Mutambo, Victor та Mukuka, Moses (2024) MODIFIED GEOMECHANICAL DEPENDANT SEISMIC MORNITORING ARRANGEMENT FOR PREDICTING ROCK BURSTS AND FAILURES IN SESIMICALLY ACTIVE MINING BLOCKS AT MUFULIRA MINE. UNIVERSITAS Publishing. с. 119-127.

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English abstract

Mufulira mine is predominantly rich in copper mineralization. Due to increase in mine depth (1,557m), the mine has been experiencing rock failures and rock bursts. This has necessitated changes in mining sequences to suit the present geo- mechanical conditions such as development of de-stressing cross-cuts between 62 and 64 blocks to prevent possible rock bursts and rock falls. This study conducted geotechnical investigations for intact rock mass to determine un- confined compressive strength (UCS), secant and tangent Young’s Modulus (E Sec and E Tan), secant and tangent Poisson's Ratio (ν Sec and ν Tan), Brazilian and tri-axial compres- sive strength tests as well as geological field mapping to understand the Geo-mechanics mechanisms controlling rock burst prone mining blocks at Mufulira mine. Laboratory findings have established high values of tensile strength ranging from 7 MPa to 12.1 MPa, Uniaxial Compressive Strength (UCS) ranging from 126 MPa to 226 MPa and tri-axial compressive strength ranging from 124 MPa to 466 MPa. Damage mapping conducted in the footwall drives, cross-cuts and mining drives excavations indicate that there is a changing stress loading as one move away from the retreating stope face to the east. Based on above results, an early warning monitoring system based on seismic monitoring system at Mufulira mine has been modified to suit the changing nature of geotechnical and geological parameters.

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