Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle

A technology for optical fiber temperature measurement and geomembrane, which can be used in measurement devices, optical testing flaws/defects, thermometers, etc., and can solve problems such as research or achievement information that has not yet been retrieved

Inactive Publication Date: 2010-08-11
KUNMING UNIV OF SCI & TECH
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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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  • Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle
  • Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle

Examples

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Embodiment Construction

[0037] (1) Manufacture of fiber optic geomembrane

[0038] see figure 1 , in the production process of the traditional geomembrane 1, the optical fiber 2 is arranged in a serpentine manner, thereby obtaining an "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 area without overlapping welding (bonding) of optical fibers, then the single length of the optical fiber Γ 1 = B-2δ; the optical fiber is sensitive to the temperature change within 0.5m on both sides, so the distance between the temperature measuring optical fibers Γ 2 ≤1m (0.6m recommended).

[0039] (2) laying optical fiber geomembrane

[0040] see figure 2 , in the construction process of the anti-seepage project, the above-mentioned optical fiber geomembrane 1 is used as the anti-seepage material, and the construction is carried out according to the current specifications. In order to avoid too many optical fiber joints and...

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Abstract

The invention relates to a rapid damage positioning scheme for an internal geomembrane in anti-seepage engineering, belonging to the technical field of hydraulic engineering (civil engineering)- anti-seepage engineering. The method comprises the following steps of: combining continuous optical fibers and the geomembrane into a whole, wherein the optical fibers are uniformly arranged in a snakelike shape on the geomembrane, and the distance between the optical fibers is not greater than the temperature-sensitive distance of double optical fibers; using the geomembrane as an anti-seepage material and making the optical fiber path of the whole anti-seepage area through; leading out the endpoints of the optical fibers to an optical fiber temperature-measurement detection device and covering aprotective layer of the geomembrane; and establishing a conversion formula between the XY coordinate values of optical fiber length L and an anti-seepage face according to the arrangement design of the anti-seepage engineering, monitoring the temperature of each position of the geomembrane by adopting the optical fiber temperature-measurement detection device, judging the area with abnormal temperature comparison to be a seeping position and judging the position with highest temperature abnormality to be the central position of the geomembrane damage. The method solves the problem of difficult damage positioning of the geomembrane and can obviously improve the safety of a dam using the geomembrane as an anti-seepage body.

Description

technical field [0001] The invention relates to a method for locating a damaged 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 hundred year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01K11/32G01K11/324
Inventor 杨华舒刘海波杨宇璐吴霞陈刚李晋豫殷小林
Owner KUNMING UNIV OF SCI & TECH
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