1. Subsurface Investigation Building structure system

4. FIELD TESTING

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

7. Rotary Drilling • Undisturbed • Machine Require

8. Wash Boring • Rotary Drilling • Percussion Drilling

9. Thin wall (Shelby tube) Split Sampler Sampling

11. Standard Penetration test

12. 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

13. 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

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

15. Parry (1977) Adjustment with overburden pressure

16. Correction for N-value according overburden pressure

17. Correlation qu vs N (Sambhandharaksa, 1985)

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

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