2. Based on the following figure, all layers shown in the figure are fully saturated.The pressure applying from a building to the ground surface is about 900 kPa.Assume Gs = 2.7 for each layer.(a) Determine the effective stress for a soil element at the middle of each layer.(b) Determine the vertical stress increase at the middle of the clay layer under thecenter of the foundation (10 m×20 m).(c) Determine the primary consolidation settlement of the clay layer at the centerof the foundation if the clay is overconsolidated with an OCR=1.5.(d) How long will consolidation settlement take for 50% consolidation to occurin the field if the value of Cy = 10 m²/year.20 m10 m-20 mLightly cemented (calciumcarbonate) sand/gravel17 kN/m20 mClay properties:w = 55%C = 0.4C, = 0.05%3D3 mSoft clay-15 mSand and gravel·w 10%Rock

Since the given question has multi subparts therefore as per guidelines only 1-3 subparts will be…

(a) Determine the effective stress for a soil element at the middle of each layer. (b) Determine the vertical stress increase at the middle of the clay layer under the center of the foundation (10 mx20 m). (c) Determine the primary consolidation settlement of the clay layer at the center of the foundation if the clay is overconsolidated with an OCR=1.5.

(a) Determine the effective stress for a soil element at the middle of each layer. (b) Determine the vertical stress increase at the middle of the clay layer under the center of the foundation (10 mx20 m). (c) Determine the primary consolidation settlement of the clay layer at the center of the foundation if the clay is overconsolidated with an OCR=1.5.

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

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

2. Based on the following figure, all layers shown in the figure are fully saturated.
The pressure applying from a building to the ground surface is about 900 kPa.
Assume Gs = 2.7 for each layer.
(a) Determine the effective stress for a soil element at the middle of each layer.
(b) Determine the vertical stress increase at the middle of the clay layer under the
center of the foundation (10 m×20 m).
(c) Determine the primary consolidation settlement of the clay layer at the center
of the foundation if the clay is overconsolidated with an OCR=1.5.
(d) How long will consolidation settlement take for 50% consolidation to occur
in the field if the value of Cy = 10 m²/year.
20 m
10 m
-20 m
Lightly cemented (calcium
carbonate) sand/gravel
17 kN/m
20 m
Clay properties:
w = 55%
C = 0.4
C, = 0.05
%3D
3 m
Soft clay-
15 m
Sand and gravel·
w 10%
Rock

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