Rib/snook design in mechanised depillaring of rectangular/square pillars
International Journal of Rock Mechanics and Mining Sciences
Copyright © 2016 Elsevier Inc. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Reason for embargo
A field study at different mechanised depillaring (MD) operations in Indian coalfields (with depth ranging from 60 to 377 m and caveability Index variation from 2300 to 10500) found mixed performances of adopted sizes of the ribs/snooks. Formation of an irregular shaped rib/snook during MD of the existing square/rectangular pillars by a continuous miner and uniqueness of the existing geo-mining conditions limit scope of application of the conventional rib/snook design approaches. Taking guidance from the field studies, a parametric investigation is conducted in laboratory on the calibrated simulated models using FLAC3D. An analysis of stress redistribution for different stages of the MD in simulated models provided a different characteristic of an irregular shaped ribs/snooks failure. Presence of moderate roof strata is found to be, relatively, more significant for the rib/snook design. Based on the simulation results, an attempt is made to provide a model for the rib/snook design in MD
This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.
Vol. 84, pp. 119–129