الفهرس 
ACKNOWLEDGEMENTS AllOnly 14 pages are availabe for public view
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Abstract
II
Micropiles are small in diameters (less than 300 mm) and they used as
underpinning elements to enhance bearing capacity of existing foundations and
prevent excessive settlements. They can also be used as foundations for new
structures and land stabilization.
This study investigates the surface friction of the micropiles by using laboratory
models of the micropiles that were loaded with axial loads while changing the
ratio between the lengths of the micropiles and their diameter (L/d).
For this study, a laboratory device has been prepared to be suitable for the
purpose of the study and according to the specifications and requirements of
design. The soft clay soil is placed in layers according to the practical program
until the thickness of the soft clay layer in Tank.
The micropiles were influenced by external loads in a laboratory system
according to the specifications. The load and DROP were measured throughout the
test period until the collapse occurred. The results were recorded, analyzed,
found and the relationship between them.
from the laboratory tests carried out, axial tension was calculated and
distributed along the micropiles buried inside the soft mud soil to show us in
some cases the extent of negative surface friction on the trunk of the pods.The
laboratory results showed that the presence of negative friction on the surfaces
of the micropiles is almost non-existent and is not noticeable when using
micropiles with small diameters (micropiles). The results also indicated that the
relation of the axial load with the corresponding reduction of the micropiles is
linear.
It is also important to conclude that the surface friction carried by the aortic
strands ranged from 87% to 95% of the total load on the aortic stem, depending
on the ratio of length to diameter (L / d).II
Micropiles are small in diameters (less than 300 mm) and they used as
underpinning elements to enhance bearing capacity of existing foundations and
prevent excessive settlements. They can also be used as foundations for new
structures and land stabilization.
This study investigates the surface friction of the micropiles by using laboratory
models of the micropiles that were loaded with axial loads while changing the
ratio between the lengths of the micropiles and their diameter (L/d).
For this study, a laboratory device has been prepared to be suitable for the
purpose of the study and according to the specifications and requirements of
design. The soft clay soil is placed in layers according to the practical program
until the thickness of the soft clay layer in Tank.
The micropiles were influenced by external loads in a laboratory system
according to the specifications. The load and DROP were measured throughout the
test period until the collapse occurred. The results were recorded, analyzed,
found and the relationship between them.
from the laboratory tests carried out, axial tension was calculated and
distributed along the micropiles buried inside the soft mud soil to show us in
some cases the extent of negative surface friction on the trunk of the pods.The
laboratory results showed that the presence of negative friction on the surfaces
of the micropiles is almost non-existent and is not noticeable when using
micropiles with small diameters (micropiles). The results also indicated that the
relation of the axial load with the corresponding reduction of the micropiles is
linear.
It is also important to conclude that the surface friction carried by the aortic
strands ranged from 87% to 95% of the total load on the aortic stem, depending
on the ratio of length to diameter (L / d).