4. The following are given for a natural soil deposit: Moist unit weight, = 17.8 kN/m³ Moisture content, = 15 % Gs= 2.7 This soil is to be excavated and transported to a construction site for use in a compacted fill. If the specification calls for the soil to be compacted at least to a dry unit weight of 18.4 kN/m²at the same moisture content of 15%, how many cubic meters of soil from the excavation site are needed to produce 16000 m³ of compacted fill? Total volume of soil to be excavated =

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4. The following are given for a natural soil deposit:
Moist unit weight, = 17.8 kN/m³
Moisture content, = 15 %
Gs= 2.7
This soil is to be excavated and transported to a construction site for use in a compacted fill. If the
specification calls for the soil to be compacted at least to a dry unit weight of 18.4 kN/m³at the same
moisture content of 15%, how many cubic meters of soil from the excavation site are needed to
produce 16000 m² of compacted fill?
Total volume of soil to be excavated =
5. Standard Proctor compaction test results on a sandy clay (35% sand, 55% clay, and 10% silt),
taken from a borrow pit, are given in the following table.
4.2 5.1
16.9 18.1
Water content (%)
7.8
9.2
12
Ya (kN/m³)
19.6
19.5
18.5
The sandy clay in the borrow pit has a porosity of 65% and a water content of 5.2%. A
highway embankment is to be constructed using this soil.
a. Specify the compaction (dry unit weight and water content) to be achieved in the field.
Justify your specification.
b. How many cubic meters of borrow pit soil are needed for 1 cubic meter of highway fill?
c. How much water per unit volume is required to meet the specification?
d. How many truckloads of soil will be required for a 100,000 m3 highway embankment?
Each truck has a load capacity of 22.5 m3 and regulations require a maximum load
capacity of 90%.
Transcribed Image Text:4. The following are given for a natural soil deposit: Moist unit weight, = 17.8 kN/m³ Moisture content, = 15 % Gs= 2.7 This soil is to be excavated and transported to a construction site for use in a compacted fill. If the specification calls for the soil to be compacted at least to a dry unit weight of 18.4 kN/m³at the same moisture content of 15%, how many cubic meters of soil from the excavation site are needed to produce 16000 m² of compacted fill? Total volume of soil to be excavated = 5. Standard Proctor compaction test results on a sandy clay (35% sand, 55% clay, and 10% silt), taken from a borrow pit, are given in the following table. 4.2 5.1 16.9 18.1 Water content (%) 7.8 9.2 12 Ya (kN/m³) 19.6 19.5 18.5 The sandy clay in the borrow pit has a porosity of 65% and a water content of 5.2%. A highway embankment is to be constructed using this soil. a. Specify the compaction (dry unit weight and water content) to be achieved in the field. Justify your specification. b. How many cubic meters of borrow pit soil are needed for 1 cubic meter of highway fill? c. How much water per unit volume is required to meet the specification? d. How many truckloads of soil will be required for a 100,000 m3 highway embankment? Each truck has a load capacity of 22.5 m3 and regulations require a maximum load capacity of 90%.
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