1. Invited lecture on “Green slope engineering: influence of mechanical and hydraulic effects of root architecture on slope stability”. 13th Baltic States Geotechnical Conference, Vilnius, Lithuania, 22-24 Sep. 2016.
  2. Keynote lecture on “Monotonic and Cyclic Shear Stiffness of Unsaturated Soil at Different Temperatures: New Knowledge and Challenges”. The 5th African Young Geotechnical Engineering Conference, Kumasi, Ghana, 9-13 Aug. 2016.
  3. Invited speaker (only one from Asia): NSF sponsored workshop on “Geotechnical Fundamentals in Face of New World Challenges”. Arlington, Virginina, USA, 17-19 Jul. 2016.
  4. Special lecture on “Modelling the effects of strain- and path-dependent soil stiffness on soil-structure interaction problems: an engineer’s perspective”. The 19th Southeast Asia Geotechnical Conference, Kuala Lumpur, Malaysia, 31 May–3 Jun. 2016.
  5. Invited lecture on “Recent advances in geotechnical centrifuge modelling”. The 24th Prague Geotechnical Days 2016, Prague, Czech Republic, 9-10 May 2016.
  6. Distinguished lecture on “Understanding of mechanisms of soil-structure interaction via centrifuge modelling”. The 1st International Conference on Advances in Civil Infrastructure and Construction Materials, Dhaka, 14-15 Dec. 2015.
  7. Keynote lecture on “A new alternative all-weather earthen landfill cover system”. The 1st International Conference on Geo-Energy and Geo-Environment, Hong Kong, 4-5 Dec. 2015.
  8. Keynote lecture on “Performance of energy piles: centrifuge modelling”. The 1st International Conference on Geo-Energy and Geo-Environment, Hong Kong, 4-5 Dec. 2015.
  9. Keynote lecture on “Froude characteristics and runup prediction of granular and water flows”. The 4th Italian Workshop on Landslides, Naples, Italy, 23-25 Nov. 2015.
  10. Invited special lecture: “Monotonic and Cyclic Shear Stiffness of Unsaturated Soil at Different Temperatures”. The 6th Asian-Pacific Conference on Unsaturated Soils (TC106). Guilin, China, 23-26 Oct. 2015.
  11. Keynote lecture on “Climatic effects on groundwater flow, deformation and stress mobilisation of a vegetated volcanic soil slope”. The International Workshop on Volcanic Rocks and Soils, Ischia, Italy, 24-26 Sep. 2015.
  12. Keynote speaker on “Civil Engineering – an outdated first-degree to study?”. The QS Focus Summit – Civil Engineering, NTU, Singapore, 6-8 Jun. 2015.
  13. Panel discussion member at TC308 – “Energy Geotechnics”. The International Symposum on Energy Geotechnics, University of Politecnica de Catalunya (UPC), Barcelona, Spain, 2-4 Jun. 2015
  14. Keynote lectures on “Centrifuge modelling of energy piles in sand and clay” and “A new three-layer landfill cover system for all weather conditions: physical and numerical modelling”. The 3rd Unsaturated Soil Symposium, Hungarian Academy of Sciences, Budapest, Hungary, 5 May 2015.
  15. Keynote lecture on “Deep excavation effects on tunnel”. The 40th Anniversary of Seafco Conference, Bangkok, Thailand, 19th Dec. 2014.
  16. Keynote lecture on “Green foundation”. The XVII Brazilian Conference on Soil Mechanics and Geotechnical Engineering, Goias, Brazil, 9-13 Sep. 2014.
  17. AGM lecture on “Landslide debris and baffles – the interaction mechanisms and case histories”. The 25th Annual General Meeting (AGM) of the Geotechnical Engineering Technical Division of the Institution of Engineers, Kuala Lumpur, Malaysia, 14 Jun. 2014.
  18. Keynote lecture on “Effects of stress relief due to deep excavation and twin tunnelling on the capacity and deformation of floating piles”. The 34th HKIE annual seminar, Hong Kong, 30 May 2014,
  19. Keynote lecture on “Three-dimensional centrifuge and numerical investigation of the performance of piled foundations subjected to deep excavation. International Symposium on Advances in Foundation Engineering (ISAFE2013), Singapore, 5-6 Dec. 2013.
  20. Invited lecture on “Centrifuge modeling of single energy pile in saturated sand”. The International Workshop on Geotechnics and Energy, Lausanne, Switzerland, 26-28 Nov. 2013.
  21. Keynote lecture on “Three-dimensional tunnel-excavation-pile interaction”. The 17th Indonesian National Geotechnical Conference, Jakarta, 13-14 Nov. 2013.
  22. Opening lecture on “Flume modelling of interaction mechanisms between debris flows and baffles”. The 3rd Italian Workshop on Landslides, Naples, Italy, 23-24 Oct. 2013.
  23. Keynote lecture on “Shear stiffness of unsaturated soil under static and cyclic loads at different temperatures”. The 1st National Coference on Unsaturated and Special Soils, Chongging, 12-13 Oct., 2013.
