The ground conditions at a site figure. The water table at the site which was initially at

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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The ground conditions at a site are as shown in the
figure. The water table at the site which was initially at
a depth of 5m below the ground level got permanently
lowered to a depth of 15 m below the ground level due
to pumping of water over a few years. Assume the
following data
GL
5 m
Original water table
15 m
20 m
Lowered water table
Clay soil layer
5 m
1. unit weight of water = 10KN/m3
2. unit weight of sand above water table = 18
kN/m3
3. unit weight of sand and clay below the water
table = 20 kN/m³
4. coefficient of volume compressibility
= 0.25 m?/MN
What is the change in the effective stress in
kN/m? at mid-depth of the clay layer due to the
lowering of the water table?
Transcribed Image Text:The ground conditions at a site are as shown in the figure. The water table at the site which was initially at a depth of 5m below the ground level got permanently lowered to a depth of 15 m below the ground level due to pumping of water over a few years. Assume the following data GL 5 m Original water table 15 m 20 m Lowered water table Clay soil layer 5 m 1. unit weight of water = 10KN/m3 2. unit weight of sand above water table = 18 kN/m3 3. unit weight of sand and clay below the water table = 20 kN/m³ 4. coefficient of volume compressibility = 0.25 m?/MN What is the change in the effective stress in kN/m? at mid-depth of the clay layer due to the lowering of the water table?
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