| Summary: | 碩士 === 國立交通大學 === 土木工程學系 === 84 === This project used Tou-Cheng sand as sand specimens which
were made by air-pluvition method in three different relative
densities, 35%, 55% and 75%. Effective confining pressure was
kept as 1 kgf/cm^2 . The sand was tested with three seismic
loading patterns by torsional shear apparatus and the
liquefaction strengths were defined for 3%, 5% and 10% double
amplitude shear strains in order to find the relationship
between the dynamic strength and seismic loading pattern.
Besides, the liquefaction strength will be compared with the
test results recorded in Yee-Lan area. The test results
show that：(1)different types of loading pattern applied on
specimen result in various dynamic shear strength and
behavior,(2)there is a transformable relationship between
regular and seismic loading pattern, (3)the earthquake peak
ground acceleration causing liquefaction assessed by seismic
torsional shear tests will be smaller than that by the regular
torsional shear tests at the same depth, (4)it was found that
the acceleration ratio against stress ratio is a linear
function.
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