CN110196194A - A kind of large area field direct shear test equipment - Google Patents
A kind of large area field direct shear test equipment Download PDFInfo
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- CN110196194A CN110196194A CN201910558160.0A CN201910558160A CN110196194A CN 110196194 A CN110196194 A CN 110196194A CN 201910558160 A CN201910558160 A CN 201910558160A CN 110196194 A CN110196194 A CN 110196194A
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- shearing force
- jack
- box
- force box
- large area
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- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 238000010008 shearing Methods 0.000 claims abstract description 61
- 229910000831 Steel Inorganic materials 0.000 claims description 42
- 239000010959 steel Substances 0.000 claims description 42
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 11
- 239000011120 plywood Substances 0.000 claims description 3
- 238000009533 lab test Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of large area field direct shear test equipment, belong to construction test apparatus field.Including be arranged in test pits in and be sleeved on the shearing force box on the outside of sample, setting shearing force box top and with the vertically disposed Normal stress device of shearing force box, setting test pits between crater wall and shearing force box and with the vertically disposed shear load device of shearing force box and measuring device, the relative movability that slide plate is rolled in the present invention makes shearing force box and Normal stress device be always positioned at same normal, eccentric load-bearing caused by avoiding because of the reasons such as inertia or dislocation movement, the present invention is directly tested at the scene simultaneously, therefore native state can more be met compared with laboratory test, the test result obtained is more in line with the technical requirements of Practical Project.
Description
Technical field
The present invention relates to construction test apparatus fields, and in particular to a kind of large area field direct shear test equipment.
Background technique
In the evaluation of foundation bearing capacity, soil-slope and subgrade stability, the Shear Strength Index of Rock And Soil is most important
Mechanics parameter.As the Rock And Soil of structure foundation, if generate sliding or part cut up area's development cause it is excessive or uneven
Even foundation deformation can all cause the destruction of superstructure or influence its normal use.The test site of existing direct shear test is big
Part is laboratory test, and the undisturbed of laboratory test is usually to be obtained at the scene with sleeve, is then pressed into sample with jack
In shearing force box, or lower sleeve is first unloaded, be then placed in shearing force box, the undisturbed that this mode obtains easily is disturbed, cannot be complete
The virtual condition for reflecting the live soil body indoors in shear history, if volume change occurs for sample, can generate at its contact point
Frictional force, and the frictional force can not in test measure, so that direct stress and practical additional direct stress on shear surface
It is inconsistent, the correct test of soil strength is affected,
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of large area field direct shear test equipment, particular technique sides
Case is as follows:
A kind of large area field direct shear test equipment, including be arranged in test pits in and be sleeved on the shearing force box on the outside of sample,
Setting is being tested pits between crater wall and shearing force box simultaneously on shearing force box top and with the vertically disposed Normal stress device of shearing force box, setting
With the vertically disposed shear load device of shearing force box and measuring device；Normal stress device successively wraps from bottom to up from shearing force box
It includes and rolls slide plate, normal direction jack, counter-force group；Shear load device include crater wall backing plate, be arranged in it is tangential on crater wall backing plate
Jack and the press steel plate being arranged between tangential jack and shearing force box；Measuring device includes setting on rolling slide plate
Multiple groups normal direction sedimentometer and horizontal displacement instrument of the shearing force box far from tangential jack side is set.
Counter-force group is very heavy to normal direction in the present invention jacks up reversed supporting role, after the starting of normal direction jack to roll slide plate with
And sample applies normal pressure.Then tangential pressure jack using crater wall of testing pits as counter-force pedestal, cutting by tangential jack
The point of application on power box is placed on the central point of shearing force box.The forced direction of tangential jack passes through in sample preshearing face
The heart, tangential jack pair shearing force box apply pressure and carry out shearing test to sample.Normal direction sedimentometer and horizontal displacement instrument simultaneously
The displacement of sample normal direction and horizontal direction is observed respectively.
Preferably, being equipped with the fine sand layer in gap between filling shearing force box and sample in shearing force box.
