| Summary: | 碩士 === 國立交通大學 === 土木工程研究所 === 83 === Due to the lack of cohesion,it is difficult to obtainisturbed
samples for sand.In-site testing is often used to determine the
engineering properties for sands.The cone penetration test(cpt)
is a popular in-site test method.However ,as for many other in-
site test methods,we rely on empirical equations to interpret
CPT data.A significant part of these empirical equations came
from laboratory chamber calibration tests.An important drawback
of the calibration chamber is its boundary effects.The lateral
boundary of the sand specimem in a calibration chamber is
either stress controlled or rigid. Neither of these two
boundary conditions can truly duplicate the field conditions
which lies somewhere in between.Correction factors have been
proposed to account for these boundary effects.However,the
validity of the use of correction factors and the mechanisms of
boundary efffects have not been independently verified.The
thesis describes details of making silicone rubber membranes
for the chamber cell,instrumentation and monitoring of the
lateral boundary displacement,system set up and calibration,and
available test results.
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