Two load tests were conducted at a site - one with a 0.5 msquare test plate and the other with a 1.0 m square testplate. For a settlement of 25 mm, the loads were found to7.be 60 kN and 180 kN, respectively in the two tests. Solvethe allowable bearing pressure of the sand and the loadwhich a square footing of 2 m x 2 m, can carry with thesettlement not exceeding 25 mm.A strip footing of width 2 m is founded at a depth of 2 mbelow the ground surface in a (c - p) soil having a cohesionc = 30 kN/m2 and angle of shearing resistance, p = 35°.%3DThe water table is at a depth of 8 m below ground level.The moist weight of soil above the water table is 17.258.kN/m3.Solve (i) the ultimate bearing capacity of the soil, (ii) the netbearing capacity, and (ii) the net safe bearing pressure andthe load/m for a factor of safety of 3. Use the general shearfailure theory of Terzaghi. For p = 35°, N. = 57.8, Nq =41.4,and Ny = 42.4. A rectangular footing (3mx2m) exerts a pressure of 100kN/m2 on a cohesive soil (Es=5x104 kN/m2 and u= 0.5).5.Solve the immediate settlement at the centre, assuming i)the footing is flexible and ii) the footing is rigid Take If forthe flexible footing is 1.36 and If for rigid footing is 1.06A footing, 2 m square, is founded at a depth of 1.5 m in asand deposit, for which the corrected value of N is 27. Thewater table is at adepth of 2 m from the surface. Solve the6.net allowable bearing pressure, if the permissiblesettlement is 40 mm and a factor of safety of 3 is desiredagainst shear failure.

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A rectangular footing (3mx2m) exerts a pressure of 100 kN/m2 on a cohesive soil (Es35x104kN/m2 and p= 0.5). Solve the immediate settlement at the centre, assuming i) the footing is flexible and ii) the footing is rigid Take If for the flexible footing is 1.36 and If for rigid footing is 1.06

A rectangular footing (3mx2m) exerts a pressure of 100 kN/m2 on a cohesive soil (Es35x104kN/m2 and p= 0.5). Solve the immediate settlement at the centre, assuming i) the footing is flexible and ii) the footing is rigid Take If for the flexible footing is 1.36 and If for rigid footing is 1.06

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

Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.

Question

Two load tests were conducted at a site - one with a 0.5 m
square test plate and the other with a 1.0 m square test
plate. For a settlement of 25 mm, the loads were found to
7.
be 60 kN and 180 kN, respectively in the two tests. Solve
the allowable bearing pressure of the sand and the load
which a square footing of 2 m x 2 m, can carry with the
settlement not exceeding 25 mm.
A strip footing of width 2 m is founded at a depth of 2 m
below the ground surface in a (c - p) soil having a cohesion
c = 30 kN/m2 and angle of shearing resistance, p = 35°.
%3D
The water table is at a depth of 8 m below ground level.
The moist weight of soil above the water table is 17.25
8.
kN/m3.
Solve (i) the ultimate bearing capacity of the soil, (ii) the net
bearing capacity, and (ii) the net safe bearing pressure and
the load/m for a factor of safety of 3. Use the general shear
failure theory of Terzaghi. For p = 35°, N. = 57.8, Nq =41.4,
and Ny = 42.4.

A rectangular footing (3mx2m) exerts a pressure of 100
kN/m2 on a cohesive soil (Es=5x104 kN/m2 and u= 0.5).
5.
Solve the immediate settlement at the centre, assuming i)
the footing is flexible and ii) the footing is rigid Take If for
the flexible footing is 1.36 and If for rigid footing is 1.06
A footing, 2 m square, is founded at a depth of 1.5 m in a
sand deposit, for which the corrected value of N is 27. The
water table is at adepth of 2 m from the surface. Solve the
6.
net allowable bearing pressure, if the permissible
settlement is 40 mm and a factor of safety of 3 is desired
against shear failure.

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