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Parametric study of the earth dam's behaviour subjected to earthquake

Ayeche H., Zitouni Z., Limam A., Bouafia A.

Studia Geotechnica et Mechanica

2022

Vol. 44, nr 4

267--281

Static stability of an earth dam can be established by estimating the static safety factor equal to the ratio of the shear strength to the shear stress along a critical sliding area. In contrast, it is more complicated to evaluate the dynamic stability during an earthquake. The water filling the interstices of the earth dams cannot drain during the short duration of an earthquake. An excess pore water pressure DU develops, and its role is predominant in the destabilisation of the dam. The pore water increase causes a decrease in the soil shear strength. It is, therefore, crucial to evaluate and take into consideration DU in the dam dynamic stability analysis. This research is a contribution to reach this objective. A parametric study was conducted by varying the physical and mechanical soil characteristics constituting the dam, as well as its geometrical values, in order to evaluate their effects on the dynamic safety factor. The dynamic safety factor is calculated using the pseudo-static method, taking into account the excess pore water pressure that develops during cyclic loading into the granular soil of the earth dam upstream face. The results of the parametrical analytical study were also compared to the results of numerical simulations of the dam seismic stability trough pseudo-static method. The numerical simulations were done with three different software: PLAXIS and ABAQUS (based on the finite element method) and GEOSTAB (deals with the problem at the limit equilibrium using the simplified Bishop method). At the end, on one hand, we were able to describe how and at what level of the dam upstream face the sliding occurs, and on the other hand, we were able to underline the adequate combination between the dam geometric parameters and the mechanical soil characteristics which may ensure seismic stability.

Nowe wykorzystanie metody blokowej w konstrukcji algorytmów heurystycznych dla ogólnego problemu przepływowego

Grabowski J., Pempera J.

Zeszyty Naukowe. Automatyka / Politechnika Śląska

2008

z. 150

45-50

Własności blokowe są z powodzeniem stosowane do usuwania ruchów nierokujących poprawy dla wielu otoczeń stosowanych w algorytmach popraw dla problemów szeregowania. W pracy, dla ogólnego problemu przepływowego, zaproponowano nowy sposób przeglądania otoczenia, który pozwala na eliminację znacznie większego zbioru ruchów. W celu sprawdzenia efektywności metody przeprowadzono eksperyment komputerowy na instancjach Taillarda.

The block properties are successfully applied to a priory eliminate non promising moves from the neighborhood for many local search algorithm of solving scheduling problems. In this paper, for the general flowshop problem, it presents new method of searching the neighborhood, which gives rise to eliminate highly greater set of moves. To validate efficiency of the proposed method, computational experiment have been executed on a well-known Taillard's benchmarks.