AU2014339682B2 - Apparatus and method for monitoring mining fiber grating roof separation layer - Google Patents
Apparatus and method for monitoring mining fiber grating roof separation layer Download PDFInfo
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- AU2014339682B2 AU2014339682B2 AU2014339682A AU2014339682A AU2014339682B2 AU 2014339682 B2 AU2014339682 B2 AU 2014339682B2 AU 2014339682 A AU2014339682 A AU 2014339682A AU 2014339682 A AU2014339682 A AU 2014339682A AU 2014339682 B2 AU2014339682 B2 AU 2014339682B2
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- 239000000835 fiber Substances 0.000 title claims abstract description 102
- 238000000926 separation method Methods 0.000 title claims abstract description 74
- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 238000005065 mining Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- 238000005259 measurement Methods 0.000 claims abstract description 22
- 238000004806 packaging method and process Methods 0.000 claims abstract description 22
- 210000000078 claw Anatomy 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 206010017076 Fracture Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C39/00—Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
An apparatus for monitoring a mining fiber grating roof separation layer comprises a perpendicular measurement barrel (1) disposed in roof drill hole and a packaging housing (19) connected under the perpendicular measurement barrel (1). Fixed-pulley fixed-frames (6) and steel tape pulley fixed-frames (7) are symmetrically disposed on the upper portion of the packaging housing (19), and constant-strength cantilever beams (15) are symmetrically disposed on the lower portion. Tension springs (16) are disposed on opposite ends of the constant-strength cantilever beams (15). The other ends of the two tension springs (16) are connected to a steel wire rope (3). The steel wire rope (3) passes through steel tape pulleys (17) and fixed pulleys (18), and penetrates out from a steel wire rope led-out hole (2) on the top of the perpendicular measurement barrel (1). The end head of the steel wire rope (3) is connected to an anchorage head (5). Fiber gratings A (8) and fiber grating B (9) are symmetrically disposed at left sides and right sides of the constant-strength cantilever beams (15). The fiber gratings A (8) and the fiber gratings B (9) penetrate out from a fiber led-out hole (10) through a same fiber (12) and are connected to a fiber connector (14). Also disclosed is a method for monitoring a mining fiber grating roof separation layer by using the apparatus for monitoring a mining fiber grating roof separation layer.
Description
Field of the Invention
The present invention relates to a monitoring apparatus and a monitoring method, in particular to mining fiber grating-based apparatus and method for monitoring roof separation layer, which are applicable to measurement and early warning of roof collapse in a coal mine roadway and at a mining face.
.0 Background of the Invention
In recent years, as coal mining techniques were improved continuously, the mining industry in China has developed more rapidly in a better way. However, as the coal mining depth increases, the underground pressure appearance in coal mines becomes more and more prominent, and the resultant disasters become more and more severe. .5 Roof separation layer is one of the major forms of deformation and damage of the surrounding rock at roadways, and, for a roadway shored by anchor rods, roof separation layer is the most severe potential safety hazard. Hence, it is required to monitor the data of separation and displacement of the roadway roof continuously, in order to learn about the reasonableness of shoring parameter settings of the anchor rods, the stability of the Ό roof, and the development of fractures in the overlaying rock of roadway roof, etc.. Serious roof accidents, such as roof collapse, may occur once the roof separation layer goes beyond a specific range, when appropriate shoring measures are not taken timely.
At present, most roof separation layer monitoring apparatuses commonly used in the underground environments in the coal mines in China are mechanical roadway roof separation layer indicating instruments or roadway roof separation layer indicating instruments that utilize electrical elements/components to give off audible and visual alarms. Though those measures have positive effects in prevention of roof collapse, they still have the following drawbacks: all of them rely on periodical manual observation and measurement of roof separation layer, they involve inconvenient underground data reading, high human-caused reading error, and low accuracy, and cannot carry out automatic and continuous monitoring and data transmission for roof separation layer, cannot give warning against the roof separation layer data automatically, and have a strong impact on the safety and reliability of roadway and mining work. Hence, it is of great significance to realize automatic monitoring of roof instability and separation, in order to carry out real-time on-line monitoring and warning for roof separation layer of roadway shored by anchor rods timely, scientifically, and accurately, so that effective measures can be taken timely to avoid outburst damages.
