CN206235513U - Suitable for the rock joint direct shear test system of CT three-dimensional real time scans - Google Patents
Suitable for the rock joint direct shear test system of CT three-dimensional real time scans Download PDFInfo
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- CN206235513U CN206235513U CN201621117448.2U CN201621117448U CN206235513U CN 206235513 U CN206235513 U CN 206235513U CN 201621117448 U CN201621117448 U CN 201621117448U CN 206235513 U CN206235513 U CN 206235513U
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- down cut
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Abstract
A kind of rock joint direct shear test system suitable for CT three-dimensional real time scans, including main machine frame, upper shear box, down cut box, whirligig and CT scan device；Rock joint test specimen is positioned between shear box and down cut box, and the top connection rotation pad of the upper shear box, the rotation pad is connected with the motion end of the normal direction loading device for applying normal pressure to rock joint test specimen；The down cut box is positioned on rotary bracket, horizontal loading device for applying cross shear to rock joint test specimen is fixed on rotary bracket, the motion end of the horizontal loading device is contradicted in the side of down cut box, and the rotary bracket is connected with the motion end of the whirligig；The rotary bracket, upper shear box, down cut box and rotation pad are in be coaxially disposed；The CT scan device includes being arranged at the radioactive source and detector of shear box opposite sides.The utility model has good stability, realizes three-dimensional imaging.
Description
Technical field
The utility model belongs to Geotechnical Engineering field, is related to a kind of rock shearing pilot system, specially one kind to be applied to
The rock joint direct shear test system of CT three-dimensional real time scans.
Background technology
Understand the shear property of rock joint water conservancy and hydropower exploitation, mining mineral resource, underground traffic, railway construction,
Nuclear waste storage and many it is related to have great importance in the field of Geotechnical Engineering.The failure by shear of rock joint, generally
It is due to the crack initiation of microfissure nearby of joint surface contact, develops and be finally mutually communicated to form what macroscopic cracking caused.Cause
This, studies extension, the Evolution of microfissure, and the failure by shear mechanism for understanding fully rock joint is significant.CT sweeps
Technology is retouched, the high accuracy scan image inside test specimen can be obtained in process of the test, so as to understand the change of test specimen internal structure
Law, for the mechanical property that test specimen is understood from microcosmic is provided directly and beneficial help.
Major part shearing equipment is applied to cylinder test specimen at present, can be less with the equipment of test cube test specimen, and phase
For cylinder test specimen, the stress distribution of cube specimen is more uniformly distributed, and the mechanics parameter for obtaining is more accurate.Enter to test specimen
During row CT scan, if there is the larger thing of other objects, particularly density between test specimen and CT radioactive sources or receiver
Blocking for body, then can have a strong impact on the quality and precision of imaging, so the instrument of many exploitations in the past is using lightweights such as carbon fibers
Material makes loading frame.However, although carbon fibre material is with tensile strength higher, bending resistance, measuring body intensity are simultaneously
Stability not high so that the integral rigidity of instrument is relatively low, being tested under influence condition of high ground stress.In general, joint plane is cut
Cut through and badly concentrate at the near surface of joint, so needing to develop a kind of joint partial denudation by test specimen test apparatus outside
To improve the quality of CT imagings.In addition, if not rotating test specimen in CT scan, then the letter of part two-dimensional cross-section is can only obtain
Breath, will realize three-dimensional imaging, it is necessary to test specimen or rotation CT radioactive sources are rotated in process of the test.
The content of the invention
In order to overcome the shortcomings of existing rock joint direct shear test system cannot three-dimensional imaging, less stable,
It is direct that the utility model provides a kind of rock joint suitable for CT three-dimensional real time scans of the three-dimensional imaging that has good stability, realizes
Shearing test system.
