A conventional triaxial compression test was conducted on a sample of dense sand from

Ft. Peck Dam, Montana. The initial area of the test specimen was 10 cm2 and its initial height was 70 mm. Initial void ratio was 0.605. The following data were observed during shear. First, calculate the average area of the specimen, assuming it is a right circular cylinder at all times during the test. Then make the calculations necessary to plot the axial stress versus axial strain and volumetric-strain-versus-axial-strain curves for this test. Assuming c' = 0, what is ∅'?

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Strain Dial Time Chamber Buret (giving AH) Axial Load Elapsed Pressure (giving AV) (10-³ in.) kPa (psi) (Ibf) sec mm 2.00 206.8 5.08 (200) (205) (210) (224) (240) (278) (319) (359) (402) (508) (603) (0) (41) (84) (144) (177) (207) (218) (221) (218) (202) (183) (30) 5.21 1.91 182 5.33 5.69 6.10 1.86 374 45 1.92 641 2.13 787 921 90 7.06 2.80 3.66 4.56 970 983 8.10 9.12 5.40 7.30 240 10.21 12.90 15.32 970 898 460 8.09 814