2014339682 11 Apr 2016
Contents of the Invention
Technical scheme: The apparatus for monitoring mining fiber grating roof separation layer provided in the present invention comprises: a perpendicular measurement barrel disposed in a roof drill hole; a packaging housing connected under the perpendicular 5 measurement barrel; a fixed-pulley fixing frame and a steel tape pulley fixing frame disposed symmetrically on the upper part of the packaging housing; constant-strength cantilever beams disposed symmetrically on the lower part of the packaging housing; fiber led-out holes arranged symmetrically on the left side and the right side of the packaging housing; fixed pulleys disposed on the fixed-pulley fixing frame; steel tape .0 pulleys disposed on the steel tape pulley fixing frame; tension springs disposed respectively on opposite ends of the constant-strength cantilever beams disposed symmetrically, with the other end of each of the two tension springs connected to a steel wire rope, which passes through the steel tape pulleys and the fixed pulleys, and are led out from a steel wire rope led-out hole on the top of the perpendicular measurement .5 barrel, with the end of the steel wire rope led out from the steel wire rope led-out hole connected to an anchorage head having at least two anchorage claws; and, an fiber grating A and an fiber grating B disposed symmetrically on the left side and the right side of the constant-strength cantilever beams, led out via a same fiber from the fiber led-out hole and connected to an fiber connector, the fiber led-out hole is filled with a sealant Ό used for sealing the fiber led-out hole, and the fiber led out from the fiber led-out hole is armored with a rubber sheath.
The perpendicular measurement barrel may be in 30-35mm diameter and 250-350mm length.
The anchorage head may be arranged with 2-4 anchorage claws.
The fiber grating A and the fiber grating B may have the same shape and size but have different wavelengths.
The maximum length of the steel wire rope may be 7m.
The fixed pulley may be a plastic bearing pulley with a U-shaped groove.
In another aspect the present invention provides a method for monitoring mining fiber 30 grating roof separation layer with the apparatus described above:
a. in a roadway shored by anchor rods, drilling towards the vicinity of the anchor rods that shore the roof of the roadway to predetermined depth;
b. arranging a shallow measuring point and a deep measuring point within the hole, wherein, the shallow measuring point is arranged at the same level as the upper end of the roof supporting anchor rods, while the deep measuring point is arranged in a stable rock formation at the upper end of the hole;
c. using a mounting rod, pushing an anchorage head to the deep measuring point at the upper end of the hole, and pushing another anchorage head to the shallow measuring point, so that the steel wire rope coiled on the steel tape pulley is uncoiled; pulling the packaging housing gently, to ensure the anchorage claws on the anchorage head have anchored to the rock formation;
2014339682 11 Apr 2016
Ϊ5
d. connecting the fiber connector of the fiber outside of the packaging housing to an fiber junction box;
e. indicating the stress change of the steel wire rope through the wavelength values of the fiber grating A and fiber grating B, demodulating wavelength values into a digital signal using a wavelength demodulator, transmitting to a computer so that the amount of roof separation layer is displayed visually in real time, plotting a separation layer amount change curve according to the amount of separation, judging whether there is obvious separation layer against a preset separation layer threshold, to monitor the data variation of roof separation layer in real time:
(1) it can be judged that there is no separation layer in the roof or the position of roof separation layer is above the deep measuring point, when the data at the deep measuring point has no change, the data at the shallow measuring point has no change, and the data difference between the deep measuring point and the shallow measuring point has no change; in that case, increasing the depth of the deep measuring point to monitor whether there is any change of data at the deep measuring point or at the shallow measuring point, and further judging the status of roof separation layer;
(2) it can be judged that the position of roof separation layer is between the deep measuring point and the shallow measuring point, when the data at the deep measuring point increases gradually, the data at the shallow measuring point has no change, and the data difference between the deep measuring point and the shallow measuring point increases gradually;
(3) it can be judged that the position of roof separation layer is below the shallow measuring point, when the data at the deep measuring point increases gradually, the data at the shallow measuring point increases gradually, and the amount of increase at the deep measuring point is the same as that at the shallow measuring point.
