International Conference on Chemical, Civil and Environment engineering (ICCEE'2012) March 24-25, 2012 Dubai

Stability of Fly Ash and Overbuden Material as Back Filling in Opencast Mines –A Case Study

Singam Jayanthu, Sarat K. Das, and Sk. Md. Equeenuddin

Fly ash generates from the coal based thermal power plant is of great concern due to its disposal. Therefore proper utilization of the fly ash is highly demanded. This paper demonstrates the results of laboratory investigation through numerical analysis using PLAXIS for understanding the stability of overburden dump formed by mixing with 25% fly ash in opencast coal mine at Raigarh, India. 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. As a part of reclamation with plantation, top soil of nearly 2 m thick was spread over the dump material in the field.

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