Chapter 9, Problem 9.4P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Consider the soil profile in Problem 9.2. What is the change in effective stress at point *C* if:

**a.** the water table drops by 2 m?

**b.** the water table rises to the surface up to point *A*?

**c.** the water level rises 3 m above point *A* due to flooding?

**Figure 9.25**

(a)

To determine

Find the change in effective stress *C* when the water table drops by 2 m.

Explanation

Given information:

The thickness

The thickness

The thickness

The void ratio (*e*) of soil in the first layer is 0.7.

The specific gravity

The void ratio (*e*) of soil in the second layer is 0.55.

The depth (*h*) of water table drop is 2 m.

Calculation:

Determine the dry unit weight

Here,

Take the unit weight of the water as

Substitute 2.69 for *e*.

Determine the dry unit weight

Substitute 2.7 for *e*.

Determine the saturated unit weight

Substitute *e*.

Calculate the total stress at point *C* (13 m) using the relation.

Substitute

Calculate the pore water pressure at point *C* (13 m) using the relation.

Substitute

(b)

To determine

The change in effective stress *C* when the water rises to the surface up to point *A*.

(c)

To determine

Find the change in effective stress *C* when the water level rises 3 m above point *A* due to flooding.

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