As shown in the figure given below, a 5 m thick layer of silty sand overlies a clay layer 3 m in thickness. Below the clay layer, there lies a 4 m thick gravelly sand layer underlain by pervious bedrock. The ground water table is at the ground surface. GWT Silty Sand V." 18 kN/m² V.- 19 kN/m 5m Clay 1.5 m v.- 18 kN/m 3 m Gravelly Sand V. - 20 kN/m 2 m 4 m T'B a) Caleulate the total stress (0), pore water pressure (u) and effective stress (a') at points "A" and "B". Show your work and tabulate the results in the following form. Point A Point B a (kPa) u (kPa) oʻ (kPa) b) If ground water table is lowered by 2 m for foundation excavation purposes, caleulate the total stress, pore water pressure and effective stress at points "A" and "B" (1) immediately after, (H) long time after lowering the water table. Show your work and tabulate the results in the following form.
As shown in the figure given below, a 5 m thick layer of silty sand overlies a clay layer 3 m in thickness. Below the clay layer, there lies a 4 m thick gravelly sand layer underlain by pervious bedrock. The ground water table is at the ground surface. GWT Silty Sand V." 18 kN/m² V.- 19 kN/m 5m Clay 1.5 m v.- 18 kN/m 3 m Gravelly Sand V. - 20 kN/m 2 m 4 m T'B a) Caleulate the total stress (0), pore water pressure (u) and effective stress (a') at points "A" and "B". Show your work and tabulate the results in the following form. Point A Point B a (kPa) u (kPa) oʻ (kPa) b) If ground water table is lowered by 2 m for foundation excavation purposes, caleulate the total stress, pore water pressure and effective stress at points "A" and "B" (1) immediately after, (H) long time after lowering the water table. Show your work and tabulate the results in the following form.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:As shown in the figure given below, a 5 m thick layer of silty sand overlies a clay layer 3 m in
thickness. Below the clay layer, there lies a 4 m thick gravelly sand layer underlain by pervious
bedrock. The ground water table is at the ground surface.
GWT
Silty Sand
5 m
Ya = 18 kN/m³
Ys = 19 kN/m3
Clay
1.5 m
3 m
Ys = 18 kN/m3
x A
Gravelly Sand
Ys = 20 kN/m3
2 m
4 m
x B
WXXX
a) Calculate the total stress (0), pore water pressure (u) and effective stress (o') at points "A"
and “B". Show your work and tabulate the results in the following form.
Point A
Point B
o (kPa)
u (kPa)
o' (kPa)
b) If ground water table is lowered by 2 m for foundation excavation purposes, calculate the
total stress, pore water pressure and effective stress at points "A" and "B" (i) immediately after,
(ii) long time after lowering the water table. Show your work and tabulate the results in the
following form.
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