The effectiveness of vacuum preloading on eliminate secondary settlement; Case study in summarecon city bandung area's development project

Summarecon City Bandung Area's Development Project is used to use embankment preloading with Prefabricated Vertical Drain (PVD) to improve the soil, but due to weather problems, used another alternative by replacing embankment preloading to vacuum preloading. Vacuum preloading with PVD is only intended for accelerate primary settlement, while secondary settlement still exists. Secondary settlement in this project needs to be paid attention because according to the reality in the field, secondary settlement happened quite large because the soil mix with organic soil. Secondary settlement could cause differential settlement which can damage the infrastructure and make the infrastructure drop until lower than flood water level. So far, there has not been a study about how to eliminate secondary settlement in order to complete that settlement before the infrastructure is built, so that differential settlement does not happen. Therefore, a study about eliminate secondary settlement in order to be completed before the infrastructure is built is needed with remove it along with primary settlement. In this case, secondary settlement is going to be eliminated by adding additional load in the form of embankment preloading. Overall, this study can be a suggestion and consideration for the decision-making of Summarecon on selecting the soil improvement; embankment preloading or vacuum preloading.