Optical fiber sensing technology and system for monitoring deformation of geomembrane anti-seepage earth-rockfill dam

A geomembrane, earth-rock dam technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve problems such as the results and examples of the fracture opening of useless geomembrane joints, and achieve rapid performance improvement, scientific and technological level, and improvement. Effectiveness

Active Publication Date: 2017-07-07
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At this stage, there are no results and examples of distributed optical fiber sensing technology system for geomembrane strain and seam fracture opening

Method used

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  • Optical fiber sensing technology and system for monitoring deformation of geomembrane anti-seepage earth-rockfill dam
  • Optical fiber sensing technology and system for monitoring deformation of geomembrane anti-seepage earth-rockfill dam
  • Optical fiber sensing technology and system for monitoring deformation of geomembrane anti-seepage earth-rockfill dam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] (1) Laying of the sensing fiber

[0064] After the PE geomembrane welding operation is completed, according to the layout design drawing of the optical fiber sensing network of the geomembrane anti-seepage system, on the surface of the geomembrane, scribe the consolidation point of the sensing fiber; Moderately shaved; unfold the sensing fiber and lay it in place according to the scribe line (see Figures 2-4).

[0065] (2) Consolidation and positioning process of sensing fiber

[0066] Using a quantitative tensile force, the optical fiber is straightened to generate and maintain a certain initial tensile strain during the consolidation operation. The initial tensile strain of the three sensing fibers should be:

[0067] ●SM tight-buffered fiber——200~600με

[0068] ●Carbon coated SM fiber——300~800με

[0069] ●Fluorinated POF fiber——1000~2000με

[0070] To this end, optical signal demodulators such as BOTDR and OTDR are used in advance to detect the straightened optic...

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Abstract

The invention discloses a distributed optical fiber sensing system and technical schemes. With the distributed optical fiber sensing system and technical schemes adopted, the networked and integrated online telemetry and large-scale multi-parameter space-time full coverage of the geomembrane bi-directional strain and joint fracture opening degree of the geomembrane anti-seepage earth-rockfill dam can be realized, and the scientific and technological content and effectiveness of the safety monitoring of the geomembrane anti-seepage earth-rockfill dam can be significantly improved. A large-range composite sensing optical fiber composed of a unique SM tight tube optic fiber, a carbon coated SM optic fiber and a fluorinated plastic optic fiber, and a supporting BOTDA type optical signal demodulator and a supporting OTDR type optical signal demodulator are adopted; the strain range of the distributed optical fiber sensing system can be up to 40%, in particular, can simultaneously monitor the occurrence, location and opening degree of the joint fracture of the geomembrane; and therefore, the upgrade of a conventional point-type electric measurement strain gauge can be realized, technical blank and difficulty in joint fracture monitoring can be filled and eliminated respectively. An orthogonal sensing network layout mode, optical fiber laying positioning and solidification techniques and an optical fiber mesh initial field establishing method are provided, so that engineering practicability can be realized.

Description

[0001] Distributed Optic-Fiber Sensing Technology and System [0002] for Monitoring of Deformation of Geomembrane Anti-seepage Earth-Rockfill Dam technical field [0003] The invention relates to a distributed optical fiber sensing monitoring system and technical scheme for geomembrane strain and seam fracture of a geomembrane anti-seepage earth-rock dam, which can realize the geomembrane bidirectional strain and weld seam fracture of a geomembrane anti-seepage earth-rock dam Wide range of high-degree distributed optical fiber sensing - multi-functional online telemetry, to obtain reliable observation results, to achieve quantitative - positioning, timely warning. Background technique [0004] (1) Development of geomembrane anti-seepage earth-rock dams [0005] Earth-rock dams are the most widely used in dam engineering, and earth-based anti-seepage dams and concrete slab dams are the main types so far. In recent years, with the development of polymer materials, especia...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01D21/02
CPCG01B11/162G01D21/02
Inventor 陈江刘浩吾张元泽孙曼王琛唐天国
Owner SICHUAN UNIV
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