Abstract
This paper will present the geological and engineering considerations in the planning, design and construction of a public library cum an indoor recreation centre in cavernous karst area at Tin Shui Wai, Hong Kong. An appraisal was carried out to determine the effect of geological consttraints on the foundation design and to assess the suitability of difffferent types of foundation systems. Sinkhole hazard is a major challenge to engineers when founding a structure and/or carrying out excavation in cavernous karst area. Formation of a sinkhole usually leads to a sudden depression on the ground surface caused by the collapse of cavities. This paper will describe how the most appropriate foundation system was chosen and how the sinkhole hazard was investigated and/or dealt with at the planning, design and construction stages, especially the experience in using cross-hole seismic tomography to delineate the spatial extent of cavities within the karst area. Moreover, in Hong Kong, although rock-socketted steel H-piiles and large diameter bored piles have widely been employed as foundation, limited local experience and design parameters have been published for the piles installed in cavernous karst area. This paper will discuss the allowable shaft friction between marble and concrete pile at the socket section being adopted in this project.
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