Chapter 3, Problem 3.24P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Refer to the 15-ft high embankment shown in Figure 3.8. Embankments are generally constructed in several lifts or layers that are compacted according to geotechnical specifications. Each lift thickness is 3 ft and must have a dry unit weight of 118 lb/ft^{3}. It is known that the soil at the borrow pit has a moist unit weight of 111 lb/ft^{3}, moisture content of 23%, and *G _{s}* = 2.67. Perform the following tasks.

**a.** Determine the moist weight of borrow soil needed to construct the first lift (bottom layer) per ft of the embankment.

**b.** On the day of the construction, there was a heavy rain that caused the borrow pit to reach a near saturated condition. Recalculate the moist weight of the borrow soil needed to construct the first lift.

**Figure 3.8**

(a)

To determine

Calculate the moist weight of borrow soil needed to construct the first lift per ft of the embankment.

Explanation

**Given information:**

The height of the embankment

The width of the embankment

The thickness of each lift

The dry unit weight

The moist unit weight

The specific gravity of soil solids

The moisture content of borrow pit soil

The relation between the plane is

**Calculation:**

Calculate the dry unit weight of the borrow pit

Substitute *w* and

Calculate the volume of the first lift as shown below.

Substitute 25 ft for *b* and 3 ft for *t*.

Calculate the volume of borrow soils using the relation

(b)

To determine

Calculate the moist weight of borrow soil needed to construct the first lift after heavy rain.

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