Evaluation of excavation method on point load strength of rocks with poor geological conditions in a deep metal mine

Abstract In the field of deep mining engineering, it poses a challenge to promptly determine mechanical properties rocks under poor geological conditions through in-situ tests. However, indirect determination uniaxial compressive strength (UCS) can be achieved point load index (PLSI) test on irregular samples. present study, laboratory and PLSI tests were carried out ore rock blocks extracted methods from stope at lead–zinc mine in Yunnan Province, China, with depth approximately 1000 m. The effects excavation drilling-blasting ores are compared. It is found that there significant differences indexes obtained by different methods, I s (50) after method approximates actual value surrounding rocks. Two correction utilized obtain (50)-1 (50)-2 correlation factors ( k ) linking UCS Brazilian splitting derived based testing results. findings indicate using conversion factor recommended ISRM predict may significantly underestimate intricate environments. This study serve as benchmark for analogous projects.