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The cone penetration test is becoming increasingly
more popular as an in-situ test for site investigation and
geotechnical design. However, the interpretation of CPT data
is various in different area, and there are few empirical
equations in Taiwan. In addition, the cone penetration
resistance is effected by layer interface of soil, so that
the characteristics of fine sand profile can not be detected
accurately, but acoustic cone penetration test(ACPT) can improve
this defect because of it*s sensitivity. This research
is hope to establish our own empirical equations of cone
penetration tests with Mai-Liao sand, and discuss the
correlation between sand parameter and acoustic characteristics
by using ACPT in a calibrationchamber.
When refer to all results obtained, the following conclusions
can be achieved: (1) The relative
friction angle is effected by particle size, but it is
constant for the same sand. (2) The increasing rate
of cone penetration resistance is decreases with increasing
vertical stress. (3) The relationship between cone
penetration resistance, relative density and vertical
stress can be unique if correlated with the average grain
size. (4) It is possible that the frequency
distribution of the acoustic signal is depended only on
mineralogy of sand and surface texture of cone tip.
(5) RMS sound pressure which between 2kHz and 8kHz is
decreases with increasing relative density and cone
penetration resistance, but increases with increasing
average grain size. (6) The
ratio of spectrum density of predominant frequency to
secondary frequency is increases with increasing relative
density.
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