Environmental Engineering Reference
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P
Shear
cracks
FIGURE 3.38
Uniaxial compression test.
P
Unconfined compressive strength (tsf)
6.8
680
0.68
68
6800
Very soft soil
Soft soil
Firm soil
Minimum strength
envelope
Stiff soil
Hard soil
Very soft rock
Soft rock
Hard rock
Rock defined at 100 psi
Very hard rock
Extremely hard
rock
1.0
100
10,000
10
1000
100,000
Unconfined compressive strength (psi)
FIGURE 3.39
Relationship between “consistency” and U c (100 psi
689.5 kN/m 2 ). (After Jennings, J. E.,
Proceedings of ASCE, 13th Symposium on Rock Mechanics, University of Illinois, Urbana, 1972, pp. 269-302.)
6.8 kg/cm 2
 
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