CN105371815A - Portable rock lateral deformation measurement device - Google Patents
Portable rock lateral deformation measurement device Download PDFInfo
- Publication number
- CN105371815A CN105371815A CN201510715703.7A CN201510715703A CN105371815A CN 105371815 A CN105371815 A CN 105371815A CN 201510715703 A CN201510715703 A CN 201510715703A CN 105371815 A CN105371815 A CN 105371815A
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- CN
- China
- Prior art keywords
- clockwork spring
- alarm watch
- fiber grating
- rock
- screw rod
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a portable rock lateral deformation measurement device, and the device comprises an alarm watch spring and an adjusting screw. A slotted hole is provided with a strain gage, and the alarm watch spring is bent in a circular shape. The adjusting screw is disposed in a screw installation hole, and a rock testing piece sleeves the inner side of the alarm watch spring. The interior of a surface concave groove is provided with a fiber bragg grating in a pasted manner through epoxy resin glue. The device tests the deformation of rock in a comparison mode through employing the strain gage and the technology of fiber bragg grating sensing. The device is reasonable in design, is simple in structure, is convenient to carry, is high in precision, is good in repeatability, is good in linearity, and is large in range.
Description
Technical field
The invention belongs to rock field of measuring technique, be specifically related to a kind of portable rock lateral deformation measuring device.
Background technology
Rock (body) is a kind of heterogeneous hard brittle material, owing to having anisotropy, and be subject to the impact of extraneous various environmental baseline, there is many uncertain factors in process of deformation and failure, and the deformation and failure mechanism of rock is also the basic problem of ROCK MECHANICS RESEARCH always.
At present, measure rock lateral deformation generally to adopt: one is directly paste foil gauge on rock sample; Two is that test specimen entangles by design support, and support pastes foil gauge.The distortion of rock is measured by the distortion of measuring support.The first shortcoming measured is: rock sample surface is very uneven, and local effect is very serious; Some rock such as coal cannot paste foil gauge; Rock deformation is close to destroying and destroying the later stage, and foil gauge lost efficacy, and destroying later stage lateral deformation cannot measure; For triaxial test, lateral deformation cannot be measured with subsides foil gauge.The shortcoming that the second is measured is: structure is comparatively large, cannot put in the test cylinder of triaxial test; Processed complex, requirement on machining accuracy is higher, otherwise the linear repeatability of sensor is poor; The rigidity of structure is very large on measurement result impact; During sample dimensions change, sensor is difficult to regulate; Range is less, cannot adapt to the measurement of rock failure mechanism of rock after-deformation.So current triaxial test does not all measure lateral deformation, bulk strain can only be provided.
Summary of the invention
The object of the present invention is to provide a kind of portable rock lateral deformation measuring device, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme: a kind of portable rock lateral deformation measuring device, comprise alarm watch clockwork spring and adjustment screw rod, described alarm watch clockwork spring offers slotted eye, described slotted eye is provided with foil gauge, described alarm watch clockwork spring curves circular, and the axis of symmetry of alarm watch clockwork spring is provided with screw rod mounting hole, the inside of described alarm watch clockwork spring is provided with rock sample, described adjustment screw rod is arranged in screw rod mounting hole, described adjustment screw flight is connected with hold-down nut, described rock sample is enclosed within the inner side of alarm watch clockwork spring, the axis of described rock sample and the hoop of rock sample all offer surperficial Baltimore groove, fiber grating is pasted with by epoxide-resin glue in described surperficial Baltimore groove.
Preferably, described foil gauge is symmetrical arranged about the center of circle of alarm watch clockwork spring is two groups.
Preferably, described adjustment screw rod is set to two groups about the axis of symmetry of alarm watch clockwork spring.
Preferably, described fiber grating is exposed fiber grating string, and described fiber grating is laid with two grating regions, and described grating region length is 3-3.5cm, the fibre core diameter of described fiber grating is 40-55 μm, and the cladding diameter 120-130 μm of fiber grating.
Technique effect of the present invention and advantage: this portable rock lateral deformation measuring device, compared with traditional rock lateral deformation measuring device, the present invention adopts foil gauge and fiber grating sensing technique two kinds of contrastive patterns to test rock deformation amount, more easy to carryly accurately can draw measurement result; The principle of its fiber grating sensing technique is: when the light wave in optical fiber is by Bragg grating, meet Bragg grating wavelength condition (λ
b=2neff Λ) light be reflected back and become reflected light, remaining light becomes transmitted light, the change of extraneous parameter will cause the drift of reflected light wavelength, and by can to obtain the variable quantity of extraneous parameter to the detection of wavelength shift, the ultimate principle of Here it is optical fibre Bragg grating sensing; The present invention have reasonable in design, result is simple, easy to carry, precision is high, reproducible, good linearity and the feature such as range is large, its precision is identical with the precision of clock gauge, and range, but considerably beyond the range of clock gauge, can reach 6mm.To different sample dimensions, be easy to regulate, as long as turn the screw rod on both sides, and do not affect calibration result.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is partial structurtes schematic diagram of the present invention;
Fig. 3 is rock sample structural representation of the present invention;
Fig. 4 is optical fiber grating structure schematic diagram of the present invention.
