Soil properties calculator

Ultimate Geotechnical Soil Properties Calculator

Index & Physical Properties

Mass of moist soil (W, grams):
Mass of dry soil (Ws, grams):
Volume of soil sample (V, cm³):
Specific gravity (Gs): 2.65-2.75
Unit weight of water (γw, kN/m³):

Atterberg Limits & Clay Activity

Liquid Limit (LL, %):
Plastic Limit (PL, %):
Shrinkage Limit (SL, %):
Natural Moisture Content (MC, %):
Clay content (%, < 0.002mm):

Compaction & Density Parameters

Test Type: Standard Proctor (IS 2720-7) Modified Proctor (IS 2720-8)
Maximum Dry Density (γd,max, kN/m³):
Optimum Moisture Content (OMC, %):
Field Dry Density (γd,field, kN/m³):
Field Moisture Content (%):
Max Void Ratio (emax): for relative density
Min Void Ratio (emin): for relative density

Shear Strength & Permeability

Cohesion (c, kPa):
Angle of Internal Friction (φ, degrees):
Normal Stress (σ, kPa):
Coefficient of Permeability (k, m/s):
Hydraulic Gradient (i):
CBR Value (%):

Bearing Capacity Analysis

Foundation Type: Strip Footing Square Footing Circular Footing
Foundation Width/Diameter (B, m):
Foundation Depth (Df, m):
Soil Unit Weight (γ, kN/m³):
Cohesion (c, kPa):
Friction Angle (φ, degrees):
Factor of Safety:

Settlement Analysis

Settlement Type: Immediate Settlement Primary Consolidation Secondary Consolidation
Applied Stress (Δσ, kPa):
Clay Layer Thickness (H, m):
Initial Effective Stress (σ'o, kPa):
Compression Index (Cc):
Initial Void Ratio (eo):
Elastic Modulus (E, MPa): for immediate

Advanced Engineering Properties

Resilient Modulus (MR, MPa): pavement design
Poisson's Ratio (ν): 0.1-0.5
Unconfined Compressive Strength (qu, kPa):
SPT N-Value (N60): standard penetration
Undrained Shear Strength (Su, kPa):
Preconsolidation Pressure (σ'p, kPa):

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Comprehensive Formula Reference

Index: w=(W-Ws)/Ws×100%, e=Vv/Vs, n=e/(1+e)×100%, S=w×Gs/e×100%
Atterberg: PI=LL-PL, LI=(MC-PL)/PI, Activity=PI/Clay%
Compaction: RC=γd,field/γd,max×100%, Dr=(emax-e)/(emax-emin)×100%
Bearing: qu=cNc+γDfNq+0.5γBNγ (Terzaghi), qa=qu/FOS
Settlement: Sc=CcH/(1+eo)×log[(σ'o+Δσ)/σ'o], Si=qB(1-ν²)/E
Advanced: MR=σd/εr, OCR=σ'p/σ'o, Su≈qu/2
Standards: IS 2720 (All Parts), IS 6403, IS 8009, ASTM D698/D1557