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Subsurface Investigation

Subsurface Investigation. Building structure system. FIELD TESTING. Soil Boring Machine. Flight Auger system Wash Boring. Rotary Drilling. Undisturbed Machine Require. Wash Boring. Rotary Drilling Percussion Drilling. Thin wall (Shelby tube). Split Sampler. Sampling.

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Subsurface Investigation

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  1. Subsurface Investigation Building structure system

  2. FIELD TESTING

  3. Soil Boring Machine • Flight Auger system • Wash Boring

  4. Rotary Drilling • Undisturbed • Machine Require

  5. Wash Boring • Rotary Drilling • Percussion Drilling

  6. Thin wall (Shelby tube) Split Sampler Sampling

  7. Standard Penetration test

  8. Field Testing Standard Penetration Test (SPT) ASTM D1586 –140 lb (63.5 kg)- Falling 30 inches (0.76 cm) Test in 3 interval @ 150 mm Use only the 2 last 2 interval =150x2 =300 mm = 1 ft The unit is Blow per foot

  9. Interpretation • Classify soil to be clay or sand • C for clay • f for sand • Calcuate the strength parameter -Correction for SPT -Calculate the strength parameter

  10. Strength parameter for sand (Peck’s Approach) • No effective stress calculation • Empirically correlation

  11. Parry (1977) Adjustment with overburden pressure

  12. Correction for N-value according overburden pressure

  13. Correlation qu vs N (Sambhandharaksa, 1985)

  14. Strength parameter for clay Procedure for classify soil • Start with water content and unit weight • Check strength parameter with index properties • Divide soil layer

  15. Soil Boring • Number of Boring • Depth of boring Thailand Depth of Boring is 30 or 60 m.

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