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Problem Set 1

This document outlines 10 problems related to soil properties and analyses. The problems involve determining properties like grain size distribution, uniformity coefficient, coefficient of gradation, dry density, void ratio, porosity, degree of saturation, and moisture content using data from sieve analyses, hydrometer tests, specific gravity, unit weights, and moisture contents. The document provides data and asks students to perform calculations to determine various soil properties.

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Ken Rexnier Cabral
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125 views2 pages

Problem Set 1

This document outlines 10 problems related to soil properties and analyses. The problems involve determining properties like grain size distribution, uniformity coefficient, coefficient of gradation, dry density, void ratio, porosity, degree of saturation, and moisture content using data from sieve analyses, hydrometer tests, specific gravity, unit weights, and moisture contents. The document provides data and asks students to perform calculations to determine various soil properties.

Uploaded by

Ken Rexnier Cabral
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Problem Set 1

1. Following are the results of sieve analysis

a. Determine the percent finer than each sieve size and plot a grain-size distribution curve.
b. Determine D10, D30, and D60 from the grain-size distribution curve.
c. Calculate the uniformity coefficient, Cu.
d. Calculate the coefficient of gradation, Cc.

2. Calculate the uniformity coefficient and the coefficient of gradation of the soil with the following
properties:
D10 = 0.082 mm
D30 = 0.29 mm
D60 = 0.51 mm

3. Repeat problem 1 given the following sieve analysis results:

4. Repeat problem 1 given the following sieve analysis results:


5. In a hydrometer test, the results are as follows: Gs = 2.70, temperature of water = 23℃, and hydrometer
reading = 25 at 60 min after the start of sedimentation. What is the diameter, D, of the smallest-size
particles that have settled beyond the zone of measurement at that time (that is, t = 60 min)?

6. For a given soil, show that:

 
7. The moist mass of 2.8 x 10-3 m3 of soil is 5.53 kg. If the moisture content is 10% and the specific
gravity of soil solids is 2.72, determine the following:
a. Moist density
b. Dry density
c. Void ratio
d. Porosity
e. Degree of saturation
f. Volume occupied by water

8. For a given soil, the following are known: Gs = 2.74, moist unit weight = 19.8 kN/m3, and moisture
content = 16.6%. Determine:
a. Dry unit weight
b. Void ratio
c. Porosity
d. Degree of saturation

9. Refer to Problem 7. Determine the weight of water, in kN, to be added per cubic meter (m3) of soil
for
a. 90% degree of saturation
b. 100% degree of saturation

10. The dry density of a soil is 1750 kg/m3. Given that Gs = 2.66, what is the moisture content of the
soil when it is saturated?

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