Recent advances in testing and field investigations on stability of flyash as back filling material in opencast mines

DOI

10.2991/rare-16.2016.75How to use a DOI?

Keywords

dump; fly Ash; numerical model; opencast coal mine; slope stability; field investigations; testing.

Abstract

This paper presents the results of laboratory investigation, field geotechnical investigations and numerical analysis for understanding the stability of overburden Material including Fly ash in Jindal power opencast coal Mine, India. Numerical models were used for estimation of stability of the back filling material with varying geometry of layers of fly ash and overburden. It is observed that two types of dumps with alternative layer of only fly ash and overburden material, and overburden mixed with fly ash (25%) are found to be stable with safety factor more than 1.2. Geometry of the stable dump has total height of 120 m, 4 number of decks, individual deck height of 30 m, and slope of each deck as 32°. The dump formed with alternate layer of overburden and mixture of fly ash is found stable with a safety factor of 1.78 for the above geometry. Therefore, the above geometry of the back filling material was recommended for the above mine and field trials were successfully conducted for the first time in India. As a part of reclamation with plantation, top soil of nearly 2 m thick was spread over the dump material in the field. Displacement pattern of the monitoring stations during 2012 to 2014 indicated no significant displacement in the Overburden dumps with fly ash ensuring stability of the dump

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/).

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TY  - CONF
AU  - Jayanthu Singam
PY  - 2016/11
DA  - 2016/11
TI  - Recent advances in testing and field investigations on stability of flyash as back filling material in opencast mines
BT  - Proceedings of the conference on Recent Advances in Rock Engineering (RARE 2016)
PB  - Atlantis Press
SP  - 474
EP  - 479
SN  - 2352-5401
UR  - https://doi.org/10.2991/rare-16.2016.75
DO  - 10.2991/rare-16.2016.75
ID  - Singam2016/11
ER  -