| Summary: | 碩士 === 國立臺灣大學 === 地質學系 === 85 === The study use simple and multiple regression analysis to
quantify theeffective factors of rock characteristics in
(1)physical propertiws, (2)textures, and (3)mineral composition.
These factors were combined to comparetheir relationship with
wave velocity, uniaxial compression strength and slake
durability of the weak sandstone in Kweichulin Formation and
Shidi Formation at eastern Taipei Basin The physical
properties in this study includes 4 items: (1)water content,(2)
porosity, (3)density, and (4)specific gravity. The analysis
results of study materials demonstrate that the wave velocity
and the uniaxial compressionstrength will decrease when the
water contents increase. When the porosity increase, the wave
velocity, the uniaxial compression strength and the slake
durability will decrease. When the density increase, the wave
velocity, the uniaxial compression strength and the slake
durability will increase. Thereseems no relationship between
specific gravity with these engineering charac-teristics.
The rock textures in this study includes 3 items: (1)grain
packing, (2)grain contact, and (3)grain size. The results of
regression analysis demonstratethat the wave velocity, the
uniaxial compression strength and the slake dura-bility will
decrease when the percentage of straight type of grain contact
increase. When the percentage of concavo-convex type of grain
contact increase,the wave velocity, the uniaxial compression
strength and the slake durability will increase. The results
also demonstrate that these engineering characris-tics will
increase when the grain size decrease. There seems no
relationshipbetween grain packing with these eingineering
characteristics. The minerals composition of this study
mainly include quartz, matrix and rock fragment. Quartz content
is about 50% in average, matrix content is about 30%, and rock
fragment content is about 10%. The results of regression
analysisdemonstarte that the wave velocity, the uniaxial
compression strength and the slake durability will decrease when
the quartz content increase. These results of engineering
characteristics also will increase by following the matrix and
the rock fragment content increase. But the relationships are
not clear in thecharacteristics comparison. Therefore, the
minerals compositioin are not major effect factor to the wave
velocity, the uniaxial compression strength and the slake
durability in the weak sandstone of this study.
|
|---|
