The Behaviour Of Unsaturated Compacted Clay
Under Plane Strain Condition
Author(s)
M. Fauziah & H. R. Nikraz
Abstract
The behaviour of unsaturated soil is quite different from those of saturated soil
because of the influence of suction. Although soils are generally assumed fully
saturated below the groundwater table, they may be semi saturated near the state
of full saturation under certain conditions. The situation of partial saturation may
be caused by several factors, such as variation of water table level due to natural
or manmade processes. This study was undertaken to delineate the effects of soil
water suction on the behaviour of kaolin clay under plane strain condition, as
more geotechnical problems in the field such as slope failure, earth retaining
structures, and shallow foundation basically occur in plane strain conditions
rather than tri axial condition. The biaxial apparatus, which was used in this
study, is a modification of the conventional tri axial apparatus. Cell pressure
from the tri axial compression test and a rigid loading platen are used to apply
the minor (σ3) and major (σ1) principle stresses, respectively, to the clay
specimen. The specimen is mounted inside the device, which fully restrains any
out-of-plane deformation by the use of a pair of rigid perspex wall. The volume
change of the sample was measured by local strain devices and laser sensor
while the water volume change was recorded by a volume gauge. Results from
the tests were compared with the theoretical analysis within the elasto-plastic
critical state model for unsaturated soil.
Keywords: biaxial, partly saturated, matric suction, volume change.
Keywords
biaxial, partly saturated, matric suction, volume change.
Related Book
Other papers in this volume
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