Abstract
The paper deals with the stability of earth dams subjected to seismic and paraseismic excitations occurring in the close distance to the dam. The Newmark’s stability approach, classified as a simplified dynamic method, has been extended for two directional dynamic loading case and the evolution of the friction coefficient. The paper is focused on the experimental verification of the proposed method for harmonic and cyclic excitations generated by a simple oscillating device as well as by one-directional shaking table. Main assumptions of the proposed method have been proved and the effect of the vertical acceleration on the stability of the dam has been demonstrated. In the experiments conducted under cyclic loading, the impact of the vertical acceleration on the permanent displacement of the block was equal to 57 %. However, in general, the exact magnitude of this impact depends on many factors, such as the vertical to horizontal peak ground acceleration ratio or frequency range of the vertical component of the earthquake.
Highlights
The paper is focused on the evaluation of stability of earth dams subjected to seismic and paraseismic excitations
Newmark has assumed real-time histories of the acceleration as dynamic loading model and the stability criterion expressed in terms of permanent displacement D of the soil cumulated during an earthquake
The results presented have been obtained for platform inclination of 9.93° and interface type 60 subjected to two-directional dynamic loading generated for device settings U3f3
Summary
The paper is focused on the evaluation of stability of earth dams subjected to seismic and paraseismic excitations. General guidelines and review of methods commonly used for stability assessment of an earth dam subjected to dynamic loading coming from natural earthquakes or induced by mining tremors can be found in [1,2,3,4]. The Newmark’s stability approach, classified as a simplified dynamic method, has been considered as the most appropriate method for examining the assumed hypothesis. The permanent displacement approach, proposed by Newmark in 1965, is still widely used due to its simplicity and intuitive measure of slope stability [5]. Newmark has assumed real-time histories of the acceleration as dynamic loading model and the stability criterion expressed in terms of permanent displacement D of the soil cumulated during an earthquake. Numerical and experimental results are compared, followed by the main conclusions
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