METHOD FOR POSITIONING MAIN CRACK OF COAL ROCK IN DYNAMIC DISASTER PRECURSOR OF COAL ROCK BY MEANS OF ELECTROMAGNETIC RADIATION

摘要

A method for positioning the main crack of a coal rock in a dynamic disaster precursor of the coal rock by means of electromagnetic radiation, comprising: providing four or more three-component electromagnetic sensors in an underground roadway, each sensor consisting of three directional electromagnetic signal receiving antennas orthogonal to each other, acquiring electromagnetic signals by means of a monitoring host, and using an atomic clock to ensure that the signals received by different sensors are strictly synchronous; using the frequency of the electromagnetic signals as feature parameters, selecting and ensuring that electromagnetic signals generated by the same crack are received by different antennas, separately performing vector overlay on the signal intensity of three channels of each electromagnetic signal sensor, and determining the direction of a magnetic induction line of the position of the sensor; obtaining, according to the direction of the magnetic induction line, a propagation direction plane perpendicular to said direction; and determining the position of the crack of a coal rock by means of the intersection of the electromagnetic propagation direction planes determined by the plurality of sensors.