The utility model solves the technical scheme that its technical problem used：
A kind of rock joint direct shear test system suitable for CT three-dimensional real time scans, including for carrying boxshear apparatus
Main machine frame, the upper shear box for loading rock joint test specimen and down cut box, for realizing upper shear box, down cut
Whirligig and the CT scan device for realizing three-D CT scanning that box, horizontal loading device rotate together；
Rock joint test specimen is positioned between shear box and down cut box, the top connection rotating pad of the upper shear box
Piece, the rotation pad is connected with the motion end of the normal direction loading device for applying normal pressure to rock joint test specimen；Institute
State down cut box to be positioned on rotary bracket, the horizontal loading device for applying rock joint test specimen cross shear is fixed
On rotary bracket, the motion end of the horizontal loading device is contradicted in the side of down cut box, the rotary bracket with it is described
The motion end connection of whirligig；The rotary bracket, upper shear box, down cut box and rotation pad are in be coaxially disposed；
The CT scan device includes being arranged at the radioactive source and detector of shear box opposite sides.
Further, the upper shear box is positioned in the fixes sleeve for limiting upper shear box lateral movement, described solid
Determine sleeve to be arranged on the main machine frame.
Further, connected by rotation ball between the lateral wall of the upper shear box and the inwall of the fixes sleeve
Connect；Connected by rotation ball between the bottom surface of the down cut box and the working face of rotary bracket.
Preferably, the upper shear box and down cut box are matrix hollow circular cylinder, and inside inlays piece lengths respectively
1/5, the length of centre 3/5 of the test specimen exposes.It is of course also possible to be other shapes or size, as long as rock can be fixed
Joint test specimen.The test specimen can be cube specimen or cylinder test specimen.
Further, it is provided for measuring the Normal Displacement of test specimen between the upper shear box and the top board of main machine frame
Normal direction LVDT displacement transducers；The transverse direction of the shear displacemant of measurement test specimen is provided between the down cut box and rotary bracket
LVDT displacement transducers.
The main machine frame includes the column of base plate, top board and connecting bottom board and top board, Method for Installation in the middle of the top board
To loading device, the column is constituted by 4, and every two ends are respectively bolted on base plate and top board.
The beneficial effects of the utility model are mainly manifested in：
1) whirligig is used, 360 degree of rotation test specimens, obtain the isostructure three-dimensional of test specimen internal crack in shear history
Stereo-picture；
2) due to leaving space between upper and lower shear box, the joint part of rock sample can obtain without any shelter
Joint high definition, high accuracy three-dimensional CT scan image in itself；
3) the detrusion feature of measurable cube specimen and cylinder test specimen, while proof strength, does not influence
The effect of CT scan；
4) shearing force and normal pressure be by servo loading system control, can by computer programming realize it is various under the conditions of plus
Carry.
Brief description of the drawings
Fig. 1 is the utility model general assembly structural profile schematic diagram；
Fig. 2 is the top plan view at Fig. 1 dotted lines (during using cube specimen)；
Fig. 3 is down cut box and test specimen top view (during using cylinder test specimen)；
Fig. 4 is CT scan device side view.
In figure, 1- normal direction loading device (vertical jack)；2- roof bolts；3- top boards；4- fixes sleeves；5- normal direction
LVDT displacement transducers；6- rotates pad；The upper rotation balls of 7-；The upper shear boxs of 8-；9- test specimens (9-1, cube specimen, 9-2,
Cylinder test specimen, 9-3, filler)；10- rotary brackets；11- transverse direction LVDT displacement transducers；12- stationary fixtures；13- base plates；
14- drive components；15- columns；16- down cut boxes；17- transverse direction loading devices；18- polishing heads；Rotation ball under 19-；20- revolves
Rotating shaft；21-CT radioactive sources；22-CT detectors.
Specific embodiment
The utility model is further described below in conjunction with the accompanying drawings.
1~Fig. 4 of reference picture, a kind of rock joint direct shear test system suitable for CT three-dimensional real time scans, including
For carry the main machine frame of boxshear apparatus, the upper shear box for loading rock joint test specimen, down cut box, for being cut in realization
Cut whirligig and the CT scan dress for realizing three-D CT scanning that box, down cut box, horizontal loading device rotate together
Put.
