Distributed monitoring device and monitoring method of internal stress of tunnel surrounding rock, and construction method

A technology of distributed monitoring and internal stress, which is applied in the direction of measurement device, measurement of the change force of the optical properties of the material when it is stressed, and measurement of force, can solve the problem that the surrounding rock dynamic disaster is difficult to contain, and achieve a simple structure , Guarantee safety and efficiency, low cost effect

Inactive Publication Date: 2020-01-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventor discovered during the research and development process that in actual engineering, the monitoring and changing position of the internal stress of the surrounding rock in under

Method used

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  • Distributed monitoring device and monitoring method of internal stress of tunnel surrounding rock, and construction method
  • Distributed monitoring device and monitoring method of internal stress of tunnel surrounding rock, and construction method
  • Distributed monitoring device and monitoring method of internal stress of tunnel surrounding rock, and construction method

Examples

Experimental program
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Example Embodiment

[0029] Example one

[0030] This embodiment provides a distributed monitoring device for the internal stress of the surrounding rock of a tunnel, which can accurately measure the magnitude and position of the stress change and the position of the surrounding rock caused by the excavation disturbance.

[0031] See attached figure 1 with figure 2 , The distributed monitoring device for the internal stress of the surrounding rock of the tunnel includes a supporting rod 4, a coupling base 3 and a sensing optical fiber 1.

[0032] The outer side of the supporting rod 4 is provided with the coupling base 3, and the outer side wall of the coupling base 3 is provided with a plurality of first grooves 5 and second grooves 6 along the circumferential direction. The grooves 5 and the second grooves 6 are arranged alternately, the plurality of first grooves 5 are symmetrically arranged along the center of the support rod 4, and the plurality of second grooves 6 are arranged along the longitudin...

Example Embodiment

[0038] Example two

[0039] This embodiment provides a construction method of a distributed monitoring device for the internal stress of the surrounding rock of a tunnel, please refer to the attached image 3 , The method includes the following steps:

[0040] Using the characteristic of Brillouin backscattering stress corresponding to changes in fiber optic sensing technology, the device is placed inside the borehole of the tunnel surrounding rock, which can realize the accurate monitoring of the internal stress of the surrounding rock, and can locate the stress along the range of the device Abnormal change points, complete the information collection of the magnitude and position of the internal stress of the surrounding rock, play an important role in judging the stability of the surrounding rock disturbed by the excavation of the tunnel.

[0041] The distributed monitoring device for the internal stress of the surrounding rock of the tunnel is arranged after the surrounding rock ...

Example Embodiment

[0042] Example three

[0043] This embodiment provides a distributed monitoring method for the internal stress of the surrounding rock of a tunnel. The method includes the following steps:

[0044] S101: Brillouin backscatter occurs after the sensing optical fiber 1 in the monitoring device located in the surrounding rock borehole is subject to longitudinal or transverse stress changes.

[0045] S102: After the Brillouin scattering measuring instrument connected to the sensing optical fiber measures the wavelength offset, data analysis is performed to determine the stress change position and magnitude of the internal stress of the surrounding rock along the device's direction.

[0046] From the above description, it can be seen that the above embodiments achieve the following technical effects:

[0047] (1) It can accurately monitor the size and position of the internal stress of the surrounding rock, making the hidden risk sources of the surrounding rock transparent and controllable, a...

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Abstract

The invention discloses a distributed monitoring device and monitoring method of internal stress of a tunnel surrounding rock, and a construction method. The device comprises a supporting rod member and a coupling base arranged on the outer side of the supporting rod member, a plurality of first grooves and second grooves arranged in a stagger manner are formed in an outer side wall of the coupling base along the circumferential direction, and sensing optical fibers are uniformly distributed in each second groove. The method comprises the steps of: deploying the distributed monitoring device of the internal stress of the tunnel surrounding rock in a drill hole of the tunnel surrounding rock; after the distributed monitoring device of the internal stress of the tunnel surrounding rock is deployed in the drill hole of the tunnel surrounding rock, performing hole sealing slip casting treatment on the drill hole of the surrounding rock; generating, by the sensing optical fibers located inthe monitoring device in the drill hole of the surrounding rock, Brillouin backscattering after being subjected to a longitudinal or lateral stress change; and after a Brillouin scattering measuring instrument measures the change amount of the sensing optical fibers, performing data analysis to determine the stress change position and size of the internal stress of the surrounding rock along the direction.

Description

technical field [0001] The disclosure relates to the technical field of monitoring the stability of surrounding rock in underground engineering, and in particular to a distributed monitoring device for internal stress of surrounding rock of a tunnel, a construction method, and a monitoring method. Background technique [0002] The Brillouin scattering characteristic of optical fiber is an excellent physical information monitoring method, which can realize the stress monitoring of the optical fiber direction range with a continuous distance of tens of kilometers. Deep scattering, the offset of the optical frequency and the stress change of the optical fiber itself are in a linear relationship, so based on this linear change feature, the offset of the optical frequency can be converted into the force around the optical fiber, which is realized by the device of the present invention Surrounding rock internal stress monitoring. [0003] At this stage, this technology has been s...

Claims

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Application Information

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IPC IPC(8): G01L1/24
CPCG01L1/242G01L1/247
Inventor 成帅胡慧江李利平石少帅周宗青王升靳昊高上
Owner SHANDONG UNIV
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