354 Underground excavation instability mechanisms
Block 245 Block 345Block Stability condition Direction
123 falls
124
125 355/64
134 falls
135 slides along intersection of sets 1 and 3 049/54(^145) 355/64
234 195/70
235 falls
245 slides along intersection of sets 2 and 5 268/39
345 falls
stable (block is directed upwards)
slides along line of maximum dip of set 5
slides along line of maximum dip of set 5
slides along line of maximum dip of set 2
Q19.5 Repeat Qs 19.1 and 19.2 for side wall 6 (as illustrated in
Q19.1).
A19.5 Using the same methodology but with an inclined projection, the
following results are obtained.
Inclination of principal elements Inclined projection