) | The experimental rig of Dam Foundation Seepage under a kind of failure under earthquake action | |
| CN201747363U (en) | Coal bed gas well completion mode evaluating experimental apparatus | |
| CN102809642B (en) | Method for determining hydrogeological parameters of aquitard | |
| CN206223619U (en) | A kind of permeability coefficient of cement soil tester | |
| CN106153393A (en) | A kind of original position layering harvester of shallow water area column shaped deposit pore water | |
| CN204010441U (en) | Specific surface affects demonstrating experiment device to darcy flow | |
| CN207263611U (en) | A kind of device for measuring soil cohesion | |
| CN205280549U (en) | Chang shuitou ground body osmotic coefficient testing arrangement is moved in light perturbation | |
| CN103792175A (en) | Unsaturated rock-earth mass constant head reverse penetration testing method | |
| CN205246495U (en) | Test device is blockked up in normal velocity of flow infiltration of soil | |
| CN207263587U (en) | A kind of acid-base solution permeates saturation soil sample experimental rig | |
| CN106970181B (en) | Drainage consolidation test device and method for grouting slurry behind wall in stratum | |
| CN207096048U (en) | A kind of self-circulation type permeameter improves device | |
| CN203101231U (en) | Fast testing device for seepage coefficient of macroporous concrete | |
| CN203365432U (en) | Soil-water characteristic curve testing instrument applicable to special coarse-grained soil | |
| CN106840990A (en) | A kind of achievable permeability apparatus for becoming effect of water pressure | |
| CN115165702A (en) | Large-size soil body permeability test device and method capable of adjusting water head and seepage direction | |
| CN102680377B (en) | Test device for measuring rising heights and speeds of porous medium capillary water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180420 Termination date: 20180829 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |