CN207586047U - A kind of geosynthetics direct shear test instrument - Google Patents
A kind of geosynthetics direct shear test instrument Download PDFInfo
- Publication number
- CN207586047U CN207586047U CN201721800338.0U CN201721800338U CN207586047U CN 207586047 U CN207586047 U CN 207586047U CN 201721800338 U CN201721800338 U CN 201721800338U CN 207586047 U CN207586047 U CN 207586047U
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- box
- geosynthetics
- down cut
- shear box
- upper shear
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model discloses a kind of geosynthetics direct shear test instruments, belong to geosynthetics detection device technical field, including pedestal, down cut box and upper shear box, it is characterized in that the upper shear box is arranged to up big and down small and is the truncated rectangular pyramids shape structure that inclined-plane the other three face is vertical face there are one face, setting down cut box below frictional layer, material layer is provided between down cut box and frictional layer, down cut cassette bottom portion sets sliding block, slider bottom setting is fluted, pedestal top is provided with the linear guide, and the beneficial effects of the utility model are：The cross section of the upper shear box is arranged to trapezoidal, avoids the gravel aggregation of frictional layer, it is excessive to cause local stress, leads to unbalance stress；The linear guide is arranged to cross section as convex, protrusion and fit depressions, and ball is provided between protrusion and groove, improves mechanical strength, increases the balance and stability of device.
Description
Technical field
The utility model belongs to geosynthetics detection device technical field, relates more specifically to a kind of geotechnique's synthesis material
Expect direct shear test instrument.
Background technology
Geosynthetics direct shear test is mainly to study the interface friction characteristics of geosynthetics and soil：Sample is put into
In shear box, upper box is fixed, and lower box can slide in the horizontal direction, apply pressure at right angle first, then to the lower box of shear box by
Grade applies horizontal force, until sample is cut up.Theoretically, the shear stress that horizontal addload system applies is equal to geotechnique's synthesis material
The interface friction force of material and soil, but in fact, include shear box in the interface friction force of surveyed geosynthetics and soil
Frictional force between down cut box.Thus, the interface friction force measured by geosynthetics direct shear test is bigger than normal.However,
Upper and lower shear box is separated by a simple support system, realizes the single friction of geosynthetics and the soil body, compared with
The good interface friction force for solving the problems, such as that experiment is measured is bigger than normal.Such direct shear apparatus principle is simple, easy to make, at low cost
It is honest and clean, and old-fashioned direct shear apparatus is easy to reequip.
The china national practical new-type patent of Patent No. 201520437026.2 discloses a kind of direct shear apparatus, solves well
Problem above, but the slip between the down cut box and pedestal of the device uses traditional roller bearing or bearing, this structure is steady
Qualitative and balance is bad, and mechanical strength is poor, when the high pressure for the device that is under pressure, unbalance stress easily occurs, so as to lead
The damage of roller bearing or bearing is caused, particularly gravel piles up phenomenon under the action of upper shear box, so as to which local stress is excessive,
Discontinuity equalization.
Invention content
To solve the above problems, overcome the deficiencies in the prior art, the utility model provides that a kind of test data is accurate, knot
Structure stability is strong, balance is good and the geosynthetics direct shear test instrument of high mechanical strength, can effectively solve stability
It is bad with balance, the problem of mechanical strength is poor and test error is big.
The utility model solve above-mentioned technical problem specific technical solution be：The geosynthetics direct shear test
Instrument, including pedestal, down cut box and upper shear box, it is characterised in that the upper shear box is arranged to up big and down small and there are one faces
For the truncated rectangular pyramids shape structure that inclined-plane the other three face is vertical face, the moving direction of the downward shear box in inclined-plane is obliquely installed, under
The bottom surface of shear box and upper shear box top surface shape are identical and equal in magnitude, and pressing plate, the pressing plate are provided on the upside of upper shear box
Top is provided with pressure apparatus, sets frictional layer below pressing plate, the frictional layer is arranged on inside shear box, the upper shearing
Setting down cut box below box is provided with material layer, the down cut cassette bottom portion fixed setting between down cut box and frictional layer
There is the sliding block of preset quantity, slider bottom setting is fluted, and the pedestal top is provided with the linear guide, and the linear guide is set
Cross section is set to as convex, protrusion, the protrusion and fit depressions, the protrusion and groove are provided at the top of the linear guide
Between be provided with ball.
