Open AccessProbabilistic Of Slope Failure Grasberg Open Pit Mining PT Freeport Indonesia
Author(s) -
Iswandaru Iswandaru,
Rully Nurhasan,
Made Astawa,
Ridho Kresna Wattimena
Publication year - 2019
Publication title -
promine/promine
Language(s) - English
Resource type - Journals
eISSN - 2620-7737
pISSN - 2354-7316
DOI - 10.33019/promine.v7i1.1064
Subject(s) - geology , rock mass classification , slope stability , geotechnical engineering , slope stability probability classification , slope stability analysis , mining engineering , open pit mining , slope failure , rock mass rating , probabilistic logic , mathematics , statistics
The stability of a slope in mining activities is highly influenced by geology, especially thenature of rocks and geological structures. Slope stability analysis will be faced with severalproblems in the uncertainty of rock properties and rock mass. Slope stability analysis usingprobabilistic methods offers a more systematic way of treating conditions of uncertainty andprovides other alternatives to the value factor approach to security regarding information onthe probability of a slope failure.Grasberg Open Mine rock type classification based ongeotechnical parameters or Geotechnical Rock Code (GTRCK) classifies rocks based onrock type, rock mechanical properties, hydrothermal alteration type, clay content and RockQuality Designation (RQD) to 46 types of GTRCK. The GTRCK type which has a low rockmass strength value is a change in intrusive rock minerals and a low RQD value such as alot of clay material is exposed in the Northeast and Southwest of the Grasberg Open PitMine.The overall slope probabilistic modeling of the Grasberg mine uses a cross section of220o (northwest) with the effect of a 0.02g seismic factor which is the maximum criterionaccording to the probability of slope failure received with the average FK 1.13 and PK 0%.