May/June 2022 - 91

FEATURE ARTICLE
Cone Penetration Testing Can Save
Money (and Trouble)
Most traditional foundation designs are
based on soil investigations using
Standard Penetration Testing (SPT),
sometimes combined with static load
testing on sacrificial trial piles. However,
this design approach has two major
shortcomings. First, SPT data do not
provide direct and continuous information
about soil resistance as a function of
depth. Second and more important,
because of the relatively wide spacing
between borehole locations, SPT soil
investigations do not provide adequate
information about variability of soil
profile and/or soil resistance over the
project area. Preliminary pile load
testing on an SPT location can compensate
for the first disadvantage but cannot
address the second disadvantage. A
design approach based on an adequate
soil investigation campaign with Cone
Penetration (CPT) can overcome both
disadvantages.
This article highlights a case study
that illustrates the advantages of using
CPT for foundation design, as well as for
adjusting the design to unexpected
variations of subsoil conditions.
Cone Penetration Testing (CPT)
During a Cone Penetration Test a cone
with standardized dimensions is pushed
into the soil at a prescribed penetration
speed using rods. During penetration the
cone tip resistance and sleeve friction
are continuously recorded.
The first development of CPT took
place in the 1930s at the Dutch national
institute for soil mechanics. The first
CPT rigs consisted of steel frames that
were fixed to the ground with dead
weight or reaction anchors, with the
AUTHORS Rob van Dorp, M.Sc., Allnamics Geotechnical & Pile Testing Experts
DEEP FOUNDATIONS * MAY/JUNE 2022 * 91
rod mechanically driven into the
ground by manpower. Nowadays, the
rod is pushed into the ground with a
hydraulic system, often mounted on a
heavy truck (that may even be fitted
with tracks for soft terrains) with the
Ancient CPT rig

May/June 2022

Table of Contents for the Digital Edition of May/June 2022

TOC
May/June 2022 - Intro
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