Method for monitoring underground pipeline leakage by using DTS and self-heating armored optical fiber

Abstract

The invention relates to a method for monitoring underground pipeline leakage by using DTS and a self-heating armored optical fiber. The method comprises the following steps of: S1, in the installation process of an underground pipeline, connecting the self-heating optical fiber with the pipeline in parallel in the length direction of the pipeline; S2, during penetration detection, connecting the self-heating optical fiber with a direct-current power supply and a DTS optical fiber demodulator; and S3, heating the self-heating optical fiber by using a direct-current power supply, acquiring the on-way change of optical fiber temperature of the self-heating optical fiber by using the DTS optical fiber demodulator, and determining a leakage point by using the abnormal change of the temperature. The principle that the DTS self-heating optical fiber can detect abnormal temperature is introduced into underground pipeline leakage detection, the relation between the temperature change of the self-heating optical fiber and the underground pipeline leakage point is accurately determined through experiments, and accurate monitoring of underground pipeline leakage and accurate prediction of ground subsidence are achieved.

Description

technical field [0001] The invention relates to the technical field of underground pipeline leakage monitoring, in particular to a method for monitoring underground pipeline leakage by using DTS and self-heating armored optical fiber. Background technique [0002] At present, my country's urbanization process is getting faster and faster, but reports of road collapse disasters are often heard. Ground subsidence leads to ground subsidence, traffic interruption, rupture of gas-gas-water pipes, pedestrians and vehicles falling into pits, deformation and collapse of houses, etc., seriously affecting social safety and causing serious losses. After investigation, ground subsidence is divided into many types, among which the main cause of urban ground subsidence is the leakage of underground pipelines. Groundwater leakage leads to latent erosion and soil erosion. After the soil is eroded, a cavity is formed underground, and the roof of the cavity may collapse under external influe...

AI Technical Summary

Problems solved by technology

At present, CCTV pipeline robots, road surface deformation monitoring, ground penetrating radar monitoring, road excavation detection and other means are usually used to detect these underground caves, but ground penetrating radar monitoring and other means cannot detect the leakage of underground pipelines

At the same time, these surveys are often done on an annual basis and cannot monitor underground pipelines that later leak

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