Page 313 - Engineering Rock Mass Classification_ Tunnelling, Foundations and Landslides
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es under Different Weathering Conditions
ighly Fairly Unweathered Unweathered
weathered weathered rock structure rock structure
structure unfavorable favorable for
ructure favorable for for stability stability
avorable stability 110
or stability 60
50 200
35
130
45 65 100
60 75 90
90 130 150 200
120 150 170 220
120 200 200 330
120 180 200 330
120 180 200 330
330 —
— —
uctures, subjected to instability
