| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 85 === The main topics of this thesis study shear strength
characteristics and consolidation behavior of composite soil. As
far as consolidation behavior was concerned, we calculated soil-
relative parameter separately and discussed it depending on
Terzaghi one-dimensional consolidation theory and accommodating
with two different calculating modes, traditional three phase
diagram theory and four phase diagram theory. On the analysis of
traditional three phase diagram, solid didn district the
different grain size of particle. So that when we analyzed
composite soil, it could not expose the non-clay particle having
influence on the soil engineering properties while existing big
grain size.We use four phase diagram to distinct composite soil
as gas, water, clay particle and non-clay particle, in order to
distinguish non-clay particle from clay particle more precisely
and reveal the characteristics of non-clay particle. To
understand the change of particle grain size and gain of the
content that would affect the engineering properties relative to
the complex soil, the thesis included the laterite in the
complex way to be investigated in consolidation test,
permeability test and shear strength test. Futhter, classified
the boundary between sandy soil and clayey soil by the analying
result of four phase diagram and the threshold non-clay void
ratio.Besides, the thesis discuss how the mercury intrusion
porosimeter permeated the composite soil. And by the mercury
intrusion porosimeter we know different content of sand-laterite
mixtures and its pore size distribution. At last, we compared
permeability which predecessor analogized composite soil by PSD
function of mercury intrusion porosimeter with the measure value
of realistic constant-head test.
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