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- W845849143 abstract "The RMR ratings, one by horizontal pre-boring in a tunnel and another by tunnel face mapping, are compared at the fault zone in a tunnel. Generally. the horizontal pre-borings were so effective as to forecast reasonably the supporting patterns after tunnel excavation. But the maximum difference in RMR ratings estimated by two methods was about 50 at a certain section of a tunnel. The differences were analyzed on each parameter of the RMR system: the rating differences were 24 in the condition of discontinuities, 15 in the RQD and 13 in the uniaxial compressive strength of rock. To minimize the gap between RMR by pre-borings and by face mappings, it is necessary to select the horizontal pre-boring location where tunnel stability could be critical and to evaluate in detail the sub-parameters of the condition of discontinuities." @default.
- W845849143 created "2016-06-24" @default.
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- W845849143 date "2005-01-01" @default.
- W845849143 modified "2023-09-23" @default.
- W845849143 title "Comparison of the RMR Ratings by Tunnel Face Mappings and Horizontal Pre-borings at the Fault Zone in a Tunnel" @default.
- W845849143 hasPublicationYear "2005" @default.
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