Determination of Point of Fixity as per Tomlinson

Project: OT Karimun Trestle pilesDate: 8/2/2012

Pile OD: 800 mmWall thickness: 16 mm

Corrosion: 3 mmSoil type: NC ClayPile type: Partly embedded pile

5.2 m below ground

OD: 794 mmID: 768 mm

t: 13 mmA: 0.03190 m2I: 0.00243 m4

E: 2.05E+08 kN/m2

1) Stiff OC Clay - soil modulus is constant with depth:

30 MN/m3

2) NC Clay and Grannular soils - soil modulus increases linearly with depth:

Point of Fixity, zf

Take k = k1, Terzhaghi's modulus.

Adpoted k1

a) nh values for cohesive soils:

2500 kN/m3 <----INPUT REQ'D

3) For short rigid pile or long elastic pile

Adopted factor 4.0

b) nh values for non-cohesive soils:

Adopted nh

4) For partly embedded pile

Adopted factor 1.8