Method and system for monitoring horizontal deformation of soil body in mined-out subsidence area and method for constructing system

A technology of horizontal deformation and collapse area, used in the measurement of similar linear dimensions and piping systems, measurement fields

Inactive Publication Date: 2012-02-08
PETROCHINA CO LTD
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  • Abstract
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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 rock and soil deformation data, there is no report on the application of fiber grating sensing technology to monitor the horizontal deformation of soil in the goaf pipeline laying belt

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  • Method and system for monitoring horizontal deformation of soil body in mined-out subsidence area and method for constructing system
  • Method and system for monitoring horizontal deformation of soil body in mined-out subsidence area and method for constructing system
  • Method and system for monitoring horizontal deformation of soil body in mined-out subsidence area and method for constructing system

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Embodiment

[0083] Embodiment. This example is an experimental method and system, and its constitution is as Figure 1-Figure 7 shown. The test was carried out in a goaf subsidence area with mining depth ratio of 10, mining length of 15m, pipeline buried depth of 3m and pipeline length of 130m. The diameter of the pipeline is 168mm, the wall thickness is 6mm, and the steel grade is L245.

[0084] The process flow of the real-time online monitoring method of soil horizontal deformation in goaf subsidence area based on fiber grating is as follows: figure 1 shown. After the wavelength signal collected by the sensor is demodulated and preprocessed at the on-site monitoring station, it is remotely transmitted to the off-site monitoring center. After receiving the data, the monitoring center further analyzes and processes the data through a specific algorithm to calculate the collapse of the goaf. The horizontal deformation changes, so as to judge the state stability of the soil strain change...

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Abstract

The invention relates to a method and a system for monitoring horizontal deformation of a soil body in a mined-out subsidence area and a method for constructing the system. A fiber grating sensor network a(3) monitors the horizontal deformation of a soil body above a pipeline a(2) in real time, acquired data passes through an optical cable a(5) and an optical switch (6) and is demodulated by a fiber grating demodulation instrument (7) and transmitted to a lower computer (8), and the lower computer (8) calls a self-compiled program to control the optical switch (6) and the fiber grating demodulation instrument (7), so that the data is acquired and preprocessed; the preprocessed data is transmitted by a general packet radio service (GPRS) communication module a(9), received by a GPRS communication module b(10) and transmitted to an upper computer (11); and the upper computer (11) analyzes the horizontal deformation data of the soil body, and determines the stable state of the soil body in the mined-out subsidence area and the safety state of the pipeline according to the change of a monitoring curve and a monitoring numerical value.

Description

technical field [0001] The invention relates to a method and system for monitoring horizontal deformation of soil in a goaf subsidence area and a construction method of the system based on fiber grating sensing technology, and relates to the technical fields of measuring stress and temperature, measuring similar linear dimensions, 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/00E21F17/18G01B11/16
Inventor 吴张中马云宾郝建斌韩冰荆宏远刘建平谭东杰蔡永军邱红辉
Owner PETROCHINA CO LTD
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