The rock joint test specimen 9 is positioned between shear box 8, down cut box 16, and the top of the upper shear box 8 connects
Rotation pad 6 is connect, the rotation pad 6 is connected with the motion end of normal direction loading device 1；The upper shear box 8 be positioned over for
In the fixes sleeve 4 of shear box lateral movement in limitation, connected by upper rotation ball 7；The down cut box 16 is positioned over rotation
On bracket 10, connected by the lower rotation ball 19 of bottom；The horizontal loading device 17 is fixed on rotary bracket 10.
The whirligig be for be rotated bracket 10 rotation drive component 14, the rotary bracket 10 with it is described
Upper shear box 8, down cut box 16 and horizontal loading device 17 link, the rotary bracket 10, upper shear box 8, down cut box
16th, rotation pad 6 is in be coaxially disposed.
The CT scan device includes being arranged at the radioactive source 21 and detector 22 of shear box opposite sides.
The upper shear box 8, down cut box 16 are matrix hollow circular cylinder, and inside inlays the 1/ of the length of test specimen 9 respectively
5, the length of centre 3/5 of the test specimen exposes；The test specimen can be cube specimen or cylinder test specimen.
The motion end connection rotation pad 6 of the normal direction loading device 1, the rotation pad 6 revolves jointly with upper shear box 8
Turn；The fixes sleeve 4 is fixed on the top board 3 of main machine frame, the lateral movement of shear box 8 in limitation；The upper shear box 8 with
Rotation ball 7 is housed, it is therefore an objective to frictional resistance when shear box rotates and moves up and down in reduction between fixes sleeve 4；On cut
Cut and set between box 8 and top board 3 Normal Displacement that LVDT displacement transducers 5 measure test specimen.
The horizontal loading device 17 is arranged in rotary bracket 10, and shearing is transmitted by the downward shear box 16 of polishing head 18
Power；The downside of the down cut box 16 is equipped with rotation ball 19, it is therefore an objective to reduce frictional resistance during down cut 16 transverse movement of box；
The shear displacemant that LVDT displacement transducers 11 measure test specimen is set between the down cut box 16 and rotary bracket 10；The rotation
Bracket 10 drives horizontal loading device 17, upper and lower shear box 8,16, LVDT displacement transducers 11 to rotate together.
The main machine frame includes the column 15 of base plate 13, top board 3 and connecting bottom board and top board, peace in the middle of the top board
Dress normal direction loading device 1, the column is constituted by 4, and every two ends are fixed on base plate 13 and top board 3 with bolt 2 respectively.
In the present embodiment, the upper shear box 8 is matrix hollow circular cylinder, and upper shear box 8 inlays the 1/5 of the length of test specimen 9,
The upside of upper shear box 8 and the contact position of normal direction LVDT displacement transducers 5 set one layer of lubricious material；Can device cube in shear box
Body test specimen or cylinder specimen, the two ends of cube specimen 9-1 are directly embedded in shear box 8, down cut box 16, cylinder
The diameter of body test specimen 9-2 as the length of side of cube specimen 9-1, cylinder test specimen 9-2 and upper shear box 8, down cut box 16
Between space with packing material 9-3 fill.
The normal direction loading device 1 is fixed on top board 3, its motion end connection rotation pad 6, is rotated pad 6 and is above cut
Box 8 is cut to rotate jointly；Fixes sleeve 4 is fixed on top board 3, and upper shear box 8 is arranged in fixes sleeve 4, is equipped between the two
Upper rotation ball 7, it is therefore an objective to frictional resistance when shear box 8 is moved up and down and rotated in reduction；Upper LVDT displacement transducers 5 set
It is placed between top board 3 and upper shear box 8, measures the Normal Displacement of test specimen 9.
