The half-day CPD course will be delivered on the web using Zoom.

Dissemination of experience is extremely important for the healthy development of the engineering profession. Therefore, a series of "Lessons Learnt" Web-CPD courses is launched so as to disseminate experience we gained in some past construction projects in Hong Kong and mainland China. The 2nd course is on lessons learnt from large-scale underground construction projects.

Large-scale underground construction works are often required to cope with the rapid development of Hong Kong. These works may include construction of large-scale substructures such as MTR stations, deep basements, caverns and tunnels. The complexity of the project is significantly increased by the scale of works. Handling and effective management of a site of area of 1,000 m² site is completely different from that of a site of area of 100,000 m². In some cases, even the land formation or slope cutting works are being carried out simultaneously within the same site when a deep excavation is in operation.

Many engineers may be familiar with the concepts and design of the final large-scale subsurface works. However, there are many important practical considerations in the successful completion of large-scale underground construction, in particular the construction sequence and the logistic support behind. These practical considerations are often overlooked in the design office. However, they would make significant differences in the planning and execution of such projects from the viewpoints of both the engineer and the contractor. More importantly, proper considerations of these practical aspects are decisive factors for the success of these projects in terms of quality, time and cost.

There are many site-specific constraints have to be coped with and site-specific problems have to be solved when they are identified during construction. These site specific constraints and problems may include geotechnical conditions, topographical conditions, shape and location, etc. of the particular site, and existence of nearby sensitive structures, underground utilities, and/or recipients.

In this half-day Web-CPD course, the practical considerations in large-scale underground construction will be presented with real-life examples. Lessons learnt from these challenging projects: (1) Hong Kong West Kowloon Station of the Guangzhou-Shenzhen-Hong Kong Express Rail Link; (2) One International Financial Centre; (3) Two International Finance Centre; and (4) the entire CBD zone of Guangzhou are presented as illustrations.

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