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Palmaz Winery Fermentation Dome
00Location: Napa, California
00Owner: Amalia Palmaz Winery
00Client: Glen Ragsdale Underground Associates
00This project involved the design and construction sequencing of a 50-foot high by 75-foot wide wine cave. The cave was constructed as a dome in lahar that consisted of fresh andesite boulders in a matrix of highly weathered rhyolite. Cover over the dome is sloping and relatively shallow, with an average cover of approximately 45 feet. Jacobs Associates' design included construction sequencing and ground support details using construction aspects of the New Austrian Tunneling Method (NATM). Ground support for the dome consisted of 16-foot long, 1-inch diameter steel threadbar rock dowels and a shotcrete lining reinforced with welded wire fabric.
00Jacobs Associates was also responsible for geotechnical characterization, which consisted of examination and mapping of existing pilot tunnels and surface outcrops, observation of percussive drilling at the ground surface, and laboratory testing of rock materials taken from within the pilot tunnels. An instrumentation and monitoring program was implemented to measure ground and tunnel lining displacements. Both Multiple Point Borehole Extensometers and lining convergence measurements were utilized.
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