CN103674833A - Simple shearing test method and device for rock-concrete cement face - Google Patents
Simple shearing test method and device for rock-concrete cement face Download PDFInfo
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- CN103674833A CN103674833A CN201310632690.8A CN201310632690A CN103674833A CN 103674833 A CN103674833 A CN 103674833A CN 201310632690 A CN201310632690 A CN 201310632690A CN 103674833 A CN103674833 A CN 103674833A
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Abstract
The invention relates to a simple shearing test method and device for a rock-concrete cement face. A to-be-detected rock-concrete cement test piece is vertically arranged, a horizontal shearing force is applied on the rock-concrete cement face through a power transmission screw rod, and maximum strain of a sensor during the shearing process is collected by the strain sensor arranged on the power transmission screw rod; the axial lines of the power transmission screw rod and the strain sensor are positioned on the same horizontal line, and a cambered surface attached to the power transmission screw rod is arranged at the bottom of the strain sensor. The device coordinates with a press to work, the axial load is applied through the press, the power transmission screw rod is screwed in to apply a shearing load to achieve the shearing of the rock-concrete cement surface, the operation is simple, and the use is convenient.
Description
Technical field
The present invention relates to a kind of device of Material Testing Machine, belong to rock mechanics, Geotechnical Engineering test and part of detecting, particularly disclose a kind of rock and concrete cement plane shearing test device, can be used for testing the Shear Strength of two media cement plane.
Background technology
In pile foundation engineering field, the rubbing characteristics of research end-bearing pile pile body and basement rock scar has important directive significance for the design of pile foundation.The shear failure of the cement plane of concrete pile body and rock mass is a kind of common failure mode.In existing country and department's standard, mostly only pay close attention to the structural plane Shear Strength of rock mass itself, and test unit and the implementation method of the Shear Strength of the rock that there is no which normalized illustration and concrete cement plane.Therefore,, under existing technical conditions, major part needs the Shear Strength test of study of rocks and concrete cement plane all on rock direct shear apparatus, to complete.
Tongji University once proposed the large-scale direct shear test device in scene of a kind of concrete and basement rock Shear Test on Cemented Surface intensity, this device is mainly used for the anchorage of on-site measurement suspension bridge and the friction factor of basement rock, but for pile foundation under water, this device just cannot be implemented shearing manipulation, and there is complex structure in site test device, operating difficulties, test period is long, the defects such as test data is unstable, thereby be necessary with indoor direct shear test, on-the-spot test findings to be verified.The scientific research institution such as Sichuan University, Hohai University also proposed some and coordinates pressure testing machine to carry out the easy device of shear test, but these devices are main or carry out shear test for rock mass discontinuity, and device complex structure, DATA REASONING is accurate not, cannot carry out the shear test of rock and concrete cement plane.
In view of the Shear Strength of indoor rock and concrete cement plane has important directive significance for Practical Project, particularly the degree of roughness of cement plane rock mass, basement rock type, strength grade of concrete etc. are larger on the Shear Strength impact of cement plane, existing testing regulations and country or department's standard there is no clearly regulation to this type of test, therefore propose rock and agent on crack resistance of concrete is cut off the test unit of intensity.
Summary of the invention
Above shortcoming in view of prior art, the object of the present invention is to provide a kind of simple rock and concrete cement plane shearing test method and device, solution, in the situation that there is no rock direct shear apparatus, adopts pressing machine and this easy device co-operation to carry out the technical matters of shear test.
The concrete implementation of the present invention is such:
A kind of simple and easy rock and concrete cement plane shearing test method; Shear Strength for detection of two media cement plane; it is characterized in that; the cementing test specimen of detected rock-concrete is vertically arranged; by power transmission screw rod, at two media cement plane place, impose horizontal shear force, by the maximum strain that is placed in the strain transducer collection shear history sensor of power transmission screw rod; In the same horizontal line, sensor base has the cambered surface with the laminating of power transmission screw rod for described power transmission screw rod and sensor axis.
The present invention also aims to provide for above-mentioned experimental technique the device for carrying out said of simple and feasible, its concrete means are:
Simple and easy rock and the concrete cement plane shearing test device of realizing claim 1 method, comprise base clamp, power transmission screw mechanism, sensor mechanism; Described base clamp is comprised of device pedestal 1 and the test specimen clamping hole slot 9 being arranged on device pedestal; Power transmission screw rod 3 is fixed on power transmission screw rod 3 by web joint 2; By four form-strain rosettes of foil gauge R1, R2, R3, R4 10, be disposed radially on power transmission screw rod 3; The geometric center of strain rosette 10 and 3 deads in line of power transmission screw rod.
Adopt method and apparatus of the present invention, by with pressing machine cooperating, realized and under the condition that there is no rock shearing instrument, completed the object that rock and agent on crack resistance of concrete are cut off.By the axis centering of power transmission screw rod and sensor, can realize shear load evenly applies; By sensor, shear load is applied on rock and concrete theoretical cement plane, has realized shear failure and occurred along cement plane; By the strain of pick-up transducers, be converted into the size of concrete shear load, the destruction shear load on can accurate Calculation cement plane.
Apparatus of the present invention exterior structure is simple and easy, and processing is simple, and the function of whole device each several part is clear, and test operation is simple; DATA REASONING gathers strain by strainmeter and is converted into load again, the data of surveying accurate, error is little, has very high fiduciary level.
Accompanying drawing explanation:
Partial sectional view when Fig. 1 is test unit experiment of the present invention.
Fig. 2 is the elevation drawing of test unit of the present invention.
Fig. 3 is the vertical view of Fig. 2.
Fig. 4 is the structural map of sensor.
