Dilatancy Behavior in Constant Strain Rate Consolidation Test
Abstract: Although the
constant strain rate consolidation (CSRC) test appears to be one of the most
promising types of rapid consolidation test, the time dependency in
stress-strain response such as the secondary compression has not been
sufficiently clarified yet in CSRC test. Subjected to remolded young clay, this
paper shows that a lot of time dependent behavior in the standard consolidation
(SC) and CSRC tests is represented systematically by a simple assumption
concerning the time dependency of dilatancy. In the SC test, at the first stage
of each loading step little dilatancy takes place and dilatancy begins to occur
several minutes after step loading. At the latter of each loading step,
dilatancy occurs proportionally with the logarithm of elapsed time, which is
observed as the secondary compression. In CSRC test, some time period after the
stress state has entered the normally consolidated region, dilatancy tends to
occur rapidly with the increase in stress ratio. Since most of dilatancy has
taken place at the earlier stage of consolidation, little dilatancy occurs at
the latter stage of CSRC process. This tendency makes the specimen stiffer with
the passage of time, and makes the vertical pressure and pore pressure increase
substantially at the last stage of CSRC process. Consideration to such behavior
may be effective to correctly interpret the result of CSRC test.
Author: Berty Sompie
Journal Code: jptsipilgg050007
