Channel Tunnel, Texas Style

dc.acquisition-srcDownloaded from-Water Resources Abstractsen_US
dc.call-noen_US
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dc.contributor.authorIvor-Smith Den_US
dc.contributor.authorNandagiri Sen_US
dc.contributor.otherCivil Engineering (ASCE) CEWRA9 Vol 59, No 12, p 40-43, December 1989 4 figen_US
dc.date.accessioned2010-02-15T17:15:32Z
dc.date.available2010-02-15T17:15:32Z
dc.date.issued1989 Decen_US
dc.degreeen_US
dc.descriptionNo-43en_US
dc.description-otheren_US
dc.description.abstractTwo tunnels are being constructed in soft ground beneath the Houston Ship Channel and Greens Bayou as part of the Houston area 's water delivery system. When completed the tunnels will convey 320 million gal.day of raw water to one of Houston 's water purification plants. The initial tunnel specifications emphasized the minimization of risks to lower costs either through the initial bid or as a result of claim mitigation. Seismic investigations helped delineate clay zones and showed the need to place the tunnels deeper. Pipeline depth and cost considerations dictated a primary lining of bolted steel segments with a 10 ft, 2 inch diameter to provide the necessary clearance for the 108 inch steel carrier pipe. Deflection studies of linear deformation caused by ground stress showed that overstress was not occurring and the values obtained came in close agreement with the 0.5 inch design criteria. Shafts were constructed using circular concrete caissons sunk from sheetpile and ring wale starter pits. The measured heave resulting from deep excavations ranged between 1.7 inches and 2.2 inches, indicating that the ground and tunnels were behaving as expected. A 133 inch diameter Lovat TBM, which features the ability to convert to an earth pressure balance shield when necessary, was used for the deep tunnel drives. Since the TBM was designed with a stroke allowing simultaneous erection of two 2 ft. wide rings, it was possible to reduce ring erection time considerably by prebolting adjacent segments of two rings at the fabricator shop. Advance rates averaged 30 ft per 12 hour shift, with a maximum of 64 ft in a single shift. Tunneling is expected to continue into 1990, with the deep Greens Bayou tunnel being the last drive to be completed. (Male-PTT)en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/23224
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dc.notesen_US
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dc.relation.ispartofseries50802.00en_US
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dc.scaleen_US
dc.seriesen_US
dc.subjectCost analysisen_US
dc.subjectDesign criteriaen_US
dc.subjectExcavationen_US
dc.subjectGreens Bayouen_US
dc.subjectHouston Ship Channel Tunnelen_US
dc.subjectPipesen_US
dc.subjectSedimentsen_US
dc.subjectSW 6010 Structuresen_US
dc.subjectSW 6080 Rapid excavationen_US
dc.subjectTunnel constructionen_US
dc.subjectWater deliveryen_US
dc.subjectWater transporten_US
dc.titleChannel Tunnel, Texas Styleen_US
dc.typeJournalen_US
dc.universityen_US
dc.vol-issue()en_US

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