In order to know the area of major fall from its impact parameters I wan to classify data in three categories like Low, Medium, High. The parameters are as follows :
Area of exposure 0-10,000sqm, Depth of cover 0-110 m, RMR 65, Roof cavability -1.5 , Roof convergence - 1.5 m,
Area of Major roof fall 0- 3400 sq m. This classification based to Indian DGMS standards it is helpful.
Roof depends on the combination of factors .You can read the paper of Smith, A. D. and also of Mark & Molinda for your quarry. Hope you will find answer.
1. Mine Roof Condition and the Occurrence of
Roof Falls in Coal Mines
Smith, A. D.
The Ohio Journal of Science. v84, n3 (June, 1984), 133-138
2. The Coal Mine Roof Rating in Mining Engineering
Practice by C. Mark & G. M. Molinda 2003 University of Wollongong
Research Online
However, I would like to mention that one single discontinuity (especially sub-horizotal to horizontal) if not identified during exploration , in rock mass may override all calculations based on general rating.
I Thank you Dr. Indra Prakash, for your answer. Sir I gone through those publications earlier; I failed in understanding the concept due to my Non- Mining background of Graduation. Once again I will go through it and search for my solution. I appreciate your response. Thank you once again.
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