dc.description.abstract | Prefabricated vertical drain (PVD) combined with preloading is
one way to deal with soft soil conditions. The predicted settlement
becomes the first information in designing the surcharge, PVD
configuration and depth, and the time required to complete the
consolidation. Prediction of consolidation settlement that using
one-dimensional theory considerably underestimated the field
settlement along the construction of the surcharge placement
stage. This paper intends to evaluate the completed PVD
preloading construction project. Inclinometer monitoring data
was evaluated to confirm whether the consolidation existed on
preferred clay layers. The parametric study evaluated the root
cause of the gap between prediction settlement and monitoring
data. The root cause analysis continued with a parametric
analysis using back calculations. The back analysis involved
various Cc, Cs, and pc' that play a significant role in soil
settlement. The results show that the conservative value of those
parameters simulated separately could not raise the ultimate
settlement into inner upper and lower bond results. However,
combining those would lead to more accurate predictions that
agree with the ultimate settlement. This parametric analysis result
also confirms that overconfidence in picking soil parameters
could lead to underestimating field settlement. Furthermore,
selecting conservative parameters in consolidation settlement
should avoid a big gap between prediction and field ones and put
construction safe. It was decisive work to be done for further
anticipation during and post-construction. | en_US |