Laws of strata energy release and corresponding safety warning system in metal mine

The strata deformation in mining area was monitored in Dabaoshan copper-iron mine, and an analytical method of strata energy release was put forward. On the basis of chaotic theory, by reconstructing the phase space for time series data of strata energy release, the saturated embedding dimension and the correlation dimension of the dynamic system were obtained to be 4 and 1.212 8, respectively, and the evolution laws of distances between phase points of strata energy release in the phase space were revealed. With grey theory, a prediction model of strata energy release was set up, the maximum error of which was less than 6.7%. The results show that there are chaotic characters in strata energy release during mining; after reconstructing phase space, the subtle changing characteristics of energy release can be magnified, and the internal rules can be fully demonstrated. According to the laws, a warning system for strata stability in mining area was established to provide a technical safeguard for safe mining.