What is the relation
of bearing pressure on soil nail head to the ratio
La/Lb, where La is the length of soil
nail before the potential slip circle while Lb
is the length of soil nail beyond the potential slip circle?
Vincent
T. H. Chu
is renowned internationally as
walking
encyclopedia of civil engineering.
Author of a number of
widely acclaimed
civil engineering books, Mr Chu is recipient of various reputed awards
including Young Engineer of
the Year Award 2008
(Merit) by the Hong
Kong
Institution of Engineers &Ombudsman’s
Award 2007 (under
complaint-related category). He is also listed
in
11th Edition of Marquis Who's
Who in Science and Engineering. ConcreteBasics.org
thanks him for his exemplary contribution to the cause of civil
engineers
around the world.
The unstable
soil mass before the potential circular slip is resisted by two
components:
soil nail head bearing pressure and friction of soil nail in the
unstable soil
mass.
Therefore, the longer is the length
of soil nail before potential slip
circle La, the higher is the proportion of forces being resisted by
frictional
forces and hence the smaller amount is to be resisted by soil nail head.
Hence,
the smaller the ratio La/ Lb, the greater is the resistance provided by
soil
nail head.
Reference:200
Questions and
Answers on Practical Civil Engineering Works by
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