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Geotechnical engineering proceedings lecture

Event organised by ICE

22 November 2022

This event has now ended


Rainfall-induced slope failures are commonly observed in residual soils during rainy seasons. Numerous residual soil slopes are generally unsaturated because of the commonly deep groundwater table. The unsaturated soil zone is greatly affected by environmental changes. Therefore, the rainfall-induced slope failure mechanism and its preventive measures can be better understood using unsaturated soil mechanics and unsaturated soil properties which will become the emphasis of this lecture.

The event will explore how incorporating unsaturated soil properties in such a map will result in more reliable assessments of the regional stability of slopes under rainfall. Research findings and case studies will be used to explain how a susceptibility map is made possible through regional seepage analysis and 3D slope stability assessment.  Many selected residual soil slopes with past failure history were analysed to evaluate the slope susceptibility map and further details will be discussed in the lecture.


18:30 - 18:35

Chairs welcome

18:35 - 19:30

Keynote from Professor Harianto Rahardjo

19:30 - 19:55


19:55 - 20:00

Closing remarks


Event close


Professor David Toll

Professor David Toll

Durham University


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Professor David Toll

David Toll is a Professor in the Department of Engineering and Co-Director of the Institute of Hazard, Risk and Resilience at Durham University. He is a Fellow of ICE and a Fellow of the Learned Society of Wales. He has been Chair of Technical Committees of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) and the Federation of International Geo-Engineering Societies (FedIGS). He has also been Chair of ICE North East and the Northern Geotechnical Group. He has been carrying out research into climate resilience of infrastructure and information technology applied to civil engineering for 30+ years and has published over 200 papers and 12 books.

Professor Harianto Rahardjo

Professor Harianto Rahardjo

School of Civil and Environmental Engineering, Nanyang Technological University


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Professor Harianto Rahardjo

Professor Rahardjo has conducted extensive research on unsaturated soil mechanics to solve geotechnical problems associated with tropical residual soils. His research focus has been on rainfall-induced landslides; one of the major natural disasters occurring in many parts of the world.

He has applied unsaturated soil mechanics principles to better understand the mechanisms of rainfall-induced slope failures especially in tropical residual soils. These research activities have led to the development of an advanced unsaturated soil mechanics laboratory at Nanyang Technological University and numerous comprehensive instrumented slopes. Professor Rahardjo and his team have developed the Capillary Barrier System (CBS) for slope stabilization, GeoBarrier System (GBS) for a cover system and a retaining structure, Slope Management and Susceptibility Geographical Information System for Singapore. In addition, Professor Rahardjo has also applied unsaturated soil mechanics to soil improvement for tree stability, understanding the effects of rainfall on tree stability and developed instruments for tree inclinometer with the associated analytics. Professor Rahardjo is currently developing Advanced Moisture Sensing Technology for Urban Greenery and Monitoring of Slope Stability.

Professor Rahardjo is the co-author of the first textbook on unsaturated soils “Soil Mechanics for Unsaturated Soils“, by D.G. Fredlund and H. Rahardjo, published by John Wiley in 1993, the second textbook “Unsaturated Soil Mechanics in Engineering Practice”, by D.G. Fredlund, H. Rahardjo and M.D. Fredlund, published by John Wiley in 2012 and over 400 technical publications. He has also presented his research works in numerous keynote / invited lectures and short courses in various countries.

He has received several awards : Singapore International Chamber of Commerce Awards (2021) on Most Sustainable Collaboration on GBS, Korean Geotechnical Society (KGS) Awards Lecture (2019), Minister for National Development’s R&D Awards (2017) on Slope Stabilisation using Mangrove based on Unsaturated Soil Mechanics Principles, ISSMGE TC106 Award (2015) for the “Inaugural Asia-Pacific Distinguished Lecture on Unsaturated Soils”, ASTM International Award (2006) for “Outstanding Article on the Practice of Geotechnical Testing”. He holds a patent on GeoBarrier System (GBS).

He is a registered Professional Engineer in Saskatchewan, Canada and Singapore. He has also served as a consultant on various projects for several engineering firms and government institutions in Southeast Asia, Hong Kong, China, Canada, and Australia.