Abstract:
An underground metal mine in Shandong has a mining depth of more than 1 000 m, and the burial depth of proven ore bodies is more than 2 000 m. By taking the completed construction of the TK1
# as the research object, a deep ground stress test was carried out based on the acoustic emission technique to obtain the ground stress data at different depths, aiming to ensure that the deep development project and deep resources are completely built and put into production. On this basis, the classification evaluation of rock burst proneness of rock bodies at different depths was conducted, with the intrinsic mechanism of rock bursts analyzed and preventive and control measures investigated. The results show that the direction of the ground stress at different depths is basically the same and the relative size of the horizontal differential stress in the mining area is larger than the local average. When the depth is less than 1 000 m, the ground stress value is basically under 35 MPa, while under larger depth, especially more than 1 600 m, the horizontal principal stress is more than 50 MPa, and the risk level of rock bursts is a strong rock burst. This shows that the horizontal tectonic stress in the mining area is obvious, and ground stress values and rock burst proneness indexes increase with the rising depth. Additionally, it is necessary to take corresponding measures such as support and stress relief before carrying out deep mining.