A footing 3.0 x 3.0 m carries a net foundation pressure of 130 kPa at a depth of 1.2 m in a deep deposit of sand of unit weight 16 kN/m³; the water table being well below the surface. The variation of cone resistance (qc) with depth (z ) is as follows: Determine the settlement of the footing using Schmertmann's method. Z (m) 1.2 1.6 2.0 2.4 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4 5.8 6.2 6.6 7.4 8.0 qc 3.2 2.1 2.8 2.3 6.1 5.0 3.6 4.5 3.5 4.0 8.1 6.4 7.6 6.9 13.2 11.7 14.8 (MPa)

A footing 3.0 x 3.0 m carries a net foundation pressure of 130 kPa at a depth of 1.2 m in a deep deposit of sand of unit weight 16 kN/m³; the water table being well below the surface. The variation of cone resistance (qc) with depth (z ) is as follows: Determine the settlement of the footing using Schmertmann's method. Z (m) 1.2 1.6 2.0 2.4 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4 5.8 6.2 6.6 7.4 8.0 qc 3.2 2.1 2.8 2.3 6.1 5.0 3.6 4.5 3.5 4.0 8.1 6.4 7.6 6.9 13.2 11.7 14.8 (MPa)

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Settlement Of Shallow Foundations

Section: Chapter Questions

Problem 9.15P

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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

Solve using eurocode 7, design approach 1, combination 2

A footing 3.0 x 3.0 m carries a net foundation pressure of 130 kPa at a depth of 1.2
m in a deep deposit of sand of unit weight 16 kN/m³; the water table being well below
the surface. The variation of cone resistance (qc) with depth ( z ) is as follows:
Determine the settlement of the footing using Schmertmann's method.
Z
(m)
qc
(MPa)
1.2 1.6 2.0 2.4 2.6 3.0 3.4 3.8 4.2
4.6 5.0 5.4 5.8 6.2 6.6 7.4 8.0
3.2 2.1 2.8 2.3 6.1 5.0 3.6 4.5 3.5 4.0 8.1 6.4 7.6 6.9 13.2 11.7 14.8

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Step 1: Given:

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Step 2: Determine the peak value of strain influence factor at depth 2.7m

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Step 3: Tabulating the values for different layers

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Step 4: Determine the correction factor

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Step 5: determine the settlement of footing

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