Method and system for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area

Abstract

The invention discloses a method and a system for monitoring pipe-soil relative displacement of an oil-gas pipeline in a mining subsidence area based on a fiber grating sensing technology. The method comprises the following steps of: demodulating and preprocessing a wavelength signal acquired by a sensor on a field monitoring station, and remotely transmitting the signal to a remote monitoring center; receiving data by the monitoring center, further analyzing and processing the data with a specific algorithm, and computing pipe-soil relative displacement change in the mining subsidence area; dynamically displaying the pipe-soil relative displacement change in the mining subsidence area to judge the state stabilities of pipe body strain change and soil body strain change, and judging whether the data surpass threshold values; making an alarm when the monitored value of pipe-soil relative displacement surpasses a preset value and keeps constant; when a parameter value is smaller than a threshold value, judging that the pipeline is in a safe state; and when a pipe-soil relative displacement value reaches a threshold value and keeps constant, performing pipeline safety early-warning.

Description

technical field [0001] The invention relates to a method and system for monitoring the relative displacement of oil and gas pipelines in goaf subsidence areas based on optical fiber grating sensing technology, and relates to the technical fields of stress measurement, temperature measurement, similar linear dimension measurement, and pipeline systems. Background technique [0002] The space formed after the underground mine is mined is called the goaf. After the underground mineral layer is mined, the upper rock layer loses its support, the balance condition is destroyed, and then it bends and collapses, so that the surface sinks and deforms, causing the surface to subside and form a depression. With the continuous expansion of the goaf, the depression continues to develop and form the goaf subsidence area, which will cause damage to the above-ground or underground buildings (structures). Goaf subsidence disaster is one of the main forms of geological disasters that cause l...

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Problems solved by technology

[0018] Due to these advantages, in the field of geotechnical engineering, fiber grating sensors are easy to embed in rock and soil for high-resolution and wide-range measurement of internal strain and temperature. The technical advantages are very obvious, especially in the ability to obtain long-term, Reliable deformation data of rock and soil, there is no report on the application of fiber grating sensing technology in the monitoring of relative displacement of pipe and soil in goaf

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