A system and method for monitoring the stability of a gob-side entry retaining filling body during recovery

Abstract

The invention discloses a system and a method of monitoring the stability during a gob-side entry retaining filling body stoping period. The system comprises embedded strain gauges and pressure boxes, wherein a row of embedded strain gauges and a row of pressure boxes are embedded in the gob-side entry retaining filling body; the embedded strain gauges and the pressure boxes are arranged parallelly and are fixed by using support steel wires; end parts of the embedded strain gauges and the pressure boxes are connected with a cable; and data are transmitted to a portable strain signal acquisition system through the cable. An intervention measurement means is adopted, and the stress-strain inside the gob-side entry retaining filling body, the development condition in a plastic zone and the residual stress can be reflected; as the vibrating-wire strain gauges and the pressure boxes are adopted, the mounting is convenient, the insulation explosion-proof performance is strong, long-distance transmission is undistorted, and the system and the method are applicable to long-term monitoring in a downhole abominable environment.

Description

technical field [0001] The invention relates to a system and method for monitoring the stability of a gob-side entry retaining filling body during mining, and belongs to the field of mining. Background technique [0002] Gobside retention means that the upper section of the transport alley is preserved by constructing an artificial filling belt, and reused as the upper section return air tail alley and the lower section return air alley. Gobside retaining has the advantages of high resource recovery rate, reasonable excavation connection, low roadway excavation rate, etc., and is conducive to the reform of roadway layout. It has been an important technical development direction for underground resource mining at home and abroad for many years. Due to the two strong mining impacts of the upper and lower sections of the working face, the surrounding rock of the gob-side retaining entry is violently active and difficult to maintain. The bearing capacity and stability of the fil...

AI Technical Summary

Problems solved by technology

Due to the complexity of the underground mining environment, there are many interference factors during monitoring. At present, there is still no effective method to monitor the stability of the gob-side entry filling body during the second mining.

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