Table 1 gives data from a standard shearbox(direct shear) test on a sample of 125g of dry sand. The initial dimensions of the sample were 60mm×60mm on plan ×20mm in height. The test was carried out at a constant normal effective stress of 50kPa. Take the specific gravity of the soil grains Gs=2.65. Plot graphs of (a) shear stress r against shear strain y, (b) volumetric strain evol against shear strain y, (c) specific volume o against shear strain 7. (1) Comment on these graphs and estimate the peak and critical state effective angles of friction of the soil. Table 1: Shearbox Data Relative horizontal Upward vertical movement Shear stress t (kPa) displacement x (mm) of shearbox lid y (mm) 0.00 0.000 0.02 0.002 19 0.04 0.008 34 0.06 0.016 43- 0.08 0.026 47 0.20 0.064 56 0.32 0.128 51 0.48 0.192 46 0.64 0.256 41 0.80 0.288 37 0.96 0.320 34 1.12 0.321 33
Table 1 gives data from a standard shearbox(direct shear) test on a sample of 125g of dry sand. The initial dimensions of the sample were 60mm×60mm on plan ×20mm in height. The test was carried out at a constant normal effective stress of 50kPa. Take the specific gravity of the soil grains Gs=2.65. Plot graphs of (a) shear stress r against shear strain y, (b) volumetric strain evol against shear strain y, (c) specific volume o against shear strain 7. (1) Comment on these graphs and estimate the peak and critical state effective angles of friction of the soil. Table 1: Shearbox Data Relative horizontal Upward vertical movement Shear stress t (kPa) displacement x (mm) of shearbox lid y (mm) 0.00 0.000 0.02 0.002 19 0.04 0.008 34 0.06 0.016 43- 0.08 0.026 47 0.20 0.064 56 0.32 0.128 51 0.48 0.192 46 0.64 0.256 41 0.80 0.288 37 0.96 0.320 34 1.12 0.321 33
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Table 1 gives data from a standard shearbox(direct shear) test on a sample of 125g of dry
sand. The initial dimensions of the sample were 60mmx60mm on plan x20mm in height. The
test was camried out at a constant normal effective stress of 50kPa. Take the specific gravity
of the soil grains Gs=2.65. Plot graphs of
(a) shear stress r against shear strain y;
(b) volumetric strain evol against shear strain y;
(c) specific volume v against shear strain y.
(d) Comment on these graphs and estimate the peak and critical state effective angles of
friction of the soil.
Table 1: Shearbox Data
Relative horizontal
displacement x (mm) of shearbox lid y (mm)
Upward vertical movement Shear stress t (kPa)
0.00
0.000
0.02
0.002
19
0.04
0.008
34
0.06
0.016
43-
0.08
0.026
47
0.20
0.064
56
0.32
0.128
51
0.48
0.192
46
0.64
0.256
41
0.80
0.288
37
0.96
0.320
34
1.12
0.321
33
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