Instrumentation Observations from the U-Frame Lock of the Arkansas River Lock and Dam 5.

摘要

Arkansas River Lock and Dam 5 is a U-frame lock coupled with a nonnavigable dam located between Pine Bluff and Little Rock, Arkansas, at river mile 128. The object of the study is the U-frame lock. The lock is a reinforced concrete structure with a 110- by 600-ft chamber. Previous U-frames have been instrumented, but Lock 5 provided a test case for a lock structure founded on Tertiary-age clay. The instrumentation was provided to determine the validity of design assumptions and to use in design of similar structures. From the data, earth and hydrostatic pressures were calculated beneath the base slab and along the walls, while the stresses and strains within the slab and walls were also obtained. Overall, it appears the instruments were operating satisfactorily until September 1969 at which point a reduction in personnel precluded acceptable engineering measurements. Considerable judgment must be exercised when interpreting data collected after this point in time. A set of conditions, as specified in the design cases, had occurred before the September 1969 date, and only the dewatered case and possibly a more accurate normal operating case require data for analysis. Based on the soil stresses under the lock, it appears that the stress curves are similar in shape to the ones plotted for Old River and Port Allen with large stresses under the lock walls and much less under the lock floor. Concrete strains and stresses are shown for the design cases chosen for the soil stress cases. No attempt is made in this report to analyze the structural response.