Principles of Foundation Engineering (MindTap Course List)
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 15, Problem 15.1P
To determine

Draw the plot for γd(lb/ft3) versus the liquid limit and identify the zone where the soil is collapsing on saturation.

Expert Solution & Answer
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Explanation of Solution

Given information:

The specific gravity of the loessial soil is Gs=2.72.

The liquid limit of the soil is LL=24.

The dry density of the soil is γd=92.2lb/ft3.

Calculation:

Refer to the Equation (11.5) in the textbook.

Consider the density of water is γw=62.4lb/ft3.

Consider the liquid limit of 10.

Find the natural dry unit weight (γd) using the relation.

γd=Gsγw1+LL100Gs

Substitute Gs=2.72, γw=62.4lb/ft3, and LL=10.

γd=2.72×62.41+10100×2.72=133.434lb/ft3

Tabulate the remaining calculated values as in Table 1.

LLγd(lb/ft3)
10133.434
15120.545
20109.927
25101.029
3093.4626
3586.9508
4081.2874

Table 1

Draw the graph between liquid limit versus the natural dry unit weight as in Figure 1.

Principles of Foundation Engineering (MindTap Course List), Chapter 15, Problem 15.1P

Mark the liquid limit of 24 corresponding to the dry unit weight of 92.2lb/ft3. The point lies below the curve of the liquid limit.

Thus, collapse will occur.

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