Model Deep Cement Mixing Specification for Hong Kong
Reclamation outside Victoria Harbour is one of the multi-pronged approaches of increasing land supply in Hong Kong and tops the agenda of the current-term Government of HKSAR in order to build up a land reserve in the long run to solve the housing problem. The Government has been proactively pressing forward studies for such new reclamation projects as in Lung Kwu Tan and Ma Liu Shui, in addition to those for Kai Yi Chau Artificial Islands and North Lantau. This calls for cost-effective planning, design and construction practices of reclamation works in Hong Kong in order to expedite land production in meeting the vision set in the Hong Kong 2030+. The Geotechnical Engineering Office (GEO) of the Civil Engineering and Development Department (CEDD) has taken steps to work hand in hand with practitioners, academia and relevant government departments to consolidate the experience gained from the recent reclamation projects in the territory to enhance the design and construction practices. Focus has been put not only on enhancing the quantity, speed, efficiency and quality of reclamation works, but also promoting the adoption of the latest smart technologies and green construction materials to set a new norm for sustainable development. The first deliverable is the model specification for deep cement mixing (DCM), a prevailing ground improvement technique used in non-dredged reclamation. This paper discusses the rationales and considerations behind the enhancements on the DCM construction specification that could benefit future reclamation projects, and moreover, the planning of and actions taken by the GEO in developing a state-of-the-art while practical local design and construction guide for different reclamation methods and ground improvement techniques.
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