ISSN:
1570-1468
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Conclusions 1. An analysis of data of previous and additional full-scale investigations of the static behavior of lock chamber walls with solid bottoms on nonrock foundations showed that the reaction pressure of sand backfills not only increases gradually during the first years of operation but also changes considerably (as much as 1.6 times) during the navigation season, increasing with an increase of air temperature. It was found that the deflections of the walls during filling and emptying increased during the season by a factor of 1.5–2 under the same external loads and effects, which was due to a decrease in the deformative properties of the sand backfill during the navigation season as a consequence of rupture of the internal structural bonds during repeated locking. Accordingly, the stresses in the reinforced-concrete chamber structures, particularly in the reinforcement, changed with time. 2. The most severe conditions of the static behavior of the elements of the lock chambers with solid bottoms were created: a) in the emptied and dried chamber after a number of years of operation, in the second half of the navigation season, and after the hottest summer period, when backfill pressure reaches a maximum at a value of kel of the sand backfill up to 1.5 kg/cm3; b) in the filled chamber in the initial period of operation and start of the navigation season, when the backfill pressure is a minimum and the reaction component of the earth pressure is small at a value of kel of the sand backfill to 0.5 kg/cm3. 3. The difference in stresses in the lock chamber elements in the aforementioned cases is actually greater than that obtained by the calculation methods used. This confirms the relatively greater economy of schemes of medium- and high-head lock chambers with incomplete backfilling of the walls, which are presently finding greater popularity. 4. The conclusions obtained from an analysis of the full-scale investigations of the static behavior of structures of chambers with solid bottoms should be taken into account when designing not only chambers for ship locks but also similar structures, particularly dry docks, single-sluice spillways, and settling tanks.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02376746
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