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  Support Design for the Largest Cavern in Hong Kong and Thoughts on Improved Design and Construction Approaches for Future Large Caverns

  Tseung Kwan O – Lam Tin Tunnel project comprises 2.22 km dual two-lane road tunnels developed to improve connectivity of Central and Eastern Kowloon Area in Hong Kong. For most of the alignment length, the average excavation span of the main tunnels is about 16 m. In one location however, there is a bifurcation where one of the main tunnel drives branches off to the Eastern Harbour Crossing, (EHC), about 200 m below ground level. Due to the complex geometry of the permanent structure, in this location the eventual excavation design and construction approach became the largest single span cavern ever constructed in Hong Kong (34 m). This paper presents the design and construction methodology for the cavern, and with the benefit of hindsight now that the cavern has been successfully constructed reflects on alternative approaches to the design and construction for consideration in future large cavern projects in Hong Kong.

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