Prediction of subsidence for the chromite mine using numerical modelling techniques

摘要

A chromite orebody of Sukinda valley is planned to be extracted with sub-level open stoping method. The chromite orebody of 20 m thick, 290 m strike length and 200 m depth is developed with five stopes of equal size i.e 48.5 m x 20 m and the rib pillars size is 10 m x 20 m considering level interval 50m. This paper describes the method for predicting the subsidence profile for the proposed mining method before commencement of the mining operation with the help of finite element method. The predicted subsidence profile is very much essential in getting the environmental clearance from the government agencies to commence the mining operation. For the prediction of subsidence for the proposed sub-level open stoping method, two dimensional numerical modelling techniques have been adopted to estimate the stress and displacement distributions on the ground surface, around the stope and rib pillar of in situ and excavation models.