16-10-2017 1 Sub-Soil Investigation by Prof. S. R. Gandhi INFORMATIONS REQUIRED Variations in Ground levels and Site Grading Drainage Pattern Shear strength parameters for baring capacity Compressibility and Consolidation parameters Modulus of Sub-grade reaction Dynamic Soil Parameters Earth Pressure Coefficients Permeability Constant Chemical Analysis of Soil/Ground water
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Sub-Soil Investigation - IIT Gandhinagar · 2017-10-16 · Precautions to be taken •Check straightness of the drill rods •Effective circulation of bentonite slurry •Maintain
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16-10-2017
1
Sub-Soil Investigation
by
Prof. S. R. Gandhi
INFORMATIONS
REQUIRED Variations in Ground levels and Site Grading
Drainage Pattern
Shear strength parameters for baring capacity
Compressibility and Consolidation parameters
Modulus of Sub-grade reaction
Dynamic Soil Parameters
Earth Pressure Coefficients
Permeability Constant
Chemical Analysis of Soil/Ground water
16-10-2017
2
Planning Subsoil Investigation
• Number of Boreholes
• One for each important structure
• Information for every 50m of loaded area
• Borehole for medium size structure only if variations
• Few boreholes for future expansion
• Depth of Boreholes
• 1.5 to 2 times times the width of foundation (beyond