In figure: 1 alarm watch clockwork spring, 2 slotted eyes, 3 foil gauges, 4 screw rod mounting holes, 5 adjustment screw rod, 6 hold-down nuts, 7 rock samples, 8 surperficial Baltimore grooves, 9 fiber gratings.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides the portable rock lateral deformation measuring device of one as Figure 1-4, comprise alarm watch clockwork spring 1 and adjustment screw rod 5, described alarm watch clockwork spring 1 offers slotted eye 2, described slotted eye 2 is provided with foil gauge 3, it is two groups that described foil gauge 3 is symmetrical arranged about the center of circle of alarm watch clockwork spring 1, described alarm watch clockwork spring 1 curves circular, and the axis of symmetry of alarm watch clockwork spring 1 is provided with screw rod mounting hole 4, the inside of described alarm watch clockwork spring 1 is provided with rock sample 7, described adjustment screw rod 5 is arranged in screw rod mounting hole 4, described adjustment screw rod 5 has been threaded hold-down nut 6, described adjustment screw rod 5 is set to two groups about the axis of symmetry of alarm watch clockwork spring 1, described rock sample 7 is enclosed within the inner side of alarm watch clockwork spring 1, the axis of described rock sample 7 and the hoop of rock sample 7 all offer surperficial Baltimore groove 8, fiber grating 9 is pasted with by epoxide-resin glue in described surperficial Baltimore groove 8, described fiber grating 9 is exposed fiber grating string, described fiber grating 9 is laid with two grating regions, described grating region length is 3-3.5cm, the fibre core diameter of described fiber grating 9 is 40-55 μm, and the cladding diameter 120-130 μm of fiber grating 9.
Principle of work: when the light wave in fiber grating 9 is by Bragg grating, meet Bragg grating wavelength condition (λ
b=2neff Λ) light be reflected back and become reflected light, remaining light becomes transmitted light.The change of extraneous parameter will cause the drift of reflected light wavelength, and by can obtain the variable quantity of extraneous parameter to the detection of wavelength shift, the ultimate principle of Here it is optical fibre Bragg grating sensing.According to the fundamental equation of fiber grating 9 sensing, the drift value of fiber grating 9 centre wavelength is decided by its effective refractive index and screen periods, and the change of these two parameters of any change all will cause the drift of wavelength.Under external world's strain (or stress) effect, fiber grating 9 cycle can change, and the photoelastic effect simultaneously produced can make fiber grating 9 effective refractive index change; When fiber grating 9 is subject to extraneous thermal effect, heat expansion can make fiber grating 9 cycle change, thermal sensitive effect can cause the effective refractive index of fiber grating 9 to change simultaneously, therefore, extraneous strain (or stress) and temperature are the physical quantitys that directly significantly can change fiber grating 9 wavelength.Various fiber grating 9 sensor is all utilize strain or temperature change raster center wavelength directly or indirectly substantially, reaches the object of test measurand.
Last it is noted that the foregoing is only the preferred embodiments of the present invention; be not limited to the present invention; although with reference to previous embodiment to invention has been detailed description; for a person skilled in the art; it still can be modified to the technical scheme described in foregoing embodiments; or equivalent replacement is carried out to wherein portion of techniques feature; within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a portable rock lateral deformation measuring device, comprise alarm watch clockwork spring (1) and adjustment screw rod (5), described alarm watch clockwork spring (1) offers slotted eye (2), it is characterized in that: described slotted eye (2) is provided with foil gauge (3), described alarm watch clockwork spring (1) curves circular, and the axis of symmetry of alarm watch clockwork spring (1) is provided with screw rod mounting hole (4), the inside of described alarm watch clockwork spring (1) is provided with rock sample (7), described adjustment screw rod (5) is arranged in screw rod mounting hole (4), described adjustment screw rod (5) has been threaded hold-down nut (6), described rock sample (7) is enclosed within the inner side of alarm watch clockwork spring (1), the axis of described rock sample (7) and the hoop of rock sample (7) all offer surperficial Baltimore groove (8), fiber grating (9) is pasted with by epoxide-resin glue in described surperficial Baltimore groove (8).
