CN210981177U - Intelligent geogrid suitable for tunnel and monitoring system thereof - Google Patents
Intelligent geogrid suitable for tunnel and monitoring system thereof Download PDFInfo
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- CN210981177U CN210981177U CN201922456038.0U CN201922456038U CN210981177U CN 210981177 U CN210981177 U CN 210981177U CN 201922456038 U CN201922456038 U CN 201922456038U CN 210981177 U CN210981177 U CN 210981177U
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Abstract
The utility model belongs to the technical field of tunnel engineering safety monitoring and protection, and discloses an intelligent geogrid suitable for a tunnel and a monitoring system thereof, wherein the intelligent geogrid comprises a first geogrid, a second geogrid and a mixed optical fiber, the mixed optical fiber is pasted on the outer surface of the first geogrid, the second geogrid is connected with the first geogrid to form a geogrid body, the mixed optical fiber is positioned inside the geogrid body, the mixed optical fiber comprises strain optical fibers and temperature optical fibers, four corners of the geogrid body are respectively provided with grouting holes, and the geogrid body is paved in tunnel surrounding rocks; the monitoring system of the intelligent geogrid comprises a transmission optical cable, a demodulator and the intelligent geogrid, wherein the transmission optical cable is respectively connected with the hybrid optical fiber and the demodulator. The utility model provides a be applicable to the geogrid later stage secondary reinforcement difficulty in tunnel among the prior art, the problem that the deformation position of tunnel country rock is difficult to pinpoint.
Description
Technical Field
The utility model relates to a tunnel engineering safety monitoring and protection technical field especially relate to an intelligent geogrid and monitoring system suitable for tunnel.
Background
In the field of safety monitoring and protection of tunnel engineering, in order to ensure normal construction during the construction period and normal use during the operation period of a tunnel, a tunnel structure, particularly an aquifer and a crushed zone, must be supported and monitored to determine the health condition of the tunnel. The existing supporting technology mainly adopts an anchor rod matched with cement mortar and a lining for supporting, the monitoring technology mainly relies on a traditional monitoring method, a total station, a level gauge, an electric sensor and the like are used for monitoring a tunnel, and the traditional supporting and monitoring method cannot effectively support and monitor in real time.
The existing tunnel reinforcing method is characterized in that a grouting method is generally adopted particularly for a local broken zone with high water content, and geogrid is used for assisting reinforcement, so that the tunnel can be reinforced in a short period, but in the subsequent construction process and operation process, if secondary damage occurs, the difficulty in maintenance and reinforcement is high, and the cost is high. In addition, the existing geogrid can not accurately position the deformation position of the tunnel surrounding rock, and health monitoring and repairing in the later-stage operation process of the geogrid are not facilitated.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an intelligent geogrid suitable for a tunnel and a monitoring system thereof, and solves the problem that in the prior art, the deformation position of geogrid suitable for the tunnel in the later stage is difficult to accurately position due to difficulty in secondary reinforcement and tunnel surrounding rock.
The embodiment of the application provides an intelligent geogrid suitable for a tunnel, which comprises a first geogrid, a second geogrid and a mixed optical fiber; the mixed optical fiber is adhered to the outer surface of the first geogrid, the second geogrid is connected with the first geogrid to form a geogrid body, and the mixed optical fiber is located inside the geogrid body; the hybrid optical fiber comprises a strain optical fiber and a temperature optical fiber; grouting holes are respectively formed in four corners of the geogrid body; the geogrid body is laid in the tunnel surrounding rock.
Preferably, the geogrid body comprises a plurality of parallel warp grids and a plurality of parallel weft grids.
Preferably, the hybrid optical fiber is adhered to the outer surface of the first geogrid by epoxy resin, a PVC pipe is arranged outside the hybrid optical fiber, and the PVC pipe is located inside the geogrid body.
Preferably, the strain optical fiber and the temperature optical fiber are both engraved with grating strings.
Preferably, the strain optical fiber and the temperature optical fiber are both distributed optical fibers.
In another aspect, an embodiment of the present application provides a monitoring system for an intelligent geogrid suitable for a tunnel, including: the system comprises a transmission optical cable, a demodulator and the intelligent geogrid suitable for the tunnel; one end of the transmission optical cable is connected with the hybrid optical fiber, and the other end of the transmission optical cable is connected with the demodulator.
Preferably, the monitoring system for the intelligent geogrid suitable for the tunnel further comprises: a demodulator upper computer; and the upper computer of the demodulation instrument is communicated with the demodulation instrument.
