Triaxial Compression Test - Soil Properties: Testing, Measurement, and Evaluation - page 362

1

[C] Triaxial Compression Data (Specimen no. )

55.0

(1) Consolidation pressure on test specimen, 3 psi

0.05

(2) Rate of axial strain in./min

6.05

(3) Height of specimen after consolidation, H c in.

6,000

(4) Proving ring calibration lb/in.

Cross- Unit Axial

Elapsed Deformation Axial Sectional Proving Applied Load Pore

Time Dial, H Strain, Area, A Ring Dial Axial Load (Deviator Pressure,

(min) (in.) (in./in.) (in. 2 ) (in.) (lb) Stress) (psi) (psi)

(6) (5)

(6)
(4)

¢ H
H c

A c
1

(1) (2) (3) (4) (5) proving ring (7 ) = (8)

calibration

0 0 0 4.82 0 0 0 0

0.012 0.0020 4.83 0.0021 12.6 2.6 1.5

0.033 0.0055 4.85 0.0152 91.2 18.8 7.1

0.065 0.0107 4.87 0.0205 123.0 25.3 12.9

0.127 0.0210 4.92 0.0267 160.2 32.6 19.5

0.191 0.0316 4.98 0.0314 188.4 37.8 23.4

0.265 0.0438 5.04 0.0345 207.0 41.1 25.0

0.384 0.0635 5.15 0.0374 224.4 43.6 25.8

0.460 0.0760 5.22 0.0398 238.8 45.7 25.8

0.551 0.0911 5.30 0.0402 241.2 45.5 25.8

14.3 0.717 0.1185 5.47 0.0386 231.6 42.3 25.6

55.0

Minor principal stress (i.e., chamber pressure, 3 ) psi

Unit axial load at failure, p 46.0 psi
Major principal stress at failure (i.e., 1 3 p)

101.0

psi

25.8

Pore pressure corresponding to unit axial load at failure, f psi

- 3 [i.e., - 3 f ]

29.2

Effective minor principal stress, psi

- 1 [i.e., 1 f ]

75.2

Effective major principal stress at failure, psi

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