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Method for detecting breakage position of built-in geomembrane by fiber strain

A technology of optical fiber strain and geomembrane, applied in the direction of measuring devices, optical devices, instruments, etc., can solve problems such as research or achievement information that has not been retrieved

Inactive Publication Date: 2010-08-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

However, in terms of "determination of the damaged part of the built-in geomembrane", no research or achievement information has been retrieved

Method used

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  • Method for detecting breakage position of built-in geomembrane by fiber strain
  • Method for detecting breakage position of built-in geomembrane by fiber strain
  • Method for detecting breakage position of built-in geomembrane by fiber strain

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Embodiment Construction

[0038] (1) Manufacture of thin-diameter optical fiber geomembrane

[0039] see figure 1 , In the production process of the traditional geomembrane 1, the process is added, and the thin-diameter (for example, 50 μm) optical fiber 2 is closely bonded in a serpentine manner, thereby obtaining a "fine-diameter optical fiber geomembrane". Let the width of the geomembrane be B, and leave δ (recommended 0.25m) at the edge of the geomembrane as the overlapping welding (bonding) area without optical fiber, then the single length of the optical fiber Γ 1 = B-2δ; the optical fiber is sensitive to the strain change within 0.4m on both sides, so the distance between optical fibers Γ 2 ≤0.8m (0.6m recommended).

[0040] (2) laying optical fiber geomembrane

[0041] see figure 2 , in the construction process of the anti-seepage project, the above-mentioned thin-diameter optical fiber geomembrane is used as the anti-seepage material, and the construction is carried out according to the c...

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Abstract

The invention relates to a scheme for quickly positioning breakage of an inner geomembrane in anti-seepage engineering, belonging to the technical field of anti-seepage in hydraulic engineering (civil engineering). The method of the invention comprises the following steps of: integrating continuous fibers and the geomembrane, wherein the fibers are arranged uniformly like a snake in the geomembrane, and the distance among the optical fibers is less than or equal to a strain sensitive distance of double fibers; taking the geomembrane as an anti-seepage material and conducting light paths of the fibers in the whole anti-seepage area; leading out the terminals of the fibers to a fiber strain detecting device for covering a protective layer of the geomembrane; and according to the arrangementdesign of the anti-seepage engineering, establishing a conversion expression between the fiber length L and the XY coordinate values of an anti-seepage surface. Fiber open circuit or abnormal strain caused by the breakage of the geomembrane can be found by a distributed detection system, and the breakage position of the geomembrane can be quickly and accurately determined by the conversion between the fiber length and a laying distance, thereby gaining precious emergency repair time for a dam of which the geomembrane is damaged, and effectively reducing the occurrence of dam collapse disasters.

Description

technical field [0001] The invention relates to a solution for quickly locating damage of a geomembrane inside an anti-seepage engineering, and belongs to the technical field of water conservancy engineering (civil engineering)-anti-seepage. Background technique [0002] Seepage damage is the most important cause of dam collapse disasters. Among the constituent materials of the anti-seepage body, geomembrane is cheap, has good anti-seepage effect, and has the obvious advantage of adapting to the deformation of the dam body and foundation. It is almost the preferred material in earthquake-prone areas, especially in karst landform areas. Since the relevant technology was introduced into my country in the 1970s, a complete set of standards and procedures for geomembrane production, inspection, anti-seepage body design, construction quality control, and acceptance has been formed, and the overall life span has also been significantly improved—life expectancy It has been nearly a...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 杨华舒杨宇璐刘海波吴霞黄继伟
Owner KUNMING UNIV OF SCI & TECH
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