Method for positioning blockage point in non-metal pipeline by means of ground penetrating radar

Abstract

The invention discloses a method for positioning a blockage point in a non-metal pipeline by means of ground penetrating radar. The method includes the following steps: 1, obtaining test data of a blocked segment in a non-metal pipeline by means of ground penetrating radar; 2, obtaining a random number of scan points of a random number of scan lines, and selecting natural resonant response wave bands of the scan points right over the pipeline; 3, extracting the pole resonant frequency, and obtaining a resonant frequency difference; 4,obtaining a corresponding water level through interpolation; and 5, obtaining a caliber water level ratio sequence, drawing a relation curve of a scan line position and a caliber water level ration, and obtaining a water level sudden drop point, wherein the position of the scan line corresponding to the point is a blockage point of the non-metal pipeline. The blockage point in a non-metal pipeline can be quickly positioned. Therefore, the detection cost is reduced, the on-line detection difficulty is reduced, and the work efficiency is improved.

Description

technical field [0001] The invention relates to the field of applied geophysical prospecting, in particular to a method for locating blockage points in non-metallic pipelines using ground penetrating radar Background technique [0002] In the water supply and drainage pipelines of municipal engineering, such engineering problems are often encountered: the non-metallic pipes buried underground are blocked, and it is necessary to accurately locate the blockage point in order to carry out the next repair, rectification and other projects. In order to carry out accurate and effective positioning work, traditionally available geophysical methods include high-density resistivity method, acoustic wave method, pressure method and so on. [0003] The high-density resistivity method adopts power supply underground, establishes an artificial electric field, and utilizes the electric potential difference of the rock and soil on the surface to divide lithologic strata, guide karst soil c...

AI Technical Summary

Problems solved by technology

[0002] In the water supply and drainage pipelines of municipal engineering, such engineering problems are often encountered: the non-metallic pipes buried underground are blocked, and it is necessary to accurately locate the blockage point in order to carry out the next repair, rectification and other projects

For underground pipelines, it is impossible to arrange sending and receiving equipment at both ends, and it is difficult to implement detection work

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