In its natural state the soil in a borrow pit, the total (moist) unit weight is 120 lb/ft³, and the water (moisture) content is 20 %. The result of the Modified compaction test of the soil of the borrow pit is given in the figure below. The soil from the borrow pit will be used to construct a compacted fill. The construction of the fill requires 10,000 ft³ of compacted soil. The specifications required that the compaction of the fill be performed at the optimum moisture content to obtain the maximum dry unit weight for fill. How much (volume in ft³) must be excavated from the borrow pit?

In its natural state the soil in a borrow pit, the total (moist) unit weight is 120 lb/ft³, and the water (moisture) content is 20 %. The result of the Modified compaction test of the soil of the borrow pit is given in the figure below. The soil from the borrow pit will be used to construct a compacted fill. The construction of the fill requires 10,000 ft³ of compacted soil. The specifications required that the compaction of the fill be performed at the optimum moisture content to obtain the maximum dry unit weight for fill. How much (volume in ft³) must be excavated from the borrow pit?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Soil Compaction Test

Soil compaction is the major area of geotechnical engineering. Soil is composed of multiple pores present on its surface, while the soil is mainly composed of gravel, sand, rocks, etc. The arrangement of these rocks and gravels is such that they build up voids (spaces) between them, which allows spaces for the roots of the plants and crops to spread and absorb the required amount of nutrients. Soil compaction is a major problem primarily caused by human activities, micro-organisms, and other multiple factors.

Question

In its natural state the soil in a borrow pit, the total (moist) unit weight is 120 lb/ft³,
and the water (moisture) content is 20 %. The result of the Modified compaction
test of the soil of the borrow pit is given in the figure below. The soil from the
borrow pit will be used to construct a compacted fill. The construction of the fill
requires 10,000 ft³ of compacted soil. The specifications required that the
compaction of the fill be performed at the optimum moisture content to obtain the
maximum dry unit weight for fill. How much (volume in ft³) must be excavated
from the borrow pit?
Dry unit weight (lb/ft³)
107
106
105
104
103
102
8
12
w (%)
16
20
24

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