   Chapter 11, Problem 11.12P Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

Solutions

Chapter
Section Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

An undisturbed clay has a preconsolidation pressure of 1.9 ton/ft2 at a void ratio of 1.1. Laboratory consolidation test yields the following data: a. Determine the void ratio that corresponds to a pressure 6 ton/ft2. b. What would be the void ratio at a pressure of 1.5 ton/ft2? Given: C s = 1 5 C c .

(a)

To determine

Calculate the void ratio that corresponds to a pressure 6ton/ft2.

Explanation

Given information:

The preconsolidation pressure (σc) is 1.9ton/ft2.

The void ratio of clay (e) is 1.1.

The void ratio (e1) is 0.98.

The void ratio (e2) is 0.84.

The pressure (σ1) is 2.1ton/ft2.

The pressure (σ2) is 4.2ton/ft2.

The pressure (σ3) is 6ton/ft2.

Calculation:

Calculate the compression index (CC) using the relation.

CC=e1e2log(σ2σ1)

Substitute 0.98 for e1, 0.84 for e2, 2.1ton/ft2 for σ1, and 4

(b)

To determine

Calculate the void ratio at a pressure of 1.5ton/ft2.

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