Field and Simulation Studies for Mechanised Depillaring below Incompetent Geological Formations of an Indian Coal Mine
Authors
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Council of Scientific and Industrial Research-Central Institute of Mining and Fuel Research (CSIR-CIMFR), Barwa Road, Dhanbad - 826 001
Arun Kumar Singh -
Council of Scientific and Industrial Research-Central Institute of Mining and Fuel Research (CSIR-CIMFR), Barwa Road, Dhanbad - 826 001
Ashok Kumar
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Indian Institute of Technology (Indian School of Mines), Police Line Road, Hirapur, Dhanbad - 826 004
Dheeraj Kumar
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School of Mines and Metallurgy, Kazi Nazrul University, Asansol - 713 340, West Bengal
Rajendra Singh
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Council of Scientific and Industrial Research-Central Institute of Mining and Fuel Research (CSIR-CIMFR), Barwa Road, Dhanbad - 826 001
Sahendra Ram
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Council of Scientific and Industrial Research-Central Institute of Mining and Fuel Research (CSIR-CIMFR), Barwa Road, Dhanbad - 826 001
Rakesh Kumar
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Council of Scientific and Industrial Research-Central Institute of Mining and Fuel Research (CSIR-CIMFR), Barwa Road, Dhanbad - 826 001
Amit Kumar Singh
DOI:
https://doi.org/10.1007/s12594-021-1698-yKeywords:
No keywords.Abstract
A fully mechanised mining method using continuous miner (CM) for pillar extraction in single-pass is introduced in the year 2010 at Pinoura Mine of South Eastern Coalfields Limited, Bilaspur in India. Overall mining cycle time is reduced by singlepass pillar extraction as it does not require drivage of split galleries in pillars and support installation for such galleries. Further, inherent technical abilities of the deployed CM for faster cutting and quad-bolter for supporting, helped in faster recovery of pillars without creating any strata control issues. Rate of face advance varied between 5-15m/day with an average of 8m/day. Field observations found that CM based single-pass extraction is capable in dealing with the strata control issues during depillaring under weak and laminated (incompetent in nature) roof layers having rock mass rating value around 42. A total of eleven panels, have been depillared under the weak and laminated geology, ranging depth of cover from 59 to 149m in different panels of the mine. During field investigations in these panels, a maximum of 2.89MPa induced vertical stress is recorded and influence of caved roof over underground mining structures is observed up to 15m in the outbye from the goaf edge. This paper deals with estimation of snook size and limiting roof movement value based on numerical simulation and field studies during the single-pass extraction below the incompetent geological formations.
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