10.1

A saturated soil has a void ratio e = 0.65 and a specific gravity of soil solids G _s = 2.69. The unit weight (saturated) of this soil is most nearly:

1. 16.5 kN/m ³

2. 17.3 kN/m ³

3. 18.1 kN/m ³

4. 19.7 kN/m ³

10.2

Following are the results of a standard Proctor compaction test.

The maximum dry unit weight of the soil is most nearly:

1. 100 lb/ft ³

2. 106 lb/ft ³

3. 112 lb/ft ³

4. 115 lb/ft ³

10.3

The specific gravity of solids, G _s, for a soil is 2.75. The zero-air-void dry unit weight of the soil at a moisture content of 20% is about

1. 17.5 kN/m ³

2. 18.1 kN/m ³

3. 18.9 kN/m ³

4. 19.7 kN/m ³

10.4

A sand layer of the cross-sectional area shown in Exhibit 10.4 has been determined to exist for a 1440-ft length of the levee. The coefficient of permeability of the sand layer is 10 ft/day. The quantity of water which flows into the ditch is most nearly:

Exhibit 10.4

1. 20.2 gal/min

2. 23.4 gal/min

3. 26.2 gal/min

4. 28.4 gal/min

10.5

An earth dam on a pervious but strong earth foundation has the cross section shown in Exhibit 10.5. The core of the dam is sealed from the jointed rock foundation with a thin layer of gunite or slush grout. The seepage through...