Monitoring device and monitoring method for mining FBG (fiber bragg grating) roof separation layer

Abstract

The invention provides a monitoring device and a monitoring method for a mining FBG roof separation layer. The device comprises a vertical measurement barrel and a packaging casing, wherein fixed pulleys, tape pulleys and constant-strength cantilever beams are symmetrically arranged in the packaging casing; a steel wire rope penetrates through the tape pulleys and the fixed pulleys and penetrates out from a steel wire rope guide hole in the top part of the vertical measurement barrel; one end of the steel wire rope is connected with an anchor head; a shallow part measurement point and a deep part measurement point are distributed inside a drill hole; the anchor head is pushed to the measurement points in the drill hole; when the stress of the steel wire rope changes, the stress change is displayed through wavelength values of an FBG A and an FBG B; a wavelength demodulation device is used for demodulating the wavelength values into digital signals, the digital signals are sent to a computer for real-time processing, and a separation layer numerical value is combined for drawing a separation layer quantity changing curve and a set separation layer boundary value; whether the separation layer exists is judged; and the data change of the roof separation layer is monitored in real time. Temperature compensation is performed with a differential form, on-line measurement of the roof separation layer is realized, the reliability and the accuracy are high, an early warning signal can be issued, and roof fall accidents can be avoided.

Description

Technical field

[0001] The invention relates to a monitoring device and a monitoring method, in particular to a mine optical fiber grating roof separation monitoring device and a monitoring method suitable for the measurement and early warning of the roof collapse of coal mine roadways and mining working faces. Background technique

[0002] In recent years, with the continuous improvement of my country's coal mining technology, my country's coal mining industry has developed better and faster. However, as the depth of coal mining continues to deepen, the pressure on the coal mines has become more obvious and the disasters caused are becoming more and more serious. Roof separation is one of the main forms of deformation and destruction of the surrounding rock of the roadway. For the roadway supported by bolts, the roof separation is the biggest hidden safety hazard; the separation of the roof of the roadway needs to be monitored at any time to understand the anchor The reasonablen...

Images