It is thin that the present invention passes through the powder being arranged between shearing force box and sample and for filling gap between shearing force box and sample
Layer of sand avoids the gap between shearing force box and sample from impacting test, reduces test error.
Thin sand is equipped between skateboard bottom and sample top surface preferably, rolling.
The present invention, which passes through the thin sand being arranged in roll between skateboard bottom and sample top surface, to be made to roll skateboard bottom and cut
Power box top is parallel, avoids eccentric load-bearing.
Preferably, counter-force group includes that the counter-force girder steel on normal direction jack top is arranged in and is arranged in counter-force girder steel two
The earth anchor at end.
Preferably, counter-force girder steel stress point, normal direction jack force application center point, rolling slide plate central point, test specimen center
Point is arranged on same central axes.
The present invention by will counter-force girder steel stress point, normal direction jack force application center point, roll slide plate central point, in test specimen
Heart point is arranged on same central axes, avoids present invention bias load-bearing caused by inertia or the reasons such as dislocation is mobile due to influences to try
Test result.
Preferably, being equipped with vertical stress sensor between normal direction jack and counter-force girder steel.
The present invention passes through the vertical stress sensor being arranged between normal direction jack and counter-force girder steel, is convenient for testing crew
Observe the output loads of normal direction jack.
Preferably, being equipped with shear stress sensor between tangential jack and press steel plate.
The present invention, which passes through, to be arranged in tangential jack and presses the shear stress sensor between steel plate, is seen convenient for testing crew
Survey the output loads of tangential jack.
Preferably, press steel plate bottom end pad is equipped with plywood.
The present invention is supported effect to press steel plate by the plywood that pad is located at press steel plate bottom end, prevents from pressing
Normal Displacement occurs during the test for steel plate.
The invention has the following advantages:
Counter-force group is very heavy to normal direction in the present invention jacks up reversed supporting role, after the starting of normal direction jack to roll slide plate with
And sample applies normal pressure, the relative movability that the rolling slide plate between sample and normal direction jack is arranged in makes shearing force box
It is always positioned at same normal with Normal stress device, eccentric load-bearing caused by avoiding because of the reasons such as inertia or dislocation movement.Tangentially
For pressure jack using crater wall of testing pits as counter-force pedestal, the point of application of the tangential jack on shearing force box is placed in shearing force box
On central point.The forced direction of tangential jack applies pressure by sample preshearing face center, tangential jack pair shearing force box
And shearing test is carried out to sample.Normal direction sedimentometer and the displacement to sample normal direction and horizontal direction respectively of horizontal displacement instrument simultaneously
It is observed.The present invention directly tests at the scene, therefore can more meet native state compared with laboratory test, the examination obtained
Test the technical requirements that result is more in line with Practical Project.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is cross-sectional view of the invention；
Fig. 3 is the partial enlarged view in Fig. 2 at A.
In figure: 1- shearing force box；2- Normal stress device；3- shear load device；4- measuring device；21- rolls slide plate；
22- normal direction jack；23- counter-force group；31- crater wall backing plate；The tangential jack of 32-；33- presses steel plate；41- normal direction sedimentometer；
42- horizontal displacement instrument；5- fine sand layer；6- thin sand；231- counter-force girder steel；232- earth anchor；7- vertical stress sensor；8- is cut
Strain gauge；9- plank.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Embodiment
Referring to Fig. 1 to Fig. 3, the present invention include be arranged in test pits in and be sleeved on the outside of sample shearing force box 1, setting cutting
1 top of power box and with the vertically disposed Normal stress device 2 of shearing force box 1, setting test pits between crater wall and shearing force box 1 and with cut
The vertically disposed shear load device 3 of power box 1, the measuring device 4 for observing the displacement of sample during the test.Normal direction
Load means 2 are used to apply sample normal pressure, and shear load device 3 applies pressure to shearing force box 1 and cuts to sample
Cut test.Measuring device 4 includes that the multiple groups normal direction sedimentometer 41 being arranged in roll on slide plate 21 and setting are separate in shearing force box 1
The horizontal displacement instrument 42 of tangential 32 side of jack.Normal direction sedimentometer 41 and horizontal displacement instrument 42 are respectively to sample normal direction and level
The displacement in direction is observed, and horizontal displacement instrument 42 is dial gauge.
