Uso da Classificação Geomecânica RMR Relacionado à Estimativa de Auto Sustentação em Mina Subterrânea de Sal

Using the RMR Geomechanical Classification Related to the Stand-Up Time Estimation in an Underground Salt Mine

Abstract

Geomechanical classification in a salt mine (especially a potash mine) is based on the following parameters: position and angle of the stratified layer, thickness of the strata, immediate roof of the excavation, distance to the top of the waste rock layer, depth, orientation of the plough and clay thickness. Because there are few underground salt mines, scientific studies and publications have always been limited, especially those related to geomechanical classifications. The initial study aims to verify if the RMR (Rock Mass Rating) system proposed by Bieniawski (1973) can be adopted to correlate the specific stand-up time in the mine. Using statistical studies, it was observed that the RMR system showed strong correlation with the maximum stable opening time and can be useful in predicting the roof self-support time.