Beneficial effects: Embodiments of the present invention utilizes differential temperature compensation, achieves online measurement of roof separation layer, and can avoid the occurrence of roof collapse accidents. Hence, the present invention is of great significance for safe construction and stability of roadways shored by anchor rods. Compared with the prior art, the present invention attains a good monitoring effect and high measuring accuracy, can give warning and alarm timely against the separation layer data, has high reliability, and supports automatic real-time on-line and continuous monitoring. Embodiments of the present invention mainly have the following advantages:
1. Since steel tape trolleys are used and the steel wire rope is wound on the steel tape trolleys, the amount of separation can be measured accurately no matter how great the separation displacement is, as long as the length of the steel wire rope is enough.
2. Since the fiber gratings employed have very high sensitive sensing property, even trivial change of separation displacement can be measured, and an alarm or warning signal can be given off accurately and conveniently;
2014339682 11 Apr 2016
3. The fiber gratings can achieve directly data acquisition in the underground scene, and the method is convenient and flexible, and has high anti-electromagnetic interference capability; simultaneously, fibers can be used for signal transmission to achieve long transmission distance, high reliability, and wide measuring range;
4. The present invention realizes online measurement of roof separation layer, and the amount of roof separation layer converts the displacement of separation layer into the variation of deflection at the free end of the constant-strength cantilever beam by means of the steel wire rope and the tension spring, so that the central wavelength of the fiber grating attached to the right side and the left side of the constant-strength cantilever .0 beam changes; thus, the amount of roof separation layer can be calculated by measuring the wavelength variation of the fiber gratings;
5. The fiber gratings attached to the right side and left side of the constant-strength cantilever beam utilizes differential temperature compensation to achieve temperature compensation, to solve the effect of cross sensitivity between stain and temperature, to .5 eliminate the effect of temperature on the strain of the fiber gratings and to improve the measuring accuracy.
Description of the Drawings
Fig. 1 is a front view of the structure of the apparatus according to the present invention;
!0 Fig. 2 is a right view of the structure of the apparatus according to the present invention;
Fig. 3 is a top view of the structure of the apparatus according to the present invention;
Fig. 4 is schematic diagram of the attachment position of the fiber gratings on the constant-strength cantilever beams according to the present invention;
Fig. 5 is a right view of the structure shown in Fig. 4;
:5 Fig. 6 is a layout diagram of the apparatus according to the present invention;
Fig. 7 is a schematic diagram of separation monitoring with the apparatus according to the present invention.
Among the figures: 1 - perpendicular measurement barrel; 2 - steel wire rope led-out hole; 3 - steel wire rope; 4 - anchorage claw; 5 - anchorage head; 6 - fixed-pulley fixing frame; 7 - steel tape pulley fixing frame; 8 - fiber grating A; 9 - fiber grating B; 10 - fiber led-out hole; 11 - sealant; 12 - fiber; 13 - armor rubber sheath; 14 - fiber connector; 15 constant-strength cantilever beam; 16 - tension spring; 17 - steel tape pulley; 18 - fixed pulley; 19 - packaging housing; 20 - roadway; 21 - anchor rod; 22 - drill hole; 23 - fiber junction box; 24 - shallow measuring point; 25 - deep measuring point.
Detailed Description of the Embodiments
Hereunder the present invention will be detailed in embodiments with reference to the accompanying drawings:
2014339682 11 Apr 2016
As shown in the figures, apparatus for monitoring mining fiber grating roof separation layer provided in the present invention comprises: a perpendicular measurement barrel 1 in 30-35mm diameter and 250-350mm length, disposed in roof drill hole; a packaging 5 housing 19 connected under the perpendicular measurement barrel 1; a fixed-pulley fixing frame 6 and a steel tape pulley fixing frame 7 disposed symmetrically on the upper part of the packaging housing 19; constant-strength cantilever beams 15 disposed symmetrically on the lower part of the packaging housing 19; fiber led-out holes 10 arranged symmetrically on the left side and right side of the packaging housing 19; fixed .0 pulleys 18 disposed on the fixed-pulley fixing frame 6; steel tape pulleys 17 disposed on the steel tape pulley fixing frame 7; tension springs 16 disposed respectively on opposite ends of the constant-strength cantilever beams 15 disposed symmetrically, with the other end of each of the two tension springs 16 connected to a steel wire rope 3, which passes through the steel tape pulleys 17 and the fixed pulleys 18, and are led out from a steel .5 wire rope led-out hole 2 on the top of the perpendicular measurement barrel 1, with the end of the steel wire rope (3) led out from the steel wire rope led-out hole (2) connected to an anchorage head 5 having at least two anchorage claws 4; an fiber grating A 8 and an fiber grating B 9, disposed symmetrically on the left part and the right part of the constant-strength cantilever beams 15, having the same shape and size but different !0 wavelengths, aligned to each other, led out via a same fiber 12 from the fiber led-out hole 10 and connected to an fiber connector 14, and a sealant 11 filled in the fiber led-out hole 10 for sealing the fiber led-out hole 10, and the fiber 12 led out from the fiber led-out hole 10 is armored with a rubber sheath 13.
