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Subsurface Investigation

Subsurface Investigation

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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.