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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

Determine the group symbols for the fine-grained soils given in Problem 5.4 by the Unified soil classification system.

5.4 The sieve analysis of ten soils and the liquid and plastic limits of the fraction passing through the No. 40 sieve are given below. Classify the soils by the AASHTO classification system and give the group index for each soil.

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To determine

Find the group symbols for the fine-grained soils using the Unified soil classification system.

Explanation

Calculation:

Refer Table (5.2), “Unified soil classification system” in the textbook.

According to Table (5.2), soils 1, 2, 3, 5, 8, and 10 are fine grained soils, because their fine fraction (percent passing No. 200 sieve) is greater than 50 %.

Soil 1:

Refer Figure (5.3), “Plasticity chart” in the textbook.

Mark the plasticity index (29 %) and liquid limit (38 %) in the graph, intersection of the lines takes place above U-line.

Refer Table (5.2), “Unified soil classification system” in the textbook.

The plasticity index (29 %) is greater than 7 and plots on or above “A” mine.

Therefore, name the group symbol of the soil as CL.

Thus, the group symbol of soil 1 using the Unified soil classification system is CL_.

Soil 2:

Refer Figure (5.3), “Plasticity chart” in the textbook.

Mark the plasticity index (23 %) and liquid limit (56 %) in the graph, intersection of the lines takes place below “A” line.

Refer Table (5.2), “Unified soil classification system” in the textbook.

The PI plots below “A” line.

Therefore, name the group symbol of the soil as MH.

Thus, the group symbol of soil 2 using the Unified soil classification system is MH_.

Soil 3:

Refer Figure (5.3), “Plasticity chart” in the textbook.

Mark the plasticity index (22 %) and liquid limit (37 %) in the graph, intersection of the lines takes place below “A” line.

Refer Table (5.2), “Unified soil classification system” in the textbook.

The plasticity index (29 %) is greater than 7 and plots on or above “A” mine.

Therefore, name the group symbol of the soil as CL.

Thus, the group symbol of soil 3 using the Unified soil classification system is CL_

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