Evaluating the Whole-Body Vibration Exposure in Rock Breaker Operators: Influence of Rock Type and Operational Parameters

This study aims to evaluate the Whole-Body Vibration (WBV) exposure of rock breaker operators in surface mining, focusing on limestone, banded hematite quartzite, and granite gneiss rocks. Using a seat pad tri-axial accelerometer, operators were monitored across varying impact powers, Rock Mass Cuttability Index (RMCI), and net breaking rate (NBR). Results indicate that operators exceeded the Exposure Action Value (EAV) of 0.5 m/s2 and the Vibration Dose Value (VDV) of 9.1 m/s1.75 while operating in limestone and granite gneiss rocks. Moreover, hydraulic rock breaker operators surpassed the Exposure Limit Value (ELV) of 1.15 m/s2 and the VDV of 21 m/s1.75 for the granite gneiss rocks, based on A(8) and VDV(8) derived limits. Notably, operators breaking banded hematite quartzite rocks experienced lower vibration amplification. RMCI and impact power emerged as critical factors in WBV exposure, underscoring the need for optimal settings to mitigate excessive vibrations. These findings underscore the importance of managing WBV for operator health and safety in surface mining operations.