A 3 m saturated clay layer is covered by 1 m-thick sand and is underlain by sand as well. The water table is 0.5 m below the ground level, and for vertical stress computations, all layers may be assumed to have unit weights of 18 kN/m³. An oedometer test was performed on an undisturbed clay sample obtained from a depth 1.9 m below the ground level. The initial water content of the clay was 35.7% and the specific gravity of the soil grains was 2.65. The sample thicknesses after 24 hours at each load increment in the consolidation test are summarized: 50 100 18.44 18.03 o'v (kPa) H (mm) 19.05 a. Plot e and my against o'v (log). b. Calculate both the compression index and the recompression index of the clay. c. Is the clay normally consolidated or overconsolidated at the depth where the sample was taken from? Why? 200 17.63 400 17.21 50 17.33

A 3 m saturated clay layer is covered by 1 m-thick sand and is underlain by sand as well. The water table is 0.5 m below the ground level, and for vertical stress computations, all layers may be assumed to have unit weights of 18 kN/m³. An oedometer test was performed on an undisturbed clay sample obtained from a depth 1.9 m below the ground level. The initial water content of the clay was 35.7% and the specific gravity of the soil grains was 2.65. The sample thicknesses after 24 hours at each load increment in the consolidation test are summarized: 50 100 18.44 18.03 o'v (kPa) H (mm) 19.05 a. Plot e and my against o'v (log). b. Calculate both the compression index and the recompression index of the clay. c. Is the clay normally consolidated or overconsolidated at the depth where the sample was taken from? Why? 200 17.63 400 17.21 50 17.33

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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Concept explainers

Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.

Question

A 3 m saturated clay layer is covered by 1 m-thick sand and is underlain by sand as well. The water
table is 0.5 m below the ground level, and for vertical stress computations, all layers may be assumed
to have unit weights of 18 kN/m³. An oedometer test was performed on an undisturbed clay sample
obtained from a depth 1.9 m below the ground level. The initial water content of the clay was 35.7%
and the specific gravity of the soil grains was 2.65. The sample thicknesses after 24 hours at each
load increment in the consolidation test are summarized:
100
18.03
o'v (kPa)
H (mm)
19.05
a. Plot e and my against o'v (log).
b. Calculate both the compression index and the recompression index of the clay.
c. Is the clay normally consolidated or overconsolidated at the depth where the sample was taken
from? Why?
50
18.44
200
17.63
400
17.21
50
17.33

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