Distributed optical fiber testing method for porous medium structure seepage

A technology of distributed optical fibers and porous media, which can be used in suspension and porous material analysis, permeability/surface area analysis, measurement devices, etc., and can solve problems such as immaturity of theory

Active Publication Date: 2013-10-23
HOHAI UNIV
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  • Application Information

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Problems solved by technology

However, the theory of this technology in the application of seepage monitoring is still immature, especially the quantitative relationship model between the temperature rise of optical fiber heating, seepage flow velocity, ambient temperature, and heating power has not been established. It is of great significance to develop seepage monitoring methods and devices

Method used

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  • Distributed optical fiber testing method for porous medium structure seepage
  • Distributed optical fiber testing method for porous medium structure seepage
  • Distributed optical fiber testing method for porous medium structure seepage

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Embodiment 1

[0050] Embodiment 1: The porous media structure seepage velocity monitoring device based on the total heat transfer coefficient of the present invention, the schematic diagram of the device is as follows figure 1 As shown, it includes a heating system 1, a distributed optical fiber temperature sensing system 2, a porous medium structure model tank 3 embedded with a monitoring optical fiber, and a water outlet system 4; the heating system 1, the distributed optical fiber temperature sensing system 2 and the water outlet system The system 4 is respectively connected with the porous medium structure model tank 3 .

[0051] The heating system 1 is a parallel circuit mainly composed of an AC power supply 11, a voltage regulator 12, and a load heating resistance wire 13. The monitoring optical fiber is heated through the load heating resistance wire 13, and the heating power is controlled by controlling the voltage through the voltage regulator.

[0052] The distributed optical fibe...

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Abstract

The invention discloses a distributed optical fiber testing method for porous medium structure seepage. The method comprises the steps of: (1) constructing a porous medium structure model groove; (2) forming a uniform and steady seepage field; (3) conducting temperature monitoring on the target optical fiber embedded in the model groove; (4) carrying out ohmic heating operation on the target optical fiber; (5) measuring the temperature rise curves of different heating power under the steady seepage condition; (6) constructing a heat transfer equation of a total heat transfer coefficient of the optical cable; (7) representing the heat transfer between optical fiber and a seepage containing saturated porous medium by the total heat transfer coefficient; (8) measuring the temperature rise curves of different heating power under the condition of different seepage rates; and (9) monitoring the seepage rate. The method provided in the invention establishes an empirical relationship mathematical model of the seepage rate total heat transfer coefficient, accurately pinpoints the linear correlation between the seepage rate and an average total heat transfer coefficient, and reliably guarantees the monitoring precision.

Description

technical field [0001] The invention relates to a distributed optical fiber test device and method for percolation of a porous medium structure. Background technique [0002] The main problems faced by earth-rock dam projects in my country are leakage, piping, collapse, cracks, landslides, damage to slope protection, erosion and cavitation, etc. According to statistics, more than one-third of the damage in earth-rock dam projects is due to different degrees of seepage Leakage and various problems derived from leakage, more than 90% of embankment collapses are caused by leakage damage. [0003] A large amount of engineering experience shows that it is of great significance to strengthen the real-time positioning and quantitative monitoring of seepage and seepage deformation of earth-rock dams to ensure the safe operation of the project. The seepage problem of earth-rock dams has the characteristics of time-space randomness and concealment, and the initial magnitude is small. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N25/20G01K11/32G01K11/322G01K11/324
Inventor 苏怀智崔书生杨孟田始光蔡婷婷
Owner HOHAI UNIV
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