System for monitoring oil-gas pipeline in mining subsidence area and constructing method thereof

Abstract

The invention discloses a system for monitoring an oil-gas pipeline in a mining subsidence area and a constructing method thereof. The system comprises a pipe body strain monitoring device, a pipe-soil relative displacement monitoring device and a mining subsidence area horizontal deformation monitoring device; a fiber grating strain sensor a (3) and a pipe-soil relative displacement sensor a (4)are arranged on the monitoring section of an oil-gas pipeline a (2) of a mining subsidence area (1); sensors on every section are connected in series by fusing, and are connected with an optical cable a (7) through a fiber junction box a (6); a fiber grating sensing network a (5) is arranged on the top of the pipeline a (2), and is connected with the optical cable a (7) through the fiber junctionbox a (6); the optical cable a (7) is connected with an optical switch (8); the optical switch (8) is connected with a fiber grating demodulator (9); the demodulator (9) is connected with a lower computer (10); the output of the lower computer (10) is connected with a wireless communication module a (11); and the output of a wireless communication module b (12) is connected with an upper computer(13).

Description

technical field [0001] The invention relates to an oil and gas pipeline monitoring system in a goaf subsidence area based on optical fiber grating sensing technology and a construction method thereof, 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 loss of hu...

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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. Currently, there is no report on the joint monitoring of fiber grating sensing technology used in goaf pipe body strain, pipe-soil relative displacement, and gob laying belt soil horizontal deformation.

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