Preferably, the demodulator adopts a wireless fiber grating demodulator, a demodulation channel of the demodulator is multi-channel, and the demodulation rate of the demodulator is greater than 4 kHz.
Preferably, the monitoring system for the intelligent geogrid suitable for the tunnel further comprises: the wireless AP and the data transmission module;
the demodulator upper computer is arranged in a control room outside the tunnel, the data transmission module is arranged outside the tunnel or at the tunnel opening, and the wireless AP is arranged in the tunnel; the upper computer of the demodulation instrument is connected with the demodulation instrument sequentially through the data transmission module and the wireless AP.
Preferably, the data transmission module includes: wireless base station, gigabit fiber, and technical Ethernet ring.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
in this application embodiment, four edges of geogrid body are provided with the slip casting hole respectively, and the intensity that slip casting hole cooperation slip casting pipe is used for consolidating the country rock improves geogrid self intensity, can realize the secondary reinforcement to the country rock through reserving the slip casting hole. Hybrid optic fibre sets up in the inside of geogrid body, and hybrid optic fibre is including meeting an emergency optic fibre, temperature optic fibre, and the monitoring of meeting an emergency to the country rock can be realized to the optic fibre that meets an emergency, and temperature optic fibre can realize the monitoring to the country rock infiltration water.
Drawings
In order to more clearly illustrate the technical solution of the present embodiment, the drawings needed to be used in the description of the embodiment will be briefly introduced below, and it is obvious that the drawings in the following description are an embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an intelligent geogrid suitable for a tunnel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of curvature calculation in an intelligent geogrid suitable for a tunnel according to an embodiment of the present invention;
fig. 3 is a schematic view of a monitoring system suitable for an intelligent geogrid in a tunnel according to an embodiment of the present invention.
The device comprises a geogrid body 1, a strain optical fiber 2, a temperature optical fiber 3, a grouting hole 4, a grating string 5, a transmission optical cable 6, a demodulator 7, an upper computer of the demodulator 8, a wireless AP9 and a data transmission module 10.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1:
embodiment 1 provides an intelligent geogrid suitable for a tunnel, as shown in fig. 1, including: a first geogrid, a second geogrid, and a hybrid fiber; the mixed optical fiber is adhered to the outer surface of the first geogrid, and the second geogrid is connected with the first geogrid to form a geogrid body 1; the hybrid optical fiber is located inside the geogrid body 1. Namely, the mixed optical fiber is fixed on one surface of the geogrid, and then the geogrid with the optical fiber and the geogrid without the optical grating are combined into a whole by utilizing the geogrid processing technology.
The hybrid fiber comprises a strain fiber 2 and a temperature fiber 3. Grating strings 5 are engraved on the strain optical fiber 2 and the temperature optical fiber 3, and the two grating strings 5 are located at the same position (one of the grating strings is shown in fig. 1). The strain optical fiber 2 and the temperature optical fiber 3 are both distributed optical fibers. Strain optic fibre 2 can realize the monitoring to the country rock strayed, temperature optic fibre 3 grating cluster 5 can realize the monitoring to the country rock infiltration water, be carved with on strain optic fibre 2 grating cluster 5 can realize the camber monitoring to the concrete position of country rock. The grating string 5 is formed by connecting gratings with different wavelengths in series and is manufactured after different calibrations.
Grouting holes 4 are respectively formed in four corners of the geogrid body 1; grouting hole 4 cooperation slip casting pipe is used for consolidating the intensity of country rock and improves geogrid self intensity, through reserving grouting hole 4 can realize the secondary reinforcement to the country rock. The geogrid body 1 is laid in the tunnel surrounding rock.
The geogrid body 1 comprises a plurality of parallel warp grids and a plurality of parallel weft grids.
Specifically, the hybrid optical fiber is adhered to the outer surface of the first geogrid by epoxy resin, a PVC pipe is arranged outside the hybrid optical fiber, and the PVC pipe is located inside the geogrid body 1. The PVC pipe is used to protect the hybrid optical fiber.
By combining the temperature optical fiber 3 with the strain optical fiber 2, the influence of temperature on the strain optical fiber 2 can be reduced, and the accuracy of a measuring result is guaranteed.
