Sluice Pressures,Gate Vibrations,and Stilling Basin Wall Pressures, Libby Dam, Kootenai River,Montana.

摘要

Two of the three Libby Dam sluices suffered cavitation damage after a short period of operation. During this period of operation, extreme noise was heard and structural movement suspected. Prototype studies were conducted to monitor the sluice pressure fluctuation amplitudes and frequencies as well as sluice gate and structural vibrations. In addition, stilling basin wall pressures were measured during spillway releases. The sluice pressure measurements indicated that negative pressure fluctuations occurred at all points of measurement along the invert (at all gate openings) and that vapor pressure was approached or occurred at three of these locations during certain gate openings. Structural vibrations were generally insignificant whereas the sluice gate was subjected to significant vibrations in all three directions. The mean pressures measured on the stilling basin wall were lower in the upstream, lower portion of the wall and vapor pressure was approached in the upstream lower corner. (Author)