STATIC CONE PENETRATION TEST
INTRODUCTION
Cone
Sleeve
Driving force
Procedure
Interpretation of results
CONE (DUTCH CONE)
Base area = 10 cm2
Apex angle = 600
To measure tip resistance
Related to un-drained shear strength
CONE
Diameter = 35.7 < d < 36 (mm)
Cone height = 31 < hc < 31.3 (mm)
Cylindrical extension = 4.5 < he <
5.5 (mm)
CONE (10 cm2)
CONE (15 cm2)
CYLINDRICAL SLEEVE
Area = 150 cm2
Height ~ 13.4 cm
To measure frictional resistance
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Cone withdrawn &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.
CONE PENETROMETER
HAND OPERATED (30kN)
ENGINE OPERATED (200kN)
CPT LOG
hyperlink.pdf
ADVANTAGES DISADVANTAGES
Speed
Economy
Detailed & precise
data
Soil sample not
obtained
Depth limited
Most useful in
coarser,
permeable soils ie:
sands