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. Sampling Thin wall (Shelby tube) Split Sampler

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  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 q u 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.