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23
0.5 × σ
'
v
.tan
δ
which increases linearly from zero at the top of the pile to
0.5
×
[(18 kN/m
3
20 m)  (9.81 kN/m
3
20 m)]
tan20
°
= 29.81 kPa at the base
Hence
T
= [(0 + 29.81 kPa)
÷
2]
[(
π ×
0.5 m)
20 m] = 468 kN
Stress analysis and interpretation of shearbox test data
Q2.7 A drained shearbox test was carried out on a sample of saturated sand. The normal
effective stress of 41.67 kPa was constant throughout the test, and the initial sample
dimensions were 60 mm
×
60 mm on plan
×
30 mm deep). In the vicinity of the peak shear
stress, the data recorded were:
Shear stress
τ
, kPa
42.5
43.1
42.8
relative horizontal displacement x, mm
0.30
0.40
0.80
upward movement of shearbox lid y, mm
0.05
0.075
0.105
(a) Draw the Mohr circle of stress for the soil sample when the shear stress is a maximum,
stating the assumption that you need to make. Determine
φ
'
peak
, and the orientations of the
planes of maximum stress ratio (
τ
/
σ
')
max
. Draw the Mohr circle of strain increment leading
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This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.
 Fall '11
 StuartChalk
 Analytical Chemistry

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