basics of scpt

1. STATIC CONE
PENETRATION TEST

2. INTRODUCTION
 Cone
 Sleeve
 Driving force
 Procedure
 Interpretation of results

3. CONE (DUTCH CONE)
 Base area = 10 cm2
 Apex angle = 600
 To measure tip resistance
 Related to un-drained shear strength

4. CONE
 Diameter = 35.7 < d < 36 (mm)
 Cone height = 31 < hc < 31.3 (mm)
 Cylindrical extension = 4.5 < he <
5.5 (mm)

5. CONE (10 cm2)

6. CONE (15 cm2)

7. CYLINDRICAL SLEEVE
 Area = 150 cm2
 Height ~ 13.4 cm
 To measure frictional resistance

8. PROCEDURE
 Cone pushed @ 10
mm/sec (35 mm)
(Soil Mechanics and Foundation Engg:
Dr:K R Arora)
 Cone withdrawn &
sleeve pushed on to
the cone and driven
together.

9. CONE PENETROMETER

10. HAND OPERATED (30kN)

11. ENGINE OPERATED
(200kN)

12. CPT LOG
 hyperlink.pdf

13. ADVANTAGES DISADVANTAGES
 Speed
 Economy
 Detailed & precise
data
 Soil sample not
obtained
 Depth limited
 Most useful in
coarser,
permeable soils ie:
sands