| dc.description.abstract | ABSTRACT
The research investigated the consolidation behavior of soft clay
after subjected to a surcharge load, included the comparison of residual
settlements and the secondary compression. Besides, the plastic board
drain accelerate the consolidation of clay were also investigated here.
Finally, the results of laboratory experiments were compared with the
settlement monitoring results of indoor pit test.
The test reveals that as the magnitude of simulated surcharge stress
increases, the time interval following removal of the surcharge load
during which little secondary compression occurs also increases, and
when secondary compression reappears, the coefficient of secondary
compression Cα decreases. For most practical purposes a constant Cα
with time can be used to compute secondary compression settlements.
Postsurcharge secondary compression index, Cα¢, always increases with
time. A secant postsurcharge secondary compression index, Cα², is
therefore introduced for a simple computation of secondary compression
settlements.
In the indoor pit test, the pit were divided into two zones, with or
without installing plastic board drain, which compared the consolidation
behavior accelerated by plastic board drain on soft clay. After 450 days
settlement monitoring work, removed the 0.5m of surcharge fills and left
the 1m of fills which were considered as the permanent load. Then, the
settlement monitoring work were continued, and no apparent settlement
occurred. The test results indicated that the values between laboratory
experimental results and the indoor pit test results made few differences. | en_US |