Sheorey, P. R. (1991) Experiences with application of the NGI classification to coal measures. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstract , 28 (1). pp. 27-33. ISSN 0148-9062

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Given are 44 case studies of coal mine roadways with their classification data and support requirement. The cases, which were originally collected for a new CMRS classification for coal measures, have been used in the paper to test the performance of the NGI system. Changes in the NGI classification are proposed so as to include horizontal stratification, joint orientation or unfavourable horizontal stress and some special geological features. A new support load equation is proposed including roadway span and rock density. Also presented are regression equations between the CMRS classification rating R and the original and modified NGI index Q.

Item Type: Article
Subjects: Bord and Pillar Mining
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 06 Feb 2012 05:25
Last Modified: 06 Feb 2012 05:25

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