Specifically, the calculation method for calculating the strain value of the geogrid by using the strain optical fiber and the temperature optical fiber comprises the following steps:
the strain value measured by the strain optical fiber isSiThe strain induced at the same position corresponding to the temperature alone isTiDirectly measured by strain fiberSiSubtracting the measured value of the corresponding position temperature optical fiberTiI.e. the strain value of the pointi：
The measured value of the temperature optical fiberTiIs mainly caused by the penetration of water, the values measurable with said temperature fiberTiThe change of the permeated water is characterized.
The grating string engraved on the strain optical fiber can realize curvature monitoring of specific point positions of the surrounding rock, curvature information of the point is obtained through wavelength change, and the calculation principle is as follows.
As shown in fig. 2, taking the length of a infinitesimal as s, the thickness as h, the distance between the grating string and the neutral line of the warp grating and the weft grating as h/2, when the section is bent under the action of external force, the arc length corresponding to the neutral line is s, the curvature radius is r, and the arc length corresponding to the upper surface of the infinitesimal is s + Δ s, according to the knowledge of material mechanics, the method can obtain:
the curvature k corresponding to the infinitesimal is obtained by simplification:
wherein, the strain of the upper surface of the micro element caused by bending is shown, and the strain is measured according to the fiber bragg grating:
Δλ＝λ(1-Pe)·＝Ke· (4)
the corresponding relation between the variation delta lambda of the central wavelength of the fiber grating stuck on the surface of the infinitesimal element and the curvature k of the micro section can be obtained:
it can be seen that the curvature and the variation of the central wavelength of the fiber grating (i.e. the grating string) are in a linear correspondence relationship, and in actual use, the curvature information of the point can be obtained through the variation of the central wavelength.
It should be noted that the present invention does not relate to a new algorithm or method, the present invention relates to a new geogrid suitable for use in a tunnel, and the above calculation method is only illustrative of the principle and known to those skilled in the art.
Example 2:
One end of the transmission optical cable 6 is connected with the hybrid optical fiber, and the other end of the transmission optical cable 6 is connected with the demodulator 7. The demodulator upper computer 8 is arranged in a control room outside the tunnel, the data transmission module 10 is arranged outside the tunnel or at the opening of the tunnel, and the wireless AP9 is arranged in the tunnel; the demodulator upper computer 8 is connected with the demodulator 7 sequentially through the data transmission module 10 and the wireless AP 9.
That is, the utility model discloses a slip casting pipe will carry optical fiber 2 that meets an emergency with the geogrid of temperature optic fibre 3 is arranged on the tunnel wall, will lay optical fiber 2 that meets an emergency with temperature optic fibre 3 passes through optical fiber monitoring part is gone into in 6 antithetical couplets of transmission cable.
Specifically, the data transmission module 10 includes: wireless base station, gigabit fiber, and technical Ethernet ring. Transmitting over long distances in tunnels through the wireless AP9 saves a significant amount of signal transmission cost.
The demodulator 7 adopts a wireless fiber grating demodulator, a demodulation channel of the demodulator 7 is multi-channel, the demodulation rate of the demodulator 7 is greater than 4kHz, and a 2.4GHz wireless transmission module is arranged in the demodulator. The demodulator 7 is used for resolving wavelength change, and the high-speed high-precision fiber grating demodulator is high in transmission speed and measurement precision and can meet the measurement requirements on wavelength signals.
The demodulation upper computer 8 is used for processing the wavelength and calculating through a related algorithm to obtain the strain magnitude and the specific point location deformation. The algorithm is the algorithm commonly used in the prior art.
To sum up, the utility model provides an intelligence geogrid monitoring system suitable for tunnel leaves the slip casting hole of establishing on through the geogrid, realize the installation of geogrid and automatic grouting technique's combination, the distributed optical fiber who lays on the geogrid simultaneously can real-time supervision tunnel wall mechanical state and warp, and transmit monitoring data to the demodulation appearance through the transmission optical cable, the demodulation appearance decodes and reads monitoring data, data after decoding transmits to the demodulation appearance host computer through wireless AP and data transmission module, the demodulation appearance host computer real-time analysis judges monitoring data, and fix a position monitoring data, if tunnel state unstability or warp too big, then carry out the early warning. The utility model overcomes a great deal of not enough and the restriction that traditional artifical detection mode and traditional sensor exist has accuracy nature, stability, high efficiency and promptness, and the small-size light in weight, optic fibre longe-lived, and the later maintenance work load is little, reduce the monitoring cost, is suitable for extensive popularization and application.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (10)
1. An intelligent geogrid suitable for use in a tunnel, comprising: a first geogrid, a second geogrid, and a hybrid fiber; the mixed optical fiber is adhered to the outer surface of the first geogrid, the second geogrid is connected with the first geogrid to form a geogrid body, and the mixed optical fiber is located inside the geogrid body; the hybrid optical fiber comprises a strain optical fiber and a temperature optical fiber; grouting holes are respectively formed in four corners of the geogrid body; the geogrid body is laid in the tunnel surrounding rock.
