Details:

Personal Author:
Barton, Nick, PH.D. ;
Description:
When the Q-system was launched in 1974, the name referred to rock mass classification, with focus on tunnel and cavern support selection. Besides empirical design of support, the Q-value, or its normalized value Qc, has been found to correlate with seismic P-wave velocity, with deformation modulus, and with deformation. The Q-system provides temporary or permanent support for road, rail, and mine roadway tunnels and for caverns for various uses. It also gives relative cost and time for tunnel construction for a complete range of rock qualities. There are also indications that Q has captured important elements of the cohesive and frictional strength of rock masses, with Qc resembling the product of rock mass cohesion and rock mass friction coefficient.
Subject:
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NIOSH

Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
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urn:sha256:b4f7c2129834407daa21e3905ec329500ac52b22c35f7fd13ed0991cf77a4633
File Type:

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