Determining the Unconfined Compressive Strength of Cohesive Soil - Soil Properties: Testing, Measurement, and Evaluation - page 330

[B] Compression Data

6,000

(1) Proving ring calibration lb/in.

Applied Load per Unit Area

Elapsed Deformation Cross-Sectional Proving Axial

Time Dial, H Unit Strain, Area, A Ring Dial Load, P

(min.) (in.) (in./in.) (in. 2 ) (in.) (lb) lb/in. 2 lb/ft 2

(6) (5)

(6)
(4)

H
H 0

A 0
1

(1) (2) (3) (4) (5) proving ring (7) (8) (7) 144

calibration

0 0.000 0.000 4.91 0.0000 0 0 0

0.025 0.004 4.93 0.0024 14.4 2.92 420

0.050 0.008 4.95 0.0058 34.8 7.03 1,012

0.075 0.013 4.97 0.0086 51.6 10.38 1,495

0.100 0.017 4.99 0.0116 69.6 13.95 2,009

0.125 0.021 5.02 0.0150 90.0 17.93 2,582

0.150 0.025 5.04 0.0176 105.6 20.95 3,017

0.175 0.029 5.06 0.0208 124.8 24.66 3,551

0.200 0.033 5.08 0.0224 134.4 26.46 3,810

0.225 0.038 5.10 0.0232 139.2 27.29 3,930

0.240 0.040 5.11 0.0224 134.4 26.30 3,787

8.25 0.260 0.043 5.13 0.0198 118.8 23.16 3,335

Strain Rate 0.52 %/min

lb/ft 2

Unconfined compressive strength, q u

3,930

i.e., q u
2

lb/ft 2

Cohesion, c a b 1,965

330