Method for detecting leaked and damaged position of leakproof geomembrane and device thereof

Abstract

The invention discloses a method for detecting damaged pore position of leakproof geomembrane, comprising the steps as follows: firstly, a positive electrode and a negative electrode are arranged respectively on the upper surface and the lower surface of the geomembrane; subsequently, electric potential forms on the upper surface and the lower surface of the geomembrane; subsequently, an electric potential difference movable detector with a reference electrode is employed to sample and detect the electric potential difference of the coverage layer of the geomembrane; finally, the leaked and damaged position can be detected by data processing. The invention also discloses a device for detecting leaked and damaged pore position of leakproof geomembrane, comprising an excitation power supply and the electric potential difference movable detector which is provided with the reference electrode and is used for sampling and detecting the electric potential difference of the coverage layer of the geomembrane. Under a situation that the upper surface of the geomembrane is provided with the coverage layer, the method and the device can exactly detect and position the damaged pore position, repair the damaged pores in time after the coverage layer of the geomembrane is excavated and the pores are exposed, fill the garbage or accumulated water subsequently, effectively prevent garbage leachate containing harmful substance from being leaked outside the landfill site to pollute the underground water, and eliminate the harm to the survival of peripheral people, animals and plants.

Description

technical field [0001] The invention relates to position detection, in particular to a method and device for detecting leakage and damage of an anti-seepage geomembrane used for accurate positioning and survey of seepage holes of an anti-seepage geomembrane. technical background [0002] The geomembrane used in anti-seepage projects such as landfills, artificial lakes, pools, etc., during the process of transportation, welding, and laying leachate sandstone drainage layer or protective layer on it, due to external forces such as construction machinery, the anti-seepage The permeable geomembrane will produce damaged holes or welding defects, resulting in anti-seepage failure and leakage. Landfill leachate containing harmful substances leaks out of the landfill, polluting groundwater and endangering the survival of surrounding people, animals and plants. However, when the geomembrane is covered with a sand and gravel drainage protection cover, it is impossible for the human e...

AI Technical Summary

Problems solved by technology

[0002] The geomembrane used in anti-seepage projects such as landfills, artificial lakes, pools, etc., during the process of transportation, welding, and laying leachate sandstone drainage layer or protective layer on it, due to external forces such as construction machinery, the anti-seepage The permeable geomembrane will produce damaged holes or welding defects, resulting in anti-seepage failure and leakage

Landfill leachate containing harmful substances leaks out of the landfill, polluting groundwater and endangering the survival of surrounding people, animals and plants

However, when the geomembrane is covered with a sand and gravel drainage protection cover, it is impossible for the human eye to find the existence and location of the damaged hole, and corresponding devices and methods must be used to

However, the existing detection devices and methods for geomembrane leakage and damage still have the following problems and defects: ① One method needs to lay dot matrix electrodes under the geomembrane in advance, grid-shaped wiring, which can only be used in projects. The leakage of the geomembrane can only be detected after the geomembrane is damaged; ②The other similar method does not use a reference electrode, resulting in the drift of the measured potential data, and it is impossible to accurately determine the position of the hole

③The output voltage of the excitation power supply is generally less than 300V, which is too low. If there is a large leakage current during the survey process, it is impossible to judge the location of small holes. The power supply has no short-circuit protection, and it is difficult to use it in the field for a long time

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