Principal Component Analysis on Electromagnetic Radiation Rules while Fully Mechanized Coal Face Passing Through Fault

摘要

Taking the small fault as research background, which existence ahead of fully mechanized coal face, the roadway stability were monitored by the means of electromagnetic radiation instrument. Combining with X-Ray Diffraction experiments, the changes of roadway's coal and rock mass energy were achieved from the microscopic view. The results of X-Ray Diffraction experiments show that coal and mass microcosmic composition were silicate minerals which have lower conductivity and loss smaller energy than a true reflection of the monitoring results when the electromagnetic wave propagation, meanwhile, monitoring results can be more true reflection of the electromagnetic radiation energy changes in the coal and rock mass. And the monitoring results of electromagnetic radiation energy show that little or no energy accumulation in fault location while the distance between working face and the fault more than 70m, but the energy dramatic changes while the distance within 10m. Electromagnetic radiation energy value through steady-increase-the maximum-decreases, which indicates a larger energy accumulation appear in front zones as the value increases again. Base on principal component method, the monitoring points which arranged 20m in front of fault can fully obtained the coal and rock mass internal energy accumulation and release rules.