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NOTES on the CONE PENETROMETER TEST (圆锥贯入仪测试,指出)
GE 441 Advanced Engineering Geology Geotechnics Spring 2004
NOTES on the CONE PENETROMETER TEST
Introduction
The standardized cone-penetrometer test (CPT) involves pushing a 1.41-inch diameter
o o
55 to 60 cone (Figs. 1 thru 3) through the underlying ground at a rate of 1 to 2 cm/sec.
CPT soundings can be very effective in site characterization, especially sites with discrete
stratigraphic horizons or discontinuous lenses. Cone penetrometer testing, or CPT
(ASTM D-3441, adopted in 1974) is a valuable method of assessing subsurface
stratigraphy associated with soft materials, discontinuous lenses, organic materials (peat),
potentially liquefiable materials (silt, sands and granule gravel) and landslides. Cone
rigs can usually penetrate normally consolidated soils and colluvium, but have also been
employed to characterize d weathered Quaternary and Tertiary-age strata. Cemented or
unweathered horizons, such as sandstone, conglomerate or massive volcanic rock can
impede advancement of the probe, but the author has always been able to advance CPT
cones in materials of Tertiary-age sedimentary rocks. The cone is able to delineate even
the smallest (0.64 mm/1/4-inch thick) low strength horizons, easily missed in
conventional (small-diameter) sampling programs. Some examples of CPT electronic
logs are attached, along with hand-drawn lithologic interpretations.
Most of the commercially-available CPT rigs operate electronic friction cone and
piezocone penetrometers, whose testing procedures are outlined in ASTM D-5778,
adopted in 1995. These devices produce a computerized log of tip and sleeve resistance,
the ra
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