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Principles of Geotechnical Enginee...

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

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

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

Refer to Problem 3.22. Given that the borrow pit soil has a moisture content of 11% and Gs = 2.7, determine

a. Moist unit weight of the borrow soil

b. Degree of saturation of the borrow soil

c. Moist unit weight of the compacted backfill

3.22 Refer to Figure 3.14. After the construction of a concrete retaining wall, backfill material from a nearby borrow pit was brought into the excavation behind the wall and compacted to a final void ratio of 0.8. Given that the soil in the borrow pit has void ratio of 1.1, determine the volume of borrow material needed to construct 1 m3 of compacted backfill.

images

Figure 3.14

(a)

To determine

Calculate the moist unit weight of the borrow soil.

Explanation

Given information:

The void ratio of compacted backfill (ebackfill) is 0.8.

The void ratio of borrow pit (eborrow) is 1.1.

The volume of compacted backfill (V) is 1m3.

The specific gravity of soil solids (Gs) is 2.7.

The moisture content of borrow pit soil (w) is 11%.

Calculation:

Consider the unit weight of water (γw) is 9.81kN/m3.

Calculate the moist unit weight of the borrow soil (γborrow) using the relation.

γborrow=(1+w)Gsγw1+eborrow

Substitute 11% for w, 2

(b)

To determine

Calculate the degree of saturation of the borrow soil.

(c)

To determine

Calculate the moist unit weight of the compacted backfill.

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