How to classify soil using Unified Soil Classification System (USCS)

In this Geotechnical Engineering tutorial, we walk through the process of classifying different soil types—from coarse-grained to fine-grained—using the Unified Soil Classification System (USCS) chart. Whether you are a Civil Engineering student or a practicing professional, this video simplifies the complex logic of the Atterberg Limits and Sieve Analysis results.
📥 Download the USCS Classification Chart: drive.google.com/file/d/1_jyYcSEtYy1kmwr6QKIqnQ…
In this video, we cover: ✅ How to use the USCS Plasticity Chart ✅ Identifying Liquid Limit (LL) and Plasticity Index (PI) ✅ Calculating the "A-Line" boundary for Silts and Clays ✅ Three practical examples of different soil classifications
0:00 - Introduction to USCS Soil Classification 0:45 - Key Parameters: Grain Size & Plasticity 2:15 - Example 1: Classifying Coarse-Grained Soil 5:30 - Example 2: Fine-Grained Soil & The A-Line 8:45 - Example 3: Dual Symbols and Borderline Cases 11:20 - Summary and Pro-Tips for Exams

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This video explains how to classify four different soils using the Unified Soil Classification System (USCS). There are four soils to be classified in this video. Soil 1 0:01:41 Soil 2 0:03:50 Soil 3 0:05:55 Soil 4: 0:08:33. First two soils (Soil 1 and Soil 2) are coarse-grained soils and also non-plastic. We will classify them based on their gradation, which means that we will need to determine the coefficient of curvature and coefficient of uniformity. Soil 3 and Soil 4 are plastic soils, we are required to classify them based on their plasticity, using the plasticity chart youtu.be/sGt8ZIldsVA
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Relevant videos:
How to Classify soil using AASHTO Classification System: Plastic Soils youtu.be/coVJhUy2Zy4
How to classify soil using AASHTO Classification System: Coarse-Grained soils youtu.be/iwv3Z6yoUjw
AASHTO Soil Classification of Coarse-Grained soils: Step-by-Step Procedure youtu.be/2-bzdhYOzik
How to Classify Soil using Unified Soil Classification System youtu.be/VQNxhNTslX0