A driven pipe pile with an outside diameter of 450mm and a wall thickness of 7mm, 18 m long, is proposed to support columns of a large multi-storey apartment building. The water table is located at a depth of 5m below the ground surface. The soil properties are given in Table below. Depth (m) Soil Type 0-10m 10+ Silty Clay Clay Undrained Friction Cohesion angle (kPa) 30 100 0 0 Saturated Unit Weight kN/m³ 18.0 19.6 Bulk Unit weight kN/m³ 17.2 17 Using the applicable method (a or 3 method) a) Calculate the end bearing capacity b) Calculate the skin resistance c) Estimate the net allowable pile capacity (FS=2) d) Based on your calculations state whether this pile is a 'friction pile' or an 'end bearing pile'.

A driven pipe pile with an outside diameter of 450mm and a wall thickness of 7mm, 18 m long, is proposed to support columns of a large multi-storey apartment building. The water table is located at a depth of 5m below the ground surface. The soil properties are given in Table below. Depth (m) Soil Type 0-10m 10+ Silty Clay Clay Undrained Friction Cohesion angle (kPa) 30 100 0 0 Saturated Unit Weight kN/m³ 18.0 19.6 Bulk Unit weight kN/m³ 17.2 17 Using the applicable method (a or 3 method) a) Calculate the end bearing capacity b) Calculate the skin resistance c) Estimate the net allowable pile capacity (FS=2) d) Based on your calculations state whether this pile is a 'friction pile' or an 'end bearing pile'.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

A driven pipe pile with an outside diameter of 450mm and a wall thickness of 7mm, 18 m long, is proposed to
support columns of a large multi-storey apartment building.
The water table is located at a depth of 5m below the ground surface.
The soil properties are given in Table below.
Depth (m) Soil Type
0-10m
10+
Silty Clay
Clay
Undrained Friction
Cohesion
angle
(kPa)
30
100
0
0
Saturated
Unit Weight
kN/m³
18.0
19.6
Bulk Unit
weight
kN/m³
17.2
17
Using the applicable method (a or 3 method)
a) Calculate the end bearing capacity
b) Calculate the skin resistance
c) Estimate the net allowable pile capacity (FS=2)
d) Based on your calculations state whether this pile is a 'friction pile' or an 'end bearing pile'.

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Step 1: Given Data

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Step 2: End bearing capacity (Qp)

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Step 3: Skin Resistance (Qs)

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Step 4: Skin resistance table

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Step 5: Net allowable pile capacity & type of pile

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