Chapter 5, Problem 5.9P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Classify the following soils using the Unified soil classification system. Give the group symbols and the group names.

To determine

Find the classification of the given soil using unified soil classification system and give the group symbols and group names.

Explanation

**Calculation:**

For soil 1:

The plasticity index (*PI*) is 21.

Determine the coarse fraction.

Substitute 30 % for percent retained on No.200 sieve in Equation (1).

Determine the gravel fraction.

Substitute 70 % for percent passing No.4 sieve in Equation (2).

Determine the sand fraction using the relation.

Substitute 70 % for percent of coarse fraction 30 % for percent of coarse fraction in Equation (3).

Refer Table 5.2 “Unified soil classification system” and Figure 5.3 “Plasticity chart” in the text book.

The group symbol of the soil can be taken as

Provide the group name of soil as shown below.

The gravel fraction

Refer Figure 5.4 “Flowchart group names for gravelly and sandy soil” in the text book.

Take the group name as clayey sand with gravel for the group of SC and gravel fraction of

Thus, the classification of soil 1 using unified soil classification system is

For soil 2:

The plasticity index (*PI*) is 22.

Determine the coarse fraction as shown below.

Substitute 20 % for percent retained on No.200 sieve in Equation (1).

Determine the gravel fraction as shown below.

Substitute 48 % for percent passing No.4 sieve in Equation (2).

Determine the sand fraction using the relation.

Substitute 80 % for percent of coarse fraction 52 % for percent of coarse fraction in Equation (3).

Refer Table 5.2 “Unified soil classification system” and Figure 5.3 “Plasticity chart” in the text book.

The group symbol of the soil can be taken as

Provide the group name of soil as shown below.

The sand fraction

Refer Figure 5.4 “Flowchart group names for gravelly and sandy soil” in the text book.

Take the group name as clayey gravel with sand for the group of GC and sand fraction of

Thus, the classification of soil 2 using unified soil classification system is

For soil 3:

The plasticity index (*PI*) is 28.

Determine the coarse fraction as shown below.

Substitute 70 % for percent retained on No.200 sieve in Equation (1).

Determine the gravel fraction as shown below.

Substitute 95 % for percent passing No.4 sieve in Equation (2).

Determine the sand fraction using the relation.

Substitute 30 % for percent of coarse fraction 5 % for percent of coarse fraction in Equation (3).

Refer Table 5.2 “Unified soil classification system” in the text book.

The soil is a fine-grained soil.

Refer Table 5.2 “Unified soil classification system” and Figure 5.3 “Plasticity chart” in the text book.

The group symbol of the soil can be taken as

Provide the group name of soil as shown below.

Refer Figure 5.5 “Flowchart group names for inorganic silty and clayey soil” in the text book.

Take the group name as sandy fat clay for the group of CH,

Thus, the classification of soil 3 using unified soil classification system is

For soil 4:

The plasticity index (*PI*) is 19.

Determine the coarse fraction as shown below.

Substitute 82 % for percent retained on No.200 sieve in Equation (1).

Determine the gravel fraction as shown below.

Substitute 100 % for percent passing No.4 sieve in Equation (2).

Determine the sand fraction using the relation.

Substitute 18 % for percent of coarse fraction 0 for percent of coarse fraction in Equation (3).

Refer Table 5.2 “Unified soil classification system” in the text book.

The soil is a fine-grained soil.

The group symbol of the soil can be taken as

Provide the group name of soil as shown below.

Refer Figure 5.5 “Flowchart group names for inorganic silty and clayey soil” in the text book.

Take the group name as lean clay with sand for the group of CL.

Thus, the classification of soil 4 using unified soil classification system is

For soil 5:

The plasticity index (*PI*) is 21.

Determine the coarse fraction as shown below.

Substitute 74 % for percent retained on No.200 sieve in Equation (1).

Determine the gravel fraction as shown below.

Substitute 100 % for percent passing No.4 sieve in Equation (2).

Determine the sand fraction using the relation.

Substitute 26 % for percent of coarse fraction 0 for percent of coarse fraction in Equation (3).

Refer Table 5.2 “Unified soil classification system” in the text book.

The soil is a fine-grained soil.

The group symbol of the soil can be taken as

Provide the group name of soil as shown below.

Refer Figure 5.5 “Flowchart group names for inorganic silty and clayey soil” in the text book.

Take the group name as lean clay with sand for the group of CL.

Thus, the classification of soil 5 using unified soil classification system is

For soil 6:

The plasticity index (*PI*) is 18.

Determine the coarse fraction as shown below.

Substitute 26 % for percent retained on No.200 sieve in Equation (1).

Determine the gravel fraction as shown below.

Substitute 87 % for percent passing No.4 sieve in Equation (2).

Determine the sand fraction using the relation.

Substitute 74 % for percent of coarse fraction 13 % for percent of coarse fraction in Equation (3).

The group symbol of the soil can be taken as

Provide the group name of soil as shown below.

The gravel fraction

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