The ground conditions at a site are as shown in thefigure. The water table at the site which was initially ata depth of 5m below the ground level got permanentlylowered to a depth of 15 m below the ground level dueto pumping of water over a few years. Assume thefollowing dataGL5 mOriginal water table15 m20 mLowered water tableClay soil layer5 m1. unit weight of water = 10KN/m32. unit weight of sand above water table = 18kN/m33. unit weight of sand and clay below the watertable = 20 kN/m³4. coefficient of volume compressibility= 0.25 m?/MNWhat is the change in the effective stress inkN/m? at mid-depth of the clay layer due to thelowering of the water table?

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Answered: The ground conditions at a site figure.…

Engineering

Civil Engineering

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

Problem 1P

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Question

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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