2. The intelligent geogrid suitable for use in a tunnel according to claim 1, wherein the geogrid body includes a plurality of parallel warp grids and a plurality of parallel weft grids.
3. The intelligent geogrid suitable for a tunnel according to claim 1, wherein the hybrid optical fiber is adhered to the outer surface of the first geogrid through epoxy resin, a PVC pipe is arranged outside the hybrid optical fiber, and the PVC pipe is located inside the geogrid body.
4. The intelligent geogrid suitable for tunnels according to claim 1, wherein the strain optical fiber and the temperature optical fiber are both engraved with grating strings.
5. The intelligent geogrid suitable for use in a tunnel according to claim 1, wherein the strain optical fiber and the temperature optical fiber are both distributed optical fibers.
6. A monitoring system suitable for an intelligent geogrid for a tunnel, comprising: a transmission cable, a detuner, an intelligent geogrid suitable for use in tunnels according to any of claims 1-5; one end of the transmission optical cable is connected with the hybrid optical fiber, and the other end of the transmission optical cable is connected with the demodulator.
7. The monitoring system for an intelligent geogrid suitable for use in a tunnel according to claim 6, further comprising: a demodulator upper computer; and the upper computer of the demodulation instrument is communicated with the demodulation instrument.
8. The monitoring system of intelligent geogrid suitable for tunnel according to claim 6, wherein the demodulator is a wireless fiber grating demodulator, the demodulation channel of the demodulator is multi-channel, and the demodulation rate of the demodulator is greater than 4 kHz.
9. The monitoring system for an intelligent geogrid suitable for use in a tunnel according to claim 7, further comprising: the wireless AP and the data transmission module;
the demodulator upper computer is arranged in a control room outside the tunnel, the data transmission module is arranged outside the tunnel or at the tunnel opening, and the wireless AP is arranged in the tunnel; the upper computer of the demodulation instrument is connected with the demodulation instrument sequentially through the data transmission module and the wireless AP.
10. The monitoring system of an intelligent geogrid suitable for use in a tunnel according to claim 9, wherein the data transmission module comprises: wireless base station, gigabit fiber, and technical Ethernet ring.
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| CN201922456038.0U CN210981177U (en) | 2019-12-31 | 2019-12-31 | Intelligent geogrid suitable for tunnel and monitoring system thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081609A (en) * | 2020-08-12 | 2020-12-15 | 山东大庚工程材料科技有限公司 | High-strength intelligent carbon fiber geogrid |
| CN112484656A (en) * | 2020-11-16 | 2021-03-12 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Optical fiber type convergence meter and using method thereof |
| CN114353686A (en) * | 2021-09-10 | 2022-04-15 | 重庆交通大学 | Intelligent acquisition method for curvature distribution of tunnel lining and related device |
| CN114894109A (en) * | 2022-02-09 | 2022-08-12 | 重庆交通大学 | Tunnel strain information acquisition method and related device |
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2019
- 2019-12-31 CN CN201922456038.0U patent/CN210981177U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081609A (en) * | 2020-08-12 | 2020-12-15 | 山东大庚工程材料科技有限公司 | High-strength intelligent carbon fiber geogrid |
| CN112081609B (en) * | 2020-08-12 | 2022-06-14 | 山东大庚工程材料科技有限公司 | High-strength intelligent carbon fiber geogrid |
| CN112484656A (en) * | 2020-11-16 | 2021-03-12 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Optical fiber type convergence meter and using method thereof |
| CN114353686A (en) * | 2021-09-10 | 2022-04-15 | 重庆交通大学 | Intelligent acquisition method for curvature distribution of tunnel lining and related device |
| CN114353686B (en) * | 2021-09-10 | 2023-10-20 | 重庆交通大学 | Intelligent obtaining method and related device for curvature distribution of tunnel lining |
| CN114894109A (en) * | 2022-02-09 | 2022-08-12 | 重庆交通大学 | Tunnel strain information acquisition method and related device |
| CN114894109B (en) * | 2022-02-09 | 2023-10-17 | 重庆交通大学 | Tunnel strain information acquisition method and related device |
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