The horizontal loading device 17 is arranged in rotary bracket 10, and shearing is provided by the downward shear box 16 of polishing head 18
Power；Down cut box 16 inlays the 1/5 of the length of test specimen 9, so that 3/5 length exposes in atmosphere in the middle of test specimen 9, is put beneficial to CT
The direct irradiation of source 21 is penetrated in the joint part of test specimen 9, CT detectors 22 can receive ray；The downside of down cut box 16 is equipped with lower turn
Dynamic ball 19, it is therefore an objective to reduce frictional resistance when down cut box 16 is moved；The opposite side of down cut box 16 is solid with stationary fixture 12
Fixed transverse direction LVDT displacement transducers 11, the horizontal measurement head of LVDT displacement transducers 11 props up rotating frame 10, measures cutting for test specimen 9
Cut displacement；The rotary bracket 10 drive horizontal loading device 17, down cut box 16, LVDT displacement transducers 11, test specimen 9, on
Shear box 8 rotates together.
The upper rotation ball 7, lower rotation ball 19 are a kind of method of reducing friction resistance, can also use other method
To realize reducing the purpose of frictional resistance.
The main machine frame includes the column 15 of base plate 13, top board 3 and connecting bottom board and top board, and the column is about 15
Two ends bolt 2 is fixed between base plate 13 and top board 3, totally 4；Column, base plate, top board use high-strength steel.
Servo-controlled normal direction loading device 1 and servo-controlled horizontal loading device 17, respectively test specimen provide normal direction
Pressure and shearing force, maximum normal pressure can reach 30MPa, and maximum shear stress can reach 15MPa.
The whirligig is the drive component 14 for bracket rotation to be rotated, and rotary shaft 20 is arranged in base plate 13
The heart, rotary bracket 10 is fixed in rotation rotary shaft 20, when CT scan is carried out, axle 20 is rotated by drive component 14 and revolves
Turn, and then the test specimen rotation on bracket 10 and top is rotated, obtain the scan image of 360 degree of test specimen, can adjust as needed
The speed of rotation obtains accurate image.
The TT＆C system includes servo loading control system, LVDT displacement transducers, force snesor and electric machine controller；
Servo loading control system is used to carry out SERVO CONTROL to normal pressure and shearing force；In the surrounding of above-mentioned normal direction loading device 1,
4 normal direction LVDT displacement transducers 5 are symmetrical arranged between top board 3 and upper shear box 8, the Normal Displacement of test specimen 9 is measured；Above-mentioned
Transverse direction LVDT displacement transducers 11 are set between down cut box 16 and rotary bracket 10, the shear displacemant of test specimen 9 is measured；Jack
Pressure head on set force snesor be used for measure axial force；Electric machine controller is used to control rotating speed and the steering of whirligig.
Described CT scan device includes being arranged at the CT radioactive sources 21 and CT detectors 22 of the opposite sides of test specimen 9, radiation
, through the space above-mentioned main machine frame column, main machine frame is motionless and test specimen 9 rotates for line, the part near test specimen joint plane
It is not blocked, is easy to observe its internal destruction situation.
Claims (6)
1. it is a kind of suitable for CT three-dimensional real time scan rock joint direct shear test system, it is characterised in that：The experiment
System is included for carrying the main machine frame of boxshear apparatus, the upper shear box for loading rock joint test specimen and down cut box, using
In the realization whirligig that above shear box, down cut box, horizontal loading device rotate together and for realizing three-D CT scanning
CT scan device；
Rock joint test specimen is positioned between shear box and down cut box, the top connection rotation pad of the upper shear box,
The rotation pad is connected with the motion end of the normal direction loading device for applying normal pressure to rock joint test specimen；Under described
Shear box is positioned on rotary bracket, and the horizontal loading device for applying cross shear to rock joint test specimen is fixed on rotation
Ask on frame, the motion end of the horizontal loading device is contradicted in the side of down cut box, the rotary bracket and the rotation
The motion end connection of device；The rotary bracket, upper shear box, down cut box and rotation pad are in be coaxially disposed；
The CT scan device includes being arranged at the radioactive source and detector of shear box opposite sides.
