Answered: Describe Correction factor for field…

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

Describe Correction factor for field SPT values.

Expert Solution

Step 1

The field 'N' value must be corrected before the SPT values are used in design charts and empirical correlations.

Step 2

The corrections include:

Correction of dilatancy
Correction of overburden pressure

Step 3

Correction of dilatancy:

Beneath the water table, fine sands and silty fine sands develop pore pressure that is not easily dissipated. The pore pressure raises soil resistance and thus the penetration number (N).

In silty fine sands, Terzaghi and Peck (1967) suggest the following correction when the observed value is N greater than 15.

Step 4

The corrected penetration number is

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