  24. TC Discussion leader (Session 4) for the TC215 Symposium on Coupled Phenomena in Environmental Geotechnics from theoretical to experimental research to practical applications. Politecnico di Torino, Italy, 1-3 Jul. 2013.
  25. Keynote lecture on “Failure mechanisms of loose fill slopes and environmentally friendly stabilization measures in urban city”. The 6th National Academic Conference of Geological Hazard, Beijing, China, 11-12 Apr. 2013.
  26. Plenary speaker on “Future Challenges and Opportunities via Centrifuge Modelling: Research, Design and Forensic Engineering”. The 2nd Int. Conf. on Global Technology Initiative, Mumbai, India, 29-30 Mar. 2013.
  27. Plenary lecture on “Physical and Numerical Modelling of Landslide Debris Mechanisms and the Application of Baffles”. The Conf. on Landslide Risk, Ain Draham, Tunisia, 14-16 Mar. 2013.
  28. Keynote lecture on “Centrifuge modeling in geotechnics: Research, Design and Forensic Engineering”. Indian Geotechnical Conference (IGC-2012), the Indian Institute of Technology, Delhi, India, 13-15 Dec. 2012.
  29. Keynote lecture on “Stiffness anisotropy and resilient modulus of an unsaturated soil under static and cyclic loads”. The 2nd International Conference on Geotechnique, Construction Materials and Environment (GEOMAT2012), Kuala Lumpur, Malaysia, 14-16 Nov. 2012.
  30. Keynote lecture on “Role of geotechnical centrifuge modelling in advancing research and engineering design”. The 21st biennial National Congress on Soil Mechanics and Geotechnical Engineering of the Argentinan Geotechnical Society, Rosario, Argentina, 12-14 Sep. 2012.
  31. Special lecture on “What is static liquefaction failure of loose fill slopes?”. The 3rd International Conference on New Developments in Soil Mechanics and Geotechical Engineering, Near East University, Nocosia, North Cyprus, 28-30 Jun. 2012.
  32. AGM lecture on “Centrifuge and numerical investigation of pile performance subjected to stress relief due to deep excavation”. The 23rd Annual General Meeting (AGM) of the Geotechnical Engineering Technical Division of the Institution of Engineers, Kuala Lumpur, Malaysia, 9 Jun. 2012.
  33. Keynote lecture on “In-situ and laboratory investigation of water permeability function and SDSWCC of a saprolitic hillslope”. The 5th Asia-Pacific Conf. on Unsaturated Soils (TC6), Pattaya, Thailand, 29 Feb. – 2 Mar. 2012.
  34. Keynote lecture on “The theory and application of unsaturated soil mechanics in slope engineering”. The 9th Indonesian Geotechnical Conference, Jakarta, 7-8 Dec. 2011.
  35. Special lecture on “Mechanisms of liquefied flow and non-liquefied slide of loose fill slopes and stabilisation measures”. The 1st National Conference on Disaster Prevention and Mitigation Engineering, Nanjing, China, 22-23 Oct. 2011.
  36. Keynote lecture on “State-of-the-Art Geotechnical Centrifuge Modelling”. Chinese National Conference on Centrifuge Modelling, Wuhan University, China, 16-17 Oct. 2011.
  37. Special lecture on “Long-term settlement mechanisms of tunnels in Shanghai”. The 7th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground (TC28), Rome, Italy, 16-18 May 2011.
  38. Special lecture on “What is static liquefaction failure of loose fill slopes and its implications?” The 8th National Civil Engineering Forum for Graduate Sutdents (NCEFGS), Zhejiang Univervisty, 27-28 Nov. 2010.
  39. Keynote lecture on “Geotechnical centrifuge modeling in research and engineering practice”. The 4th International Conference in Geotechnical Engineering and Soil Mechanics, Iran, 2-3 Nov. 2010.
  40. General report/state-of-the-art report on “Geotechnical problems and case histories from the perspective of unsaturated soil mechanics”. The 5th International Conference on Unsaturated Soils (TC6), Barcelona, Spain, 6-8 Sep. 2010.
  41. Keynote lecture on “Theoretical and experimental study of very small strain anisotropic shear stiffness of an unsaturated decomposed soil”. The 4th Sino-Japan Geotechnical Symposium, Okinawa, Japan, 12-14 Apr. 2010.
  42. Taiwanese National Science Foundation invited touring lecture series in Kaohsiung and Taipei. 16-19 Dec. 2009.
  43. Keynote lecture on “The Mega South-North Water Transfer Project in China – Unsaturated Soil Mechanics Aspects”. The 4th Asia-Pacific Conf. on Unsaturated Soils (TC6), Newcastle, Australia, 23-25 Nov. 2009.
  44. Invited lecture on “What is Static Liquefaction Failure of Loose Fill Slopes?” The 1st Italian workshop on landslides, Naples, Italy, 8-10 Jun. 2009.
