Abstract: The strength parameter of the rock mass varies with space and time. Microseismic monitoring datum during the rock mass failure of Shirengou iron mine was processed and analyzed and three parameters (microseismic events number, accumulated energy, average distance between the events) were obtained. Combined with numerical calculation result of stress field, correspondence of microseismic datum variables and stress variables was built by analyzing evolution law of microseismic monitoring datum and stress field datum with underground rock mass failure. Dynamic calibration method of rock mass strength parameter was proposed based on microseismic monitoring datum by parameter inversion, and safety coefficient of underground rock-mass stability was obtained. The results showed that dynamic calibration of rock mass strength parameter is very achievable by analyzing microseismic monitoring datum and the stress field, thus providing a quantitative analysis method for dynamic evaluation of rock mass satiability of underground mine.

Key words: microseismic monitoring, rock mass strength parameter, dynamic calibration method；rock-mass stability, microcrack