Diapositiva 1

PILE POINT

ASSIGNMENT 2

CAPACITY

SEMINAR ON FOUNDATION ENGINEERING

RAMIREZ RYAN

201383554

THE PROBLEM

The point of a pile of L = 25 m is founded into a dense medium-coarse sand deposit, which has an average = 30 in the zone of influence of about 1.5 m above the tip to 3 m below. The pile is an HP 360 x 174 with d x b = 361 x 378 mm. The GWT is 5 m below the ground surface.

Estimate the point capacity using the Terzaghi, Meyerhof and N-number methods.

Soil 1

(Sand)

5 m

18.5 m

1.5 m

25 m

3 m

Soil 2

(Dense sand)

HP

THE SOLUTION

is the ultimate pile tip capacity

is the area of pile point effective in bearing (i.e. generally include any plug)

is the ultimate bearing capacity (i.e. Terzaghi bearing capacity equation)

Terzaghi (1943)

where,

For

Shape factors; (for square footing)

From Table 12.1, Fundamentals of Geotechnical Engineering, 3rd ed. B.M. Das

THE SOLUTION

is the ultimate pile tip capacity

is the area of pile point effective in bearing (i.e. generally include any plug)

is the statistical average of the SPT numbers in a zone of about 8B above to 3B below the pile point.

is the width or diameter of pile point

is the pile penetration depth into point-bearing stratum

Meyerhof (1956, 1976)

where,

Thus,

SUMMARY

MethodTerzaghi (1943)1,399.782Meyerhof (1956, 1976)858.947

Table 2.1 Estimated pile point capacity

THANK YOU

ASSIGNMENT 2

RAMIREZ RYAN

201383554

SEMINAR ON FOUNDATION ENGINEERING