Research Article
Muckpiles Influence Againts Pillar Stability in Panel 26 and 27 West Drawpoint 43-44 Grasberg Block Cave (GBC) PT. Freeport Indonesia
@INPROCEEDINGS{10.4108/eai.30-8-2021.2312436, author={Willy Adhitama and R. Andy Erwin Wijaya and Bayurohman Pangacella Putra}, title={Muckpiles Influence Againts Pillar Stability in Panel 26 and 27 West Drawpoint 43-44 Grasberg Block Cave (GBC) PT. Freeport Indonesia}, proceedings={Proceedings of the 2nd International Conference on Industrial and Technology and Information Design, ICITID 2021, 30 August 2021, Yogyakarta, Indonesia}, publisher={EAI}, proceedings_a={ICITID}, year={2021}, month={10}, keywords={squeezing yielded zone displacement}, doi={10.4108/eai.30-8-2021.2312436} }- Willy Adhitama
R. Andy Erwin Wijaya
Bayurohman Pangacella Putra
Year: 2021
Muckpiles Influence Againts Pillar Stability in Panel 26 and 27 West Drawpoint 43-44 Grasberg Block Cave (GBC) PT. Freeport Indonesia
ICITID
EAI
DOI: 10.4108/eai.30-8-2021.2312436
Abstract
Changes in stress and increased muckpiles in the block caving method can cause instability in the pillar. The effect of changing stress and increasing muckpiles will cause an increase in displacement and yielded zone in the production tunnel. Based on the results of convergence measurements, on panels 26 and 27 West Drawpoint 43-44, stable results are obtained with displacement speeds of 0.0225 mm / hour and 0.0271 mm / hour using the stability criteria of Zhenxiang. Based on the analysis of the potential squeezing from the actual displacement measurement, Panel 26 and 27 West Drawpoint 43-44 are indicated to have severe squeezing problems with% strain values of 2.51% and 2.56%. Based on the results of the displacement analysis using Phase2 software, on Panel 26 and 27 West Drawpoint 43-44, the% horizontal strain values were 3.36% and 4.11% (severe squeezing problems) and% vertical strain was 3.9% ( \severe squeezing problems) and 5.045% (very severe squeezing problems) with a HOD height of 270 meters (Grasberg bottom pit). Based on the results of numerical analysis, the yielded zone will continue to increase until it enters the 10 meter HOD with the assumption that in the 10 meter HOD phase the yield area has reached a stable point.