Lec 3 - Types of Soil Based on Particle Size | USCS Soil Classification | GATE Civil Engineering

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Welcome to **Civil Tutor – GATE Exam Notes!** In this lecture, we explain **Types of Soil Based on Particle Size and USCS Soil Classification** with clear diagrams, particle-size ranges, important soil symbols, and grading formulas. 📚 **Topics Covered:** 🔹 Types of Soil Based on Particle Size - Clay, Silt, Fine Sand, Medium Sand, and Coarse Sand - Fine Gravel, Coarse Gravel, Cobble, and Boulder - Particle-size ranges in mm and μm 🔹 USCS – Basic Soil Symbols - Gravel (G), Sand (S), Silt (M), Clay (C) - Organic Soil (O) and Peat (Pt) - Well-Graded (W) and Poorly Graded (P) - Low, Intermediate, and High Compressibility (L, I, H) 🔹 Common Combined Soil Symbols - GC, SC, SM, CL, CI - CH, ML, MI, MH, OL, and OI/OH 🔹 Grading of Coarse-Grained Soils - Well-graded and poorly graded gravel - Well-graded and poorly graded sand 🔹 Important Grading Parameters - Uniformity Coefficient (Cu) - Coefficient of Curvature (Cc) - Effective particle sizes: D10, D30, and D60 🎯 **Who Should Watch?** ✅ GATE Civil Engineering aspirants ✅ Geotechnical Engineering students ✅ Civil Engineering undergraduate students ✅ Students preparing for competitive and university examinations Subscribe to **Civil Tutor** for easy explanations, GATE preparation, Soil Mechanics notes, important formulas, and Civil Engineering concepts. 👍 Like | 💬 Comment | 🔔 Subscribe #SoilMechanics #GATECivilEngineering #USCS #SoilClassification #GeotechnicalEngineering #CivilEngineering #CTCivilTutor

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27 October 2026