Pile Capacity

 Date Printed:11/3/2014 Printed:11/3/2014

Page 1

Company: J A C E L t d .

Design Input

DESIGN OF PIL ES BASED ON LOAD CAPACITY 

Tel: 07890 278110

 Address: Turners Yard, School Street, Street, Farsley LEEDS, West Yorks, UK  Project:  Cl  Client:

LS28 5EX

 Ma  Made by

J.J.MAC Element:

 Pa  Page No 1

Date

December 12, 2004

Checked

Revision A

Job No

Value 700

1. Pil Pil e 

Pile type   Boared Shaft Dia. or width 450 mm Base Dia. or width 450 mm Shape   Round Design Load 635 kN 2. Des Design Cr iteri a  gf

(Bearing) gf (Shaft) gf (Overall)

     

2.50 2.50 2.50

600

Load Vs Embedded Length

500

   )    N    k    (    d   a   o    L

400

Ulimate Base Load Ultimate Shaft Load

300

3. Soil 

 Allowable Total Load

Bulk unit weight Depth to water table Starting depth of: Depth increments of: Total Length of Pile:

200

18 kN/m³ 3.00 m 0.80 m 0.50 m 7.30 m

Design Load 100

0 0

1

2

3

4

5

6

7

Depth (m)

4. Computation Computation T able 

Type L=Loose

Critical Friction Depth Coefficient (m) F Undrained Embedmen Adhesion Coefficient Shear t Ratio  i v e  e s i v  C o h Strength (ZL) Non-Cohesive L, L , M, D (m) Su (kN/m²) Cohesive ZL Cohesive 10 0.00 1.00 Cohesive 10 1.11 1.00 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Cohesive 40 7.78 1.00 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30 Non-Cohesive l 2.70 0.30

 i v e M=Mediu  e s i v  - C o h  N o n m D=Dense

Effective Depth L (m) 0 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 6.50

Ultimate Base Pressure

Max Nc

Bearing Capacity Factor Nc Bearing Capacity Factor Nq

b

s

(kPa) 9.000 9.000 18.000 27.000 36.000 45.000 54.000 9.000 62.000 66.000 70.000 74.000 78.000 82.000

(kPa) 6.30 7.68 25.00 25.00 25.00 25.00 25.00 9.00 25.00 25.00 25.00 25.00 25.00 25.00

(kPa) 63.00 76.78 450.00 675.00 900.00 1125.00 1215.00 360.00 1215.00 1215.00 1215.00 1215.00 1215.00 1215.00

(kPa) 10.00 10.00 5.40 8.10 10.80 13.50 14.58 40.00 14.58 14.58 14.58 14.58 14.58 14.58

Vertical Effective Stress

Ultimate Shaft Friction Ultimate Shaft Adhesion

Total Ultimate Ultimate Allowable Base Load Shaft Load Load

b

(kN) 10.02 12.21 71.57 107.35 143.14 178.92 193.24 57.26 193.24 193.24 193.24 193.24 193.24 193.24

s

(kN) 0.00 7.07 10.89 16.61 24.25 33.79 44.09 72.37 82.67 92.98 103.29 113.59 123.90 134.20

No. of  Piles Required

Design Capacity

159 83 20 13 10 8 7 13 6 6 6 6 6 5

(kN) 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN 635 kN

all

(kN) 4.01 7.71 32.98 49.59 66.95 85.08 94.93 51.85 110.36 114.49 118.61 122.73 126.85 130.98

 Note: Greyed cells represent user input  input 

This program considers the following cases: 1. Uniform pile type (bored or driven), 2. One type of soil (cohesive or cohesionless), but properties may vary with depth. It computes the variation of pile capacity with length and size.

 File: 249929731.xls.ms_office 249929731.xls.ms_office Tab: Tab: Calculations Calculations

Load Distribution Distribution Beneath a Rigid Rigid Pile Cap

Non-Cohesive Soils End-bearing qb= 'vbNq Nq=fn(sand & pile types) Sand

z /d l

Loose Medium Dense

6 8 15

Shaft Friction f s 'vbF F=fn(sand & pile Types) Nq Driven 60 100 180

Bored 25 60 100

Sand

z /d l

Loose Medium Dense

6 8 15

F Driven 0.8 1 1.5

Bored 0.3 0.5 0.8

Non-Cohesive Soils End-bearing qb= 'vbNq Nq=fn(sand & pile types) Sand Loose Medium Dense

z /d l 6 8 15

Shaft Friction f s 'vbF F=fn(sand & pile Types) Nq Driven 60 100 180

Sand Bored 25 60 100

Loose Medium Dense

z /d l 6 8 15

Cohesive Soils End-bearing qe=9Su if L/d>4 qe=NcSu if L/d<=4 L/d 0 1 2 3 4

Nc 6.3 7.6 8.3 8.8 9

Shaft Adhesion fs= Su  = fn(Su) su 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

1 1 1 1 1 0.912 0.783 0.702 0.621 0.564 0.516 0.477 0.443 0.413 0.388 0.37 0.354 0.339 0.33

F Driven 0.8 1 1.5

Bored 0.3 0.5 0.8