  45. Special lecture “Deformation and failure mechanisms of loose and dense fill slopes with and without soil nails”. The 10th International Symposium on Landslides and Engineered Slopes (JCT1). Xi’an, 30 June – 4 July, 2008.
  46. Co-chairman of the 6th International Sumposim on Geotechnical Aspects of Underground Construction in Soft Ground (TC28), Shanghai, 10-12 Apr. 2008.
  47. Keynote lecture on “Recompacted, natural and in-situ properties of unsaturated soils”. The 3rd International Conference on Site Characterization (TC16), Taipei, 1-4 Apr. 2008.
  48. Keynote lecture on “Centrifuge Modelling of Multiple Tunnel Interaction in Shallow Ground”. The 2nd International Symposium on Tunnelling for Urban Development, 14-15 December 2007, Pattaya, Thailand.
  49. Keynote lecture on “Liquefied flow and non-liquefied slide in loose fill slopes”. The 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Kolkata, India, 10-14 Dec. 2007.
  50. Keynote lecture on “Theoretical and experimental study of small-strain stiffness of decomposed geomaterials.” 10th National conference on SMGE, Chongqing, 1-4 Nov. 2007.
  51. Keynote lecture on “Anisotropic small-strain shear moduli of unsaturated completely decomposed tuff”. The 3rd Asian Conference on Unsaturated Soils (TC6), Nanjing, 21-23 Apr. 2007
  52. Invited lecture on “Small-strain stiffness of granitic and volcanic saprolites in Hong Kong”. The International Workshop on Natural Soil 2006, Singapore, Dec. 2006.
  53. Invited lecture on “The performance of large-diameter bored piles and large-section barrettes in decomposed geomaterials in Hong Kong”. The Korean Geotechnical Engineering Conference, Daegu, Korea, 27-28 Oct. 2006.
  54. Chairman of the Regional Organising Committee for the 6th International Conference on Physical Modelling in Geotechnics (TC2), Hong Kong, Aug. 2006.
  55. State-of-the-Art Panel Member on “Laboratory testing including soil-water characteristic curves”. The 4th International Conference on Unsaturated Soils (TC6), Phoenix, Arizona, USA, 2-5 Apr. 2006.
  56. Keynote lecture on “Centrifuge and numerical modelling of shielding effects on piles in consolidating soil”. The 2nd China-Japan Geotechnical Symposium, Shanghai, China, 15-16 Oct. 2005.
  57. General Reporter on “Excavations, Retaining structures and foundations”. The 16th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE), Osaka, Japan, 12-16 Sep. 2005.
  58. State-of-the-Art Lecture: “Unsaturated soil monitoring in field applications”. The 1st International Symposium on Advanced Experimental Unsaturated Soil Mechanics (TC6), 27-29 Jun. 2005, Trento, Italy.
  59. General Reporter on “Bored tunnels” for the 5th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground (TC28), Amsterdam, The Netherlands, 15-17 Jun. 2005.
  60. Keynote Lecturer on “Advanced Suction Control Techniques for Testing Unsaturated Soils”. The 2nd National Conference on Unsaturated Soils, Hangzhou, China, 23-24 Apr. 2005.
  61. General Reporter: “Applications to geotechnical structures”. The 2nd International Site Characterization Conference (TC16), Porto Portugal, 19-22 Sept. 2004.
  62. Invited lecturer on “Role of Geotechnical centrifuge modelling in advancing research and engineering design”. The 5th Young Geotechnical Engineers Conference, Taipei, 14-16 Jun. 2004.
  63. Keynote Lecturer on “Constitutive modelling of unsaturated loose soils for slopes subjected to rainfall infiltration”. The 9th China National Conference on Soil Mechanics and Geotechnical Engineering, Beijing, China, 26-29 Oct. 2003.
  64. General Reporter: “Integrated ground behaviour: predictions by numerical methods of physical model or field behaviour”. The 3rd International Symposium on Deformation Characteristics of Geomaterials (TC29), Lyon, France, 22-24 Sep. 2003.
  65. Theme Lecturer on “Applications of centrifuge modelling technology in geotechnical engineering practice”. The 12th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Singapore, 4-8 Aug. 2003.
  66. Keynote Lecturer on “An investigation into the use of soil nails in loose fill slopes”. First Chinese Symposium on Geoenvironment and Geosynthetics, Hangzhou, China, 17-19 Nov. 2002.
  67. Keynote Lecturer on “The potential use of soil nailing in stabilising loose fill slopes”. Cross-strait Conference on Water Resource and Slope Engineering, organised by the Taiwan Civil Engineering Association, Taipei, Taiwan, 8 Nov. 2002.
  68. General Reporter: “Deep excavation: design and analysis” at the 4th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground (TC28), Toulous, France, 23-25 Oct. 2002.
  69. Evaluation Reporter for the 3rd International Conference on Unsaturated Soils (TC6), Recife, Brazil, 12-14 Mar. 2002.