A method for monitoring mining fiber grating roof separation layer with the apparatus described above:
a. in a roadway shored by anchor rods, drilling towards the vicinity of the anchor rods that shore the roof of the roadway to predetermined depth;
b. arranging a shallow measuring point 24 and a deep measuring point 25 within the hole, wherein, the shallow measuring point 24 is arranged at the same level as the upper end of the roof anchor rods 21, while the deep measuring point 25 is arranged in a stable rock formation at the upper end of the hole 22;
c. using a mounting rod, pushing an anchorage head to the deep measuring point 25 at the upper end of the hole, and pushing another anchorage head to the shallow measuring point 24, so that the steel wire rope coiled on the steel tape pulley is uncoiled; pulling the packaging housing 19 gently, to ensure the anchorage claws 4 on the anchorage head 5 have anchored to the rock formation;
d. connecting the fiber connector 14 of the fiber 12 outside of the packaging housing 19 to an fiber junction box 23;
e. indicating the stress change of the steel wire rope 3 through the wavelength values of the fiber grating A 8 and fiber grating B 9, demodulating wavelength values into a digital signal using a wavelength demodulator, transmitting to a computer so that the
2014339682 11 Apr 2016 .5 amount of roof separation layer is displayed visually in real time, plotting a separation layer amount change curve according to the amount of separation, judging whether there is obvious separation layer against a preset separation layer threshold, to monitor the data variation of roof separation layer in real time:
(1) it can be judged that there is no separation in the roof or the position of layer is above the deep measuring point 25, when the data at the deep measuring point 25 has no change, the data at the shallow measuring point 24 has no change, and the data difference between the deep measuring point 25 and the shallow measuring point 24 has no change; in that case, increasing the depth of the deep measuring point 25 to monitor whether there is any change of data at the deep measuring point 25 or at the shallow measuring point 24, and further judging the status of roof separation layer;
(2) it can be judged that the position of roof separation layer is between the deep measuring point 25 and the shallow measuring point 24, when the data at the deep measuring point 25 increases gradually, the data at the shallow measuring point 24 has no change, and the data difference between the deep measuring point 25 and the shallow measuring point 24 increases gradually;
(3) it can be judged that the position of roof separation layer is below the shallow measuring point 24, when the data at the deep measuring point 25 increases gradually, the data at the shallow measuring point 24 increases gradually, and the amount of increase at the deep measuring point 25 is the same as that at the shallow measuring point 24.
Working principle: When separation layer is occurred in the roof, the anchorage head !5 moves along with the roof rock, the steel wire rope coiled on the steel tape pulleys is pulled out, so that the steel wire rope connected to the anchorage head is tensioned up and thereby pulls the tension spring; thus, the tension spring is in tension state, and further pulls and bends the free end of the constant-strength cantilever beam; consequently, causing strain in the fiber gratings attached to the constant-strength cantilever beams;
hence, the central wavelengths of the fiber gratings shift. The wavelength signal is demodulated into a digital signal by a fiber demodulator, and the digital signal is transmitted to a computer; thus, the amount of roof separation layer can be displayed dynamically in real time. The fiber gratings employed in the present invention have very high sensitivity, and differential temperature compensation is used to eliminate the effect of temperature on the fiber gratings; thus, the displacement of separation can be measured accurately. The present invention realizes online measurement of roof separation layer and direct data acquisition in the underground scene, and the method is convenient and flexible, and has high anti-electromagnetic interference capability; simultaneously, the present invention utilizes fibers for signal transmission to achieve long transmission distance, high reliability, and wide measuring range; in addition, the present invention can give alarm and warning signals accurately and conveniently, so that the symptom of roof instability can be found timely, to avoid the occurrence of roof collapse accidents. The monitoring data can be used as a basis for modifying and improving the initial design
2014339682 11 Apr 2016 of anchor rod shoring. Thus, the present invention is of great significance for safe construction and stability of roadways shored by anchor rods.