With further reference to Fig. 2 and Fig. 3, Normal stress device 2 include be arranged in 1 top of shearing force box rolling slide plate 21 and
The normal direction jack 22 for rolling 21 top of slide plate is set, roll slide plate 21 by upper steel plate, lower steel plate and is arranged in upper steel plate
Composition is arranged in rolling between lower steel plate.The output end of normal direction jack 22 is connect with slide plate 21 is rolled, and normal direction jack 22
Base end be equipped with counter-force group 23 for playing a supportive role to normal direction jack 22.Be equipped in shearing force box 1 filling shearing force box 1 with
The fine sand layer 5 in gap between sample.The present invention by be arranged between shearing force box 1 and sample and for fill shearing force box 1 with
The fine sand layer 5 in gap, avoids the gap between shearing force box 1 and sample from impacting test between sample, reduces test
Error.Roll and be equipped with thin sand 6 between 21 bottom surface of slide plate and sample top surface, the present invention by setting roll 21 bottom surface of slide plate with
Thin sand 6 between sample top surface keeps rolling 21 bottom surface of slide plate parallel with 1 top surface of shearing force box, avoids eccentric load-bearing.
With further reference to Fig. 2 and Fig. 3, counter-force group 23 include be arranged in the counter-force girder steel 231 on 22 top of normal direction jack with
And the earth anchor 232 at 231 both ends of counter-force girder steel is set.By first installing counter-force girder steel 231, then with earth anchor 232 be screwed into soil into
One step reinforces counter-force girder steel 231.231 stress point of counter-force girder steel, rolls 21 center of slide plate at 22 force application center point of normal direction jack
Point, test specimen central point are arranged on same central axes.By by 231 stress point of counter-force girder steel, 22 force application center of normal direction jack
Point rolls 21 central point of slide plate, the setting of test specimen central point on same central axes, avoids the present invention because of inertia or dislocation movement etc.
Bias load-bearing caused by reason and influence test result.It is equipped between normal direction jack 22 and counter-force girder steel 231 convenient for test people
The vertical stress sensor 7 of the output loads of member's observation normal direction jack 22.
With further reference to Fig. 2 and Fig. 3, shear load device 3 includes that the crater wall backing plate 31 tested pits in crater wall, setting is arranged in
In the tangential jack 32 on crater wall backing plate 31 and the press steel plate 33 being arranged between tangential jack 32 and shearing force box 1.
Crater wall face asks smooth and crater wall backing plate 31 and crater wall to be in close contact, and tangential jack 32 makees counter-force bottom using crater wall of testing pits
The rigidity of seat, the area of crater wall backing plate 31 and tangential 32 support rod of jack meets rigidity requirement.The piston of tangential jack 32
Jacking direction is consistent with 1 bottom surface direction of shearing force box.Shear stress is equipped between tangential jack 32 and press steel plate 33 to sense
Device 8.By the way that tangential jack 32 is arranged in and presses the shear stress sensor 8 between steel plate 33, cut convenient for testing crew observation
To the output loads of jack 32.
