Subsidence management and 3-D analysis at Ukwa underground manganese mine of MOIL Limited

DOI

10.2991/rare-16.2016.53How to use a DOI?

Keywords

Deformation; Manganese; Monitoring; Numerical Modeling; Subsidence

Abstract

Subsidence is a universal process that occurs in response to the voids created by extracting solids or liquids from beneath the Earth surface. The void created by the underground extraction causes significant changes in the magnitude and orientation of the insitu stress field and results in deformations both in the stope and in the surrounding rocks. Deformations in the underground workings eventually reach the ground surface and may form subsidence depressions, open fractures, pits, and troughs. In this context, MOIL has conducted in-house research investigations of the subsidence phenomenon related to the underground mining of manganese ore at Ukwa mine. Considering the ore body and the hanging wall characteristics the subsidence phenomenon would be very much comparable to a coal mine situation. Taking this factor into consideration, the prediction of subsidence parameters has been carried out by adopting the well accepted and conventional coal mining subsidence prediction methods that have been developed in the country and are suitable for Indian mining conditions. The computations showed that the parameters of importance are well within the limit for permissible subsidence in general as well as for forest land. The monitoring is done on a continuous basis at quarterly intervals, at two sites in the forest land above the mine workings at Ukwa Mine. The quarterly monitoring data from October 2014 to March 2016 for both the locations clearly suggests that no noticeable movement took place in any of the three orthogonal directions at these places. This is evidence enough that the subsidence at the Ukwa mine surface land is not of any measurable significance. The paper presents the scientific investigations carried out by the MOIL for prediction of subsidence parameters and successful 3-D analysis of subsidence monitoring at Ukwa Mine

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - G.G. Manekar
AU  - D. Shome
AU  - M.P. Chaudhari
PY  - 2016/11
DA  - 2016/11
TI  - Subsidence management and 3-D analysis at Ukwa underground manganese mine of MOIL Limited
BT  - Proceedings of the conference on Recent Advances in Rock Engineering (RARE 2016)
PB  - Atlantis Press
SP  - 332
EP  - 338
SN  - 2352-5401
UR  - https://doi.org/10.2991/rare-16.2016.53
DO  - 10.2991/rare-16.2016.53
ID  - Manekar2016/11
ER  -