Monitoring determining method for working face goaf lateral coal plastic area width

A monitoring determining method for the working face goaf lateral coal plastic area width comprises the steps that (a) within the range of advancing a working face by 50 m to 100 m, a plurality of horizontal holes with different depths are drilled in a non-mining wall of a mining roadway; (b) a borehole stressmeter is arranged in each horizontal hole; (c) the borehole stressmeters are all connected to a signal connection station, the signal collection station is arranged in the mining roadway, and the working face is advanced by 200 m to 300 m; (d) the borehole stressmeters and the signal connection station are powered on, and vertical stress of monitoring points is begun to be continued to be monitored; (e) when the working face to be mined is pushed and mined to the position 10 m to 20 m away from the signal collection station, a stress change curve is generated; (f) the type of the stress change curve of the monitoring points is determined, and the working face goaf lateral coal plastic area width is determined. The monitoring determining method is convenient to operate, safe, reliable and high in accuracy.