Synopsis

In Dec 2023, Geotechnical Engineering Office issued GEOPublication No. 1/2023 – Deep Excavation Design and Construction. It documented the experience gained, and advances in design and construction of deep excavations in Hong Kong since the publication of GCO 1/90. Recommendations given aim to achieve economic excavation and lateral support (ELS) works design, construction time saving, and ground deformation monitoring and control enhancements.

The ELS design for an ongoing project at Kwai Chung implementing the recommendations of GEO Publication No. 1/2023 was recently approved by the Buildings Department. This talk will present experience gained in the approval progress and cover two major aspects in the design: the revamped 5A monitoring scheme, and the design assumptions of ground water levels (GWL). Compared with the traditional 3A monitoring scheme with maximum 25mm settlement limit, the proposed 5A monitoring scheme on trigger level determination is more rational with excavation depth considered. Specific and targeted response actions concerning the values exceedance are also summarized.

The talk will further discuss lessons learned from construction issues such as the water leakage of ELS cofferdam and dropping of pre-loading force in strut. Safety issues and mitigation measures to minimize the effects of such risks will be presented.

About the Speaker

Gavin came to Hong Kong in 1993 after completing his BEng (Hons) in 1988 and PhD in Civil Engineering in 1992 at The University of Western Australia. He has 30 years of experience in design and construction of foundation and underground geotechnical works. He is currently a Deputy General Manager of Lambeth Associates Ltd. Lambeth is an in-house engineering consultancy of Gammon, where he has worked for over 27 years. He is currently responsible in managing the Foundation and Geotechnical Team to provide safe, economical, and innovative geotechnical engineering solutions for a variety of civil, railways, tunnels, and buildings projects in Hong Kong. He is actively serving in professional bodies such as HK Institution of Engineers (HKIE), and Institution of Civil Engineers (ICE). He is currently the Immediate Past Chairman of the HKIE Geotechnical Division. He has served as ICE CPR Reviewers for 10 years, and currently member of the ICE Professional Review Panel. He is a Registered Geotechnical Engineer (RGE), and Registered Structural Engineer (RSE).

Fee :

Free of charge

Registration :

Please register by 19:00 on 20 Dec 2024 (HKT). Successful applicants will receive webinar details after registration. CPD certificate will be sent to theattendees, who attended more than 80% of the webinar time, within 2 weeks after the webinar.

Book Prize :

Professionals under 35 years of age are encouraged to submit a Book Prize Report (max. 500 words) on webinars and site visits arranged by AGS (HK).

Contributors to successful Book Prize Reports will be awarded a Book Prize that comprises of a book "Geology of Site Investigation Boreholes in Hong Kong" written by Chris Fletcher, and a coupon of HK$500 for Eslite Spectrum (誠品生活) or equivalent. The successful Book Prize Report will also be published on the AGS (HK) website to showcase your accomplishment.

Prior to report submission, please refer to the “The AGS Book Prize Reports – Assessment Framework”* on the AGS (HK) website. You may submit your Book Prize Report to our assessors by uploading the report file through the AGS (HK) website at https://www.ags-hk.org/book-prize. Should you have any questions, please contact us at agshk@meinhardt.com.hk.

*Link to the AGS Book Prize Reports – Assessment Framework:

https://www.ags-hk.org/_files/ugd/521a4c_b94496034732484687441cf4ed4d0bf9.pdf