The present invention employs differential temperature compensation method to solve cross sensitivity of strain and temperature incurred by temperature variation during strain measurement with fiber gratings. The fiber gratings arranged at the left side and the right side of the constant-strength cantilever beam are in the same shape and size, have different central wavelengths, aligned to each other, and are in the same working environment. Therefore, temperature variation results in synchronous shifts and changes .0 of central wavelength in the two fiber gratings, while the central wavelength changes in the two fiber gratings resulted by the stress are of the same magnitude but are in directions reverse to each other. Suppose the central wavelength of the fiber grating A on the left side of the constant-strength cantilever beam is Xa and the central wavelength of the fiber grating B on the right side of the constant-strength cantilever beam is λβ, both of .5 them are subject to the effect of temperature and stress, i.e., kA=kstress+ktemPerature, kiiGeiiiperaiure-ksiress; by means of a subtraction operation between the central wavelength Xa and the central wavelength λβ of the two fiber gratings, i.e., λΑ-λΐ!=2λ3ι,-ε^. so that the effect of temperature on the fiber gratings are eliminated, the problem of cross sensitivity between strain and temperature is solved and the accuracy and sensitivity of measurement
Ό is improved.
Claims (3)
- Claims2014339682 11 Apr 20161. An apparatus for monitoring mining fiber grating roof separation layer, comprising a packaging housing, a fiber, fiber gratings, tension springs, a steel wire rope and an anchorage head, wherein, further comprising: a perpendicular measurement barrel disposed in a roof drill hole; a packaging housing connected under the perpendicular measurement barrel; a fixed-pulley fixing frame and a steel tape pulley fixing frame disposed symmetrically on the upper part of the packaging housing; constant-strength cantilever beams disposed symmetrically on the lower part of the packaging housing; fiber led-out holes arranged symmetrically on the left side and the right side of the packaging housing; fixed pulleys disposed on the fixed-pulley fixing frame; steel tape pulleys disposed on the steel tape pulley fixing frame; tension springs disposed respectively on opposite ends of the constant-strength cantilever beams disposed symmetrically, with the other end of each of the two tension springs connected to a steel wire rope, which passes through the steel tape pulleys and the fixed pulleys, and are led out from a steel wire rope lead-out hole on the top of the perpendicular measurement barrel, with the end of the steel wire rope led out from the steel wire rope led-out hole connected to an anchorage head having at least two anchorage claws; an fiber grating A and an fiber grating B disposed symmetrically on the left side and the right side of the constant-strength cantilever beams, led out via a same fiber from the fiber led-out hole and connected to an fiber connector , a sealant filled in the fiber led-out hole used for sealing the fiber led-out hole, and the fiber led out from the fiber led-out hole is armored with a rubber sheath.2. The apparatus for monitoring mining fiber grating roof separation layer according to claim 1, wherein, the perpendicular measurement barrel is in 30-35mm diameter and 250-350mm length.3. The apparatus for monitoring mining fiber grating roof separation layer according to claim 1, wherein, the anchorage head is arranged with 2-4 anchorage claws.4. The apparatus for monitoring mining fiber grating roof separation layer according to claim 1, wherein, the fiber grating A and the fiber grating B have the same shape and size but have different wavelengths.5. The apparatus for monitoring mining fiber grating roof separation layer according to claim 1, wherein, the maximum length of the steel wire rope is 7m.6. The apparatus for monitoring mining fiber grating roof separation layer according to claim 1, wherein, the fixed pulley is a plastic bearing pulley with a U-shaped groove.7. A method for monitoring mining fiber grating roof separation layer with the apparatus according to the claim 1, comprising, in a roadway shored by anchor rods, drilling towards the vicinity of the anchor rods that shore the roof of the roadway to predetermined depth, wherein,a. arranging a shallow measuring point and a deep measuring point within the hole, wherein, the shallow measuring point is arranged at the same level as the upper end of the roof supporting anchor rods, while the deep measuring point is arranged in a stable rock formation at the upper end of the hole;2014339682 11 Apr 2016b. using a mounting rod, pushing an anchorage head to the