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  Challenges and Innovations in the Deepest Underground Space Development in Restricted Urban Areas of Kuala Lumpur

  The Damansara Town Centre (DTC) was constructed in 1983 to 1986. The 9 blocks of 8 to 10 storeys buildings were founded on bored piles and steel H-piles foundations. The site is located in Kuala Lumpur Kenny Hill Formation. The construction of 2 new MRT stations within its vicinity and the rapid development of the surrounding areas have created an urge to redevelop this plot of land of over 3.5ha with over 30 years old buildings inclusive of an existing bridge that need to be demolished. The new development will be a high density mixed development with 5 to 8 levels of basement carparks, 4 levels of podium for commercial, 9 blocks of 8 to 22 storeys office towers and 3 blocks of 48 to 54 storeys of residential towers with total build up area of 300,000m2. The original development has existing retaining wall system of counterfort RC wall and the bored piles and H-piles are approximately 12m to 18m long below soffit of pile cap level. There are 7 MRT viaduct piers located literally next to the eastern boundary for the entire development. These constraints have posted significant challenges to the design and construction sequence of the retaining wall and support system for the basement structure, as well as the foundation systems for the office towers and residential towers. This development also needs to comply with the regulatory requirements of Mass Rapid Transit Corporation due to close proximity, especially on railway protection in-line with the Railway Act and establishment of comprehensive instrumentation monitoring scheme to railway system along with the basement construction works. This paper will present the innovations in overcoming the complex challenges encountered.

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