Assume that the void ratio variation with respect to pressure relationship shown in Figure 4(a) is representative of the clay shown in Figure 4(b ). Determine the settlement in the clay layer under the centre of footing. Assume, specific gravity G = 2. 7.

Assume that the void ratio variation with respect to pressure relationship shown in Figure 4(a) is representative of the clay shown in Figure 4(b ). Determine the settlement in the clay layer under the centre of footing. Assume, specific gravity G = 2. 7.

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

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

Assume that the void ratio variation with respect to pressure relationship shown in Figure 4(a)
is representative of the clay shown in Figure 4(b ). Determine the settlement in the clay layer
under the centre of footing. Assume, specific gravity G = 2. 7.

2m
4m
3m
1.5m
1200KN
Sand
Clay
Sand and gravel
Figure 4(b)
4mx4m
Water level
Y-18.3kN/m³
Y 19.2 kN/m³
Y= 19.0 kN/m³

Void ratio
1.1
eo
1.0
0.9
0.8
0.7
10
100
Pressure (kN/m²)
Figure 4(a)
1000

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