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Title: Analysis of data from instrumentation program, Columbia Lock
Authors: United States. Army. Corps of Engineers. Vicksburg District.
Sullivan, Albert L.
Keywords: Columbia Lock and Dam
Ouachita River
Pressure cells
Strain gages
Load distribution
Pile structures
Soil mechanics
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: Three monoliths at Columbia Lock were instrumented and monitored during and after construction, in order to determine the distribution of applied loads on the piles for comparison with predicted values. One of the monoliths was representative of the landside walls which support a backfill of compacted sand. One monolith was representative of the riverside walls which support no backfill. The instrumentation consisted of (A.) bonded electrical strain gages for measuring axial loads on the piles, (B.) earth pressure cells (landside monolith only) for measuring soil reaction, (C.) piezometers, and (D.) settlement plates and reference markers. Pressure cells indicated that the foundation soils carried only a small portion (approximately 5 percent) of the applied load. Practically all of the net applied load was carried by the foundation piles. For the landside monolith, the distribution of pile loads along each of the instrumented rows differed considerably from the planar distribution assumed for design. In general, the outer piles carried more load than the piles in the center. Analysis indicated that vertical drag forces resulting from settlement within the backfill had developed, accounting in part for the observed distribution of pile loads. A construction pile (Pile C), supporting Monolith 2R, was instrumented with 11 strain gages mounted along its length and on opposite sides of the web prior to construction of the monolith. This pile was instrumented and load tested in order to verify the test results from preconstruction pile load tests. Since this test pile was incorporated in the structure, it was decided to observe strains during and after lock construction. From the erratic nature of the observed data taken since construction, it appears that the pile was bent, either during the pile load test or in construction. Collection of data from this pile was discontinued in June 1972.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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