Development of Three-Dimensional Geotechnical Models for Territorial and Infrastructural Development in Hong Kong

Abstract

With an aim to support the Smart City Blueprint for Hong Kong, the Geotechnical Engineering Office (GEO) of Civil Engineering and Development Department (CEDD) has been taking a steering role in developing 3D geotechnical models (3DGM) for supporting territorial and infrastructural development in Hong Kong. In parallel to the recent revamp of the centralised data repository Geotechnical Information Infrastructure into a three-dimensional mapping system (namely 3DGInfo), the GEO has initiated a pilot study to develop territory-wide 3DGM utilising existing ground investigation (GI) records collected from public and private projects. Unlike conventional geological maps, the 3DGM is designed for practical engineering applications, such as giving reference to the optimal foundation depths for various types of deep foundations. By providing detailed insights into subsurface conditions, the 3DGM enables planners and engineers to efficiently assess site-specific geology and streamline decision-making during the early stages of development projects. A customised workflow was proved successful in generating 3DGM blocks in Wan Chai, Tung Chung East reclaimed land and a marble site in Yuen Long. Riding on the success of the pilot study, the GEO is working to further enhance the 3DGM generation methodology using state-of-the-art technologies and has prioritised a new phase of 3DGM block creation in the Northern Metropolis Development areas. This paper discusses the innovative solutions adopted and the GEO’s vision and roadmap for developing territory-wide 3DGM to enhance GEO services and benefit practitioners.