deep measuring point at the upper end of the hole, and pushing another anchorage head to the shallow measuring point, so that the steel wire rope coiled on the steel tape pulley is uncoiled; pulling the packaging housing gently, to ensure the anchorage claws on the anchorage head have anchored to the rock formation;c. connecting the fiber connector of the fiber outside of the packaging housing to an fiber junction box;d. indicating the stress change of the steel wire rope through the wavelength values of the fiber grating A and fiber grating B, demodulating wavelength values into a digital signal, using a wavelength demodulator, transmitting to a computer, so that the amount of roof separation layer is displayed visually in real time, plotting a separation layer amount change curve according to the amount of separation layer, judging whether there is obvious separation layer against a preset separation layer threshold to monitor the data variation of roof separation layer in real time:(1) it can be judged that there is no separation layer in the roof or the position of roof separation layer is above the deep measuring point, when the data at the deep measuring point has no change, the data at the shallow measuring point has no change, and the data difference between the deep measuring point and the shallow measuring point has no change; in that case, increasing the depth of the deep measuring point to monitor whether there is any change of data at the deep measuring point or at the shallow measuring point, and further judging the status of roof separation layer;
- (2) it can be judged that the position of roof separation layer is between the deep measuring point and the shallow measuring point, when the data at the deep measuring point increases gradually, the data at the shallow measuring point has no change, and the data difference between the deep measuring point and the shallow measuring point increases gradually;
- (3) it can be judged that the position of roof separation layer is below the shallow measuring point, when the data at the deep measuring point increases gradually, the data at the shallow measuring point increases gradually, and the amount of increase at the deep measuring point is the same as that at the shallow measuring point.WO 2015/058488PCT/CN2014/074083Accompanying DrawingsFig. 1Fig. 21/3WO 2015/058488PCT/CN2014/074083V.Fig. 3Fig. 4Fig. 5Fig. 62/3WO 2015/058488PCT/CN2014/0740832SFig. 73/3
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310511355.2A CN103528530B (en) | 2013-10-25 | 2013-10-25 | A kind of mining optical fiber grating roof abscission layer monitoring device and monitoring method |
| CN201310511355.2 | 2013-10-25 | ||
| PCT/CN2014/074083 WO2015058488A1 (en) | 2013-10-25 | 2014-03-26 | Apparatus and method for monitoring mining fiber grating roof separation layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2014339682A1 AU2014339682A1 (en) | 2016-04-28 |
| AU2014339682B2 true AU2014339682B2 (en) | 2018-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2014339682A Active AU2014339682B2 (en) | 2013-10-25 | 2014-03-26 | Apparatus and method for monitoring mining fiber grating roof separation layer |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN103528530B (en) |
| AU (1) | AU2014339682B2 (en) |
| RU (1) | RU2627051C1 (en) |
| WO (1) | WO2015058488A1 (en) |
| ZA (1) | ZA201601972B (en) |
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| CN103528530B (en) * | 2013-10-25 | 2015-10-14 | 中国矿业大学 | A kind of mining optical fiber grating roof abscission layer monitoring device and monitoring method |
| CN103743357A (en) * | 2014-01-24 | 2014-04-23 | 西安科技大学 | Fiber bragg grating separation layer device for monitoring deformation of rock roof |
| CN103759659B (en) * | 2014-01-27 | 2016-04-13 | 山东微感光电子有限公司 | A kind of fiber grating displacement sensor carrying out multimetering |
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- 2014-03-26 WO PCT/CN2014/074083 patent/WO2015058488A1/en active Application Filing
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| DE19913113A1 (en) * | 1999-03-23 | 2000-10-12 | Geso Ges Fuer Sensorik Geotech | Deformation measuring device for anchor bars in mining has fibre grating sensors with fibre windings having twist angles based on compensation conditions for simultaneous linear extension and transversal contraction |
| CN103226006A (en) * | 2013-03-19 | 2013-07-31 | 西安科技大学 | Fiber grating displacement meter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015058488A1 (en) | 2015-04-30 |
| CN103528530B (en) | 2015-10-14 |
| ZA201601972B (en) | 2017-09-27 |
| RU2627051C1 (en) | 2017-08-03 |
| AU2014339682A1 (en) | 2016-04-28 |
| CN103528530A (en) | 2014-01-22 |
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