Monitoring Method of Overlying Rock Detachment Layer Based on Optical Fiber

Abstract

The invention discloses an optical fiber-based method for monitoring the overlying rock detachment layer, which belongs to the field of soil environment monitoring and comprises the steps of: 1. predicting the development range of the overlying rock detachment layer; 5 fixed-point optical fibers, and design a specific plan for overburden detachment monitoring based on the "dichotomy method": 4. Customization and embedding of fixed-point optical fibers; The development position, size and development law of rock detachment layer. The present invention is based on optical fiber technology. The optical fiber is both a sensing element and a transmission element. It can not only monitor the tensile deformation of the separation layer, but also monitor the compression deformation of the separation layer, which is conducive to the study of the development process of separation layer expansion-closure-stability. Moreover, the present invention adopts five fixed-point optical fibers designed based on the "dichotomy method", which can accurately determine the development position and size of the overlying rock detachment layer, which is beneficial to the grouting of the detachment layer to reduce subsidence, prevent ground subsidence, and protect the soil environment.

Description

technical field [0001] The invention relates to the technical field of soil environment monitoring, in particular to an optical fiber-based monitoring method for overlying rock detachment layer in a stope. Background technique [0002] With the mining of the coal seam, the stress balance state of the rock mass around the goaf is broken, and the overlying strata undergo deformation movements such as collapse, fracture, and bending, and successively form caving zones, water-conducting crack zones, and bending subsidence from bottom to top. When the abscission space in the curved subsidence zone is closed, the overlying rock movement will develop to the surface, and the ground will collapse, which will bring huge losses to people's production, life, transportation, etc., and affect the ecological environment and sustainable economic development. Goaf subsidence changes the mechanical and chemical properties of the soil, destroys cultivated land and grassland, causes low-lying g...

AI Technical Summary

Problems solved by technology

However, compared with the roof of the gob in the working face, the roof of the roadway in this patent has less movement of the overlying rock, a smaller monitoring range, simple development of the separation layer, and a smaller height of the separation layer. Size change and development law of overlying strata detached layer in stope

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