Abstract
An underground oil storage facility comprising six storage caverns is under construction in southern Korea. Each of the horseshoe-shaped caverns is 18 m wide, 30 m high, and 400–600 m long. The artificial water curtain system used consisted of water curtain tunnels and horizontal boreholes drilled from these tunnels, and pre-grouting measures have been introduced to keep the bedrock saturated all the time in order prevent oil from migrating through rock mass. The results of site investigation show that the bedrock at the site was very competent and impermeable and, hence, a suitable medium for the storage of oil. This conclusion was confirmed later by the results of design analysis, the revised instrumentation program, and hydraulic tests performed during construction. In general, design concepts for the excavation and support and water curtain system have been verified to be reasonably good in terms of the technical soundness and economy. The results of the revised instrumentation program indicate that the three-dimensional excavation behaviour is complex and should be studied in more detail.
Published Version
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