Abstract
Mine closure includes the rehabilitation process, which is a continuous programme aimed at restoring physical, chemical, and biological quality that has been harmed by mining to a level that is acceptable to all individuals involved. BIT Mesra was assigned a R&D project on development of dragline dump profile which includes both on-going and closed mines. As a part of the study, the stability of both highwall and dump was investigated for this mine. The stability of the final quarry batter of this mine was studied considering the formation of Planar, Wedge, and Circular failure. Due to favorable position, inclination and orientation of fault planes, i.e., F2-F2 and other nearby fault planes, the probability of formation of Plane and Wedge failure was minimal. There was no presence of unidentified fault planes intersecting the final quarry batter leading to planar and wedge failure. Hence, circular failure involving minor structural discontinuities was investigated with help of the computerized model based on Fellenius and Bishop’s method. Accordingly final quarry batter was designed with optimum combination of safety and maximum extraction of coal. It has also been ensured that a part of OB dump was back filled on the floor of the exhausted mine in such a way that the final depth is not more than 60 m, for the purpose of rainwater harvesting and pisciculture. This paper deals with design of final quarry bench and discusses various geo-technical parameters for carrying out stability analysis.
Highlights
Balanda opencast mine is located in the south-eastern part of Talcher coalfield in Angul district of Orissa, India and falls under the administrative control of Mahanadi Coalfields Limited (MCL)
In view of the above, MCL (Mahanadi Coalfield Limited) and the management of the Balanda opencast mine conducted a variety of design research and academic institutions to conduct a slope stability analysis of Balanda ocp
This paper presents a geo-technical approach to deal with quarry bench design during mine closure stage based on the study carried out by Birla Institute of Technology, Mesra, Ranchi and Central Mine Planning and Design Institute, Ranchi
Summary
Balanda opencast mine is located in the south-eastern part of Talcher coalfield in Angul district of Orissa, India and falls under the administrative control of Mahanadi Coalfields Limited (MCL). The mine was sanctioned for an annual rated capacity of 1.0 Million ton in 1959 and the project is in operation since . There is only one coal seam dipping at 2°- 4° with thickness as [13,14] metre and overburden rock above coal seam is [65-70] metre. The present working is in western part near dip side lease hold boundary of the mine close to fault F2-F2 (Fig 1 & 2). To delineate the location of fault F2-F2 and geo-technical properties of rock strata, four boreholes were drilled near the present working face (Srivastava, Jha, and Shandilya 2015)
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