3.24 Refer to the 15-ft high embankment shown in Figure 3.8. Embankments aregenerally constructed in several lifts or layers that are compacted accordingto geotechnical specifications. Each lift thickness is 3 ft and must have a dryunit weight of 118 lb/ft. It is known that the soil at the borrow pit has a moistunit weight of 111 lb/ft5, moisture content of 23%, and G, 2.67. Perform thefollowing tasksa. Determine the moist weight of borrow soil needed to construct the firstlift (bottom layer) per ft of the embankmentb. On the day of the construction, there was a heavy rain that caused theborrow pit to reach a near saturated condition. Recalculate the moistweight of the borrow soil needed to construct the first lift 25 ftiV: 2H1V : 2H15 ftFigure 3.8

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Asked Nov 28, 2019
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3.24 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. It is known that the soil at the borrow pit has a moist
unit weight of 111 lb/ft5, moisture content of 23%, and G, 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
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3.24 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. It is known that the soil at the borrow pit has a moist unit weight of 111 lb/ft5, moisture content of 23%, and G, 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

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25 ft
iV: 2H
1V : 2H
15 ft
Figure 3.8
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25 ft iV: 2H 1V : 2H 15 ft Figure 3.8

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Expert Answer

Step 1

Given information:

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Borrow pit Moist density (y) 111 Ib/ft W 23% G 2.67 Embankment = 118 lb/ft Dry density

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Step 2

Calculation of bottom width of embankment

Using similar triangle equation

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A 25 ft iv : 2H iV 2H 15 ft 30 ft. 25 ft. 30 ft. C В L 85 ft ΔΑBC Δαbc ВС АВ bc ab ВС 15 2 1 ВС - 30 ft, L 60+25 L-85 ft

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Step 3

Calculation of top width at 3 f...

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73 Top width at 3 ft height 3 ft X L=85 ft 3 2 1 x 6 Top width 85-12 =73 ft

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