Page 425 - Rock Mechanics For Underground Mining

PROBLEMS

pillar, where is the pillar stiffness in the post-peak regime. For various width/height
ratios, in situ tests produced the following results:
Width/height ratio 1.0 1.33 1.85 2.14
/ −0.60 −0.43 −0.29 −0.23

Analysis of convergence at the pillar position for distributed normal loads, P,of
various magnitudes applied at the pillar position, yielded the following results:
P(MN) 0.0 125.0 220.0 314.0
−3
Convergence (m × 10 ) 32.0 22.0 14.0 6.0
Assess the stability of the pillar.

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