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IOM3 Half-day Seminar

UNDERSTANDING GROUND MOVEMENTS DUE TO EXCAVATIONS

Theme This half-day seminar aims to provide an understanding of ground movements that can occur due to different types of excavation and ground supports. Three eminent speakers will share their knowledge and experience in aspects of tunnelling and deep excavation induced ground movements, making extensive use of case histories. The presentations will cover ground movements due to tunnel excavation, deep excavation with traditional Excavation and Lateral Support, and deep excavation with soil nail support. Time 21 November 2015 (Saturday), 9:00 am to 12:00 pm Location Room Y305, Polytechnic University of Hong Kong (see the attached map) Registration Admission is FREE. However, the venue has a capacity of approximately 120 people. Hence, prior registration is required. Space will be reserved on a first-come first-served basis. Please provide the following information to Billy.Siu@aecom.com for registration:

Name Contact phone number E-mail address Affiliation

Enquiries For enquiries related to the seminar, please contact Guy Bridges (tel: 3922 8887 or e-mail: Guy.Bridges@aecom.com). Remarks Half a day CPD (3 hours) will be provided to attendees. Registration will be held at the beginning of the event with attendance certificates provided at the end.

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Programme

Time Topic Speakers

9:00 to 9:15 am Registration

9:15 to 9:30 am The importance of understanding ground movements due to excavations.

Ir. Guy Bridges (IOM3(HK) President)

9:30 to 10:00 am Investigating the effect of tunnelling on existing tunnels.

Dr. Jamie Standing (Imperial College, London)

10:00 to 10:30 am Coffee break

10:30 to 11:00 am Ground movement associated with deep excavations in Hong Kong

Dr. Victor Li (Victor Li and Associates)

11:00 to 11:30 am Monitoring for the design and construction of deep excavations and tunnels

Ir. Leslie Swann (Jacobs China Ltd.)

11:30 to 12:00 pm Q & A section

12:00 pm Event closes

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Speaker Biographies: Ir. Guy Bridges is qualified as a Mining Geologist, and has been involved in the design and construction of tunnels and geotechnical works for major road, rail and drainage projects in Hong Kong, Singapore and the UK. He has particular expertise in tunnel design and construction, both hard rock and soft ground, by methods including drill and blast, TBM, and mechanical excavation. His practical experience includes several years on site as a NATM engineer, installing and taking readings of instruments measuring ground movements due to tunnel excavation. Dr. Jamie Standing is Reader in Ground Engineering in the Department of Civil and Environmental Engineering at Imperial College London. His main research interests are in the areas of soil-structure interaction (tunnels, deep excavations, piles, soil nails), field monitoring, small-scale modelling, unsaturated soil mechanics and laboratory testing of soils. He has run major tunnelling research projects associated with: Jubilee Line Extension (greenfield sites and numerous building interactions); CTRL (effect of tunnelling on piled foundations) and Crossrail (effect on existing cast iron lined tunnels). Dr. Victor Li is Director of Victor Li & Associates Ltd. and Centre for Research & Professional Development. He is formerly Chairman of the HKIE Geotechnical Division and Building Division, Chairman of the Association of Geotechnical and Geo-environmental Specialists, Chairman of the Geotechnical Engineers Registration Committee and a member of the Technical Committee on Code of Practice for Foundations. He actively promotes innovative designs in geotechnical engineering and has published over 200 technical papers in various fields of civil engineering. Ir. Leslie Swann is a highly qualified, geotechnical engineer with over 40 years’ experience in geotechnical works, foundation analysis, groundwater assessment and ground improvement. He has been involved in developing alternative designs as part of value engineering exercises for highway and railway projects and has provided expert advice in construction disputes. As a Registered Geotechnical Engineer he is also familiar with the statutory requirements for geotechnical engineers in Hong Kong. He is a Director of Jacobs China Limited responsible for the geotechnical work of the Hong Kong office.

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Talk Synopses: Ir. Guy Bridges will be presenting on: Modelling of ground movements has been developed to a high level, but there are many factors that may affect the actual ground movement, sometimes with catastrophic results. In order to avoid such situations, it is important that adequate measurements are taken on site, and these are carefully studied to ensure that the ground is behaving in the expected manner. Some examples will be provided to highlight the importance of understanding the ground behaviour and movements due to excavations. Dr. Jamie Standing will be presenting on: Urban expansion throughout the world has resulted in the need for many new tunnelling projects to provide adequate infrastructure for increasing urban populations. Many cities already have comprehensive underground networks and so new tunnels have to be constructed in the close proximity of existing tunnels. There is always concern that ground deformations associated with new tunnel construction might adversely affect nearby existing tunnels. In London the recently constructed Crossrail tunnels passed beneath numerous existing tunnels. Imperial College London, working closely with Crossrail, undertook major research to investigate the effect of tunnelling on existing tunnels using an interactive five path approach involving field monitoring, structural and soil testing and numerical analysis. These elements of the research will be described and some of the key findings summarised. Dr. Victor Li will be presenting on: The design of deep excavations in urban areas in Hong Kong is usually governed by the need to control the calculable settlement to a small limit. For this reason, the settlement attributed to wall deflection of the cofferdam is usually small and generally well below the predicted values. Ground movements associated with deep excavations in Hong Kong usually arise from situations which have been overlooked or not considered during the design stage. Case studies will be discussed in the presentation to show some examples of ground movement for deep excavations. Ir. Leslie Swann will be presenting on: The design of deep excavation and tunnels necessarily rely on certain assumptions as the variability of ground conditions can never be certain in advance of construction. Therefore in order to validate assumptions monitoring is an essential requirement for geotechnical works. The presentation will explain how monitoring was used in the design and construction of the deep excavation at Ho Man Tin station to validate the design of the first use of GFRP soil nails in Hong Kong in an area of complex geology. Furthermore it will discuss how monitoring can be used in the design of tunnel support when unexpected ground conditions are encountered.

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Location Map