|
General Interpretation on Natural Void
Ratio-Overburden Pressure Relationship of Marine Deposits
Takashi. Tsuchida
ABSTRACT : Unified model of e-logp
relationship of clays was proposed, which consists of ultimate standard
compression curve, USC and the standard e-logp curves from
the initial void ratio SCe0. Both curves are determined
mainly by the liquid limit, the void ratio at the very beginning of
consolidation and the sensitivity of clay. The uniqueness of USC was
examined by the consolidation data of 18 marine clay. Considering the
effects of waves and currents, the void ratio of marine clay when the
consolidation starts seems to be 1.5-2.0 times of the liquid limit. By
using the proposed model and the assumed initial void ratio, the
interpretation on the natural void ratio of marine deposit seabed is
given. The specific volume index Isv, which is defined
as log (e+1)/log(eL+1), is newly proposed to
normalize the compression curves of clays of different liquid limits. In
Isv-overburden pressure relationship, a unique
standard sedimentation compression curve is obtained based on the SCe0.
As the specific volume index of narural Osaka Bay Pleistocene clay is
much larger than the standard curve, the clays seem to have the
structures due to the aging effects during the sedimentation.
Key words: marine clay, compression, consolidation, void
ratio, water content, diluvial deposit (IGC: B5)
|