Further, the side of the down cut box is provided with column, and column bottom is fixedly linked with pedestal, column one
Side is fixedly linked with upper shear box.
Further, the frictional layer material is arranged to gravel.
Further, the size of the pressing plate and the upper surface of upper shear box are in the same size.
Further, it is provided with lubricating oil between the protrusion, groove and ball.
The beneficial effects of the utility model are：The cross section of the upper shear box is arranged to trapezoidal, avoids frictional layer
Gravel aggregation, it is excessive to cause local stress, leads to unbalance stress；The linear guide is arranged to cross section as convex, convex
Portion and fit depressions, are provided with ball between protrusion and groove, improve mechanical strength, increase the balance of device and steady
It is qualitative.
Description of the drawings：
Attached drawing 1 is the utility model structure diagram；
Attached drawing 2 is the utility model structure diagram；In attached drawing：
1. the linear guide, 2. down cut boxes, 3. pressing plates, shear box, 5. pressure apparatus, 6. frictional layers, 7. on 4.
Material layer, 8. sliding blocks, 9. pedestals, 10. balls, 11. grooves, 12. protrusions.
Specific embodiment：
To make the purpose, technical scheme and advantage that the utility model is implemented clearer, 1-2 is more complete with reference to the drawings
Describe to face.In the description to the utility model, it is to be understood that term " " center ", " on ", " under ", "left", "right",
The orientation or position relationship of the instructions such as " rear ", " lower-left ", " upper right ", " outer " be based on orientation shown in the drawings or position relationship,
It is for only for ease of description the utility model and simplifies description rather than instruction or imply that signified device or element must have
Specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to scope of protection of the utility model.This
Outside, term " first ", " second ", " third " are only used for description purpose, and it is not intended that instruction or hint relative importance.
Specific embodiment of the present utility model：The geosynthetics direct shear test instrument, including pedestal 9, under cut
Cut box 2 and upper shear box 4, it is characterised in that the upper shear box 4 is arranged to up big and down small and is inclined-plane the other three there are one face
Face is the truncated rectangular pyramids shape structure in vertical face, and the moving direction of the downward shear box 2 in inclined-plane is obliquely installed, the bottom of down cut box 2
Face and upper 4 top surface shape of shear box are identical and equal in magnitude, and upper 4 upside of shear box is provided with pressing plate 3, and 3 top of pressing plate is set
Pressure apparatus 5,3 lower section setting frictional layer 6 of pressing plate are equipped with, the frictional layer 6 is arranged on inside shear box 4, the upper shearing
4 lower section setting down cut box 2 of box, is provided with material layer 7,2 bottom of down cut box is consolidated between down cut box 2 and frictional layer 6
Surely the sliding block 8 of preset quantity is provided with, 8 bottom of sliding block setting fluted 11,9 top of pedestal is provided with the linear guide 1, institute
It states the linear guide 1 and is arranged to cross section as convex, the top of the linear guide 1 is provided with protrusion 12, the protrusion 12 and groove 11
It matches, ball 10 is provided between the protrusion 12 and groove 11.
Further, the side of the down cut box 2 is provided with column, and column bottom is fixedly linked with pedestal 9, column
Side is fixedly linked with upper shear box 4.
Further, 6 material of frictional layer is arranged to gravel.
Further, the size of the pressing plate 3 and the upper surface of upper shear box 4 are in the same size.
Further, it is provided with lubricating oil between the protrusion 12, groove 11 and ball 10.
