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Cone withdrawn &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