Abstract:
A novel approach on the analysis and design methods
and" newly envisaged jacketed stone columns in clay
presented in this thesis. It considers nonlinear
for plain
media is
mechanical
behaviour of the constituent materials as well as compatibility
of deformation amongst these. To characterise the nonlinear
mechanical behaviour of the constituent materials, the hyperbolic
model forwarded by Kondner (1963) was used. The cavity expansion
theory presented by Ladanyi (1963) is used here to formulate the
desired equations for prediction of lateral resistance mobilized
in the clay media. A new suction triaxial test was developed to
characterise the mechanical behaviour of the aggregates which was
proved to be very beneficial especially in case of large size
specimens.
As a part of these studies a literature review is presented to
depict the state of the art as well as to identify the
limitations of the existing design methods. To depict the
applicability of the proposed analysis and design methods,
illustration examples are presented. In the examples, the
constituent materials include stone aggregates, a geogrid jacket
liner and a soft clay from the south-east region of Bangladesh. A
comparative study revealed that the existing methods may lead to
unsafe designs. Moreover, the jacketed column was seen to provide
a considerably stiffer foundation than its plain counterpart.