With further reference to Fig. 2 and Fig. 3, presses steel plate 33 and guarantee that shear box has enough rigid under the action of tangential force
Degree, does not cause shearing force box 1 to generate excessive deformation, the point of application of the tangential jack 32 on shearing force box 1 is placed in shearing force box 1
On central point, the action direction of tangential force passes through sample preshearing face center.It presses 33 bottom end of steel plate pad and is equipped with two layers of plank 9.It is logical
Cross pad be located at press 33 bottom end of steel plate 9 pairs of press steel plates 33 of plank be supported effect, prevent press steel plate 33 testing
Normal Displacement occurs in journey.Counter-force girder steel 231 plays reversed supporting role, normal direction jack 22 to normal direction jack 22 in the present invention
To slide plate 21 and sample application normal pressure is rolled after starting, tangential pressure jack is using crater wall of testing pits as counter-force bottom
Seat, tangential jack 32 is on the central point that the point of application on shearing force box 1 is placed in shearing force box 1.The masterpiece of tangential jack 32
With direction by sample preshearing face center, tangential jack 32 applies pressure to shearing force box 1 and carries out shearing test to sample.This
Invention is directly tested at the scene, therefore can more meet native state compared with laboratory test, and the test result obtained is more
Meet the technical requirements of Practical Project.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of large area field direct shear test equipment, which is characterized in that in testing pits and be sleeved on the outside of sample including setting
Shearing force box (1), setting shearing force box (1) top and with the vertically disposed Normal stress device (2) of shearing force box (1), setting exist
Between crater wall of testing pits and shearing force box (1) and with the vertically disposed shear load device (3) of shearing force box (1) and measuring device (4)；
The Normal stress device (2) successively includes rolling slide plate (21), normal direction jack from shearing force box (1) from bottom to up
(22), counter-force group (23)；
The shear load device (3) includes the tangential jack (32) of crater wall backing plate (31), setting on crater wall backing plate (31)
And the press steel plate (33) being arranged between tangential jack (32) and shearing force box (1)；
The measuring device (4) includes that multiple groups normal direction sedimentometer (41) and setting of the setting in rolling slide plate (21) are shearing
Horizontal displacement instrument (42) of the box (1) far from tangential jack (32) side.
2. large area field direct shear test equipment according to claim 1, which is characterized in that set in the shearing force box (1)
There is the fine sand layer (5) in gap between filling shearing force box (1) and sample.
3. large area field direct shear test equipment according to claim 1, which is characterized in that rolling slide plate (21) bottom
Thin sand (6) are equipped between face and sample top surface.
4. large area field direct shear test equipment according to claim 1, which is characterized in that the counter-force group (23) includes
Be arranged normal direction jack (22) top counter-force girder steel (231) and setting counter-force girder steel (231) both ends earth anchor
(232)。
5. large area field direct shear test equipment according to claim 4, which is characterized in that the counter-force girder steel (231)
Stress point, normal direction jack (22) force application center point roll slide plate (21) central point, the setting of test specimen central point in same central axes
On.
6. large area field direct shear test equipment according to claim 4, which is characterized in that the normal direction jack (22)
Vertical stress sensor (7) are equipped between counter-force girder steel (231).
7. large area field direct shear test equipment according to claim 1, which is characterized in that the tangential jack (32)
Shear stress sensor (8) are equipped between press steel plate (33).
8. large area field direct shear test equipment according to claim 1, which is characterized in that press steel plate (33) bottom
End pad is equipped with plywood (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910558160.0A CN110196194A (en) | 2019-06-26 | 2019-06-26 | A kind of large area field direct shear test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910558160.0A CN110196194A (en) | 2019-06-26 | 2019-06-26 | A kind of large area field direct shear test equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110196194A true CN110196194A (en) | 2019-09-03 |
Family
ID=67755177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910558160.0A Pending CN110196194A (en) | 2019-06-26 | 2019-06-26 | A kind of large area field direct shear test equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110196194A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203894122U (en) * | 2014-01-01 | 2014-10-22 | 张茂省 | Large in-situ shearing device for saturated soil body |
| CN204439474U (en) * | 2015-04-17 | 2015-07-01 | 辽宁有色勘察研究院 | The field direct shear test device of landslide rock mass shearing strength |
| CN210376011U (en) * | 2019-06-26 | 2020-04-21 | 四川冶金建筑工程质量有限公司 | Large-area on-site direct shear test equipment |
-
2019
- 2019-06-26 CN CN201910558160.0A patent/CN110196194A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203894122U (en) * | 2014-01-01 | 2014-10-22 | 张茂省 | Large in-situ shearing device for saturated soil body |
| CN204439474U (en) * | 2015-04-17 | 2015-07-01 | 辽宁有色勘察研究院 | The field direct shear test device of landslide rock mass shearing strength |
| CN210376011U (en) * | 2019-06-26 | 2020-04-21 | 四川冶金建筑工程质量有限公司 | Large-area on-site direct shear test equipment |
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