Rock Mechanics Studies During Continuous Miner Bases Coal Pillar Extraction in Indian Coalfields

0447888 - ÚGN 2016 RIV IN eng J - Journal Article
Ram, S. - Kumar, D. - Koníček, Petr - Singh, A. K. - Kumar, R. - Singh, A. Kr. - Singh, R.
Rock Mechanics Studies During Continuous Miner Bases Coal Pillar Extraction in Indian Coalfields.
Transactions. Roč. 111, April 2014-March 2015 (2015), s. 89-104. ISSN 0254-8003
Institutional support: RVO:68145535
Keywords : mining * mechanized depillaring scenario * rock mechanics
Subject RIV: DH - Mining, incl. Coal Mining

Indian coal mining industry has introduced a number of fully mechanized depillaring operations/faces at depth of cover ranging from 60 m to 377 m. Nature of overlying strata of these depillaring faces varied widely; from highly laminated, weak and easily caveable to massive, strong and difficult to cave. These mechanized depillaring operations are, generally, carried out at difficult site conditions but performance monitoring in field showed good production, productivity and safety results. Application of roof bolts as breaker line support for this technology worked well for moderate overlying roof strata but experienced difficulties for, both, extremely weak and strong/massive overlying roof strata. It is observed that the performance of a breaker line support at the goaf edge deteriorated with an increase in depth of cover of the depillaring face. Practice of a straight line of extraction (single row of pillars) during the mechanized depillaring below competent roof strata experienced considerably large hanging area inside the goaf, which needs to be managed either by induced caving of the roof strata or through an increase in width of the excavation.
Permanent Link: http://hdl.handle.net/11104/0249635