The Influence of Stoping Sequence and Various Rock Mechanics Parameters on Backfill Failure in Hard Rock Mining with Delayed Backfilling: The Review and Field Data Analysis Study

摘要

The profitability of a mining operation and the safety of the mining environment are of the utmost important in the present global competitive market. It is well known that backfill failure and or ore dilution has a direct influence on the cost of a mining operation in the case of underground hard rock mining with delayed backfilling. An overview of the various influencing parameters affecting backfill and ore dilution through the detailed review on the subject is presented in this paper. Also, a representative case study from a longhole blasting stoping environment is presented and discussed with. Through the review studies, it is found that different stope geometry parameters including planned stoping sequence have a direct influence on the ore dilution as well as the backfill stability. It is also emphasized through this study that dynamic strength consideration and effect of blast induced damage needs to be considered while designing the fill strength. The studies presented in this paper demonstrate the role of the various discussed parameters in the above on backfill failure, thus resulting dilution of the economical ore as well as the stability problems. The study illustrates the relationship between measured backfill overbreak, stope geometry and type, planned mining sequence as well as various other rock mechanics parameters etc.