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.
Rock anchors
are used primarily for resisting
uplift forces. On the contrary, Rock
Sockets
serve following three main purposes:
(i)Rock socket provide friction and end bearing
to
resist vertical load;
(ii)Passive resistance of rock sockets
contributes to resistance to lateral loads; and
(iii)Socket shaft friction is also used for
resisting uplifting forces. But only 70% of this capacity should be
used
because of the effect of negative Poisson ratio.
Note:
Rock
anchors, which may consist of a high tensile bar or a stranded cable,
are
provided for tension piles when there are insufficient soil cover to
develop
the required uplifting resistance.
Reference:200
Questions and
Answers on Practical Civil Engineering Works by
Vincent Chu
