DESIGN OF THE LAND RECLAMATION AND SEA DEFENCE AT TANGERANG INTERNATIONAL CITY ISLAND 1
ISNAINI SETIYOWATI, Teuku Faisal Fathani, ST., MT., Ph.D.
2013 | Skripsi | TEKNIK SIPIL-
Jakarta nowadays has become dense city, with density: 1451 population/ km2. This project tries to help Jakarta’s government to solve the density problem by expanding the Jakarta’s area. Land reclamation is the process of creating new island to expand the area from the ocean. PT.Kapuk Naga Indah was initiated the land reclamation in 1994, and has reclaimed several island. The project was continued in 2005 by PT. Tangerang International City to reclaim TIC Island 1. Due to the regulation of spatial planning, the sand in Java Sea is unable to be dredged again. Consequently, the lack of readily available suitable and good sand for reclamation became an issue. An alternative fill material that suitable for land reclamation as sandfill replacement desired to be found. The research methods start by collecting the soil profile which is generated by borehole data. This research focus to investigate the alternative fills material, from geotechnical perspective. The alternative fill materials are; Clayfill, Solid Waste, Strengthened Sediment. Solid waste needs special treatment and preparatory works to be done before it can be used as fill material, it has to be incinerated and compacted to become ready as fill material. Strengthened sediment is a new useful fill material, before the dredged material can be readily used, it has to be sieved to remove the unwanted materials, and to be mixed with the binder (cement or fly ash). From those alternative materials, the settlement analyses for polder section have been done using D-Settlement software from Deltares, with the combination of Terzaghi, Boussinesq and NEN-Bjerrum models. This research also tried to figure out the most optimized dike profile, with settlement and stability analyses for 34 dike profile. The stability analyses in this research have been done using D-GeoStability with the Simplified Bishop models. As a result, the residual settlement of clayfill=0.278m; solid waste=0.341m; strengthened sediment=0.195m. It can be concluded that all of the alternative materials have fulfilled the requirements, for residual settlement have to be less than 0.5m. It means all the alternative fill material with its construction sequences is applicable. The fill material that will be chosen after all depends to the client necessity. From those three alternative materials, it is preferable to use the strengthened sediment as land fill material. It has the lesser residual settlement and the fastest construction time. It also fulfilled the aim of this research to reduce the amount of sand needed. It is easy to be applied. The probability of environmental effect is not as big as solid waste fill material. Eventhough it has the highest cost, the advantages from the strengthened sediment are worth for the high cost. The most optimized alternative dike’s design is the profile number 12B with serviceability safety factor is 1.60; it also fulfilled the construction safety factor of 1.24.
Kata Kunci : : land reclamation, alternative fill material, solid waste, clayfill, strengthened sediment, dike.
