“Point-area” combined with the observation of roof “three zones” technology application research

According to the trend of the development of “three zones” observed technology,in combination with the practical situation of five rounds mountain coal mine 1805 face,put forward the “point line-the area” combined with the observation of roof “three zones” technology.By empirical calculation method,borehole imaging method,network parallel electrical method and comprehensive analysis of 1805 working face roof key stratum “three zones” development pattern carries on the observation and analysis,using YTJ-20 layers detection data recorder for static point line observation,and WBD-type I network parallel electrical instrument for dynamic observation,and mutual authentication observation results of the analysis.Observation analysis to determine 8 coal roof of 1805 face caving zone development height is 7-9 m,fracture zone height of 30-37 m,bending subsidence zone height is more than 37 m.Field observation and theoretical analysis,the combination of point,line and regional observations,and combined to enhance the reliability of observations.