Tan Siew Ann

Associate Professor

Postal Address: Department of Civil and
  Environmental Engineering,
  National University of Singapore
  1 Engineering Drive 2, E1A 07-03
  Singapore 117576
Tel: (65)6516 2278
Email: ceetansa@nus.edu.sg
Office: E1A-05-10


Dr Tan Siew Ann (Harry) is currently an Associate Professor in the Department of Civil and Environmental Engineering. His research work is mainly in Geotechnical Engineering. He is a registered Professional Engineer in Singapore; and has a PE and AC status in Geotechnical Engineering.

Positions Held

Assoc Professor Dept of Civil Engineering 01.08.1998 - 26.09.2010
Senior Lecturer Dept of Civil Engineering 01.01.1989 - 31.07.1998
Lecturer (Scale A) Dept of Civil Engineering 01.04.1985 - 31.12.1988
Senior Tutor Dept of Civil Engineering 27.05.1980 - 31.03.1985

Consultancy Projects

  • Over 100 projects in Singapore and in the region.
  • Served as Chairman of "State Expert Witness Team" for COI on Nicoll Highway Tunnel Collapse in 2004-2005


  • PEng, Civil Engineering, Professional Engineers Board, Singapore, (since 1994)
  • Specialist PE and AC Geotechnical Engineering, PEB, Singapore , (since 2008)
  • PhD, Civil, University of California, Berkeley (USA), (1985)
  • MSc, Civil, University of California, Berkeley (USA), (1982)
  • MEng, Civil, National University of Singapore, (1982)
  • BEng, 1st Hons, Civil, Auckland University, (New Zealand), (1976)

Honours & Awards

  • AY2009/2010 Teaching Commendation
  • AY2007/2008 Teaching Commendation
  • AY2005/2006 Teaching Commendation
  • AY2003/2004 Annual Teaching Excellence Award
  • AY2003/2004 Excellent Teacher Award
  • AY2003/2004 Engineering Educator Award
  • AY2002/2003 Teaching Commendation
  • AY2001/2002 Teaching Commendation
  • AY2000/2001 Teaching Commendation
  • AY1998/1999 Teaching Commendation
  • US Patent 6,367,310 B1, "Drainage testing of porous asphalt road mixes", Date:9 April 2002 [ SA Tan, TF Fwa, CT Chuai]
  • Singapore Patent P-No.67286, "Drainage test apparatus for porous (or drainage) road mixes", Date: 16 Jan 2001 [ SA Tan, TF Fwa, CT Chuai]
  • Singapore Patent PCT/SG99/00022, "Drainage testing of porous asphalt road mixes", Date: 21 Oct 1999 [ SA Tan, TF Fwa, CT Chuai]
  • IES Engineering Achievement Award 2000 for innovation and applications of nondestructive drainage evaluation for expressways, 29 October 2000 [TF Fwa & SA Tan]

Professional Activities

  • Member of ASCE, Member of IES, International Advisory Panel for Plaxis BV
  • Committee member of A2K06 of TRB (US Transportation Research Board, committee on Sub-drainage for Highways and Airport Pavements) [Feb 2003 to present]
  • Core-committee member of TC-9 of the ISSMGE, on Earth Reinforcement [Sep 2002 to 2006]
  • Scientific network committee for development and use of Plaxis BV, in cooperation with TU Delft, Netherlands [Oct 2002 to present]

Editorial Boards

  • Geotextiles and Geomembranes, an official journal of the International Geosynthetics Society, published by Elsevier Science, UK [Jan 1997 to present]
  • Geotechnical Engineering, published by the Southeast Asian Geotechnical Society [1999 to present]

Teaching Areas

  • Earth Retaining Structures
  • Numerical Analysis in Geotechnical Engineering
  • Slope Engineering
  • Site Investigation and Monitoring
  • Groundwater Seepage and Consolidation

Research Interests

  • Numerical Methods and Applications to Geotechnical Problems
  • Deep Excavations
  • Pile Foundations
  • Ground Improvement

Selected Publications

Principal publications of the last five years

  1. Tan, S A, "One North Station Excavation in 30m of Jurong Residual Soils". ASCE Geotechnical Special Publication, 208 (2010): 732 to 739. (United States). (Theme Lecture for ER2010 on Case History Session).
  2. FELLENIUS*, BENGT and S A Tan, "COMBINATION OF O CELL AND HEAD DOWN PILE LOAD TEST". ASCE Geotechnical Special Publication, (2009). (United States). (ASCE/GI Geotechnical Special Publication (GSP) titled: The Art of Foundation Engineering Practice honoring Clyde Baker).
  3. Tan*, S A, P H OOI, TAE SOON PARK and W L CHEANG, "RAPID PULLOUT TEST OF SOIL NAIL". JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 134, no. 9 (September 2008 2009): 1327 1338. (United States). (Paper describes a novel method of dynamic rapid pullout tests for soil nails).
  4. Tan*, S A, S Tjahyono and K.K Oo, "Simplified Plane Strain Modeling of Stone Column Reinforced Ground". JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 134, no. 2 (2008): 185 195. (United States).
  5. Leung*, C F and S A Tan, "Successes and Failures of Instrumentation Programs in Major Construction Projects in Singapore". ASCE Geotechnical Special Publication, 175 (2007).

Last Updated on 24 August, 2012 by Department of Civil and Environmental Enginering