a)What are the typical permeability values for clay and sand, respectively? Discuss howthe pore pressure in these soils would respond to loading, make use of schematicdrawings when needed.b)A sample of silty clay is compacted into a mould 150 mm in diameter and 120 mm high.The mass of soil is 3.527 kg which reduces to 2.594 kg after drying in an oven. Calculatethe bulk unit weight of the soil sample. Assuming the specific gravity of the soil grains,Gs = 2.72, calculate the degree of saturation and voids ratio of the soll.c)A site investigation is carried out in Northampton Square for a proposed five storeybuilding. The ground is found to comprise 2 m of coarse gravel overlying London Clay.The gravel has a Gs = 2.65 and a specific volume of 1.573. The clay has a bulk unit weight= 17.9 kN/m³ and a coefficient of earth pressure, Ko= 1.1. The water table is at a depthof 2 m below the ground surface (i.e. level with the top of the London Clay strata).Calculate the vertical effective stress and horizontal total stress at 4 m depth.d)Subsequently the proposed building is constructed including a 2 m deep basement.Assuming that the total vertical stress exerted by the structure on the ground is50 kN/m², calculate the vertical effective and horizontal total stress at 4 m depth afterconstruction is finished.

The permeability or coefficient of permeability can be defined as the rate of flow of water through…

Answered: a) What are the typical permeability…

a) What are the typical permeability values for clay and sand, respectively? Discuss how the pore pressure in these soils would respond to loading, make use of schematic drawings when needed.

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

a)
What are the typical permeability values for clay and sand, respectively? Discuss how
the pore pressure in these soils would respond to loading, make use of schematic
drawings when needed.
b)
A sample of silty clay is compacted into a mould 150 mm in diameter and 120 mm high.
The mass of soil is 3.527 kg which reduces to 2.594 kg after drying in an oven. Calculate
the bulk unit weight of the soil sample. Assuming the specific gravity of the soil grains,
Gs = 2.72, calculate the degree of saturation and voids ratio of the soll.
c)
A site investigation is carried out in Northampton Square for a proposed five storey
building. The ground is found to comprise 2 m of coarse gravel overlying London Clay.
The gravel has a Gs = 2.65 and a specific volume of 1.573. The clay has a bulk unit weight
= 17.9 kN/m³ and a coefficient of earth pressure, Ko= 1.1. The water table is at a depth
of 2 m below the ground surface (i.e. level with the top of the London Clay strata).
Calculate the vertical effective stress and horizontal total stress at 4 m depth.
d)
Subsequently the proposed building is constructed including a 2 m deep basement.
Assuming that the total vertical stress exerted by the structure on the ground is
50 kN/m², calculate the vertical effective and horizontal total stress at 4 m depth after
construction is finished.

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