2. as claimed in claim 1 suitable for the rock joint direct shear test system of CT three-dimensional real time scans, its feature
It is：The upper shear box is positioned in the fixes sleeve for limiting upper shear box lateral movement, and the fixes sleeve is installed
On the main machine frame.
3. as claimed in claim 2 suitable for the rock joint direct shear test system of CT three-dimensional real time scans, its feature
It is：Connected by rotation ball between the lateral wall of the upper shear box and the inwall of the fixes sleeve；The down cut
Connected by rotation ball between the bottom surface of box and the working face of rotary bracket.
4. as described in one of claims 1 to 3 suitable for CT three-dimensional real time scan rock joint direct shear test system,
It is characterized in that：The upper shear box and down cut box are matrix hollow circular cylinder, and inside inlays the 1/ of piece lengths respectively
5, the length of centre 3/5 of the test specimen exposes.
5. as described in one of claims 1 to 3 suitable for CT three-dimensional real time scan rock joint direct shear test system,
It is characterized in that：The normal direction of the Normal Displacement of measurement test specimen is provided between the upper shear box and the top board of main machine frame
LVDT displacement transducers；The horizontal LVDT of the shear displacemant of measurement test specimen is provided between the down cut box and rotary bracket
Displacement transducer.
6. as described in one of claims 1 to 3 suitable for CT three-dimensional real time scan rock joint direct shear test system,
It is characterized in that：The main machine frame includes the column of base plate, top board and connecting bottom board and top board, is installed in the middle of the top board
Normal direction loading device, the column is constituted by 4, and every two ends are respectively bolted on base plate and top board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621117448.2U CN206235513U (en) | 2016-10-13 | 2016-10-13 | Suitable for the rock joint direct shear test system of CT three-dimensional real time scans |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621117448.2U CN206235513U (en) | 2016-10-13 | 2016-10-13 | Suitable for the rock joint direct shear test system of CT three-dimensional real time scans |
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| Publication Number | Publication Date |
|---|---|
| CN206235513U true CN206235513U (en) | 2017-06-09 |
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| CN201621117448.2U Active CN206235513U (en) | 2016-10-13 | 2016-10-13 | Suitable for the rock joint direct shear test system of CT three-dimensional real time scans |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525575A (en) * | 2016-10-13 | 2017-03-22 | 绍兴文理学院 | Rock joint direct shear test system suitable for CT three-dimensional real-time scanning |
| CN108613872A (en) * | 2018-06-13 | 2018-10-02 | 山东科技大学 | Transparent rocks test specimen crack propagation monitors system and method |
| CN109540701A (en) * | 2018-12-14 | 2019-03-29 | 东北大学 | A kind of LVDT displacement sensor fixed mechanism applied to rock shearing test |
| CN109580364A (en) * | 2018-10-19 | 2019-04-05 | 中国科学院地质与地球物理研究所 | The rotatable rock mechanics experiment machine of heavy duty |
-
2016
- 2016-10-13 CN CN201621117448.2U patent/CN206235513U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525575A (en) * | 2016-10-13 | 2017-03-22 | 绍兴文理学院 | Rock joint direct shear test system suitable for CT three-dimensional real-time scanning |
| CN108613872A (en) * | 2018-06-13 | 2018-10-02 | 山东科技大学 | Transparent rocks test specimen crack propagation monitors system and method |
| CN108613872B (en) * | 2018-06-13 | 2019-03-12 | 山东科技大学 | Transparent rocks test specimen crack propagation monitors system and method |
| CN109580364A (en) * | 2018-10-19 | 2019-04-05 | 中国科学院地质与地球物理研究所 | The rotatable rock mechanics experiment machine of heavy duty |
| CN109540701A (en) * | 2018-12-14 | 2019-03-29 | 东北大学 | A kind of LVDT displacement sensor fixed mechanism applied to rock shearing test |
| CN109540701B (en) * | 2018-12-14 | 2021-08-17 | 东北大学 | Be applied to rock shear test's LVDT displacement sensor fixed establishment |
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