2016 Volume 2 Issue 75 Pages 2565-2570
Deep foundation bored piles are normally adopted for the foundation system at Marina Bay area in Singapore. The geological formation in this area is very challenging for the underground construction. Currently, there are numbers of high-rise buildings in this area and would have many more in the future as shown in the government’s Master Plan. Therefore, an effective and innovative method to design the pile foundation safely and environmental friendly has to be developed. In this paper, the author describes the effects of base grouting and deep cement mixing (DCM) on the pile performance at Marina Bay Financial Centre (MBFC). The results show that base grouted piles are well performed in the pile toe movement and mobilised skin friction at the bottom section of the pile. Soil improvement works are usually needed for the deep basement excavation for the earth retaining structure at Marina Bay area and DCM is normally adopted. The thickness various from 5m to 7m and is usually founded in the reclaimed sand or soft marine clay layer. The effects of DCM on the mobilised skin friction of pile cannot be ignored. The effects of construction methods using Bentonite and Polymer are also discussed. Installation of bored piles using bentonite method would be much faster than polymer. However, the bentonite might cause the reduction of shaft skin friction. It has to be taken care to avoid it during construction. A study of the geotechnical design parameters for deep foundation bored piles in various types of soil formations in Singapore is presented. The data would be useful for the practitioners to provide a practical and economical bored piles design.
