中国矿山工程

The Panjiatian Iron Mine is transitioning from open-pit to underground mining. To better design the shaft and tunnel engineering and address the potential rock-burst risks associated with deep ore body extraction, hydrostatic fracturing is used for in-situ stress testing, and energy accumulation simulation combined with rock mechanics parameters is employed for rock-burst prediction.The test principles methods of hydro-fracturing in-situ stress measurement are briefly described. The results show that the horizontal stress is predominant, the maximum principal stress of DH02 is between 7.52MPa and 17.86MPa; and Multiplex drill hole is between 7.08MPa and 15.8MPa; the direction of the maximum principal stress is NW. Analyse probable rock burst of the ore-body according to the measured monitoring results and rock mechanical parameters, the results show that there is approximately no rock burst in the ore-body, and suitable for tunnel. In-situ stress measurement provides scientific basis for the tunnel layout and roadway support design in Panjiatian Iron Mine．