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- W52325192 abstract "During design of a 550-foot rectangular shaft in alluvium, lateral support within the excavation was an anticipated construction problem. Actual experience showed that the nearly 9 x 14 ft excavation required no lateral support. A strain measurement program concurrent with construction and for a 9-month period following completion of the shaft detected only minor strains. Shaft design included consideration of available geological information. Site exploration included a 754-ft drill hole, cored at selected intervals, and a suite of geophysical well logs. Generalized physical properties of the alluvium were developed from laboratory core testing. An elasto-plastic, finite element computer program (DAHLKE) developed by the Spokane Mining Research Center U.S. Bureau of Mines, has been recently used to analyze the behavior of the alluvium around the shaft. Analysis showed that yielding first develops in the shaft corners and progressively expands into the wall zones around the shaft as loading increases. Gradual growth of a plastic zone progressed outward from the excavation boundary at increasing loads but had limited extent and was surrounded at all stress levels by an infinite elastic zone. This design review, aided by computer analysis, confirmed that the shaft would have been considered theoretically stable as designed." @default.
- W52325192 created "2016-06-24" @default.
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- W52325192 date "1976-01-01" @default.
- W52325192 modified "2023-09-26" @default.
- W52325192 title "Design review of a rectangular shaft in alluvium. [Vertical shaft 9 x 14 ft; 550-ft deep]" @default.
- W52325192 hasPublicationYear "1976" @default.
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