Dear colleagues in rock mechanics and engineering geology!
We are developing the RMR-based rock support further and would also like to update Bieniawski's summary figure for stand-up time. We already have data on some projects (we have collected historical mines here as well as natural caves, old and new tunnel projects).
We are asking you to send me information if you have it.
Information needed: project location, the time of the execution (any additional references would be good), how long was the tunnel unsupported (collapsed? or was there any indication?), remained unsupported? What RMR or Q value was typical for the reported underground area?
Thank you in advance!
My email address is [email protected]
RMR and Q-system were developed based on case histories. Both systems have some limitations. In RMR system UCS have been given significant weightage which is lacking in Q-System, but no parameter on active are consider in RMR-system. Further, in Q-system SRF value for construction of multiple tunnels parallel to each other is not assign and UCS has directly less role in calculation of its value.
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