Filtration stability of soil bridges of dams as temporary hydraulic structures

Study of the influence of design and technological solutions for the construction of bulkheads of shipping hydraulic structures on filtration processes and the stability of the embankment of the dam core under operational impacts. The research method is a numerical modeling of the processes and analytical research methods made it possible to obtain the results of the set goal.

As a result of studying the influence of design and technological solutions for the construction of bulkheads, as temporary shipping hydraulic structures, on filtration processes and the stability of the embankment of the dam core under operational impacts, the following were completed: analysis of design and technological solutions for the construction of bulkheads of shipping hydraulic structures; analysis of the methods of blocking the river bed, as processes of gradual compression of the flow until the appearance of flow velocities that wash away the river bed and the backfill material. Criteria were identified that ensure the filtration strength of the soil for backfilling the core of the earth dam. A study was conducted of the potential destruction of the bulkhead when calculating for the main combination of loads using numerical modeling. Analysis of the filtration stability of the bulkhead using the finite element method under dynamic impacts has been carried out. Proposals have been developed to prevent the accumulation of filtered water through the bulkhead body. The filtration stability of the soil bulkhead as a temporary hydraulic structure is ensured by the current pressure gradient at the contact of two soils, which is significantly less than the permissible gradient, i.e., there is no erosion. The obtained results of numerical modeling allow us to observe a more accurate mechanism for the destruction of dam bulkheads. It is possible to carry out work on replacing the repair gates of the sluice under the protection of the soil bulkhead only in compliance with the requirements of regulatory and technical documentation and performing the necessary calculations.

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