| Summary: | 碩士 === 國立台灣工業技術學院 === 營建工程技術研究所 === 85 === A series of CK0U true triaxial tests have been carried out at
various stress paths to study the mechanical behavior of
remolded Taipei silty clay ,with or without grout column
modification. Test results indicate that the Young''s moduli in
vertical direction for soils with or without grout column
modification decrease with increasing strain at small
strain(<1%) when the major principal stress rotate from vertical
to horizontal direction.However, if the strain increases beyond
1%, then the Young''s moduli will approach a steady value for
both soils.In comparison, no such phenomenon is obversed for the
Young''s modulus in horizontal direction. In other words, the
anisotropic behavior is more significant in vertical direction.
If the major principal stress is in horizontal direction
(lateral loading), the effect of grout column on increasing soil
stiffness becomes obvious only at small strain. Otherwise, no
noticeable difference in soil stiffness can be observed if the
strain becomes larger. If soil is laterally loaded with flexible
boundary condition, a 4 to 5% improvement ratio is needed to
mobilize the influence of grout column in incerasing the
undrained shear strength of soil.
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