Fig. 5 is the foil gauge wiring diagram on sensor 4
In figure: 1-device pedestal; 2-web joint; 3-power transmission screw rod; 4-sensor; 5-power transmission screw rod screw; Rock in 6-test specimen; Concrete in 7-test specimen; 8-rock and concrete theoretical cement plane; 9-base hole slot; 10-strain rosette, 11-power transmission screw end head; Position and wiring diagram that R1, R2, R3, R4 are foil gauge.
Embodiment
In conjunction with Fig. 2 and Fig. 3, simple and easy shearing test device comprises: device pedestal 1, web joint 2, power transmission screw rod 3, sensor 4, power transmission screw rod screw 5, base hole slot 9, strain rosette 10.
Device pedestal 1 adopts 169mm * 100mm * 47mm entity steel, at its right-hand member, opens φ 49.8mm base hole slot 9 for fixing test specimen.Left end and web joint 2 welding, weld grinding polishing.Web joint is opened M16 bolt hole 5 in center centered by 50mm place, plate top, and power transmission screw rod 3 passes bolt hole 5 afterwards and sensor 4 centerings apply shear load.
What the foil gauge on sensor was measured is strain, strain should be converted into power, is also shear load, therefore need demarcate sensor, finds out the theoretical relationship of strain stress and shear load Q.Because shear load is very little, in the elastic strain range of sensor material, Q～ε is linear, finds out the Proportional coefficient K of Q and ε by demarcation.In practical measurement process, the maximum strain ε of sensor while gathering cement plane destruction by static strain testing system, shear load is exactly Q=K ε.
In process of the test, test specimen is made to mark footpath 50mm, height 100mm, theoretical cement plane is at the cylinder specimen of center; Containing rock one end embedding device base, adopt a general material pressure testing machine to apply specific xial feed to test specimen concrete end the test specimen preparing; Sensor, power transmission screw rod, test specimen are connected by accompanying drawing 1 successively, be slowly screwed into left end power transmission screw rod and apply shear load, until test specimen is along rock and concrete cement plane shear failure.
This easy device has obtained good effect in certain navigation channel upgrading engineering rock and agent on crack resistance of concrete are cut off test.
Claims (3)
1. a simple and easy rock and concrete cement plane shearing test method; Shear Strength for detection of two media cement plane; it is characterized in that; the cementing test specimen of detected rock-concrete is vertically arranged; by power transmission screw rod, at two media cement plane place, impose horizontal shear force, by the maximum strain that is placed in the strain transducer collection shear history sensor of power transmission screw rod; In the same horizontal line, sensor base has the cambered surface with the laminating of power transmission screw rod for described power transmission screw rod and sensor axis.
2. simple and easy rock and a concrete cement plane shearing test device of realizing claim 1 method, comprise base clamp, power transmission screw mechanism, sensor mechanism; Described base clamp is by device pedestal (1) and be arranged on test specimen on device pedestal clamping hole slot (9) and form; Power transmission screw rod (3) is fixed on power transmission screw rod (3) by web joint (2); By four form-strain rosettes of foil gauge R1, R2, R3, R4 (10), be disposed radially on power transmission screw rod (3); The geometric center of strain rosette (10) and power transmission screw rod (3) dead in line.
3. simple and easy rock according to claim 2 and concrete cement plane shearing test device, is characterized in that: described foil gauge is the circular arc being easy to the laminating of power transmission screw rod (3) appearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310632690.8A CN103674833A (en) | 2013-11-29 | 2013-11-29 | Simple shearing test method and device for rock-concrete cement face |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310632690.8A CN103674833A (en) | 2013-11-29 | 2013-11-29 | Simple shearing test method and device for rock-concrete cement face |
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| CN103674833A true CN103674833A (en) | 2014-03-26 |
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| CN201310632690.8A Pending CN103674833A (en) | 2013-11-29 | 2013-11-29 | Simple shearing test method and device for rock-concrete cement face |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370589A (en) * | 2016-08-29 | 2017-02-01 | 西南交通大学 | Device and method for testing shear strength of cementation face between early-age sprayed concrete and rock |
| CN108426830A (en) * | 2018-03-19 | 2018-08-21 | 中冶建筑研究总院有限公司 | The method for measuring the adhesive property of the new and old material interface of the concrete structure after repairing |
| CN111678808A (en) * | 2020-05-15 | 2020-09-18 | 江苏禹治流域管理技术研究院有限公司 | Device and method for testing dynamic shear resistance of rock and concrete bonding surface |
| CN114839049A (en) * | 2022-04-06 | 2022-08-02 | 珠江水利委员会珠江水利科学研究院 | Concrete and rock cement face shear failure process visualization device in-situ direct shear test |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370589A (en) * | 2016-08-29 | 2017-02-01 | 西南交通大学 | Device and method for testing shear strength of cementation face between early-age sprayed concrete and rock |
| CN106370589B (en) * | 2016-08-29 | 2018-10-30 | 西南交通大学 | The device and test method of test early age spray concrete and rock cement plane shear strength |
| CN108426830A (en) * | 2018-03-19 | 2018-08-21 | 中冶建筑研究总院有限公司 | The method for measuring the adhesive property of the new and old material interface of the concrete structure after repairing |
| CN111678808A (en) * | 2020-05-15 | 2020-09-18 | 江苏禹治流域管理技术研究院有限公司 | Device and method for testing dynamic shear resistance of rock and concrete bonding surface |
| CN114839049A (en) * | 2022-04-06 | 2022-08-02 | 珠江水利委员会珠江水利科学研究院 | Concrete and rock cement face shear failure process visualization device in-situ direct shear test |
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Application publication date: 20140326 |