2. the portable rock lateral deformation measuring device of one according to claim 1, is characterized in that: it is two groups that described foil gauge (3) is symmetrical arranged about the center of circle of alarm watch clockwork spring (1).
3. the portable rock lateral deformation measuring device of one according to claim 1, is characterized in that: described adjustment screw rod (5) is set to two groups about the axis of symmetry of alarm watch clockwork spring (1).
4. the portable rock lateral deformation measuring device of one according to claim 1, it is characterized in that: described fiber grating (9) is exposed fiber grating string, described fiber grating (9) is laid with two grating regions, described grating region length is 3-3.5cm, the fibre core diameter of described fiber grating (9) is 40-55 μm, and the cladding diameter 120-130 μm of fiber grating (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510715703.7A CN105371815A (en) | 2015-10-28 | 2015-10-28 | Portable rock lateral deformation measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510715703.7A CN105371815A (en) | 2015-10-28 | 2015-10-28 | Portable rock lateral deformation measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105371815A true CN105371815A (en) | 2016-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510715703.7A Pending CN105371815A (en) | 2015-10-28 | 2015-10-28 | Portable rock lateral deformation measurement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105371815A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500652A (en) * | 2016-11-14 | 2017-03-15 | 河海大学 | A kind of servo-actuated Multi-point contact type hoop strain measurement apparatus |
| CN106771052A (en) * | 2016-11-14 | 2017-05-31 | 河海大学 | A kind of ring and axial strain measurement apparatus for rocks sample |
| CN111486799A (en) * | 2020-04-30 | 2020-08-04 | 中山市精量光电子科技有限公司 | Fiber grating shape perception sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090514U (en) * | 1990-09-02 | 1991-12-11 | 潘一山 | Rock lateral deformation measuring device |
| WO2004113830A1 (en) * | 2003-06-17 | 2004-12-29 | National Institute Of Advanced Industrial Science And Technology | Strain and ae measurement device using optical fiber sensor |
| CN103669429A (en) * | 2013-12-12 | 2014-03-26 | 河海大学 | Round solid concrete pile body strain monitoring method based on FBG sensor |
| CN103759666A (en) * | 2014-01-13 | 2014-04-30 | 河海大学 | Device and method for monitoring pile body strain of round solid pile |
| CN103792149A (en) * | 2014-03-04 | 2014-05-14 | 大连理工大学 | Bituminous pavement material side stability sensor based on fiber bragg gratings |
| CN203705315U (en) * | 2014-02-25 | 2014-07-09 | 中国矿业大学 | Permeameter with radial displacement measuring device |
-
2015
- 2015-10-28 CN CN201510715703.7A patent/CN105371815A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090514U (en) * | 1990-09-02 | 1991-12-11 | 潘一山 | Rock lateral deformation measuring device |
| WO2004113830A1 (en) * | 2003-06-17 | 2004-12-29 | National Institute Of Advanced Industrial Science And Technology | Strain and ae measurement device using optical fiber sensor |
| CN103669429A (en) * | 2013-12-12 | 2014-03-26 | 河海大学 | Round solid concrete pile body strain monitoring method based on FBG sensor |
| CN103759666A (en) * | 2014-01-13 | 2014-04-30 | 河海大学 | Device and method for monitoring pile body strain of round solid pile |
| CN203705315U (en) * | 2014-02-25 | 2014-07-09 | 中国矿业大学 | Permeameter with radial displacement measuring device |
| CN103792149A (en) * | 2014-03-04 | 2014-05-14 | 大连理工大学 | Bituminous pavement material side stability sensor based on fiber bragg gratings |
Non-Patent Citations (1)
| Title |
|---|
| 魏世明等: "岩石变形光栅检测的表面粘贴法及应变传递分析", 《岩石工程学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500652A (en) * | 2016-11-14 | 2017-03-15 | 河海大学 | A kind of servo-actuated Multi-point contact type hoop strain measurement apparatus |
| CN106771052A (en) * | 2016-11-14 | 2017-05-31 | 河海大学 | A kind of ring and axial strain measurement apparatus for rocks sample |
| CN106771052B (en) * | 2016-11-14 | 2019-05-28 | 河海大学 | A kind of circumferential direction and axial strain measuring device for rocks sample |
| CN106500652B (en) * | 2016-11-14 | 2019-08-06 | 河海大学 | A follow-up multi-point contact hoop strain measuring device |
| CN111486799A (en) * | 2020-04-30 | 2020-08-04 | 中山市精量光电子科技有限公司 | Fiber grating shape perception sensor |
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Application publication date: 20160302 |
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