Problem 1: The table below present the results of a standard proctor test of a borrow pit soil. Mass of wet soil +Mould in 3.69 3.75 3.82 3.92 3.98 3.93 (kg) Water content (%) 6.2 8 9.8 11.5 12.4 13.3 The volume and the mass of the mould was 1000cm and 2 kg, respectively. The specific gravity of the soil is 2.72, determine the following : a) Plot the compaction curve of this soil. b) Optimum water content c) Maximum dry density.

Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
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Chapter4: Plasticity And Structure Of Soil
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Problem 1:
The table below present the results of a standard proctor test of a borrow pit soil.
Mass of wet soil +Mould in
3.69
3.75
3.82
3.92
3.98
3.93
(kg)
Water content (%)
6.2
8
9.8
11.5
12.4
13.3
The volume and the mass of the mould was 1000cm³ and 2 kg, respectively. The specific gravity
of the soil is 2.72,
determine the following :
a) Plot the compaction curve of this soil.
b) Optimum water content
c) Maximum dry density.
d) Plot the zero air void line.
e) Determine the degree of saturation at the maximum dry density.
Problem 2:
The above borrow pit soil has a natural bulk unit weight of 14.5 kN/m³ and water content of
4.5%. An embankment is to be constructed using this soil and the specification require the fill to
be compacted to 96% of the above proctor compaction. Determine the cost for 50,000 m³ of the
embankment considering the following:
a) The distance between the borrow pit and the embankment is 55 km
b) The cost of transporting 1 m of the borrow pit soil to the site is 16 OMR/km.
c) The cost of compaction is 8 OMR/m³.
Transcribed Image Text:Problem 1: The table below present the results of a standard proctor test of a borrow pit soil. Mass of wet soil +Mould in 3.69 3.75 3.82 3.92 3.98 3.93 (kg) Water content (%) 6.2 8 9.8 11.5 12.4 13.3 The volume and the mass of the mould was 1000cm³ and 2 kg, respectively. The specific gravity of the soil is 2.72, determine the following : a) Plot the compaction curve of this soil. b) Optimum water content c) Maximum dry density. d) Plot the zero air void line. e) Determine the degree of saturation at the maximum dry density. Problem 2: The above borrow pit soil has a natural bulk unit weight of 14.5 kN/m³ and water content of 4.5%. An embankment is to be constructed using this soil and the specification require the fill to be compacted to 96% of the above proctor compaction. Determine the cost for 50,000 m³ of the embankment considering the following: a) The distance between the borrow pit and the embankment is 55 km b) The cost of transporting 1 m of the borrow pit soil to the site is 16 OMR/km. c) The cost of compaction is 8 OMR/m³.
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