In use, concrete operations are as follows：
1. material layer 7 is placed between down cut box 2 and upper shear box 4, the height of adjusting post, shear box 4 in adjusting
Height；
2. laying pressing plate 3 on fine sand gravel, then fine sand gravel will be uniformly arranged in material layer 7, pressure apparatus 5 is being pressed in pressing plate
On 3；
3. pulling down cut box 2, protrusion 12, groove 11 occur to slide relatively with ball 10, down cut box 2 and upper shear box
4 occur relative displacements, and so as to measure pulling force from tension tester, the cross section of upper shear box 4 is arranged to trapezoidal, and fine sand gravel exists
As relative displacement occurs for upper shear box 4 in upper shear box 4, small interior cycle is formed, gravel aggregation is avoided, causes part
Stress is excessive, leads to unbalance stress.
Claims (5)
1. a kind of geosynthetics direct shear test instrument, including pedestal（9）, down cut box（2）With upper shear box（4）, feature
It is the upper shear box（4）It is arranged to open hollow housing up and down, upper shear box（4）Be arranged to it is up big and down small and there are one
Face is the truncated rectangular pyramids shape structure that inclined-plane the other three face is vertical face, the downward shear box in inclined-plane（2）Moving direction inclination set
It puts, down cut box（2）Bottom surface and upper shear box（4）Top surface shape is identical and equal in magnitude, upper shear box（4）Upside is provided with
Pressing plate（3）, the pressing plate（3）Top is provided with pressure apparatus（5）, pressing plate（3）Lower section sets frictional layer（6）, the frictional layer
（6）It is arranged on shear box（4）Inside, the upper shear box（4）Lower section sets down cut box（2）, down cut box（2）With friction
Layer（6）Between be provided with material layer（7）, the down cut box（2）Bottom is fixedly installed the sliding block of preset quantity（8）, sliding block
（8）Bottom setting is fluted（11）, the pedestal（9）Top is provided with the linear guide（1）, the linear guide（1）It is arranged to
Cross section is convex, the linear guide（1）Top be provided with protrusion（12）, the protrusion（12）With groove（11）It matches, institute
State protrusion（12）With groove（11）Between be provided with ball（10）.
2. geosynthetics direct shear test instrument according to claim 1, it is characterised in that the down cut box（2）'s
Side is provided with column, column bottom and pedestal（9）It is fixedly linked, column side and upper shear box（4）It is fixedly linked.
3. geosynthetics direct shear test instrument according to claim 1, it is characterised in that the frictional layer（6）Material
It is arranged to gravel.
4. geosynthetics direct shear test instrument according to claim 1, it is characterised in that the pressing plate（3）Size
With upper shear box（4）Upper surface it is in the same size.
5. geosynthetics direct shear test instrument according to claim 1, it is characterised in that the protrusion（12）, groove
（11）With ball（10）Between be provided with lubricating oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721800338.0U CN207586047U (en) | 2017-12-21 | 2017-12-21 | A kind of geosynthetics direct shear test instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721800338.0U CN207586047U (en) | 2017-12-21 | 2017-12-21 | A kind of geosynthetics direct shear test instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207586047U true CN207586047U (en) | 2018-07-06 |
Family
ID=62739723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721800338.0U Active CN207586047U (en) | 2017-12-21 | 2017-12-21 | A kind of geosynthetics direct shear test instrument |
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| Country | Link |
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| CN (1) | CN207586047U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781620A (en) * | 2019-03-29 | 2019-05-21 | 长安大学 | A kind of pitch cohesive strength measuring method |
-
2017
- 2017-12-21 CN CN201721800338.0U patent/CN207586047U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781620A (en) * | 2019-03-29 | 2019-05-21 | 长安大学 | A kind of pitch cohesive strength measuring method |
| CN109781620B (en) * | 2019-03-29 | 2021-08-17 | 长安大学 | Asphalt cohesion determination method |
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