A saturated clay layer (300cm in thickness) was sitting upon the rock, its unit weight was = 20kN/m3, an oedometer test also found that Cc = 0.2, Cr = 0.04. The existing vertical effective stressin the field is 200 kPa. Construction will increase the vertical stress at the centre of the clay by = 600 kPa.a) Calculate the primary consolidation settlement of clay layer if it has been subjected toa load at OCR = 2.b) Assume spatial variation of pore pressure u with time t and depth z is onedimensional,and governed by:where Cv is a given constant, specify its boundary and initial condition, and try toillustrate the pore pressure change with time along its depth. A saturated clay layer (300cm in thickness) was sitting upon the rock, its unit weight was y= 20kN/m', an oedometer test also found that Ce = 0.2, C, = 0.04. The existing vertical effective stressin the field is 200 kPa. Construction will increase the vertical stress at the centre of the clay byAo = 600 kPa.a) Calculate the primary consolidation settlement of clay layer if it has been subjected toa load at OCR = 2.b) Assume spatial variation of pore pressure u with time t and depth z is one-dimensional, and governed by:a?uneaz?whereis a given constant, specify its boundary and initial condition, and try toillustrate the pore pressure change with time along its depth.

Given values: Saturated clay layer thickness=300cm unit weight of soil=20kN/m3 Cc=0.2 Cr=0.04…

Answered: A saturated clay layer (300cm in…

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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A saturated clay layer (300cm in thickness) was sitting upon the rock, its unit weight was = 20
kN/m3, an oedometer test also found that Cc = 0.2, Cr = 0.04. The existing vertical effective stress
in the field is 200 kPa. Construction will increase the vertical stress at the centre of the clay by
 = 600 kPa.
a) Calculate the primary consolidation settlement of clay layer if it has been subjected to
a load at OCR = 2.
b) Assume spatial variation of pore pressure u with time t and depth z is onedimensional,
and governed by:
where Cv is a given constant, specify its boundary and initial condition, and try to
illustrate the pore pressure change with time along its depth.

A saturated clay layer (300cm in thickness) was sitting upon the rock, its unit weight was y= 20
kN/m', an oedometer test also found that Ce = 0.2, C, = 0.04. The existing vertical effective stress
in the field is 200 kPa. Construction will increase the vertical stress at the centre of the clay by
Ao = 600 kPa.
a) Calculate the primary consolidation settlement of clay layer if it has been subjected to
a load at OCR = 2.
b) Assume spatial variation of pore pressure u with time t and depth z is one-
dimensional, and governed by:
a?u
ne
az?
where
is a given constant, specify its boundary and initial condition, and try to
illustrate the pore pressure change with time along its depth.

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