Question

In: Civil Engineering

As indicated in the following figure, an incompressible silty sand fill 16.4 ft thick was placed...

As indicated in the following figure, an incompressible silty sand fill 16.4 ft thick was
placed on top of a 49.2 ft thick layer of soft and compressible silty clay. Underlying the
clay is a layer of incompressible sandy gravel. The soil properties of the silty clay layer are
given in the following figure. The ultimate settlement, Sult = 5.64 ft, from the primary
consolidation of silty clay layer due to the weight of the silty sand fill is calculated.

A) the time rate of settlement by showing the Time [year] vs. Settlement [ft] curve.
Show sample calculation when percentage of consolidation, Uavg = 50% to receive full
credits!

the time rate of settlement by showing the Time [year] vs. Settlement [ft] curve.
Show sample calculation when percentage of consolidation, Uavg = 50% to receive full
credits!
γ = 94.89 pcf
eo = 1.1
Cc = 0.36
Cα= 0.06
cv = 9.235 ft2
/year
Fill Material - Silty Sand
(SM), γ = 124.86 pcf,
Dense Sandy Gravel (GP),
Incompressible layer
16.4 ft
0 ft

Solutions

Expert Solution

U Tv (when U<=60%) Tv (When U>60%) t St
0 0.0000 - 0.00 0.000
5 0.0020 - 0.13 0.282
10 0.0079 - 0.51 0.564
15 0.0177 - 1.16 0.846
20 0.0314 - 2.06 1.128
25 0.0491 - 3.22 1.410
30 0.0707 - 4.63 1.692
35 0.0962 - 6.30 1.974
40 0.1257 - 8.23 2.256
45 0.1590 - 10.42 2.538
50 0.1963 - 12.87 2.820
55 0.2376 - 15.57 3.102
60 0.2827 - 18.53 3.384
65 - 0.3404 22.31 3.666
70 - 0.4028 26.40 3.948
75 - 0.4767 31.24 4.230
80 - 0.5671 37.16 4.512
85 - 0.6837 44.80 4.794
90 - 0.8480 55.57 5.076
92 - 0.9384 61.49 5.189
94 - 1.0550 69.13 5.302
96 1.2193 79.90 5.414
97 1.3358 87.54 5.471
98 1.5001 98.30 5.527
99 1.7810 116.71 5.584

[In the above table Tv for U<60% is calculated using equation (3) and Tv for U> 60% is calculated using equation (4)]


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